MODEL 97074-1
owner’s manual
introduction
3
BEFORE YOU
PROCEED
4
SAFETY
PRECAUTIONS
7
TOOLS, SUPPLIES,
AND REQUIRED
EQUIPMENT
8
MODEL OVERVIEW
9
QUICK START:
GETTING UP
TO SPEED
10 TRAXXAS TQ
RADIO SYSTEM
16 ECM-2.5 ELECTRONIC
CONTROL MODULE
17 DRIVING YOUR MODEL
19 TUNING
ADJUSTMENTS
21 MAINTAINING
YOUR MODEL
Thank you for purchasing the Traxxas TRX-4M™ with the Ford
Bronco Body. This officially licensed model gets the full Traxxas
treatment with unsurpassed realism, including molded Broncoemblazoned grille, door handles, and side mirrors. The design of
the TRX-4M offers a new way to experience all the fun, adventure,
and scale realism of the TRX-4 in a 1/18 platform. Oil-filled shocks
control body motion and provide smooth suspension travel over
any terrain. Steel frame rails and a smooth running drivetrain give it
true outdoor capability over rocks and through grass and streams.
The tight turning radius and precise throttle control give it fantastic
indoor maneuverability. Your new RC model offers the highest level
of innovation, performance, and quality that is the hallmark of all
Traxxas vehicles.
This manual contains the instructions you will need to operate and
maintain your model so that you can enjoy it for years to come. We
want you to feel confident that you own one of the best-performing
models in the market and that it is backed by a team of professionals
who aim to provide the highest level of factory support possible.
Traxxas models are about experiencing total performance and
satisfaction, not just with your model, but also with the company
that stands behind it.
We know you’re excited about getting your new model on the trail,
but it’s very important that you take some time to read through the
Owner’s Manual. This manual contains all the necessary setup and
operating procedures that allow you to unlock the performance
and potential that Traxxas engineers designed into your model.
Traxxas Support
Traxxas support is with you every step of the
way. Refer to the next page to find out how to
contact us and what your support options are.
Quick Start
This manual is designed with a Quick
Start path that outlines the necessary
procedures to get your model up
and running in the shortest time possible. If you are an
experienced RC enthusiast, you will find it helpful and fast.
Be sure and read through the rest of the manual to learn
about important safety, maintenance, and adjustment
procedures. Turn to page 10 to begin.
Even if you are an experienced RC enthusiast, it’s important to
read and follow the procedures in this manual.
Thank you again for going with Traxxas. We work hard every day
to assure you the highest level of customer satisfaction possible.
We truly want you to enjoy your new model!
REGISTERING YOUR MODEL
In order to serve you better as our customer, please
register your product within 10 days of your purchase
online at Traxxas.com/register.
Traxxas.com/register
FCC Compliance
This device contains a module that complies with the limits for a Class B digital device as described in part 15 of the FCC rules. Operation is subject to the following two conditions: (1) This
device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
The limits for a Class B digital device are designed to provide reasonable protection against harmful interference in residential settings. This product generates, uses and can radiate radio
frequency energy, and, if not operated in accordance with the instructions, may cause harmful interference to radio communications. The user is cautioned that changes or modifications
not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.
Canada, Industry Canada (IC)
This Class B digital apparatus complies with Canadian ICES-003 and RSS-210. This device complies with Industry Canada license exempt RSS standard(s). Operation is subject to the
following two conditions: This device may not cause interference, and This device must accept any interference, including interference that may cause undesired operation of the device.
2 • TRX-4M
Radio Frequency (RF) Exposure Statement
This equipment complies with radio frequency exposure limits set forth by FCC and Industry Canada for an uncontrolled environment. This equipment should be installed and
operated with a minimum distance of 20 centimeters between the radiator and your body or bystanders and must not be co-located or operating in conjunction with any other
antenna or transmitter.
Operation Frequency: 2406~2453 MHz
Maximum Radio Frequency Power: Maximum Peak Power -1 dBm
before you proceed
Carefully read and follow all instructions in this and any
accompanying materials to prevent serious damage to your
model. Failure to follow these instructions will be considered
abuse and/or neglect.
SUPPORT
Before running your model, look over this entire manual and
examine the model carefully. If for some reason you decide it is not
what you wanted, then do not continue any further. Your hobby
dealer absolutely cannot accept a model for return or exchange
after it has been run.
Technical support is available 7 days a week from 8:30am to 9:00pm
central time. Technical assistance is also available at Traxxas.
com. You may also e-mail customer support with your question at
[email protected]. Join thousands of registered members in our
online community at Traxxas.com.
Warnings, Helpful Hints, & Cross-References
Throughout this manual, you’ll notice warnings and helpful hints
identified by the icons below. Be sure to read them!
Traxxas offers a full-service, on-site repair facility to handle any
of your Traxxas service needs. Maintenance and replacement
parts may be purchased directly from Traxxas by phone or online
at Traxxas.com. You can save time, along with shipping and handling
costs, by purchasing replacement parts from your local dealer.
An important warning about personal safety or avoiding
damage to your model and related components.
Special advice from Traxxas to make things easier
and more fun.
Refers you to a page with a related topic.
If you have any questions about your model or its operation,
call the Traxxas Technical Support Line toll-free at:
1-888-TRAXXAS (1-888-872-9927)*
Do not hesitate to contact us with any of your product support needs.
We want you to be thoroughly satisfied with your new model!
Traxxas
6250 Traxxas Way
McKinney, Texas 75070
Phone: 972-549-3000
Toll-free 1-888-TRAXXAS
Internet
Traxxas.com
E-mail:
[email protected]
Entire contents ©2022 Traxxas.
All rights reserved. Traxxas,
Ready-To-Drive, TQ, Titan, TRX-4M,
and ECM-2.5 are trademarks or
registered trademarks of Traxxas.
