Traxxas 82016-4 User Manual

MODEL 82016-4

ASSEMBLY MANUAL

INTRODUCTION

Thank you for purchasing the all-new Traxxas TRX-4
unassembled kit. The design of the TRX-4 instantly
obsoletes the status quo with greatly expanded features
and versatility. The TRX-4 features the powerful Titan® 21T
550 motor, waterproof electronics, and a smooth XL-5 HV 3s
LiPo-capable electronic speed control. The game-changing
portal axles provide greater ground clearance while the
rigid steel frame eliminates chassis ex and allows you to
navigate tough terrain. The new Canyon Trail 1.9 tires feature
tuned foam inserts to deliver superior bite on rocky surfaces
with convincing scale realism. In other words, we built it the
Traxxas way -- rugged, powerful, and ready to handle the
rigors of remote locations and all-day driving fun!

This manual details the assembly of the TRX-4. This manual
will also acquaint you with the model’s many dierent
components and its mechanical operation. Read through
the manual and examine the model carefully before
opening any of the parts bags included in the kit. If for some
reason you think the model is not what you wanted, then
do not continue any further. Your hobby dealer absolutely
cannot accept a model for return or exchange which has
been run or contains open bags. Please read the separate
Owner’s Manual before attempting to drive your new
model. You can download the Owner’s Manual for the
TRX-4, as well as the manuals for all Traxxas vehicles, at
Traxxas.com.

If you have any questions about your TRX-4, call Traxxas’
technical support department at 1-888-TRAXXAS (1-888­872-9927) (U.S. residents only). Outside the U.S., call +1-972­549-3000). Technical support is available Monday through
Friday, from 8:30am to 9:00pm central time. Technical
assistance is also available at Traxxas.com/support or via
e-mail at [e-mail].

Join thousands of registered members in our online
community at Traxxas.com. Traxxas oers 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. Do not hesitate to contact us with any of your
product support needs. We want you to be thoroughly
satised with your new model!

ASSEMBLY HINTS

To assemble this kit, you’ll need a large at working area
where you will have plenty of room to build. Be sure it’s a
place where you can leave your work spread out and not in
the way when you want to take a break from the assembly.
Allow yourself plenty of time to build this kit; assembly
time is going to vary with each individual. Experienced

builders may only need 4-5 hours to assemble this kit, while
others may spend an entire weekend on it. You should
feel comfortable with taking as much time as needed to
properly build and set up your model.

If you’ve been exploring the contents of your kit box, you’ve
noticed many bags of small parts. Open only one bag at a
time. To keep the parts organized, use small paper plates
or several large plastic plates with partitions to contain the
parts. Label the paper plates, and then pour the contents
of the bags onto them. This puts the parts out in the open
where you can nd them easily. The plates also prevent
small parts from rolling o the table.

Please read the text next to each diagram. The text contains
important information, such as assembly steps, screw
sizes, and part numbers. Also, pay attention to any notes
that may follow some steps. Before you attempt to run
your newly-built model, please read all of the instructions
and precautions included in the Owner’s Manual. You can
download the Owner’s Manual for the TRX-4, as well as the
manuals for all Traxxas vehicles, at Traxxas.com.

Remember, as you assemble your Traxxas model, you are not
alone. If you have any questions or run into diculties, call
Traxxas’ technical support department at 1-888-TRAXXAS
(1-888-872-9927) (U.S. residents only). Outside the U.S., call
[phone]). Technical support is available Monday
through Friday, from 8:30am to 9:00pm central time.

ITEMS YOU WILL NEED

Some of the tools that you may need in the maintenance
and repair of your model have been provided. These include:

• 2.0mm “T” wrench • 2.5mm “L” wrench

• 4-way wrench • High Performance Grease

• Silicone Shock Oil

Required but not included:

• Traxxas Ultra Premium Tire Glue, Part #6468 (CA glue)

• 4 AA alkaline batteries

• 6 or 7-cell NiMH battery pack, 2s or 3s LiPo battery pack,
with Traxxas High-Current connector

• Battery charger

• Safety glasses

• Needle nose pliers

The following items are not required for the operation
of your model, but are a good idea to include in any RC
toolbox:

• Metric hex driver set

• Hobby knife

• Side cutters

These items can be purchased from your hobby dealer.

(Highly recommended for kit assembly)

2 • TRAXXAS TRX-4

INTRODUCTION

RADIO SYSTEM INSTRUCTIONS

The Traxxas TQi 2.4GHz radio system is provided with your unassembled kit. Complete instructions for operating the radio
system are included in the TRX-4 Owner’s Manual. You can download the Owner’s Manual for the TRX-4, as well as the
manuals for all Traxxas vehicles, at Traxxas.com.

WARRANTY STATEMENT

Every eort has been made in component design and material selection to make your model as durable as possible
and still maintain a weight consistent with good handling. Because this model is intended for operation under severe
conditions, no warranties are expressed nor implied relating to the longevity of the parts. If you nd that a part has a
defect in materials or workmanship, please return it to us BEFORE IT IS USED, and we will gladly replace it. Damage caused
by excessive force, abuse, neglect or failure to adhere to the precautions outlined in the literature contained with your
model will void the warranty.

HARDWARE DESCRIPTIONS

The following chart is provided to help you identify the many dierent sizes and types of hardware that are used in the
assembly of this model. Note the dierence between the length measurements of the roundhead and countersunk
screws. A ruler is provided at the bottom of each page to measure the length of the screws in millimeters.

3x12mm Countersunk Screw 3x12mm Buttonhead Screw

12mm

3mm

12mm

3mm

5x10x4mm Ball Bearing

10mm 5mm

CCS Countersunk Cap Screw GS Set (Grub) Screw

CS Cap Screw PTW PTFE Washer

FCS Flathead Cap Screw MW Metal Washer

BCS Buttonhead Cap Screw E E-Clip

NL Nylon Locknut BB Ball Bearing

ICON DESCRIPTIONS

There are icons in this assembly instruction which indicate certain actions needed during assembly.

4mm

x2

x4

Grease Tube

Apply included
grease to part
indicated.

White: Silicone
Dark: High Performance

Repeat Icon

Repeat step the number
of times indicated.

Turn Icon

Indicates assembly
needs to be ipped
or turned around.

Optional Part Icon

Optional part available.
Refer to included
parts list.

Oil Bottle

Use included
silicone shock oil.

Aluminum Part Icon

Aluminum accessory
part available. Refer to
included parts list.

TRAXXAS TRX-4 • 3

A. TRANSMISSION ASSEMBLY

TRANSMISSION BAG

Transmission Case Halves (2)

5x11x4mm BB (5)

Note: Bearing Seating

Press down hard to ensure
bearings are fully seated.

