MODEL 97054-1

owner’s manual
 introduction

3 BEFORE YOU Thank you for purchasing the Traxxas TRX-4M™ with the Land
PROCEED Rover® Defender® Body. This officially licensed model gets the full Traxxas Support
Traxxas treatment with unsurpassed realism, including the molded Traxxas support is with you every step of the
4 SAFETY front grille, ExoCage, door handles, and side mirrors. The design of way. Refer to the next page to find out how to
PRECAUTIONS the TRX-4M offers a new way to experience all the fun, adventure, contact us and what your support options are.
and scale realism of the TRX-4 in a 1/18 platform. Oil-filled shocks
7 TOOLS, SUPPLIES, control body motion and provide smooth suspension travel over Quick Start
AND REQUIRED any terrain. Steel frame rails and a smooth running drivetrain give it This manual is designed with a Quick
EQUIPMENT true outdoor capability over rocks and through grass and streams. Start path that outlines the necessary
The tight turning radius and precise throttle control give it fantastic procedures to get your model up
8 MODEL OVERVIEW indoor maneuverability. Your new RC model offers the highest level and running in the shortest time possible. If you are an
of innovation, performance, and quality that is the hallmark of all experienced RC enthusiast, you will find it helpful and fast.
10 QUICK START: Traxxas vehicles. Be sure and read through the rest of the manual to learn
GETTING UP about important safety, maintenance, and adjustment
TO SPEED This manual contains the instructions you will need to operate and procedures. Turn to page 10 to begin.
maintain your model so that you can enjoy it for years to come. We
11 TRAXXAS TQ want you to feel confident that you own one of the best-performing Even if you are an experienced RC enthusiast, it’s important to
RADIO SYSTEM models in the market and that it is backed by a team of professionals read and follow the procedures in this manual.
who aim to provide the highest level of factory support possible.
Thank you again for going with Traxxas. We work hard every day
17 ECM-2.5 ELECTRONIC Traxxas models are about experiencing total performance and
CONTROL MODULE to assure you the highest level of customer satisfaction possible.
satisfaction, not just with your model, but also with the company
We truly want you to enjoy your new model!
that stands behind it.
18 DRIVING YOUR MODEL REGISTERING YOUR MODEL
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 In order to serve you better as our customer, please
20 TUNING register your product within 10 days of your purchase
Owner’s Manual. This manual contains all the necessary setup and
ADJUSTMENTS
operating procedures that allow you to unlock the performance online at Traxxas.com/register.
and potential that Traxxas engineers designed into your model. Traxxas.com/register
22 MAINTAINING
YOUR MODEL 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. However, there is no guarantee that interference will
not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the
user is encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
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.
Radio Frequency (RF) Exposure Statement
2 • TRX-4M 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.
before you proceed
Carefully read and follow all instructions in this and any SUPPORT Traxxas
accompanying materials to prevent serious damage to your If you have any questions about your model or its operation, 6250 Traxxas Way
model. Failure to follow these instructions will be considered call the Traxxas Technical Support Line toll-free at: McKinney, Texas 75070
abuse and/or neglect. 1-888-TRAXXAS (1-888-872-9927)* Phone: 972-549-3000
Toll-free 1-888-TRAXXAS
Before running your model, look over this entire manual and Technical support is available 7 days a week from 8:30am to 9:00pm
examine the model carefully. If for some reason you decide it is not central time. Technical assistance is also available at Traxxas. Internet
what you wanted, then do not continue any further. Your hobby com. You may also e-mail customer support with your question at Traxxas.com
dealer absolutely cannot accept a model for return or exchange support@Traxxas.com. Join thousands of registered members in our E-mail: support@Traxxas.com
after it has been run. online community at Traxxas.com.
Entire contents ©2022 Traxxas.
Warnings, Helpful Hints, & Cross-References Traxxas offers a full-service, on-site repair facility to handle any All rights reserved. Traxxas,
Throughout this manual, you’ll notice warnings and helpful hints of your Traxxas service needs. Maintenance and replacement Ready-To-Drive, TQ, Titan, TRX-4M,
identified by the icons below. Be sure to read them! parts may be purchased directly from Traxxas by phone or online and ECM-2.5 are trademarks or
at Traxxas.com. You can save time, along with shipping and handling registered trademarks of Traxxas.
costs, by purchasing replacement parts from your local dealer. Other brand names and marks are
An important warning about personal safety or avoiding
the property of their respective
damage to your model and related components. Do not hesitate to contact us with any of your product support needs. holders and are used only for
We want you to be thoroughly satisfied with your new model! purposes of identification. No part
Special advice from Traxxas to make things easier of this manual may be reproduced
and more fun. or distributed in print or electronic
media without the express
Refers you to a page with a related topic. written permission of Traxxas.
Specifications are subject to change
without notice.

Land Rover and the Land Rover

Logo are trademarks owned and
licensed by Jaguar Land Rover
Limited.
Officially Licensed Product. Land
Rover Trademarks used under
license to Traxxas LP.