Other brand names and marks are
the property of their respective
holders and are used only for
purposes of identification. No part
of this manual may be reproduced
or distributed in print or electronic
media without the express
written permission of Traxxas.
Specifications are subject to change
without notice.
Ford Motor Company Trademarks
and Trade Dress used under license
to Traxxas.
Ford® and Bronco® are trademarks
of Ford Motor Company.
All copyrights and trademarks are
used by Traxxas under license.
*Toll-free support is available to U.S. residents only.
TRX-4M • 3
safety precautions
All instructions and
precautions outlined in this
manual should be strictly
followed to ensure safe
operation of your model.
This model is not intended
for use by children under
18 years of age without the
supervision of a responsible
and knowledgeable adult.
No previous experience
with radio controlled
models is required.
Models require a minimum
of setup, maintenance, or
support equipment.
1
4 • TRX-4M
All of us at Traxxas want you to safely enjoy your new model. Operate
your model sensibly and with care, and it will be exciting, safe, and fun
for you and those around you. Failure to operate your model in a safe and
responsible manner may result in property damage and serious injury.
The precautions outlined in this manual should be strictly followed to
help ensure safe operation. You alone must see that the instructions are
followed and the precautions are adhered to.
Important Points to Remember
• Your model is not intended for use on public roads or congested areas
where its operation can conflict with or disrupt pedestrian or vehicular
traffic.
• Never, under any circumstances, operate the model in crowds of people.
Your model may present a tripping hazard and could cause injury.
• Because your model is controlled by radio, it is subject to radio
interference from many sources that are beyond your control. Since
radio interference can cause momentary losses of radio control, always
allow a safety margin in all directions around the model in order to
prevent collisions.
• The motor can become hot during use. Be careful to avoid getting
burned.
• Don’t operate your model at night, or anytime your line of sight to the
model may be obstructed or impaired in any way.
Electronic Control Module (ECM)
Your model’s electronic control module (ECM) is an extremely powerful
electronic device capable of delivering high current. Please closely follow
these precautions to prevent damage to the ECM or other components.
• Disconnect the Battery: Always disconnect the battery from the ECM
when not in use.
• Insulate the Wires: Always insulate exposed wiring with heat shrink
tubing to prevent short circuits.
• Transmitter on First: Switch on your transmitter first before connecting
the battery to the ECM. Disconnect the battery before turning off the
transmitter.
• Don’t Get Burned: The motor can become extremely hot during use,
so be careful not to touch it until it cools. Supply adequate airflow for
cooling.
• Use the Factory-Installed Connectors: Do not change the battery or
motor connectors. Improper wiring can cause fire or damage to the
ECM. Please note that modifying the electrical components will void
your warranty.
• No Reverse Voltage: The ECM is not protected against reverse polarity
voltage.
• Always adhere to the minimum and maximum limitations of the ECM.
Only use the ECM with the included Traxxas 2-cell LiPo iD® battery and a
compatible Traxxas motor.
SAFETY PRECAUTIONS
WARNING! CAUTION! DANGER!
FIRE HAZARD! This vehicle requires LiPo
batteries. Charging and discharging batteries has
the potential for fire, explosion, serious injury, and property
damage if not performed per the instructions. In addition,
Lithium Polymer (LiPo) batteries pose a SEVERE risk of fire if not
properly handled per the instructions and require special care
and handling procedures for long life and safe operation. LiPo
batteries are intended only for advanced users that are educated
on the risks associated with LiPo battery use. Traxxas does not
recommend that anyone under the age of 18 use or handle
LiPo battery packs without the supervision of a knowledgeable
and responsible adult. DO NOT attempt to charge or use LiPo
batterires if you do not understand these warnings. Dispose of
used batteries according to the instructions.
• Your model requires the use of LiPo batteries. LiPo batteries have
a minimum safe discharge voltage threshold that should not
be exceeded. The electronic control module (ECM) is equipped
with built-in Low-Voltage Detection that alerts the driver when
LiPo batteries have reached their minimum voltage (discharge)
threshold. It is the driver’s responsibility to stop immediately to
prevent the battery pack from being discharged below its safe
minimum threshold.
• Low-Voltage Detection is just one part of a comprehensive plan
for safe LiPo battery use. It is critical to follow all instructions for
safe and proper charging, use, and storage of LiPo batteries. Make
sure you understand how to use your LiPo batteries. If you have
questions about LiPo battery usage, please consult with your local
hobby dealer or contact the battery manufacturer. As a reminder, all
batteries should be recycled at the end of their useful life.
• ONLY use the supplied Traxxas iD® LiPo balance charger to
charge the included Traxxas iD battery. Never use NiMH or
NiCad-type chargers or charge modes to charge LiPo batteries.
DO NOT charge LiPo batteries with a NiMH-only charger. The
use of a NiMH or NiCad charger or charge mode will damage
LiPo batteries and may cause fire, personal injury, and/or
property damage.
• NEVER charge LiPo battery packs in series or parallel. Charging
packs in series or parallel may result in improper charger cell
recognition and an improper charging rate that may lead to
overcharging, cell imbalance, cell damage, and fire.
• ALWAYS inspect your LiPo batteries carefully before
charging. Look for any loose leads or connectors,
damaged wire insulation, damaged cell packaging, impact
damage, fluid leaks, swelling (a sign of internal damage), cell
deformity, missing labels, or any other damage or irregularity.
If any of these conditions are observed, do not charge or use
the battery pack. Follow the disposal instructions included with
your battery to properly and safely dispose of the battery.
• DO NOT store or charge LiPo batteries with or around other
batteries or battery packs of any type, including other LiPos.
• Store and transport your battery pack(s) in a cool dry place.
DO NOT store in direct sunlight. DO NOT allow the storage
temperature to exceed 140°F or 60°C, such as in the trunk of a
car, or the cells may be damaged and create a fire risk.