3

7
7

A1. Insert 5x11x4mm bearings into transmission case halves

Bearing installs on the

outside of case half

Side view

Side view

TRANSMISSION BAG

Input Shaft

2x9.8 Pin (2)

18T Input Gear

30T Input Gear

TOOLS BAG

High Performance Grease

A2. Assemble input shaft

18T Input Gear

30T Input Gear

Apply drop

of grease

4 • TRAXXAS TRX-4

A. TRANSMISSION ASSEMBLY

TRANSMISSION BAG

Output Shaft

24T Output Gear

Drive Hub

36T Output Gear

5x8x2.5mm BB (3)

A3. Assemble output shaft

24T output gear and drive hub assembly

5x10x4mm BB

Shift dog assembly

5x8x2.5mm BB

Side view assembled

36T output gear assembly

5x8x2.5mm BB

5x8x2.5mm BB

5x10x4mm BB

Shift Dog

TOOLS BAG

High Performance Grease

Holes face

shift dog

Apply drop

of grease

ACCESSORY

Option Part

8296 Single Speed
Conversion

TRAXXAS TRX-4 • 5

A. TRANSMISSION ASSEMBLY

TRANSMISSION BAG

Shift Fork

5x8x0.5mm PTFE Washer (2)

2.5x8mm CS (5)

A4. Install input and output assemblies into main transmission housing

1

Place washers on output assembly

5x8x0.5mm

PTFE Washer

2

Place shift fork into shift dog recess

5x8x0.5mm

PTFE Washer

Shift Fork

Place assemblies into transmission case halves

3

Input Gear

Assembly

24T Output

Gear and

Drive Hub

Assembly

Secure transmission case halves together

4

2.5x8mm CS

2.5x8mm CS

Align the shift fork with the pin molded in

the transmission case half.

6 • TRAXXAS TRX-4

A. TRANSMISSION ASSEMBLY

TRANSMISSION BAG

Transfer Case Cover

5x11x4mm BB (5)

Note: Bearing Seating

Press down hard to ensure
bearings are fully seated.

3

7
7

TRANSMISSION BAG

Long Transfer Case

Output Shaft

Short Transfer Case

Output Shaft

A5. Install bearings into the transfer case

A6. Assemble and install transfer case gears

1

27T transfer case gear assembly

Short output shaft assembly

2

2x9.8 Pin (3)

27T Transfer Case Gear (3)

5x8x0.5mm PTFE Washer (2)

TOOLS BAG

High Performance Grease

3

Long output shaft assembly

Insert pin

Apply drop

of grease

Apply drop

of grease

5x8x0.5mm

PTFE Washer

Apply drop

of grease

5x8x0.5mm

PTFE Washer

TRAXXAS TRX-4 • 7

A. TRANSMISSION ASSEMBLY

TRANSMISSION BAG

Transfer Case Cover

2.5x8mm CS (3)

TRANSMISSION BAG

45T Spur Gear

Locknut

A7. Assemble transfer case

2.5x8mm CS

Once assembled, turn input shaft.
The gears should spin freely with no binding.

A8. Install slipper clutch and spur gear

4x8 Metal Washer

Spring Washer

Slipper Plate

Slipper Friction Material

Spring washer

orientation

2.0mm

Hex Wrench

Remove friction

material backing and

apply to spur gear

To tighten the slipper nut, insert the 2.0mm hex wrench into the hole
in the end of the input shaft. This locks the shaft for adjustments.
Turn the adjustment nut until all four spring washers are at; then,
tighten the nut an additional 1/16 turn (or until the slipper clutch
does not allow the spur gear to slip during normal operation).

7

3

ACCESSORY

Option Part

8249 Slipper Eliminator

8 • TRAXXAS TRX-4

4-Way

Wrench

A. TRANSMISSION ASSEMBLY

TRANSMISSION BAG

Transmission Servo Mount

Shift Linkage

3x8mm BCS (4)

ELECTRONICS BAG

2065 Servo Assembly

Note: Servo horn
is pre-installed and

factory-centered. Do

not turn servo shaft
by hand or you could
damage the servo.

A9. Install shift linkage and high/low shift servo

2065 Hi/Low shift servo

3x8mm BCS

Completed transmission assembly

3x8mm BCS

It is okay to slightly rock
horn to align ball cup.

Do not turn servo shaft
by hand or you could
damage the servo.

SAFE

NO! NO!

TRAXXAS TRX-4 • 9

B. DIFFERENTIAL ASSEMBLY

DIFFERENTIAL BAG

Dierential Carrier

Spider Gear (4)

Crosspin (2)

Di. Output Gear (Long)

DIFFERENTIAL BAG

Ring Gear

B1. Install long output and spider gears into dierential carrier

Spider gear assembly

Di. Output

Gear (Long)

Crosspin

Dierential

Carrier

x2

B2. Install ring gear assembly onto dierential carrier

1

Apply a LARGE drop

of grease between

spider gears.

2

Di. Output

Gear (Short)

4

2.5x8mm
BCS

Di. Output Gear (Short)

2.5X8mm BCS (4)

TOOLS BAG

High Performance Grease

ACCESSORY

Option Part

8279R Machined Spiral
Cut Ring Gear Set

Option Part

8287 Overdrive Ring
Gear Set

Option Part

8288 Underdrive Ring
Gear Set

Apply light

coating

3

x2

10 • TRAXXAS TRX-4

B. DIFFERENTIAL ASSEMBLY

DIFFERENTIAL BAG

2.5x12mm Pin

15x21x4mm BB

Locking Slider

10x15x4mm BB

7x14x5mm BB

B3. Install locking slider and bearings onto dierential carrier assembly

Locking Slider

2.5x12mm Pin

15x21x4mm BB

10x15x4mm BB

x2

Completed dierential assemblies

7x14x5mm BB

Side view assembled

Pin will t in slot

of locking slider.

ACCESSORY

Option Part

8297 Dierential Spool

TRAXXAS TRX-4 • 11

C. REAR AXLE ASSEMBLY

REAR AXLE BAG

Rear Axle Housing

Dierential Assembly

11T Pinion Gear

5x11x4mm BB

6x13x5mm BB

TOOLS BAG

High Performance Grease

C1. Insert bearings, pinion gear and dierential assembly into axle housing

Apply drop

of grease

6x13x5mm BB

Assembled

5x11x4mm BB

Dierential

Apply drop

of grease

assembly

ACCESSORY

Option Part

8297 Dierential Spool

REAR AXLE BAG

Locking Cable

Locking Fork

C2. Assemble locking fork and locking cable

1

2

12 • TRAXXAS TRX-4

C. REAR AXLE ASSEMBLY

REAR AXLE BAG

3mm E-Clip

C3. Install locking fork and locking cable

1 2

Use needle nose pliers
to set E-clip between
locking cable and
axle housing.

Use needle nose pliers to press
E-clip onto locking cable.

C4. Verify locking fork installation

Move the end of the locking
cable in and out to verify the
locking fork moves back and
forth on its pivot.