*Toll-free support is available to U.S. residents only. TRX-4M • 3

 safety precautions
All of us at Traxxas want you to safely enjoy your new model. Operate Electronic Control Module (ECM)
All instructions and your model sensibly and with care, and it will be exciting, safe, and fun Your model’s electronic control module (ECM) is an extremely powerful
precautions outlined in this for you and those around you. Failure to operate your model in a safe and electronic device capable of delivering high current. Please closely follow
manual should be strictly responsible manner may result in property damage and serious injury. these precautions to prevent damage to the ECM or other components.
followed to ensure safe The precautions outlined in this manual should be strictly followed to • Disconnect the Battery: Always disconnect the battery from the ECM
operation of your model. help ensure safe operation. You alone must see that the instructions are when not in use.
followed and the precautions are adhered to. • Insulate the Wires: Always insulate exposed wiring with heat shrink
Important Points to Remember tubing to prevent short circuits.
This model is not intended • Your model is not intended for use on public roads or congested areas • Transmitter on First: Switch on your transmitter first before connecting
for use by children under where its operation can conflict with or disrupt pedestrian or vehicular the battery to the ECM. Disconnect the battery before turning off the
18 years of age without the transmitter.
traffic.
supervision of a responsible
• Never, under any circumstances, operate the model in crowds of people. • Don’t Get Burned: The motor can become extremely hot during use,
and knowledgeable adult.
Your model may present a tripping hazard and could cause injury. so be careful not to touch it until it cools. Supply adequate airflow for
• Because your model is controlled by radio, it is subject to radio cooling.
interference from many sources that are beyond your control. Since • Use the Factory-Installed Connectors: Do not change the battery or
radio interference can cause momentary losses of radio control, always motor connectors. Improper wiring can cause fire or damage to the
allow a safety margin in all directions around the model in order to ECM. Please note that modifying the electrical components will void
prevent collisions. your warranty.
• The motor can become hot during use. Be careful to avoid getting • No Reverse Voltage: The ECM is not protected against reverse polarity
burned. voltage.
• Don’t operate your model at night, or anytime your line of sight to the • Always adhere to the minimum and maximum limitations of the ECM.
No previous experience model may be obstructed or impaired in any way. Only use the ECM with the included Traxxas 2-cell LiPo iD® battery and a
with radio controlled compatible Traxxas motor.
models is required.
Models require a minimum
of setup, maintenance, or
support equipment.

1
4 • TRX-4M
 SAFETY PRECAUTIONS

WARNING! CAUTION! DANGER!

• ALWAYS inspect your LiPo batteries carefully before
FIRE HAZARD! This vehicle requires LiPo
charging. Look for any loose leads or connectors,
batteries. Charging and discharging batteries has
damaged wire insulation, damaged cell packaging, impact
the potential for fire, explosion, serious injury, and property
damage, fluid leaks, swelling (a sign of internal damage), cell
damage if not performed per the instructions. In addition,
deformity, missing labels, or any other damage or irregularity.
Lithium Polymer (LiPo) batteries pose a SEVERE risk of fire if not
If any of these conditions are observed, do not charge or use
properly handled per the instructions and require special care
the battery pack. Follow the disposal instructions included with
and handling procedures for long life and safe operation. LiPo
your battery to properly and safely dispose of the battery.
batteries are intended only for advanced users that are educated
• DO NOT store or charge LiPo batteries with or around other
on the risks associated with LiPo battery use. Traxxas does not
batteries or battery packs of any type, including other LiPos.
recommend that anyone under the age of 18 use or handle
LiPo battery packs without the supervision of a knowledgeable • Store and transport your battery pack(s) in a cool dry place.
and responsible adult. DO NOT attempt to charge or use LiPo DO NOT store in direct sunlight. DO NOT allow the storage
batterires if you do not understand these warnings. Dispose of temperature to exceed 140°F or 60°C, such as in the trunk of a
used batteries according to the instructions. car, or the cells may be damaged and create a fire risk.
• Your model requires the use of LiPo batteries. LiPo batteries have • DO NOT disassemble LiPo batteries or cells.
a minimum safe discharge voltage threshold that should not • DO NOT attempt to build your own LiPo battery pack from
be exceeded. The electronic control module (ECM) is equipped loose cells.
with built-in Low-Voltage Detection that alerts the driver when • BEFORE you charge, ALWAYS confirm that the charger settings
LiPo batteries have reached their minimum voltage (discharge) exactly match the type (chemistry), specification, and configuration
threshold. It is the driver’s responsibility to stop immediately to of the battery to be charged. DO NOT exceed the maximum
prevent the battery pack from being discharged below its safe manufacturer recommended charge rate.
minimum threshold. • DO NOT attempt to charge non-rechargeable batteries (explosion
• Low-Voltage Detection is just one part of a comprehensive plan hazard), batteries that have an internal charge circuit or a
for safe LiPo battery use. It is critical to follow all instructions for protection circuit, batteries that have been altered from original
safe and proper charging, use, and storage of LiPo batteries. Make manufacturer configuration, or batteries that have missing or
sure you understand how to use your LiPo batteries. If you have unreadable labels, preventing you from properly identifying the
questions about LiPo battery usage, please consult with your local battery type and specifications. ALWAYS use a Traxxas iD charger
hobby dealer or contact the battery manufacturer. As a reminder, all to charge Traxxas iD batteries. DO NOT use a non-Traxxas charger
batteries should be recycled at the end of their useful life. to charge Traxxas iD batteries. It is not recommended, but if you
• ONLY use the supplied Traxxas iD® LiPo balance charger to choose to use a non-Traxxas charger or battery, read and follow
charge the included Traxxas iD battery. Never use NiMH or all of the manufacturer’s warnings and instructions.
NiCad-type chargers or charge modes to charge LiPo batteries. • DO NOT let any exposed battery contacts or wires touch each other.
DO NOT charge LiPo batteries with a NiMH-only charger. The This will cause the battery to short circuit and create the risk of fire.
use of a NiMH or NiCad charger or charge mode will damage • While charging or discharging, ALWAYS place the battery (all
LiPo batteries and may cause fire, personal injury, and/or types of batteries) in a fire retardant/fire proof container and on
property damage. a non-flammable surface such as concrete.
• NEVER charge LiPo battery packs in series or parallel. Charging • DO NOT charge batteries inside of an automobile. DO NOT charge
packs in series or parallel may result in improper charger cell batteries while driving in an automobile.
recognition and an improper charging rate that may lead to • NEVER charge batteries on wood, cloth, carpet, or on any other
overcharging, cell imbalance, cell damage, and fire. flammable material. TRX-4M • 5
(continued on next page)
 SAFETY PRECAUTIONS