• DO NOT disassemble LiPo batteries or cells.
• DO NOT attempt to build your own LiPo battery pack from
loose cells.
• BEFORE you charge, ALWAYS confirm that the charger settings
exactly match the type (chemistry), specification, and configuration
of the battery to be charged. DO NOT exceed the maximum
manufacturer recommended charge rate.
• DO NOT attempt to charge non-rechargeable batteries (explosion
hazard), batteries that have an internal charge circuit or a
protection circuit, batteries that have been altered from original
manufacturer configuration, or batteries that have missing or
unreadable labels, preventing you from properly identifying the
battery type and specifications. ALWAYS use a Traxxas iD charger
to charge Traxxas iD batteries. DO NOT use a non-Traxxas charger
to charge Traxxas iD batteries. It is not recommended, but if you
choose to use a non-Traxxas charger or battery, read and follow
all of the manufacturer’s warnings and instructions.
• DO NOT let any exposed battery contacts or wires touch each other.
This will cause the battery to short circuit and create the risk of fire.
• While charging or discharging, ALWAYS place the battery (all
types of batteries) in a fire retardant/fire proof container and on
a non-flammable surface such as concrete.
• DO NOT charge batteries inside of an automobile. DO NOT charge
batteries while driving in an automobile.
• NEVER charge batteries on wood, cloth, carpet, or on any other
flammable material.
(continued on next page)
TRX-4M • 5
SAFETY PRECAUTIONS
(continued from previous page)
• ALWAYS charge batteries in a well-ventilated area.
• REMOVE flammable items and combustible materials from the
charging area.
• DO NOT leave the charger and battery unattended while
charging, discharging, or anytime the charger is ON with a battery
connected. If there are any signs of a malfunction or in the event
of an emergency, unplug the charger from the power source and
disconnect the battery from the charger.
• DO NOT operate the charger in a cluttered space, or place objects
on top of the charger or battery.
• If any battery or battery cell is damaged in any way, DO NOT charge,
discharge, or use the battery.
• Keep a Class D fire extinguisher nearby in case of fire.
• DO NOT disassemble, crush, short circuit, or expose the batteries to
flame or other source of ignition. Toxic materials could be released.
If eye or skin contact occurs, flush with water.
• If a battery gets hot to the touch during the charging process
(temperature greater than 110°F / 43°C), immediately disconnect the
battery from the charger and discontinue charging.
6 • TRX-4M
• Allow the battery pack to cool off between runs (before charging).
• ALWAYS unplug the charger and disconnect the battery when not
in use.
• ALWAYS unplug the battery from the electronic control module
(ECM) when the model is not in use and when it is being stored or
transported.
• DO NOT disassemble the charger.
• REMOVE the battery from your model or device before charging.
• DO NOT expose the charger to water or moisture. For indoor use
only.
• DO NOT use an adapter of any kind or modify or change the battery
plug/connector.
• ALWAYS store battery packs safely out of the reach of children
or pets. Children should always have adult supervision when
charging and handling batteries.
• Always proceed with caution and use good common sense at
all times.
tools, supplies, and required equipment
Your model comes with a set of specialty metric tools. You’ll need to purchase other items, available from your hobby dealer, to operate
and maintain your model.
Supplied Tools and Equipment
2.0mm “L” wrench
1.5mm “L” wrench
4-way wrench
Shock pre-load spacers
For more information on
batteries, see Use the Right
Batteries on page 13.
Recommended Equipment
These items are not required
for the operation of your
model, but are a good idea to
include in any R/C toolbox:
• Safety glasses
• Hobby knife
• Side cutters and/or needle
nose pliers
• Speed Bit Set, Part #8712
Traxxas recommends genuine Traxxas iD®
batteries and chargers for safer charging,
maximum battery life, and performance.
750mAh 7.4V 2-cell iD® LiPo battery*
iD® LiPo balance charger*
Required Equipment (not included)
4 AA alkaline batteries
*Battery and charger style are subject to change and may vary from images.
TRX-4M • 7
MODEL OVERVIEW
Chassis Top View
Front Bumper
Steering Tie Rod
Chassis Rail
Steering Block
Electronic Control Module (ECM)
Rear Bumper
Rear Bumper Mount
Front Shock Mount
Steering Servo
Motor
Front Bumper Mount
8 • SUMMIT
Caster Block (C-hub)
Shock
Transmission
Batttery Tray
Battery Strap
Rear Shock Mount
MODEL OVERVIEW
Chassis Bottom View
Front Lower
Shock Mount
Front Upper Link
Front Lower Link
Rear Lower Link
Rear Upper Link
Rear Axle Cover
Servo Horn
Front Drive Cup
Rear Drive Cup
Front Center Driveshaft
Rear Center Driveshaft
Skidplate
Front Axle Cover
Front Axle
Rear Lower
Shock Mount
Rear Axle
TRX-4M • 9
quick start: getting up to speed
The Quick Start Guide is
not intended to replace the
full operating instructions
available in this manual.
Please read this entire
manual for complete
instructions on the proper
use and maintenance of
your model.
The following guide is an overview of the procedures for getting your model running. Look for the Quick Start logo on the bottom
corners of Quick Start pages.
1. Read the safety precautions on page 4
For your own safety, understand where carelessness and misuse
could lead to personal injury.
2. Charge the battery pack • See page 13
Fully charge the battery pack included with your model.
3. Install batteries in the transmitter • See page 13
The transmitter requires 4 AA alkaline batteries (sold separately).
4. Install the battery pack • See page 14
Install the included battery pack in your model.
Look for the Quick Start
logo at the bottom of
Quick Start pages.
10 • TRX-4M
5. Turn on the radio system • See page 15
Make a habit of turning the transmitter on first and off last.
6. Drive your model • See page 18
Driving tips and adjustments for your model.