TRAXXAS TRX-4 • 13

C. REAR AXLE ASSEMBLY

REAR AXLE BAG

Dierential Housing Cover

2.5x16mm CS (4)

ACCESSORY

Option Part

8280R Red

Dierential Cover

Option Part

8280X Chrome

Dierential Cover

REAR AXLE BAG

Axle Portal Mounts (2)

2.5x10mm CCS (6)

C5. Install dierential housing cover

2.5x16mm
CS

2.5x16mm
CS

C6. Install axle portal mounts to axle housing

2.5x10mm CCS

Note

Orientation

ACCESSORY

Aluminum Accessory

Portal Axle Adapter

Note

Orientation

2.5x10mm CCS

14 • TRAXXAS TRX-4

C. REAR AXLE ASSEMBLY

REAR AXLE BAG

Inner Rear Portal Housing

Outer Rear Portal Housing

4x10x4mm BB

6x12x4mm BB

6x13x5mm BB

REAR AXLE BAG

2x12mm Pin

10x15x4mm BB

C7. Insert bearings into portal housings

4x10mm BB

6x13x5mm BB

x2

C8. Assemble and install portal input and output gears

Portal output gear assembly

6x12x4mm BB

Portal Output Gear

Portal Stub Axle

Portal Input Gear

(Rear)

TOOLS BAG

High Performance Grease

ACCESSORY

Option Part

8065 Machined
Input Gear

Option Part

8063 Heavy
Duty Axle

Aluminum Accessory

Aluminum Portal
Housings

Apply drop

of grease

2x12mm Pin

Portal input

gear assembly

10x15x4mm BB

Apply drop

of grease

x2

TRAXXAS TRX-4 • 15

C. REAR AXLE ASSEMBLY

REAR AXLE BAG

2.5x10mm CS (8)

REAR AXLE BAG

2.5x16mm CS (4)

C9. Assemble portal housings

Assembled

2.5x10mm CS

2.5x10mm CS

C10. Install axle driveshafts

Right Axle Driveshaft

(Long)

Right Axle
Driveshaft

Left Axle

Driveshaft

Left Axle Driveshaft

(Short)

Right Axle
Driveshaft

2.5x16mm CS

Left Axle

Driveshaft

2.5x16mm CS

ACCESSORY

Option Part

8061 Heavy Duty
Rear Axles

16 • TRAXXAS TRX-4

C. REAR AXLE ASSEMBLY

REAR AXLE BAG

Left Link Mount

Right Link Mount

2.5x10mm CS (4)

3x10mm Screw Pin (2)

12mm Wheel Hex (2)

ACCESSORY

Aluminum Accessory

Aluminum Wheel Hex

Aluminum Accessory

Aluminum Link Mounts

C11. Install link mounts and 12mm wheel hexes

3x10mm

Screw Pin

Note

Threads

12mm

Wheel Hex

2.5x10mm CS

Note

Orientation

Note

Orientation

2.5x10mm CS

Completed rear axle assembly

Check your assembly carefully.

Straight on view

TRAXXAS TRX-4 • 17

D. FRONT AXLE ASSEMBLY

FRONT AXLE BAG

Front Axle Housing

Dierential Assembly

11T Pinion Gear

5x11x4mm BB

6x13x5mm BB

TOOLS BAG

High Performance Grease

D1. Insert bearings, pinion gear and dierential assembly into axle housing

Apply drop

of grease

6x13x5mm BB

Assembled

5x11x4mm BB

Dierential

assembly

Apply drop

of grease

ACCESSORY

Option Part

8297 Dierential Spool

FRONT AXLE BAG

Locking Cable

Locking Fork

D2. Assemble locking fork and locking cable

1

2

18 • TRAXXAS TRX-4

D. FRONT AXLE ASSEMBLY

FRONT AXLE BAG

3mm E-Clip

D3. Install locking fork and locking cable

1 2

Use needle nose pliers
to set E-clip between
locking cable and
axle housing.

Use needle nose pliers to press
E-clip onto locking cable.

D4. Verify locking fork installation

Move the end of the locking
cable in and out to verify the
locking fork moves back and
forth on its pivot.

TRAXXAS TRX-4 • 19

D. FRONT AXLE ASSEMBLY

FRONT AXLE BAG

Dierential Housing Cover

2.5x16mm CS (4)

ACCESSORY

Option Part

8280R Red

Dierential Cover

Option Part

8280X Chrome

Dierential Cover

FRONT AXLE BAG

Left Caster Block

Right Caster Block

2.5x10mm CCS (6)

D5. Install dierential housing cover

2.5x16mm
CS

2.5x16mm
CS

D6. Install caster blocks onto axle housing

2.5x10 CCS

ACCESSORY

Aluminum Accessory

Caster Blocks

FRONT AXLE BAG

Inner Front Portal Housing

Outer Front Portal Housing

4x10x4mm BB

6x12x4mm BB

Note

Orientation

2.5x10 CCS

Note

Orientation

D7. Insert bearings into portal housings

4x10mm BB

6x12x4mm BB

6x13x5mm BB

6x13x5mm BB

20 • TRAXXAS TRX-4

x2

D. FRONT AXLE ASSEMBLY

FRONT AXLE BAG

Front Left Driveshaft

Front Right Driveshaft

2.5x4mm BCS (3)

2.5x10mm CS (8)

2x12mm Pin (2)

CV Crosspin

12x18x4mm BB

Portal Output Gear

D8. Assemble and install portal input and output gears

Portal input gear assembly

1

2x12mm Pin

Portal

Input Gear

(Front)

CV Crosspin

2

Note Orientation!

Short drive shaft installs in

left portal housing

Left Driveshaft (Short)

Right Driveshaft (Long)

Front Driveshaft

12x18x4mm BB

Apply drop

of grease

2.5x4mm BCS

Portal Stub Axle

Portal Input Gear

(Front)

TOOLS BAG

High Performance Grease

ACCESSORY

Option Part

8064 Machined
Input Gear

Option Part

8060 Heavy Duty Axle

Aluminum Accessory

Aluminum Portal
Housings

Long drive shaft installs in

right portal housing

1

Portal output gear assembly

Portal Output

Gear

Assemble portal housings

2.5x10mm CS

2.5x4mm BCS

2

Apply drop

of grease

Portal Stub

Axle

2x12mm Pin

Assembled

2.5x10mm CS

x2

TRAXXAS TRX-4 • 21

D. FRONT AXLE ASSEMBLY

FRONT AXLE BAG

3x12mm BCS (4)

Kingpin Bushing (4)

D9. Install portal/driveshaft assemblies to axle

Portal

Assembly

Left Axle

Driveshaft

(Short)

3x12mm BCS

Kingpin Bushing

3x12mm BCS

3x12mm BCS

Kingpin Bushing

3x12mm BCS

Right Axle Driveshaft

(Long)

Left Axle Driveshaft

(Short)

Right Axle
Driveshaft

(Long)

Portal

Assembly

FRONT AXLE BAG

Left Link Mount

Right Link Mount

2.5x10mm CS (4)

3x10mm Screw Pin (2)

12mm Wheel Hex (2)

ACCESSORY

Aluminum Accessory

Aluminum Wheel Hex

Aluminum Accessory

Aluminum Link Mounts

D10. Install link mounts and 12mm wheel hexes

Note

Orientation

2.5x10mm
CS

2.5x10mm
CS

Note

Orientation

3x10mm

Screw Pin

Note

Threads

12mm

Wheel Hex

22 • TRAXXAS TRX-4

D. FRONT AXLE ASSEMBLY

FRONT AXLE BAG

3x15mm BCS

SUSPENSION LINK BAG

Drag Link

ACCESSORY

Option Part

8274 Hollow Ball Set

D11. Install steering link to portal housings

3x15mm BCS

Drag Link

Drag Link

Completed front axle assembly

Check your assembly carefully.