(continued from previous page)

• ALWAYS charge batteries in a well-ventilated area. • Allow the battery pack to cool off between runs (before charging).
• REMOVE flammable items and combustible materials from the • ALWAYS unplug the charger and disconnect the battery when not
charging area. in use.
• DO NOT leave the charger and battery unattended while • ALWAYS unplug the battery from the electronic control module
charging, discharging, or anytime the charger is ON with a battery (ECM) when the model is not in use and when it is being stored or
connected. If there are any signs of a malfunction or in the event transported.
of an emergency, unplug the charger from the power source and • DO NOT disassemble the charger.
disconnect the battery from the charger. • REMOVE the battery from your model or device before charging.
• DO NOT operate the charger in a cluttered space, or place objects • DO NOT expose the charger to water or moisture. For indoor use
on top of the charger or battery. only.
• If any battery or battery cell is damaged in any way, DO NOT charge, • DO NOT use an adapter of any kind or modify or change the battery
discharge, or use the battery. plug/connector.
• Keep a Class D fire extinguisher nearby in case of fire. • ALWAYS store battery packs safely out of the reach of children
• DO NOT disassemble, crush, short circuit, or expose the batteries to or pets. Children should always have adult supervision when
flame or other source of ignition. Toxic materials could be released. charging and handling batteries.
If eye or skin contact occurs, flush with water. • Always proceed with caution and use good common sense at
• If a battery gets hot to the touch during the charging process all times.
(temperature greater than 110°F / 43°C), immediately disconnect the
battery from the charger and discontinue charging.

6 • TRX-4M
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.
For more information on
batteries, see Use the Right
Supplied Tools and Equipment Batteries on page 13.

Recommended Equipment
These items are not required
for the operation of your
2.0mm “L” wrench 1.5mm “L” wrench 4-way wrench Shock pre-load spacers 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 Mount Rear Bumper

Front Shock Mount

Steering Servo

Motor Transmission

Front Bumper Mount Caster Block (C-hub) Shock Batttery Tray Battery Strap Rear Shock Mount

8 • SUMMIT
 MODEL OVERVIEW
Chassis Bottom View

Front Lower Front Upper Link Front Lower Link Rear Lower Link Rear Upper Link Rear Axle Cover
Shock Mount

Servo Horn

Front Drive Cup Rear Drive Cup

Front Center Driveshaft Rear Center Driveshaft

Skidplate

Rear Lower
Front Axle Cover Front Axle Shock Mount Rear Axle

TRX-4M • 9
 quick start: getting up to speed
The following guide is an overview of the procedures for getting your model running. Look for the Quick Start logo on the bottom
The Quick Start Guide is corners of Quick Start pages.
not intended to replace the
full operating instructions
available in this manual. 1. Read the safety precautions on page 4 5. Turn on the radio system • See page 15
Please read this entire
manual for complete For your own safety, understand where carelessness and misuse Make a habit of turning the transmitter on first and off last.
instructions on the proper could lead to personal injury.
use and maintenance of
your model.
2. Charge the battery pack • See page 13 6. Drive your model • See page 18
Fully charge the battery pack included with your model. Driving tips and adjustments for your model.