7. Maintaining your model • See page 22
Follow these critical steps to maintain the performance
of your model and keep it in excellent running condition.
TRAXXAS TQ RADIO SYSTEM
INTRODUCTION
Your model includes the TQ 2.4GHz transmitter. When powered on, the
TQ 2.4GHz will automatically locate and lock onto an available frequency,
allowing multiple models to be raced together without frequency
conflicts. Just switch on and drive! The included TQ 2.4GHz radio system
has been programmed for your model at the factory and does not
require adjustment, but it does have settings you may need to access to
maintain proper operation of your model. The detailed instructions (page
15) included in this manual will help you understand and operate the
functions of the new TQ 2.4GHz radio system. For additional information
and how-to videos, visit Traxxas.com.
RADIO AND POWER SYSTEM TERMINOLOGY
Please take a moment to familiarize yourself with these radio and power
system terms. They will be used throughout this manual.
2.4GHz Spread Spectrum – This model is equipped with the latest R/C
technology. Unlike AM and FM systems that require frequency crystals
and are prone to frequency conflicts, the TQ 2.4GHz system automatically
selects and locks onto an open frequency, offering superior resistance to
interference and “glitching.”
BEC (Battery Eliminator Circuit) - The BEC can either be in the receiver or
in the ESC. This circuit allows the receiver and servos to be powered by
the main battery pack in an electric model. This eliminates the need to
carry a separate pack of 4 AA batteries to power the radio equipment.
Current - Current is a measure of power flow through the electronics,
usually measured in amps. If you look at wire like a garden hose, current
is a measure of how much water is flowing through the hose.
ESC (Electronic Speed Control) - An electronic speed control is the electronic
motor control inside the model. Electronic speed controls use power more
efficiently than mechanical speed controls so that the battery runs longer. An
electronic speed control also has circuitry that prevents loss of steering and
throttle control as the battery loses its charge. For the TRX-4M, the ESC is built
into the ECM-2.5 electronic control module.
ECM (Electronic Control Module) - An all-in-one module that incorporates both
an electronic speed control and a radio receiver into one electronic device.
Frequency band - The radio frequency used by the transmitter to send
signals to your model. This model operates on the 2.4GHz direct-sequence
spread spectrum.
LiPo - Abbreviation for Lithium Polymer. Rechargeable LiPo battery
packs are known for their special chemistry, which allows extremely
high energy density and current handling in a compact size. These are
high-performance batteries that require special care and handling. For
advanced users only.
mAh – Abbreviation for milliamp hour, a measure of the capacity of the
battery pack. The higher the number, the longer the battery will last
between recharges.
Neutral position - The standing position that the servos seek when the
transmitter controls are at the neutral setting.
NiCad - Abbreviation for nickel-cadmium. The original rechargeable
hobby pack, NiCad batteries have very high current handling, high
capacity, and can last up to 1000 charging cycles. Good charging
procedures are required to reduce the possibility of developing a
“memory” effect and shortened run times.
NiMH - Abbreviation for nickel-metal hydride. Rechargeable NiMH
batteries offer high current handling and much greater resistance to the
“memory” effect. NiMH batteries generally allow higher capacity than
NiCad batteries. They can last up to 500 charge cycles. A peak charger
designed for NiMH batteries is required for optimal performance.
Receiver - The radio unit inside your model that receives signals from the
transmitter and relays them to the servos.
Resistance - In an electrical sense, resistance is a measure of how an
object resists or obstructs the flow of current through it. When flow
is constricted, energy is converted to heat and is lost. Traxxas power
systems are optimized to reduce electrical resistance and the resulting
power-robbing heat.
Servo - Small motor unit in your model that operates the
steering mechanism.
Transmitter - The hand-held radio unit that sends throttle and steering
instructions to your model.
Trim - The fine-tuning adjustment of the neutral position of the servos,
made by adjusting the steering trim knob on the face of the transmitter.
2-channel radio system - The TQ 2.4GHz radio system, consisting of the
receiver, the transmitter, and the servos. The system uses two channels:
one to operate the throttle and one to operate the steering.
Voltage - Voltage is a measure of the electrical potential
difference between two points, such as between the positive battery
terminal and ground. Using the analogy of the garden hose, while
current is the quantity of water flow in the hose, voltage corresponds to
the pressure that is forcing the water through the hose.
TRX-4M • 11
TRAXXAS TQ RADIO SYSTEM
ECM-2.5 Wiring Diagram
ECM-2.5
Your model is equipped with the Traxxas TQ 2.4GHz transmitter.
The transmitter has two channels: channel one operates the
steering, and channel two operates the throttle. Your model is
equipped with one servo and an all-in-one electronic control
module (speed control and receiver).
MODEL WIRING DIAGRAM
To Lights
Channel 1
Steering Servo
TRANSMITTER AND RECEIVER
Steering Wheel
Red/Green Status LED
Motor
Set Button
Antenna
MOTOR
Electronic Control
Module (ECM)
BATTERY
ACC - Not Used
ACC - Bumper Lights
CH1 - Steering Servo
Steering
Trim
From Battery
ECM-2.5 ELECTRONIC CONTROL MODULE
Throttle
Trigger
EZ-Set® Button
LED
To Motor
Power Switch
12 • TRX-4M
Battery Compartment
From Battery
TRAXXAS TQ RADIO SYSTEM
WARNING: FIRE HAZARD!
3
Users of Lithium Polymer (LiPo) batteries must read the
Warnings and Precautions beginning on page 4. ONLY use
the supplied Traxxas iD® LiPo balance charger to charge the included
Traxxas iD® battery. DO NOT charge LiPo batteries with a NiMH-only
charger. The use of a NiMH or NiCad charger or charge mode will
damage LiPo batteries and may cause fire, personal injury, and/or
property damage.