92.18mm

133.18mm

Straight on view

TRAXXAS TRX-4 • 23

E. CHASSIS ASSEMBLY

CHASSIS PLASTICS BAG

Right Chassis Rail

Steering Servo Mount

Front Bumper

Mount Crossmember

Right Front Fender

3x10mm BCS (2)

3x12mm BCS (2)

ACCESSORY

E1. Assemble front bumper mount crossmember, steering servo mount, and front fender to right chassis rail

Note Orientation

Front View

Right Chassis Rail

Right Front

Fender

Steering Servo

3x12mm

BCS

Front Bumper

Mount Crossmember

Mount

3x10mm BCS

Option Part

8216 Shock Towers

CHASSIS PLASTICS BAG

Right Chassis Floor Pan

Front Right Wire Clip

3x12mm BCS

E2. Assemble right oor pan and right front wire clip to right chassis rail

Front Right

Wire Clip

Right Chassis

Floor Pan

3x12mm BCS

24 • TRAXXAS TRX-4

E. CHASSIS ASSEMBLY

CHASSIS PLASTICS BAG

Lower Gear Cover

Center Skidplate

Rear Right Wire Clip

3x10mm BCS (2)

3x12mm BCS

3x12mm

BCS

E3. Assemble front lower gear cover and center skidplate to chassis rail

1 2 3

Lower Gear

Cover

3x10mm BCS

Rear Right

Wire Clip

Center

Skidplate

Top view

Lower Gear

Cover

3x10mm BCS

CHASSIS PLASTICS BAG

Right Rear Fender

Damper Crossmember

Rear Bumper Crossmember

3x10mm BCS (4)

3x12mm BCS

E4. Assemble right rear fender, damper crossmember, and rear bumper crossmember to right chassis rail

Rear Bumper

Crossmember

Damper

Crossmember

3x10mm

BCS

3x10mm

BCS

3x12mm BCS

Right Rear

Fender

TRAXXAS TRX-4 • 25

E. CHASSIS ASSEMBLY

CHASSIS PLASTICS BAG

CHASSIS PLASTICS BAG

Left Chassis Rail

Left Front Fender

Front Battery Plate

3x10mm BCS (2)

3x12mm BCS (2)

3x8mm FCS (4)

ACCESSORY

Option Part

8216 Shock Towers

E5. Assemble left chassis rail and left front fender to right chassis rail assembly

3x8mm

FCS

3x10mm

BCS

Left Front

Fender

3x12mm

BCS

Left Chassis

Rail

CHASSIS PLASTICS BAG

CHASSIS PLASTICS BAG

Left Chassis Floor Pan

Rear Left Wire Clip

Front Left Wire Clip

3x10mm BCS (2)

3x12mm BCS (2)

E6. Assemble left oor pan, left rear and left front wire clip to left chassis rail

Front Left

Wire Clip

3x10mm

BCS

3x10mm

BCS

3x12mm

BCS

Rear Left
Wire Clip

3x12mm

BCS

26 • TRAXXAS TRX-4

E. CHASSIS ASSEMBLY

CHASSIS PLASTICS BAG

CHASSIS PLASTICS BAG

Left Rear Fender

Rock Light Covers (8)

2.5x6mm CS (10)

3x10mm BCS (4)

3x12mm BCS

E7. Assemble left rear fender to right chassis rail assembly and install rock light covers to fenders

2.5x6mm CS

Rock Light Cover

3x10mm BCS

x8

2.5x6mm
CS

2.5x6mm
CS

3x12mm

BCS

2.5x6mm
CS

3x10mm

BCS

2.5x6mm
CS

ACCESSORY

Option Part

8026 Rock Light Kit

Completed chassis assembly

Check your assembly carefully.

TRAXXAS TRX-4 • 27

F. ELECTRONICS INSTALLATION

CHASSIS PLASTICS BAG

CHASSIS PLASTICS BAG

Chassis Assembly

Transmission Assembly

3x10mm BCS (3)

ELECTRONICS BAG

Upper Gear Cover

Titan 550 Motor

Motor Mount Plate

11T Pinion Gear

F1. Install transmission assembly into chassis assembly

3x10mm

BCS

F2. Install motor into chassis assembly

1

Motor Mount

Plate

3x10mm BCS

3x8mm CS

Place servo wire into clip
before installing screws

Pinion gear should be 1-1.5mm
from end of motor shaft

A
B

C (Default)

D
E

F

G

H

3x8mm CS (2)

3x4 GS

3x8mm BCS (3)

Screw Positions

Spur Gear

39 45

9 x A

10 x B

11 x C

12 x D

13 x E

14 x F

15 A G

Pinion Gear

16 B H

17 C x

18 D x

19 E x

20 F x

21 G x

22 H x

Titan 550 Motor

2

Mesh gear teeth; then tighten set screw

3

3x8mm CS

4

3x4 GS

3x8mm BCS

3x8mm BCS

Upper Gear

Cover

28 • TRAXXAS TRX-4

F. ELECTRONICS INSTALLATION

CHASSIS PLASTICS BAG

ELECTRONICS BAG

Lower Receiver Box

TQi 2.4GHz Receiver

Receiver Foam Tape

3x6mm BCS (2)

ELECTRONICS BAG

CHASSIS PLASTICS BAG

2075 Servo

3x10mm FCS (4)

F3. Install lower receiver box onto chassis assembly

Front of

model

3x6mm BCS

3x6mm BCS

F4. Install steering servo onto chassis assembly

3x10mm FCS

Note Orientation:

Servo wires exit on

left side

Receiver

Foam Tape

Place on smooth surface portion (note orientation)

Clip wires into retainers on servo mount

and chassis rail toward receiver box

ELECTRONICS BAG

CHASSIS PLASTICS BAG

XL-5 HV Electronic

Speed Control (ESC)

3x12mm BCS (2)

F5. Install ESC onto chassis assembly

3x12mm BCS

Place ESC wire under screw
boss before installing screws

Plug bullet connectors from motor into ESC

TRAXXAS TRX-4 • 29

F. ELECTRONICS INSTALLATION

ELECTRONICS BAG

Chassis T-Lock Servo Mount

2065 Servo (2)

3x8mm BCS (6)

F6. Install T-Lock servos onto chassis

1 3

Note servo arm orientation. Ball cup mounts should be

2

3x8mm

BCS

Chassis T-Lock Servo Mount

on the same side as the top loop of servo mount.

3x8mm

BCS

Route wires

from the ESC
and the shift servo
through the top
loop of the T-Lock
servo mount before
installing the mount
on the chassis.