3. Install batteries in the transmitter • See page 13 7. Maintaining your model • See page 22
The transmitter requires 4 AA alkaline batteries (sold separately). Follow these critical steps to maintain the performance
of your model and keep it in excellent running condition.

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
TRAXXAS TQ RADIO SYSTEM

INTRODUCTION mAh – Abbreviation for milliamp hour, a measure of the capacity of the
Your model includes the TQ 2.4GHz transmitter. When powered on, the battery pack. The higher the number, the longer the battery will last
TQ 2.4GHz will automatically locate and lock onto an available frequency, between recharges.
allowing multiple models to be raced together without frequency Neutral position - The standing position that the servos seek when the
conflicts. Just switch on and drive! The included TQ 2.4GHz radio system transmitter controls are at the neutral setting.
has been programmed for your model at the factory and does not
NiCad - Abbreviation for nickel-cadmium. The original rechargeable
require adjustment, but it does have settings you may need to access to
hobby pack, NiCad batteries have very high current handling, high
maintain proper operation of your model. The detailed instructions (page
capacity, and can last up to 1000 charging cycles. Good charging
15) included in this manual will help you understand and operate the
procedures are required to reduce the possibility of developing a
functions of the new TQ 2.4GHz radio system. For additional information
“memory” effect and shortened run times.
and how-to videos, visit Traxxas.com.
NiMH - Abbreviation for nickel-metal hydride. Rechargeable NiMH
RADIO AND POWER SYSTEM TERMINOLOGY batteries offer high current handling and much greater resistance to the
Please take a moment to familiarize yourself with these radio and power “memory” effect. NiMH batteries generally allow higher capacity than
system terms. They will be used throughout this manual. NiCad batteries. They can last up to 500 charge cycles. A peak charger
designed for NiMH batteries is required for optimal performance.
2.4GHz Spread Spectrum – This model is equipped with the latest R/C
technology. Unlike AM and FM systems that require frequency crystals Receiver - The radio unit inside your model that receives signals from the
and are prone to frequency conflicts, the TQ 2.4GHz system automatically transmitter and relays them to the servos.
selects and locks onto an open frequency, offering superior resistance to Resistance - In an electrical sense, resistance is a measure of how an
interference and “glitching.” object resists or obstructs the flow of current through it. When flow
BEC (Battery Eliminator Circuit) - The BEC can either be in the receiver or is constricted, energy is converted to heat and is lost. Traxxas power
in the ESC. This circuit allows the receiver and servos to be powered by systems are optimized to reduce electrical resistance and the resulting
the main battery pack in an electric model. This eliminates the need to power-robbing heat.
carry a separate pack of 4 AA batteries to power the radio equipment. Servo - Small motor unit in your model that operates the
Current - Current is a measure of power flow through the electronics, steering mechanism.
usually measured in amps. If you look at wire like a garden hose, current Transmitter - The hand-held radio unit that sends throttle and steering
is a measure of how much water is flowing through the hose. instructions to your model.
ESC (Electronic Speed Control) - An electronic speed control is the electronic Trim - The fine-tuning adjustment of the neutral position of the servos,
motor control inside the model. Electronic speed controls use power more made by adjusting the steering trim knob on the face of the transmitter.
efficiently than mechanical speed controls so that the battery runs longer. An
2-channel radio system - The TQ 2.4GHz radio system, consisting of the
electronic speed control also has circuitry that prevents loss of steering and
receiver, the transmitter, and the servos. The system uses two channels:
throttle control as the battery loses its charge. For the TRX-4M, the ESC is built
one to operate the throttle and one to operate the steering.
into the ECM-2.5 electronic control module.
Voltage - Voltage is a measure of the electrical potential
ECM (Electronic Control Module) - An all-in-one module that incorporates both
difference between two points, such as between the positive battery
an electronic speed control and a radio receiver into one electronic device.
terminal and ground. Using the analogy of the garden hose, while
Frequency band - The radio frequency used by the transmitter to send current is the quantity of water flow in the hose, voltage corresponds to
signals to your model. This model operates on the 2.4GHz direct-sequence the pressure that is forcing the water through the hose.
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. TRX-4M • 11
 TRAXXAS TQ RADIO SYSTEM

ECM-2.5 Wiring Diagram Your model is equipped with the Traxxas TQ 2.4GHz transmitter. MODEL WIRING DIAGRAM
The transmitter has two channels: channel one operates the To Lights
steering, and channel two operates the throttle. Your model is
Channel 1
equipped with one servo and an all-in-one electronic control
Steering Servo
module (speed control and receiver).