Disconnect the battery when charging is complete.
CHARGING THE BATTERY PACK
The supplied Traxxas iD® charger is a fully featured high-output LiPo
balance charger. It features Traxxas iD technology to deliver the perfect
charge with no guesswork. The charger is equipped with a universal
USB-A plug for convenient charging almost anywhere.
The supplied charger is
designed for use only with the
included Traxxas 2-cell LiPo
iD battery. DO NOT attempt to
charge other LiPo batteries or
any other type of battery with
this charger.
Battery connected
LED solid green when charging is complete
!
Battery connected
Solid red and no green or flashing red LED
with a battery connected indicates an error
1
Plug the charger into a USB-A port.
Minimum 2 amp, 5V DC output recommended
Important! If the
battery is damaged
or defective, the
charger's green
LED will not come
on and the red LED
will glow solid or
flash. Disconnect
the battery. DO NOT
attempt to charge
the battery.
INSTALLING TRANSMITTER BATTERIES
Power on
2
Connect the battery to begin charging.
Your TQ 2.4GHz transmitter uses 4 AA batteries. The battery
compartment is located in the base of the transmitter.
1. Remove the battery compartment door by pressing the tab
and sliding the door open.
2. Install the batteries in the correct orientation as indicated in
the battery compartment.
4 AA Alkaline
Connect battery
Battery connected
LED flashes green while charging
2,3
TRX-4M • 13
TRAXXAS TQ RADIO SYSTEM
If the status LED doesn’t light
green on the transmitter, check
the polarity of the batteries.
Check rechargeable batteries
for a full charge. If you see any
other flashing signal from the
LED, refer to the chart on page
17 to identify the code.
Use the Right Batteries
Your transmitter uses AA
batteries. Use new alkaline
batteries or rechargeable
batteries, such as NiMH (nickelmetal hydride) batteries, in
your transmitter. Make sure
rechargeable batteries are
fully charged according to the
manufacturer’s instructions.
If you use rechargeable
batteries in your transmitter,
be aware that when they begin
to lose their charge, they lose
power more quickly than
regular alkaline batteries.
Caution: Discontinue running
your model at the first sign of
weak batteries (flashing red
light) to avoid losing control.
4
14 • TRX-4M
3. Reinstall the battery compartment door and
snap it closed.
4. Turn on the transmitter and check the status
LED for a solid green light.
To reinstall the body:
1. Position the body on the chassis. Align the front and rear of the
body with the front and rear bumpers.
2. Press down on the body above the latches until the latches snap
into place.
If the status LED flashes red, the transmitter batteries may be weak,
discharged, or possibly installed incorrectly. Replace with new or
freshly charged batteries. The status LED does not indicate the
charge level of the battery pack installed in the model. Refer to the
Troubleshooting section on page 16 for more information on the
transmitter status LED codes.
INSTALLING THE BATTERY PACK
REMOVING THE BODY
Your TRX-4M includes an innovative latching system (patent
pending) for securing the body to the chassis (body clips are not
required).
1. Reach beneath the front and rear bumpers and pull the latches
outward to release them.
2. Push up on the latches to release the body.
3. Lift the body straight up from the chassis.
Your model includes a 750mAh 7.4V 2-cell iD® LiPo battery. Follow
these steps to install the battery:
1. Unhook the battery strap from the tab on the battery tray.
2. Insert a fully charged battery into the battery tray with the
battery wires positioned as shown.
3. Secure the battery in the tray by pulling the strap and stretching
the end back over the tab.
TRAXXAS TQ RADIO SYSTEM
RADIO SYSTEM CONTROLS
TUR
N
GH
RI
T
TU
RN
LE
FT
Always turn your transmitter on first.
Plug in the battery to turn on the model.
Unplug the battery to turn off the model.
Always turn your transmitter off last.
Neutral
Brake/Reverse
Forward
For maximum radio range, hold the
transmitter upright and pointed in the
direction of the model.
Reversing: After stopping the model,
return the transmitter’s trigger to
neutral and push up again to activate
reverse throttle.
!
Low batteries.
Replace the 4 AA batteries.
RADIO SYSTEM RULES
• Always turn your transmitter on first and off last. This procedure
will help to prevent your model from receiving stray signals from
another transmitter or other source.
• Always turn on the transmitter before plugging the battery into
the ECM to turn on the model. To turn the model off: Unplug the
• Always use new or freshly charged batteries for the radio system.
Weak batteries will limit the radio signal between the ECM and
the transmitter.
• In order for the transmitter and ECM to bind to one another,
the battery must be plugged into the ECM within 20 seconds
of turning on the transmitter. The transmitter LED will flash fast
red, indicating a failure to link. If you miss it, simply turn off the
transmitter and start over.
RADIO SYSTEM BASIC ADJUSTMENTS
Steering Trim
To adjust, drive the vehicle forward
slowly while “steering” with the trim knob
until the vehicle travels in a straight line
with no steering input.
battery from the ECM. The battery should always be unplugged
from the ECM when the vehicle is not in use. For this reason, the
model is not equipped with a traditional on/off switch.
5
TRX-4M • 15
TRAXXAS TQ RADIO SYSTEM
TQ 2.4GHz Binding Instructions
For proper operation, the transmitter and ECM must be electronically
‘bound.’ This has been done for you at the factory. Should you ever
need to re-bind the system or bind to a different transmitter or ECM,
follow these instructions. Note: The transmitter and ECM must be
within 5 feet of each other.
1. Press and hold the SET button on the transmitter.
2. Turn on the transmitter and release the SET button. The status LED
will flash red slowly, indicating that the transmitter is in bind mode.
3. Press and hold the EZ-Set button on the ECM as you plug in the
battery; release the EZ-Set button once the status LED flashes red.
4. The status LED will flash red slowly, indicating that the ECM is in bind
mode.