4

3x8mm

BCS

ELECTRONICS BAG

Receiver Box Foam Seal

Antenna Tube

Antenna Cap

3x4mm GS

Note wire routing

F7. Install receiver bottom foam

F8. Install antenna from receiver on right oor pan

Antenna Cap

3x4mm GS

2

1

Antenna Tube

30 • TRAXXAS TRX-4

F. ELECTRONICS INSTALLATION

ELECTRONICS BAG

Zip Tie

F9. Install wires into receiver box

Bundle excess wires in receiver box

BATT/CH5 Rear T-Lock Servo

CH4 Front T-Lock Servo

CH3 Shift Servo

CH2 Electronic Speed Control

CH1 Steering Servo

Correct wire routing

Caution! Pinch
point for wires.

ELECTRONICS BAG

2.5x8mm CS (2)

3x8mm BCS (3)

Receiver Box Cover

Receiver Box Plug

O-Ring Seal

Receiver Wire Clamp

Receiver Clamp Foam Seal

Silicone Grease

F10. Waterproof and seal the receiver box

1

2

Receiver Clamp

Foam Seal

Receiver Wire

Clamp

Apply small

bead of grease

3x8mm BCS

Receiver Box

Cover

Apply light

coating

Receiver Box

Plug

O-Ring

Seal

3x8mm BCS

2.5x8mm CS

TRAXXAS TRX-4 • 31

F. ELECTRONICS INSTALLATION

CHASSIS PLASTICS BAG

Battery Tray

Battery Hold-down

Pivot Post

Battery Clip

3x10mm BCS (2)

3x12mm BCS (2)

Pivot Post Screw

Battery Hold-down Screw Pin

3x10mm CCS (2)

ELECTRONICS BAG

Steering Servo Horn

3x6mm BCS

F11. Assemble and install battery tray

3x10mm

CCS

Battery

Hold-down

Screw

Pin

Pivot

Post

Battery

Tray

Pivot Post Screw

Battery

Clip

3x12mm

BCS

3x10mm

BCS

F12. Center the steering servo F13. Install servo horn on steering servo

1

2

3x6mm BCS

3x12mm

BCS

ACCESSORY

Option Part

8247X Steel Servo Arm

ACCESSORY

Option Part

The front tray can be used
to hold small Traxxas
batteries to shift weight
over the front axle.

2925X NiMH
2820X 2S LiPo
2823X 3S LiPo

Use hook and loop strap
8222 to secure.

Turn transmitter on

(see Quick Start)

3

Turn on the model

(see Quick Start)

5

Unplug battery and turn transmitter o

Completed assembly

Steering

Servo Horn

Plug battery into ESC

(see Quick Start)

4

Set Steering Trim

to Zero

Note orientation - Servo horn will face straight ahead

Check your assembly carefully.

32 • TRAXXAS TRX-4

G. SUSPENSION & DRIVELINE INSTALLATION

DAMPER BAG

Shock Assemblies

Silicone Shock Oil

Front Shock Springs

Rear Shock Springs

Upper Spring Retainers

Lower Spring Retainers

G1. Assemble GTS shocks

1 2 3 4 5

Unscrew

cap

Fill with

shock oil

Slowly move

piston to remove

excess air

6.7mm
(0.26")

Add oil to reach
the proper level

x4

Note: Shaft
should be fully
compressed when
cap is installed.

ACCESSORY

Option Part

8140 Long Arm Lift Kit
8140R Long Arm Lift Kit
8140X Long Arm Lift Kit

Option Part

8042 Springs (0.22)
8043 Springs (0.30)
8044 Springs (0.39)
8045 Springs (0.61)

Aluminum Accessory

8260A Shocks
(blue-anodized)

8260G Shocks
(green-anodized)

8260R Shocks
(red-anodized)

8260X Shocks
(hard-anodized)

GTS Shock Exploded View

Upper Spring

Retainer

Note: Install upper
spring retainer
before shock cap

Lower Spring

Retainer

Shock Cap

Shock

Spring

Exercise shock to make sure it compresses fully. If it does not, it is overlled.

Suggested Spring Preload Settings (May require ne tuning when body installed)

9mm

Left Front Shock

Assembled

Right Front Shock

Assembled

5mm 5mm 5mm

Left Rear Shock

Assembled

Right Rear Shock

Assembled

TRAXXAS TRX-4 • 33

G. SUSPENSION & DRIVELINE INSTALLATION

SUSPENSION LINK BAG

3x27mm BCS (2)

Front Lower

Suspension Links

ACCESSORY

Option Part

8140 Long Arm Lift Kit
8140R Long Arm Lift Kit
8140X Long Arm Lift Kit

Option Part

8274 Hollow Ball Set

G2. Attach front shocks and front lower suspension links to front axle assembly

Left Front

Shock Assembly

3x27mm BCS

Front

Axle Assembly

Front Lower

Suspension Links

Front Lower

Suspension Link

75.78mm

114.78mm

Right Front

Shock Assembly

3x27mm

BCS

SUSPENSION LINK BAG

3x15mm BCS (2)

3x23mm BCS

Steering Link

Front Panhard Bar

Front Upper

Suspension Link

Steering Link

G3. Attach steering link, front panhard bar and front upper suspension link to front axle assembly

Front Upper

Suspension Link

3x23mm BCS

Steering Link

Front

Panhard Bar

34.50mm

3x15mm

BCS

3x15mm

BCS

Front Upper Link

34 • TRAXXAS TRX-4

77.28mm

37.61mm

80.39mm

Front Panhard Bar

37.61mm

77.61mm

G. SUSPENSION & DRIVELINE INSTALLATION

SUSPENSION LINK BAG

3x15mm BCS (4)

3x23mm BCS (3)

G4. Attach front axle assembly to chassis assembly

3x15mm BCS

(Steering Link)

3x15mm BCS

(Front Lower Link)

3x23mm BCS

(Front Upper Link)

Install front panhard bar to chassis

and steering link to steering servo

3x15mm BCS

(Steering Link)

3x15mm BCS

(Front Panhard Bar)

Install upper and lower suspension links to chassis Install front shocks to fenders from top of chassis

3x15mm BCS

(Front Lower Link)

3x15mm BCS

(Front Lower Link)

3x23mm BCS
(Front Shock)

3x15mm BCS

(Front Lower Link)

3x23mm BCS

(Front Upper Link)

3x23mm BCS
(Front Shock)

3x15mm BCS

(Front Panhard Bar)

3x23mm BCS
(Front Shock)

3x23mm BCS
(Front Shock)

TRAXXAS TRX-4 • 35

G. SUSPENSION & DRIVELINE INSTALLATION

SUSPENSION LINK BAG

3x27mm BCS (2)

3x30mm BCS

Rear Upper

Suspension Links

Rear Lower

Suspension Links

G5. Attach rear shocks and rear suspension links to rear axle assembly

Right Rear

Shock Assembly

(Rear Upper Links)

3x27mm BCS

(Shocks and Rear

Lower Link)

Rear Lower

Suspension Link

3x30mm BCS

Rear Lower

Suspension Link

Left Rear

Shock Assembly

3x27mm BCS

(Shocks and Rear

Lower Link)