ECM-2.5 TRANSMITTER AND RECEIVER

Steering Wheel
Red/Green Status LED Motor

Set Button

Antenna
Electronic Control
MOTOR Module (ECM)
BATTERY

ACC - Not Used

Steering ACC - Bumper Lights
Trim
CH1 - Steering Servo From Battery

ECM-2.5 ELECTRONIC CONTROL MODULE

Throttle
Trigger

EZ-Set® Button

LED

To Motor

Power Switch Battery Compartment From Battery

12 • TRX-4M
 TRAXXAS TQ RADIO SYSTEM

WARNING: FIRE HAZARD! 3

Users of Lithium Polymer (LiPo) batteries must read the Disconnect the battery when charging is complete. The supplied charger is
Warnings and Precautions beginning on page 4. ONLY use designed for use only with the
the supplied Traxxas iD® LiPo balance charger to charge the included included Traxxas 2-cell LiPo
Traxxas iD® battery. DO NOT charge LiPo batteries with a NiMH-only iD battery. DO NOT attempt to
charger. The use of a NiMH or NiCad charger or charge mode will charge other LiPo batteries or
damage LiPo batteries and may cause fire, personal injury, and/or any other type of battery with
property damage. this charger.

CHARGING THE BATTERY PACK Battery connected

LED solid green when charging is complete
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 Battery connected
USB-A plug for convenient charging almost anywhere. Solid red and no green or flashing red LED Important! If the
with a battery connected indicates an error battery is damaged
or defective, the
1 charger's green
Plug the charger into a USB-A port. LED will not come
on and the red LED
will glow solid or
Minimum 2 amp, 5V DC output recommended
flash. Disconnect
the battery. DO NOT
attempt to charge
the battery.

Power on INSTALLING TRANSMITTER BATTERIES

Your TQ 2.4GHz transmitter uses 4 AA batteries. The battery
compartment is located in the base of the transmitter.
2 1. Remove the battery compartment door by pressing the tab
Connect the battery to begin charging. 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

3. Reinstall the battery compartment door and To reinstall the body:

If the status LED doesn’t light
snap it closed. 1. Position the body on the chassis. Align the front and rear of the
green on the transmitter, check 4. Turn on the transmitter and check the status body with the front and rear bumpers.
the polarity of the batteries. LED for a solid green light. 2. Press down on the body above the latches until the latches snap
Check rechargeable batteries into place.
for a full charge. If you see any
other flashing signal from the If the status LED flashes red, the transmitter batteries may be weak, INSTALLING THE BATTERY PACK
LED, refer to the chart on page discharged, or possibly installed incorrectly. Replace with new or Your model includes a 750mAh 7.4V 2-cell iD® LiPo battery. Follow
17 to identify the code. freshly charged batteries. The status LED does not indicate the these steps to install the battery:
charge level of the battery pack installed in the model. Refer to the 1. Unhook the battery strap from the tab on the battery tray.
Troubleshooting section on page 16 for more information on the
2. Insert a fully charged battery into the battery tray with the
transmitter status LED codes.
battery wires positioned as shown.
Use the Right Batteries REMOVING THE BODY
Your transmitter uses AA 3. Secure the battery in the tray by pulling the strap and stretching
Your TRX-4M includes an innovative latching system (patent the end back over the tab.
batteries. Use new alkaline
batteries or rechargeable pending) for securing the body to the chassis (body clips are not
batteries, such as NiMH (nickel- required).
metal hydride) batteries, in 1. Reach beneath the front and rear bumpers and pull the latches
your transmitter. Make sure
outward to release them.
rechargeable batteries are
fully charged according to the 2. Push up on the latches to release the body.
manufacturer’s instructions. 3. Lift the body straight up from the chassis.
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
TRAXXAS TQ RADIO SYSTEM

RADIO SYSTEM CONTROLS

TUR
N

RI
GH
T
TU
RN LE
FT
Always turn your transmitter on first. Plug in the battery to turn on the model.

Neutral

Brake/Reverse

Unplug the battery to turn off the model. Always turn your transmitter off last.

• Always use new or freshly charged batteries for the radio system.
Forward Weak batteries will limit the radio signal between the ECM and
the transmitter.
For maximum radio range, hold the !
• In order for the transmitter and ECM to bind to one another,
transmitter upright and pointed in the
the battery must be plugged into the ECM within 20 seconds
direction of the model.
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
Reversing: After stopping the model, transmitter and start over.
return the transmitter’s trigger to RADIO SYSTEM BASIC ADJUSTMENTS
neutral and push up again to activate Low batteries.
Replace the 4 AA batteries. Steering Trim
reverse throttle.
To adjust, drive the vehicle forward
RADIO SYSTEM RULES slowly while “steering” with the trim knob
• Always turn your transmitter on first and off last. This procedure until the vehicle travels in a straight line
will help to prevent your model from receiving stray signals from with no steering input.
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
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.