5. When the LEDs on both the transmitter and the ECM turn solid
green, the system is bound and ready for use. Confirm that the
steering and throttle operate properly before driving your model.
TRANSMITTER LED CODES
LED Color / Pattern
Name
Notes
Solid green
Normal Driving
Mode
See previous page for information
on how to use the transmitter
controls.
Slow red
(0.5 sec on / 0.5 sec off)
Binding
See this page for more information
on binding.
Flashing medium red
(0.25 sec on / 0.25 sec off)
Low Battery
Alarm
Put new batteries in the
transmitter. See page 13 for
more information.
Flashing fast red
(0.125 sec on / 0.125 sec off)
Link Failure /
Error
Transmitter and ECM are no
longer bound. Unplug the battery
to turn the system off. Plug the
battery back in to resume normal
operation. Find source of the
link failure (i.e., out of range, low
batteries).
ECM LED CODES
16 • TRX-4M
LED Color / Pattern
Name
Notes
Solid green
Normal Driving
Mode
See previous page for information
on how to use your transmitter
controls.
Slow red
(0.5 sec on / 0.5 sec off)
Binding
See this page for more information
on binding.
Blinking fast red
(0.125 sec on / 0.125 sec off)
Failsafe / LowVoltage Detect
Transmitter is off or vehicle battery
needs to be recharged.
ECM-2.5 ELECTRONIC CONTROL MODULE
PROFILE SELECTION
The ECM-2.5 electronic control module is factory set to Trail Mode (100%
forward, brakes, and reverse; added brake drag when the throttle trigger
is at neutral). To activate full power without the additional brake drag
(Sport Mode) or set immediate reverse (Crawl Mode), follow these
steps. The profiles are selected by entering the programming mode.
Profile Description
Profile #1 (Sport Mode):
Profile #2 (Trail Mode):
Profile #3 (Crawl Mode):
100% Forward, 100% Brakes, 100% Reverse
100% Forward, 100% Brakes, 100% Reverse,
Drag Brake at Neutral
.100% Forward, Hill Hold Brakes at Neutral,
Immediate Reverse
Selecting Sport Mode
(Profile #1: 100% Forward, 100% Brakes,
100% Reverse)
1. Connect a fully charged battery to the
ECM-2.5 and turn on your transmitter. The
LED will glow solid green.
2. Press and hold the EZ-Set® button until
the LED begins blinking red (indicating
the Profile numbers).
3. When the LED blinks red once, release the
EZ-Set button.
4. The LED will then turn solid green. The
model is ready to drive.
Selecting Trail Mode
(Profile #2: 100% Forward, 100% Brakes,
100% Reverse, Drag Brake at Neutral)
1. Connect a fully charged battery to the
ECM-2.5 and turn on your transmitter. The
LED will glow solid green.
2. Press and hold the EZ-Set® button until
the LED begins blinking red (indicating
the Profile numbers).
3. When the LED blinks red twice, release
the EZ-Set button.
4. The LED will then turn solid green. The
model is ready to drive.
Selecting Crawl Mode
(Profile #3: 100% Forward, Hill Hold Brakes at
Neutral, Immediate Reverse)
1. Connect a fully charged battery to the
ECM-2.5 and turn on your transmitter. The
LED will glow solid green.
2. Press and hold the EZ-Set® button until
the LED begins blinking red (indicating
the Profile numbers).
3. When the LED blinks red three times,
release the EZ-Set button.
4. The LED will then turn solid green. The
model is ready to drive.
ECM-2.5 Specifications
x3
Note: If you missed the mode you wanted, keep the EZ-Set button
pressed down and the blink cycle will repeat until the button is
released and a mode is selected.
Input Voltage
2s LiPo
Case Size
1.26" W x 1.79" L x 0.60" H
Weight
0.92 ounces / 26 grams
BEC Voltage
6.0 V DC
BEC Current
1A
Low-Voltage Detection
Yes / 3-stage
Transistor Type
MOSFET
Motor Overload Protection
2-stage
LOW VOLTAGE DETECTION
x1
x2
The ECM is equipped with three-stage Low Voltage Detection
(LVD) that alerts the driver when LiPo batteries have reached
their minimum voltage (discharge) threshold. Stop immediately
to prevent the battery pack from being discharged below its safe
minimum threshold. Unplug the battery and recharge. Leaving
the battery connected to the vehicle when not is use can cause
permanent battery damage. Always unplug the battery after use.
LOW VOLTAGE DETECTION
STAGE
ECM LED
ECM
LIGHTS
EXPLANATION
ACTION
1
Slow
blinking red
On
On
Vehicle speed
reduced to 25%
Unplug the battery
and recharge
2
Fast
blinking red
On
On
Vehicle will not
drive
Unplug the battery
and recharge
3
Off
Off
Off
Stage 3 shutdown
Unplug the battery
and recharge
PRO SCALE® LIGHTING
Your new Traxxas model is enabled with Pro Scale® lighting features,
such as headlights, reverse lights, and brake lights. Visit Traxxas.com to
learn more about these features and available Traxxas Pro Scale Lighting
Kits, parts, and accessories.
TRX-4M • 17
DRIVING YOUR MODEL
Now it’s time to have some fun! This section contains instructions on
driving and getting the most enjoyment out of your model. Before you
go on, here are some important precautions to keep in mind:
• Your model is designed to run for long periods of mixed driving
across different surface types. If you are running frequently in tall
grass, deep sand, thick carpet, or other high load conditions, you
may overheat the motor. Monitor the motor temperature and
allow the model to cool if the motor become hot to the touch.
• The ECM-2.5 is equipped with Low Voltage Detection to prevent the
LiPo battery from being discharged below its safe minimum threshold
(see page 16 for more information). When this happens, stop driving
immediately, unplug the battery, and recharge.