ACCESSORY

Option Part

8140 Long Arm Lift Kit
8140R Long Arm Lift Kit
8140X Long Arm Lift Kit

Option Part

8274 Hollow Ball Set

Rear Lower Link

Rear Upper Link

Rear Upper

Suspension Link

Rear Upper

Suspension Link

84.50mm

123.50mm

84.50mm

127.31mm

36 • TRAXXAS TRX-4

G. SUSPENSION & DRIVELINE INSTALLATION

SUSPENSION LINK BAG

3x15mm BCS (2)

3x23mm BCS (2)

3x25mm BCS (2)

G6. Attach rear axle assembly to chassis assembly

3x15mm BCS

(Rear Lower Link)

3x25mm BCS

(Rear Upper Link)

3x23mm BCS
(Rear Shock)

3x15mm BCS

(Rear Lower Link)

3x25mm BCS

(Rear Upper Link)

3x23mm BCS

(Rear Shock)

Install upper and lower suspension links to chassis Install rear shocks to fenders from top of chassis

3x23mm BCS
(Rear Shock)

3x25mm BCS

(Rear Upper Link)

3x15mm BCS

(Rear Lower Link)

3x25mm BCS

(Rear Upper Link)

3x15mm BCS

(Rear Lower Link)

3x23mm BCS
(Rear Shock)

TRAXXAS TRX-4 • 37

G. SUSPENSION & DRIVELINE INSTALLATION

SUSPENSION LINK BAG

2.6x8mm BCS (2)

Axle Ball Cup (2)

It is okay to slightly rock
horn to align ball cup.

Do not turn servo shaft
by hand or you could
damage the servo.

SAFE

NO! NO!

G7. Attach ball cups to dierential locking cables

1 2

Dierential

Cable

Axle Ball Cup

Screw ball cup on until all threads are hidden

43

2.6x8mm
BCS

2.6x8mm
BCS

DRIVELINE BAG

3x6mm BCS (4)

CV Cross Pin (4)

Stock Pin (4)

CV Cup (4)

CV Ball (4)

Short Female

Half Shafts (3)

Long Female

Half Shaft

Male Half Shafts (2)

CV Pin Retainer (4)

ACCESSORY

Option Part

8140 Long Arm Lift Kit
8140R Long Arm Lift Kit
8140X Long Arm Lift Kit

G8. Assemble front and rear driveshafts

Short half shaft assembly

CV Ball

Short Female

Half Shaft

CV Cross Pin

x3

Front driveshaft

Stock

Pin

CV Pin

Retainer

CV Cup

Ensure stock pins

are installed parallel

to each other.

Short Half

Shaft Assembly

Stock

CV Pin

Retainer

Pin

3x6mm

BCS

Short Half

Shaft Assembly

Male Half

Shaft

CV Cup

Long half shaft assembly

CV Ball

x1

Stock

Pin

CV Cup

Male Half

Short Half

Shaft Assembly

CV Pin

Retainer

Shaft

CV Cross Pin

Long Half Shaft

Assembly

3x6mm

BCS

Long Female

Half Shaft

Ensure stock pins

are installed parallel

to each other.

Stock

Pin

CV Cup

CV Pin

Retainer

Rear driveshaft

38 • TRAXXAS TRX-4

G. SUSPENSION & DRIVELINE INSTALLATION

DRIVELINE BAG

3x10mm Screw Pin (4)

G9. Install front and rear driveshafts

Front driveshaft installation

3x10mm

Screw Pin

3x10mm

Screw Pin

Rear driveshaft installation

3x10mm

Screw Pin

3x10mm

Screw Pin

Completed suspension & driveline installation

Check your assembly carefully.

TRAXXAS TRX-4 • 39

H. FINAL CHASSIS ASSEMBLY

SUSPENSION LINK BAG

M4x0.7 NL (4)

Wheels (4)

Tires with Foam Inserts (4)

Traxxas Ultra

Premium Tire Glue

(Part #6468 Sold Separately)

H1. Assemble wheels and tires; install on front and rear axles

x2x2

x4

ACCESSORY

Option Part

Wheel and tire options
available. See parts list.

BODY ACCESSORIES BAG

3x20mm BCS (4)

Body Post Crossmember (2)

Glue the tires to the wheels. Use your thumb to push
the side of the tire away from the wheel. Repeat at
four points around the wheel. Turn the wheel over and
repeat on the inside of the wheel.

H2. Install body post crossmembers on chassis

3x20mm

3x20mm

BCS

3x20mm

BCS

BCS

3x20mm

BCS

3x20mm

BCS

Note rotation
direction arrow
when installing.

M4x0.7 NL

3x20mm

BCS

40 • TRAXXAS TRX-4

H. FINAL CHASSIS ASSEMBLY

BODY ACCESSORIES BAG

3x18mm Screw Pin (4)

Front Body Mount (Short)

Rear Body Mount (Long)

H3. Install front and rear body mounts

Screw Pin

Adjust the body mount height

as necessary to t the body you

choose for your new TRX-4.

(Wheel wells may need to

be trimmed for body to t.)

3x18mm

Rear Body Mount

(Long)

Front Body Mount

(Short)

3x18mm

Screw Pin

BODY ACCESSORIES BAG

Front Bumper

Rear Bumper

Winch

Bumper D-ring (4)

2x12mm CS (4)

2.6x8mm BCS

4x5mm Yoke Pin (4)

ACCESSORY

H4. Assemble and install front and rear bumpers

Front bumper assembly

Winch

2.6x8mm BCS

2x12mm CS

Bumper
D-Rings

Rear bumper assembly

2x12mm CS

2x12mm CS

4x5mm

Yoke Pin

Adjust the bumper length as necessary to t

the body you choose for your new TRX-4.

4x5mm

Yoke Pin

Option Part

Bumper options
available. See parts list.

Bumper

D-Rings

2x12mm CS

TRAXXAS TRX-4 • 41

H. FINAL CHASSIS ASSEMBLY

BODY ACCESSORIES BAG

3x8mm BCS (8)

Rock Sliders (2)

H5. Attach rock sliders to left and right oor pans

3x8mm

BCS

3x8mm

BCS

3x8mm

BCS

3x8mm

BCS

Note Orientation:

Shorter ends towards front

Kit assembly complete

42 • TRAXXAS TRX-4

SAFETY PRECAUTIONS

WARNING! CAUTION! DANGER!

Your model is able to use LiPo

batteries. Charging and discharging batteries has the
potential for re, explosion, serious injury, and property damage if
not performed per the instructions. Before use, read and follow all
manufacturer’s instructions, warnings, and precautions. In addition,
Lithium Polymer (LiPo) batteries pose a SEVERE risk of re 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 14 use or handle LiPo battery packs
without the supervision of a knowledgeable and responsible adult.
Dispose of used batteries according to the instructions.

Important Warnings for users of Lithium Polymer (LiPo) batteries:

• LiPo batteries have a minimum safe discharge voltage threshold
that should not be exceeded. The electronic speed control 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 a Lithium Polymer (LiPo) balance charger with a balance
adapter port to charge LiPo batteries. Never use NiMH or NiCad­type chargers or charge modes to charge LiPo batteries. DO NOT
charge with a NiMH-only charger. The use of a NiMH or NiCad
charger or charge mode will damage the batteries and may cause
re and personal injury.