TRX-4M • 15
 TRAXXAS TQ RADIO SYSTEM

TQ 2.4GHz Binding Instructions TRANSMITTER LED CODES

For proper operation, the transmitter and ECM must be electronically LED Color / Pattern Name Notes
‘bound.’ This has been done for you at the factory. Should you ever
Solid green Normal Driving See previous page for information
need to re-bind the system or bind to a different transmitter or ECM, Mode on how to use the transmitter
follow these instructions. Note: The transmitter and ECM must be controls.
within 5 feet of each other.
Slow red Binding See previous page for more
1. Press and hold the SET button on the transmitter. (0.5 sec on / 0.5 sec off) information on binding.

2. Turn on the transmitter and release the SET button. The status LED Flashing medium red Low Battery Put new batteries in the
will flash red slowly, indicating that the transmitter is in bind mode. (0.25 sec on / 0.25 sec off) Alarm transmitter. See page 12 for
more information.
3. Press and hold the EZ-Set button on the ECM as you plug in the
Flashing fast red Link Failure / Transmitter and ECM are no
battery; release the EZ-Set button once the status LED flashes red. (0.125 sec on / 0.125 sec off) Error longer bound. Unplug the battery
4. The status LED will flash red slowly, indicating that the ECM is in bind to turn the system off. Plug the
mode. battery back in to resume normal
operation. Find source of the
5. When the LEDs on both the transmitter and the ECM turn solid link failure (i.e., out of range, low
green, the system is bound and ready for use. Confirm that the batteries).
steering and throttle operate properly before driving your model.
ECM LED CODES
LED Color / Pattern Name Notes

Solid green Normal Driving See page 15 for information

Mode on how to use your transmitter
controls.

Slow red Binding See previous page for more

(0.5 sec on / 0.5 sec off) information on binding.

Blinking fast red Failsafe / Low- Transmitter is off or vehicle battery

(0.125 sec on / 0.125 sec off) Voltage Detect needs to be recharged.

16 • TRX-4M
ECM-2.5 ELECTRONIC CONTROL MODULE

PROFILE SELECTION Selecting Crawl Mode

The ECM-2.5 electronic control module is factory set to Trail Mode (100% (Profile #3: 100% Forward, Hill Hold Brakes at ECM-2.5 Specifications
forward, brakes, and reverse; added brake drag when the throttle trigger Neutral, Immediate Reverse) Input Voltage
is at neutral). To activate full power without the additional brake drag 1. Connect a fully charged battery to the 2s LiPo
(Sport Mode) or set immediate reverse (Crawl Mode), follow these ECM-2.5 and turn on your transmitter. The Case Size
1.26" W x 1.79" L x 0.60" H
steps. The profiles are selected by entering the programming mode. LED will glow solid green.
2. Press and hold the EZ-Set® button until Weight
Profile Description 0.92 ounces / 26 grams
the LED begins blinking red (indicating
Profile #1 (Sport Mode): 100% Forward, 100% Brakes, 100% Reverse BEC Voltage
the Profile numbers). 6.0 VDC
Profile #2 (Trail Mode): 100% Forward, 100% Brakes, 100% Reverse,
3. When the LED blinks red three times,

x3
Drag Brake at Neutral BEC Current
release the EZ-Set button. 1A
Profile #3 (Crawl Mode): .100% Forward, Hill Hold Brakes at Neutral,
4. The LED will then turn solid green. The Low-Voltage Detection
Immediate Reverse
model is ready to drive. Yes / 3-stage
Selecting Sport Mode Transistor Type
Note: If you missed the mode you wanted, keep the EZ-Set button MOSFET
(Profile #1: 100% Forward, 100% Brakes,
pressed down and the blink cycle will repeat until the button is Motor Overload Protection
100% Reverse)
released and a mode is selected. 2-stage
1. Connect a fully charged battery to the
ECM-2.5 and turn on your transmitter. The LOW VOLTAGE DETECTION
LED will glow solid green. The ECM is equipped with three-stage Low Voltage Detection
2. Press and hold the EZ-Set® button until (LVD) that alerts the driver when LiPo batteries have reached
the LED begins blinking red (indicating their minimum voltage (discharge) threshold. Stop immediately
the Profile numbers). to prevent the battery pack from being discharged below its safe
3. When the LED blinks red once, release the minimum threshold. Unplug the battery and recharge. Leaving

x1
EZ-Set button. the battery connected to the vehicle when not is use can cause
4. The LED will then turn solid green. The permanent battery damage. Always unplug the battery after use.
model is ready to drive.
LOW VOLTAGE DETECTION
Selecting Trail Mode STAGE ECM LED ECM LIGHTS EXPLANATION ACTION
(Profile #2: 100% Forward, 100% Brakes,
Slow Vehicle speed Unplug the battery
100% Reverse, Drag Brake at Neutral) 1 On On
blinking red reduced to 25% and recharge
1. Connect a fully charged battery to the
ECM-2.5 and turn on your transmitter. The Fast Vehicle will not Unplug the battery
2 On On
LED will glow solid green. blinking red drive and recharge
2. Press and hold the EZ-Set® button until
Unplug the battery
the LED begins blinking red (indicating 3 Off Off Off Stage 3 shutdown
and recharge
the Profile numbers).
3. When the LED blinks red twice, release
PRO SCALE® LIGHTING
the EZ-Set button.