• When the batteries in the transmitter become weak, the red power
light on the transmitter will begin to flash. Stop immediately and
install new batteries.
• Do not drive the model on public streets or in large crowds of people.
Your model may present a tripping hazard and could cause injury.
• Do not operate your model at night, or anytime your line of sight to
the model may be obstructed or impaired in any way.
• If the model becomes stuck against an object, do not continue to run
the motor. Remove the obstruction before continuing. Do not push or
pull objects with the model.
• TRX-4M uses a sophisticated 4-link suspension to crawl over obstacles.
If an obstacle is too large for your model to clear on the first attempt,
back up and consider a different angle or approach. Even a slight
change in steering angle can allow TRX-4M avoid snags or highcentering.
• Although unlikely, it is possible for radio interference to momentarily
affect the performance of your model. If you notice erratic behavior
from the steering or throttle, consider moving away from the source
before continuing.
• Use good, common sense whenever you are driving your model.
Intentionally driving in an abusive and rough manner will only result
in poor performance and broken parts. Take care of your model so
that you can enjoy it for a long time to come.
• It is possible for the screws and other hardware on your vehicle to
loosen over time. Frequently check wheel nuts and other screws to
ensure that all hardware remains properly tightened.
6
18 • TRX-4M
About Run Time
TRX-4M’s small size and efficient drivetrain allow it to run for a long
time on a single battery charge. The LiPo battery included with
your model features a large 750mAh capacity for extended run
times. Your run times may vary depending on surface conditions
and driving style. Driving the vehicle on high-resistance surfaces
like thick carpet or in tall grass will reduce run times. Applying full
throttle and braking with every maneuver will also shorten run
times. Consider smoother, more gradual throttle application for
improved battery life.
Tips for Increasing Run Time
• ONLY use the supplied Traxxas iD® LiPo balance charger to charge the
included Traxxas iD® battery.
• Read and follow all maintenance and care instructions.
• Keep the ECM-2.5 electronic control module clean and free of
debris.
• Maintain your model. Do not allow dirt, debris, or damaged parts to
cause binding in the drivetrain.
RUNNING IN WET CONDITIONS
Your TRX-4M is designed with water-resistant features to protect the
electronics in the model (ECM-2.5 electronic control module, steering
servo). This gives you the freedom to have fun driving your model
through puddles, wet grass, snow, and through other wet conditions.
Though highly water resistant, your model should not be treated as
though it is submersible or totally 100% waterproof. Water resistance
applies only to the installed electronic components. Running in wet
conditions requires additional care and maintenance for the mechanical
and electrical components to prevent corrosion of metal parts and
maintain their proper function.
Precautions
• Without proper care, some parts of your model can be seriously
damaged due to contact with water. Know that additional
maintenance procedures will be required after running in wet
conditions in order to maintain the performance of your model. Do
not run your model in wet conditions if you are not willing to accept
the additional care and maintenance responsibilities.
DRIVING YOUR MODEL
• The transmitter is not water resistant. Do not subject it to wet
conditions, such as rain.
• Do not operate your model during a rain storm or other inclement
weather where lightning may be present.
• Do not allow your model to come in contact with saltwater (ocean
water), brackish water (between fresh water and ocean water), or
other contaminated water. Saltwater is highly conductive and highly
corrosive. Use caution if you plan to run your model on or near a beach.
• Even casual water contact can reduce the life of your motor. Special
care must be taken to modify your driving style in wet conditions to
extend the life of the motor (details below).
Before Running Your Vehicle in Wet Conditions
Consult the section “After Running Your Vehicle in Wet Conditions”
before proceeding. Make sure you understand the additional
maintenance required with wet running.
Motor Precaution
Avoid running your vehicle in water deep enough to submerge the
Titan® 180 87T motor as it can reduce motor life. If the motor does get
excessively wet or submerged, use very light throttle (run the motor
slowly) until the excess water can run out. Applying full throttle to a
motor full of water can cause premature motor failure. Your driving
habits will determine motor life with a wet motor.
After Running Your Vehicle in Wet Conditions
1. Remove the battery.
2. Rinse excess dirt and mud off the truck with low-pressure water,
such as from a garden hose. Do not use a pressure washer or other
high-pressure water. Avoid directing water into the bushings,
bearings, transmission, etc.
3. Blow off the truck with compressed air (optional, but
recommended). Wear safety glasses when using compressed air.
4. Remove the wheels/tires from the truck.
5. Your vehicle comes equipped with low maintenance selflubricating bushings, but it’s still good practice to spray all
bushings, bearings, and other metal parts with WD- 40® or similar
water-displacing light oil.
6. Let the truck stand or you may blow off with compressed air. Placing
the truck in a warm, sunny spot will aid drying. Trapped water and
oil will continue to drip from the truck for a few hours. Place it on a
towel or piece of cardboard to protect the surface underneath.
7. Additional Maintenance: Increase your frequency of disassembly,
inspection, and lubrication of the following items. This is necessary
after extended wet use or if the vehicle will not be used for an
extended period of time (such as a week or longer). This additional
maintenance is needed to prevent any trapped moisture from
corroding internal steel components.
• Front and rear axle assemblies: Remove and clean the front and
rear axles as needed. Refer to your exploded view diagrams for
help with disassembly and reassembly.
• Transmission: Remove, disassemble, and clean the transmission
components. Refer to your exploded view diagrams for help with
disassembly and reassembly.
TRX-4M • 19
TUNING ADJUSTMENTS
SUSPENSION TUNING
Important: The shocks are
assembled at the factory
with a center-to-center
distance (between the rod
end balls) of 51mm. Any time
the shocks are removed and
disassembled, this distance
should be checked to ensure
proper operation of the
suspension.
51mm
Springs
TRX-4M’s front and rear springs (0.95 rate) have been carefully selected
to provide full suspension articulation and support for the weight of
the vehicle body. Using different bodies with lighter weight will allow
you to use lower rate springs to increase suspension articulation when
traversing difficult terrain.