• 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 re.

• ALWAYS inspect your LiPo batteries carefully before charging.
Look for any loose leads or connectors, damaged wire insulation,
damaged cell packaging, impact damage, uid 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 re risk.

• DO NOT disassemble LiPo batteries or cells.

• DO NOT attempt to build your own LiPo battery pack from
loose cells.

Charging and handling precautions for all battery types:

• BEFORE you charge, ALWAYS conrm that the charger
settings exactly match the type (chemistry), specication, and
conguration of the battery to be charged.

FIRE HAZARD!

• 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 conguration, or batteries that
have missing or unreadable labels, preventing you from properly
identifying the battery type and specications.

• DO NOT exceed the maximum manufacturer recommended
charge rate.

• 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 re.

• While charging or discharging, ALWAYS place the battery (all types
of batteries) in a re retardant/re proof container and on a non­ammable 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
ammable material.

• ALWAYS charge batteries in a well-ventilated area.

• REMOVE ammable 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 re extinguisher nearby in case of re.

• DO NOT disassemble, crush, short circuit, or expose the batteries
to ame or other source of ignition. Toxic materials could be
released. If eye or skin contact occurs, ush 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.

• Allow the battery pack to cool o between runs (before charging).

• ALWAYS unplug the charger and disconnect the battery when not
in use.

• ALWAYS unplug the battery from the electronic speed control
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.

• ALWAYS store battery packs safely out of the reach of children
or pets. Children should always have adult supervision when
charging and handling batteries.

• Nickel-Metal Hydride (NiMH) batteries must be recycled or
disposed of properly.

• Always proceed with caution and use good common sense at all
times.

TRAXXAS TRX-4 • 43

SAFETY PRECAUTIONS

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 conict with or disrupt pedestrian or
vehicular trac.

• Never, under any circumstances, operate the model in crowds of
people. Your model is very fast and could cause injury if allowed to
collide with anyone.

• 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, battery, and speed control 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.

Speed Control

Your model’s electronic speed control (ESC) is an extremely powerful
electronic device capable of delivering high current. Please closely
follow these precautions to prevent damage to the speed control or
other components.

• Disconnect the Battery: Always disconnect the battery or batteries
from the speed control 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 rst before switching
on the speed control to prevent runaways and erratic performance.

• Don’t Get Burned: The ESC and motor can become extremely hot
during use, so be careful not to touch them until they cool. Supply
adequate airow for cooling.

• Use the Factory-Installed Connectors: Do not change the battery
and motor connectors. Improper wiring can cause re or damage to
the ESC. Please note that modied speed controls can be subject to a
rewiring fee when returned for service.

• No Reverse Voltage: The ESC is not protected against reverse polarity
voltage.

• No Schottky Diodes: External Schottky diodes are not compatible
with reversing speed controls. Using a Schottky diode with your
Traxxas speed control will damage the ESC and void the 30-day
warranty.

• Always adhere to the minimum and maximum limitations of the
speed control as stated in the specications table in the Owner’s
Manual. If your
ESC operates on two batteries, do not mix battery types and
capacities. Use the same voltage and capacity for both batteries.
Using mismatched battery packs could damage the batteries and
electronic speed control.

Recycling Traxxas Power Cell NiMH Batteries

Traxxas strongly encourages you to recycle Power Cell NiMH batteries
when they reach the end of their useful life. Do not throw batteries
in the trash. All Power Cell NiMH battery packs display the RBRC
(Rechargeable Battery Recycling Corporation) icon, indicating they are
recyclable. To nd a recycling center near you, ask your local hobby
dealer or visit www.call2recycle.org.

44 • TRAXXAS TRX-4

QUICK START GUIDE

The following guide is an overview of the procedures for getting your
model running. The complete manual for your model can be viewed
and downloaded by following the link on the cover of this manual or
by scanning the QR code. Please read this entire manual for complete
instructions on the proper use and maintenance of your model.

Read the Safety Precautions

For your own safety, understand where carelessness and misuse could
lead to personal injury and product damage.

Prepare Your Model

Selecting a charger and batteries for your model

Your model does not include a battery or charger. The speed control in
the model is compatible with both LiPo and NiMH batteries. One NiMH
or 2s LiPo battery equipped with a Traxxas High-Current Connector is
required. Traxxas Power Cell iD batteries are strongly recommended
for maximum performance and safer charging. The following chart
lists all the available Power Cell batteries for your model:

LiPo Batteries with iD

2849X 4000mAh 11.1V 3-Cell 25C LiPo Battery

2872X 5000mAh 11.1V 3-Cell 25C LiPo Battery

2843X 5800mAh 7.4V 2-Cell 25C LiPo Battery

2869X 7600mAh 7.4V 2-Cell 25C LiPo Battery

NiMH Batteries with iD

2923X Battery, Power Cell, 3000mAh (NiMH, 7-C at, 8.4V)

2940X Battery, Series 3 Power Cell, 3300mAh (NiMH, 7-C at, 8.4V)

2950X Battery, Series 4 Power Cell, 4200mAh (NiMH, 7-C at, 8.4V)

2960X Battery, Series 5 Power Cell, 5000mAh (NiMH, 7-C at, 8.4V)

WARNING: FIRE HAZARD!

Users of Lithium Polymer (LiPo) batteries must read the

Warnings and Precautions beginning on page 2. You
MUST use a LiPo charger for LiPo batteries or battery damage
with the potential for fire will result.

Install battery packs in the model

Install the battery pack with the battery
wires facing the rear of the model. Swing
the battery hold down towards the
chassis and snap (lock) the end into the
front hold-down retainer.
Note: The battery hold down can be
rotated on its pivot to accommodate
dierent height battery packs.

Compatible batteries:

• 6- and 7-cell NiMH • 2- and 3-cell LiPo

ATTENTION: USERS OF NiMH BATTERIES

Your model comes from the factory with Low-Voltage Detection
activated. Low-Voltage Detection is only for use with LiPo batteries. To
disable Low-Voltage Detection, refer to the EZ-Set Tips card attached
to your model, or see the “Electronic Speed Control Adjustments”
section of this guide.

Turning on Your Model

Turn on the transmitter

Always turn the transmitter on first, before turning on the model.
The transmitter’s LED will glow.

Plug the battery into the speed control

Align the + and – markings. Make certain the battery plug is
completely inserted.

Turn on the model

Press and release the EZ-Set button on the speed control. Do not hold
the button down. The speed control’s LED will glow.

1

2

3

Make certain you choose the correct type of charger for the batteries
you select. Traxxas recommends you choose a genuine Traxxas
EZ-Peak iD charger for safer charging and maximum battery life and
performance.

Charger

EZ-Peak Plus, 4-amp 2970 YES YES YES 3s

EZ-Peak Live, 8-amp 2971 YES YES YES 4s

EZ-Peak Dual, 8-amp 2972 YES YES YES 3s

Part

No.