x2
Your new Traxxas model is enabled with Pro Scale® lighting features,
4. The LED will then turn solid green. The such as headlights, reverse lights, and brake lights. Visit Traxxas.com to
model is ready to drive. 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 About Run Time
driving and getting the most enjoyment out of your model. Before you TRX-4M’s small size and efficient drivetrain allow it to run for a long
go on, here are some important precautions to keep in mind: time on a single battery charge. The LiPo battery included with
• Your model is designed to run for long periods of mixed driving your model features a large 750mAh capacity for extended run
across different surface types. If you are running frequently in tall times. Your run times may vary depending on surface conditions
grass, deep sand, thick carpet, or other high load conditions, you and driving style. Driving the vehicle on high-resistance surfaces
may overheat the motor. Monitor the motor temperature and like thick carpet or in tall grass will reduce run times. Applying full
allow the model to cool if the motor become hot to the touch. throttle and braking with every maneuver will also shorten run
times. Consider smoother, more gradual throttle application for
• The ECM-2.5 is equipped with Low Voltage Detection to prevent the
improved battery life.
LiPo battery from being discharged below its safe minimum threshold
(see page 16 for more information). When this happens, stop driving Tips for Increasing Run Time
immediately, unplug the battery, and recharge. • ONLY use the supplied Traxxas iD® LiPo balance charger to charge the
• When the batteries in the transmitter become weak, the red power included Traxxas iD® battery.
light on the transmitter will begin to flash. Stop immediately and • Read and follow all maintenance and care instructions.
install new batteries.
• Keep the ECM-2.5 electronic control module clean and free of
• Do not drive the model on public streets or in large crowds of people. debris.
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 • Maintain your model. Do not allow dirt, debris, or damaged parts to
the model may be obstructed or impaired in any way. cause binding in the drivetrain.
• If the model becomes stuck against an object, do not continue to run RUNNING IN WET CONDITIONS
the motor. Remove the obstruction before continuing. Do not push or Your TRX-4M is designed with water-resistant features to protect the
pull objects with the model. electronics in the model (ECM-2.5 electronic control module, steering
• TRX-4M uses a sophisticated 4-link suspension to crawl over obstacles. servo). This gives you the freedom to have fun driving your model
If an obstacle is too large for your model to clear on the first attempt, through puddles, wet grass, snow, and through other wet conditions.
back up and consider a different angle or approach. Even a slight Though highly water resistant, your model should not be treated as
change in steering angle can allow TRX-4M avoid snags or high- though it is submersible or totally 100% waterproof. Water resistance
centering. applies only to the installed electronic components. Running in wet
• Although unlikely, it is possible for radio interference to momentarily conditions requires additional care and maintenance for the mechanical
affect the performance of your model. If you notice erratic behavior and electrical components to prevent corrosion of metal parts and
from the steering or throttle, consider moving away from the source maintain their proper function.
before continuing. Precautions
• Use good, common sense whenever you are driving your model. • Without proper care, some parts of your model can be seriously
Intentionally driving in an abusive and rough manner will only result damaged due to contact with water. Know that additional
in poor performance and broken parts. Take care of your model so maintenance procedures will be required after running in wet
that you can enjoy it for a long time to come. conditions in order to maintain the performance of your model. Do
• It is possible for the screws and other hardware on your vehicle to not run your model in wet conditions if you are not willing to accept
loosen over time. Frequently check wheel nuts and other screws to the additional care and maintenance responsibilities.
ensure that all hardware remains properly tightened.

6
18 • TRX-4M
 DRIVING YOUR MODEL

• The transmitter is not water resistant. Do not subject it to wet 3. Blow off the truck with compressed air (optional, but
conditions, such as rain. recommended). Wear safety glasses when using compressed air.
• Do not operate your model during a rain storm or other inclement 4. Remove the wheels/tires from the truck.
weather where lightning may be present. 5. Your vehicle comes equipped with low maintenance self-
• Do not allow your model to come in contact with saltwater (ocean lubricating bushings, but it’s still good practice to spray all
water), brackish water (between fresh water and ocean water), or bushings, bearings, and other metal parts with WD- 40® or similar
other contaminated water. Saltwater is highly conductive and highly water-displacing light oil.
corrosive. Use caution if you plan to run your model on or near a beach. 6. Let the truck stand or you may blow off with compressed air. Placing
• Even casual water contact can reduce the life of your motor. Special the truck in a warm, sunny spot will aid drying. Trapped water and
care must be taken to modify your driving style in wet conditions to oil will continue to drip from the truck for a few hours. Place it on a
extend the life of the motor (details below). towel or piece of cardboard to protect the surface underneath.
Before Running Your Vehicle in Wet Conditions 7. Additional Maintenance: Increase your frequency of disassembly,
Consult the section “After Running Your Vehicle in Wet Conditions” inspection, and lubrication of the following items. This is necessary
before proceeding. Make sure you understand the additional after extended wet use or if the vehicle will not be used for an
maintenance required with wet running. extended period of time (such as a week or longer). This additional
maintenance is needed to prevent any trapped moisture from
Motor Precaution
corroding internal steel components.
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 • Front and rear axle assemblies: Remove and clean the front and
excessively wet or submerged, use very light throttle (run the motor rear axles as needed. Refer to your exploded view diagrams for
slowly) until the excess water can run out. Applying full throttle to a help with disassembly and reassembly.
motor full of water can cause premature motor failure. Your driving • Transmission: Remove, disassemble, and clean the transmission
habits will determine motor life with a wet motor. components. Refer to your exploded view diagrams for help with
disassembly and reassembly.
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.