SHOCK TUNING
Shock Oil
The 4 oil-filled shocks (dampers) effectively control the suspension
movement by preventing the wheels and tires from continuing to
“bounce” after rebounding from a bump. Changing the oil in the
shocks can vary the suspension damping effect. Changing the oil to
a higher viscosity oil will increase damping. Lowering the viscosity
of the oil will cause the suspension damping to be reduced.
Damping should be increased (with higher viscosity oil) when
stiffer springs are installed. Damping should be decreased (with
thinner viscosity oil) when softer springs are installed. The viscosity
of shock oil is affected by extremes in operating temperature;
an oil of certain viscosity will become less viscous at higher
temperatures and more viscous at lower temperatures. Operating
in regions with cold temperatures may require lower viscosity oil.
From the factory, the shocks are filled with SAE-20W silicone oil.
Only use 100% silicone oil in the shock.
Replacing Shock Oil
The shocks have to be removed from the
vehicle and disassembled to change the oil.
1. Remove the shock cap, bladder, and
lower spring retainer.
2. Compress the shock fully so that the
rod end is against the bottom of the
shock body (A).
3. Fill the shock with new silicone shock
oil to the top of the shaft; then, add
2-3 drops of oil to reach the proper
level (B).
Note: Traxxas offers SAE-20W silicone
shock oil as part #5031 or a full silicone
shock oil set as part #5038X.
4. Move the piston up and down slowly
to remove excess air. Add oil if needed
to maintain the proper level.
5. Fully extend the shaft and reinstall the
bladder, shock cap, and lower spring
retainer.
6. Tighten the shock cap until snug.
Shock Disassembly
The shocks must be removed from the vehicle prior to disassembly.
Use the shock exploded views included with the model to aid in the
assembly process.
1. Remove the lower spring retainer and spring from the shock.
2. Remove the shock cap and empty the shock body of shock oil.
3. Use side cutters to grip the shock shaft just above the rod end.
Remove the rod end from the shock shaft.
4. Remove the lower cap from the shock body with a small flat
blade screwdriver. Slide the shock shaft with piston out of the
shock body.
5. Remove the o-rings and spacer from the bottom of the shock
body.
20 • TRX-4M
B
A
TUNING ADJUSTMENTS
Shock Assembly
1. Insert the shock shaft
assembly through the
shock body until the piston
bottoms out.
2. Lubricate the shaft and
o-rings with silicone oil.
3. Install the one o-ring over the
shaft and into the bore of the
shock body followed by one
small black spacer, and then
another o-ring.
4. Install the lower cap by
pressing it onto the shock
body until it snaps on.
5. Grip the shaft close to the
threads with needle nose
pliers or side cutters and
thread the rod end onto the
shock shaft until the rod end
bottoms out.
6. Fill the shock with new silicone
shock oil (see the “Replacing
Shock Oil” section on the
previous page).
7. Slowly thread the upper
cap with the installed shock
bladder onto the shock body.
The excess oil will bleed out of the small hole in the shock cap.
Tighten the shock cap until snug.
8. Reinstall the spring and lower retainer.
TRX-4M • 21
MAINTAINING YOUR MODEL
Always wear eye protection
when using compressed
air or spray cleaners and
lubricants.
Your model requires timely maintenance in order to stay in top
running condition. The following procedures should be taken
very seriously.
Inspect the vehicle for obvious damage or wear. Look for:
1. Cracked, bent, or damaged parts
2. Check the wheels and steering for binding.
3. Check the operation of the shocks.
4. Check the wiring for any frayed wires or loose connections.
5. Check the mounting of the electronic control module (ECM)
and servo.
6. Check the tightness of the wheel nuts with a wrench.
7. Check the operation of the radio system, especially the
condition of the batteries.
8. Check for any loose screws in the chassis structure
or suspension.
Other periodic maintenance:
• Chassis: Keep the chassis clean of accumulated dirt and grime.
Periodically inspect the chassis for damage.
• Shocks: Keep the oil level in the shocks full. Use only 100%
pure silicone shock oil to prolong the life of the seals. If you are
experiencing leakage around the top of the shock, inspect the
bladder for signs of damage or distortion from overtightening.
If the bottom of the shock is leaking, then it is time for a rebuild.
The Traxxas rebuild kits for two shocks are part #9762 and 9762A.
• Suspension: Periodically inspect the model for signs of damage,
such as bent linkage rods, bent shock shafts, loose screws, or any
signs of stress or bending. Replace components as needed.
7
22 • TRX-4M
• Center Driveline: Inspect the driveline for signs of wear such
as worn or dirty center drive shafts, and any unusual noise or
binding. Do not allow dirt and grime to collect in the drive cups.
Tighten, clean, or replace components as needed.
• Transmission: Periodically remove the transmission from
the model and inspect for any signs of damage. Disassemble
and clean the transmission components. Replace components
as needed. Complete Pro-Built® transmission assemblies are
available as part #9791, 9791R, or 9791X.
• Front and Rear Axles: Remove and clean the front and rear axles as
needed. Replace any damaged components.
Storage
When you are through running the model for the day, blow it off
with compressed air or use a soft bristled paint brush to dust-off
the vehicle. Always disconnect and remove the battery from the
model whenever the model is stored. If the model will be stored for
a long time, then also remove the batteries from the transmitter.
If you have questions or need technical assistance, call Traxxas at
1-888-TRAXXAS
(1-888-872-9927) (U.S. residents only)
1
owner’s manual
MODEL 97074-1
6250 Traxxas Way McKinney, Texas 75070
1-888-TRAXXAS
220915
97074-1-OM-EN-R00
Ford Motor Company Trademarks
and Trade Dress used under
license to Traxxas.