NiMH

Compatible

LiPo

Compatible

Battery iDMax.

Cells

Install batteries in the transmitter

The transmitter requires 4 AA alkaline
or rechargeable batteries.

Always turn your

transmitter on rst.

Plug in the battery.

Before Operating Your Model

Turn on the model.

Check servo operation

Confirm the model’s wheels turn right and left when the transmitter
steering wheel is turned right and left. The front wheels should be
pointing straight ahead. If they are turned slightly, slowly adjust the
steering trim control on the transmitter until they are pointing straight
ahead.

Range test the radio system

With a friend’s help, check servo operation at the farthest distance you
plan to drive the model and confirm that there is no radio interference.

TRAXXAS TRX-4 • 45

QUICK START GUIDE

Operating Your Model

Unlock

T

U

R

N

R

I

G

H

T

Neutral
(full brake in
Crawl Mode)

(no brake in Crawl Mode)

High Gear

Low Gear

T

U

R

N

L

E

F

T

Note: Return the transmitter’s trigger to neutral and push up again
to activate reverse throttle unless the ESC is in Crawl Mode (see the

“Selecting a Throttle Mode” section for additional information).

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.

Shifting the High-Low Transmission

TRX-4’s High-Low Transmission is operated via the red rocker switch on
the transmitter grip.

Depress the lower part of the switch to engage High (for
greater speed).

Depress the upper part of the switch to engage Low

(for greater climbing torque).

Shifting from low gear into high gear can be performed at any speed.
For smoother operation, reduce the speed of the model before
shifting from high gear into low gear.

Operating the T-Lock Dierentials

The switch on top of the transmitter operates the front and rear
differential locking mechanism. The differentials can be locked or
unlocked at any time during most driving conditions. If the model
is stuck and there is wheelspin on a single wheel (one side of an
unlocked differential is freewheeling), then release the throttle and
allow the wheels to stop before locking the differential. Apply throttle
slowly until the differentials fully engage or disengage.

Switch rearward = both differentials unlocked. Best handling
and steering performance (smaller turning radius). This is the
best setting for most of your driving.

Switch centered = front differential locked. Enhanced climbing
ability and traction as both front tires work to pull the vehicle
forward. This is helpful for steep inclines. Turning radius will be
decreased. Reduced steering performance.

Diffs

Lock
Front
Diff

Lock
Both
Diffs

Brake/Reverse

Forward

Switch forward = both differentials locked. Maximum climbing
ability and traction. Reduced steering performance. On surfaces
with good traction, it is normal for the truck to appear to
alternately bind and slip the tires when attempting tight turns with
the differentials fully locked.

Locked differentials can be used at any time, but unlocking
the differentials greatly improves vehicle handling during
high-speed driving.

Transmitter Adjustments

Throttle Neutral Position

The trigger is set to 50/50 for equal movement in the throttle direction
and reverse/brake direction. Changing the setting to 70/30 will increase
the range of forward trigger travel and decrease brake trigger travel.

Note: You will need to reprogram your electronic speed control to recognize
the 70/30 setting. The default 50/50 setting is recommended.

Steering Trim

Turn the steering trim knob to precisely set
the steering neutral point. 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.

Cruise Control

The TRX-4 is equipped with cruise control,
which maintains vehicle speed for more
comfortable long-distance travel (such
as hiking on trails). To operate the cruise
control, accelerate to your desired speed and press the SET button
on the transmitter to lock the speed in. Your model will continue
at the set speed until you apply the brakes. You can fine tune the
speed to exactly match your pace by adjusting the multi-function
knob on the transmitter. Turn the knob clockwise to increase speed,
counterclockwise to reduce speed. You can accelerate and drive

faster with the cruise control set, and the vehicle will resume the set
speed when the throttle is released (Resume function).

The TQi transmitter has additional tuning features that can be accessed
by the MENU and SET buttons. For details, download the complete
manual by following the link on the cover of this manual, or by scanning

the QR code.

Electronic Speed Control Adjustments

ATTENTION: USING LiPo BATTERIES

When you turn your model on, the speed control’s status LED is
green, indicating that Low-Voltage Detection is activated to prevent over-
discharging of LiPo batteries. LiPo batteries are intended only for the

most advanced users that are educated on the risks associated with LiPo
battery use.

WARNING: FIRE HAZARD!

Do not use LiPo batteries in this vehicle with
Low-Voltage Detection disabled.

For NiMH battery users, follow these steps to
disable Low-Voltage Detection:

1. Turn the model on. Make sure the LED
on the speed control is on and green.

2. Press and hold the EZ-Set button for ten
seconds. The LED will turn off and then light red,
and the motor will beep three times.
Release the button.

3. Low-Voltage Detection is now DISABLED.

A

Green LED: Hold 10 seconds

B

3 beeps: LED shines red

46 • TRAXXAS TRX-4

QUICK START GUIDE

Selecting a Throttle Mode:
SPORT, RACE, TRAINING, TRAIL, OR CRAWL

1. Connect fully charged batteries to the model and turn on your
transmitter.

2. With the model off, press and hold the EZ-Set button until the LED
turns solid green, then solid red, and then begins blinking red. It
will blink once, then twice, then three times, then repeat.

One blink = Sport Mode is the default setting. It allows full forward

and reverse throttle.

Two blinks = Race Mode removes reverse throttle in case your

track does not allow it.

Three blinks = Training Mode will slow the model down by 50%

for young or inexperienced drivers.

Four blinks = Trail Mode is similar to Sport Mode, but with added

drag brake when the throttle trigger is at neutral. This is the default
setting for the TRX-4 and provides a good balance of smooth
driving and additional drag brake for descending hills.

Five blinks = Crawl Mode allows 100% brake (hill hold) with

immediate reverse when the throttle is at neutral. This setting is
best suited for technical courses where very precise movements are
required.

3. Release the EZ-Set button after the number of blinks for the mode
you wish to select. Note: If you missed the mode you wanted, keep the

EZ-Set button pressed down and the blink cycle will repeat.

4. The LED will blink and then turn solid green (Low-Voltage
Detection ACTIVE) or red (Low-Voltage Detection DISABLED).
The model is now ready to drive in the mode you have selected.

LED Codes and Protection Modes

• Slow Blinking Red: Low battery voltage. If you see
this code because a NiMH battery was connected to
an ESC with Low- Voltage Detection turned on, then
follow the calibration steps below to release the code
and change the ESC to NiMH mode.

• Fast Blinking Red and Green

code can appear when a fully charged NiMH battery
is connected to the ESC with Low-Voltage Detection
turned on. Follow the calibration steps below to
release the code and change the ESC to NiMH mode.

• Fast Blinking Red: Overtemp. Allow the ESC to
cool before continuing. The ESC can get too hot in
situations such as climbing and crawling in high gear,
which increases load on the system. Use low gear for
climbing and crawling.

: Overvoltage. This

TRAXXAS TRX-4 • 47

ASSEMBLY MANUAL

180601 KC2560-R03

MODEL 82016-4

6250 TRAXXAS WAY, McKINNEY, TEXAS 75070

1-888-TRAXXAS