TRX-4M • 19
 TUNING ADJUSTMENTS

SUSPENSION TUNING Replacing Shock Oil

Important: The shocks are Springs
The shocks have to be removed from the B
vehicle and disassembled to change the oil.
assembled at the factory TRX-4M’s front spring (0.072 rate) and rear spring (0.155 rate) have been
with a center-to-center carefully selected to provide full suspension articulation and support
distance (between the rod 1. Remove the shock cap, bladder, and
end balls) of 51mm. Any time for the weight of the vehicle body. Using different bodies with lighter lower spring retainer.
the shocks are removed and weight will allow you to use lower rate springs to increase suspension 2. Fill the shock with new silicone shock
disassembled, this distance articulation when traversing difficult terrain. oil until the shock body is about 3/4 full.
should be checked to ensure
proper operation of the SHOCK TUNING 3. Check the shock oil level by compressing
suspension. the shock fully until the rod end is
Shock Oil
against the bottom of the shock body
The 4 oil-filled shocks (dampers) effectively control the suspension
(A). Proper oil level is 2-3 drops of oil
movement by preventing the wheels and tires from continuing to
above the top of the shaft (B).
“bounce” after rebounding from a bump. Changing the oil in the
shocks can vary the suspension damping effect. Changing the oil to Note: Traxxas offers SAE-20W silicone
a higher viscosity oil will increase damping. Lowering the viscosity shock oil as part #5031 or a full silicone
shock oil set as part #5038X.
A
of the oil will cause the suspension damping to be reduced.
4. Move the piston up and down slowly to
Damping should be increased (with higher viscosity oil) when
remove excess air. Add oil if needed to
stiffer springs are installed. Damping should be decreased (with
maintain the proper level.
thinner viscosity oil) when softer springs are installed. The viscosity
51mm 5. Fully extend the shaft and reinstall the
of shock oil is affected by extremes in operating temperature;
an oil of certain viscosity will become less viscous at higher bladder, shock cap, and lower spring
temperatures and more viscous at lower temperatures. Operating retainer.
in regions with cold temperatures may require lower viscosity oil. 6. Tighten the shock cap until snug.
From the factory, the shocks are filled with SAE-20W silicone oil.
Only use 100% silicone oil in the shock. 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
 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

Your model requires timely maintenance in order to stay in top • Center Driveline: Inspect the driveline for signs of wear such
running condition. The following procedures should be taken as worn or dirty center drive shafts, and any unusual noise or
Always wear eye protection
when using compressed
very seriously. binding. Do not allow dirt and grime to collect in the drive cups.
air or spray cleaners and Tighten, clean, or replace components as needed.
Inspect the vehicle for obvious damage or wear. Look for:
lubricants. • Transmission: Periodically remove the transmission from
1. Cracked, bent, or damaged parts
2. Check the wheels and steering for binding. the model and inspect for any signs of damage. Disassemble
3. Check the operation of the shocks. and clean the transmission components. Replace components
4. Check the wiring for any frayed wires or loose connections. as needed. Complete Pro-Built® transmission assemblies are
5. Check the mounting of the electronic control module (ECM) available as part #9791, 9791R, or 9791X.
and servo. • Front and Rear Axles: Remove and clean the front and rear axles as
6. Check the tightness of the wheel nuts with a wrench. needed. Replace any damaged components.
7. Check the operation of the radio system, especially the
condition of the batteries.
8. Check for any loose screws in the chassis structure Storage
or suspension. 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
Other periodic maintenance: the vehicle. Always disconnect and remove the battery from the
• Chassis: Keep the chassis clean of accumulated dirt and grime. model whenever the model is stored. If the model will be stored for
Periodically inspect the chassis for damage. a long time, then also remove the batteries from the transmitter.
• 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 you have questions or need technical assistance, call Traxxas at
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. 1-888-TRAXXAS (1-888-872-9927) (U.S. residents only)
• 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
TRX-4M • 23
 owner’s manual

MODEL 97054-1 1

6250 Traxxas Way McKinney, Texas 75070

1-888-TRAXXAS

221109 97074-1-OM-EN-R01