Philips E-Maxx 3905 User Manual

MODEL 3905

owners manual

Introduction

3 Before You Proceed

4 Safety Precautions

5 Tools, Supplies and

Required Equipment

6 Anatomy of

the E-Maxx

7 Quick Start:

Getting Up

to Speed

8 Decorating

Your Model

9 The Traxxas

TQ Radio System

15 Adjusting the

Electronic Speed

Control

17 Driving Your Model

Thank you for purchasing the new Traxxas E-Maxx electric monster
truck. When it comes to gut-wrenching, wheelie-popping monster
torque, nothing comes close to E-Maxx. We are condent you will
appreciate the latest performance and appearance enhancements
that have been made to this legendary model. With tough twin
Titan® 550 motors and a powerful EVX-2 electronic speed control,
the E-Maxx is built for rock-stomping action. The new chassis and
water-resistant electronics are made to take abuse. Even innovative
technology from our top-of-the-line Revo® has found it’s way into
E-Maxx in the form of the patent-pending Torque-Control™ slipper
and sealed driveshafts.

This manual contains the instructions you will need to operate,
and maintain your model so that you can enjoy it for years to come.
We want you to feel condent that you own one of the best­performing models in the market and that it is backed by a team
of professionals who aim to provide the highest level of factory
support possible. Traxxas models are about experiencing total
performance and satisfaction, not just with your model, but also
with the company that stands behind it.

We know you’re excited about getting your new model on the
road, but it’s very important that you take some time to read
through the Owners Manual. This manual contains all the necessary
set-up and operating procedures that allow you to unlock the
performance and potential that Traxxas engineers designed into
your model. Even if you are an experienced R/C enthusiast, it’s

important to read and follow the procedures in this manual.

Traxxas Support

Traxxas support is with you every step of the
way. Refer to the next page to nd out how to
contact us and what your support options are.

Quick Start

This manual is designed with a Quick
Start path that outlines the necessary
procedures to get your model up
and running in the shortest time possible. If you are an
experienced R/C enthusiast you will nd it helpful and fast.
Be sure and read through the rest of the manual to learn
about important safety, maintenance, and adjustment
procedures. Turn to page 7 to begin.

20 Tuning Adjustments

25 Maintaining

Your Model

26 Troubleshooting

27 Index

2 • E-Maxx

Thank you again for going with Traxxas. We work hard every day
to assure you the highest level of customer satisfaction possible.
We truly want you to enjoy your new model!

Before You Proceed

Carefully read and follow all instructions in this and any
accompanying materials to prevent serious damage to your
model. Failure to follow these instructions will be considered
abuse and/or neglect.

Before running your model, look over this entire manual and
examine the model carefully. If for some reason you decide it is not
what you wanted, then do not continue any further. Your hobby

dealer absolutely cannot accept a model for return or exchange
after it has been run.

Warnings, helpful hints, & cross-references

Throughout this manual, you’ll notice warnings and helpful hints
identied by the icons below. Be sure to read them!

An important warning about personal safety or avoiding
damage to your model and related components.

Special advice from Traxxas to make things easier
and more fun.

Refers you to a page with a related topic.

Support

If you have any questions about your model or its operation,
call the Traxxas Technical Support line toll-free at:
1-888-TRAXXAS (1-888-872-9927)*

Technical support is available Monday through Friday from 8:30am
to 9:00pm central time. Technical assistance is also available at
www.Traxxas.com. You may also e-mail customer support with your
question at [e-mail]. Join thousands of registered
members in our online community at Traxxas.com.

Traxxas offers a full-service, on-site repair facility to handle any
of your Traxxas service needs. Maintenance and replacement
parts may be purchased directly from Traxxas by phone or online
at www.BuyTraxxas.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!

Traxxas
1100 Klein Road
Plano, Texas 75074
Phone: [phone]
Toll-free 1-888-TRAXXAS

Traxxas U.K.
P.O. Box 1128
Winterbourne, Bristol
BS36-2SH
England
Phone: [phone]

Internet
www.Traxxas.com
E-mail: [e-mail]

Entire contents ©2007 Traxxas.
Traxxas, Ready-To-Race, Ready­To-Win, E-Maxx and ProGraphix
are trademarks or registered
trademarks of Traxxas. Other
brand names and marks are
the property of their respective
holders and are used only for
purposes of identication. No
part of this manual may be
reproduced or distributed in print
or electronic media without the
express written permission of
Traxxas. Specications are subject
to change without notice.

*Toll-free support is available to U.S. residents only.

E-Maxx • 3

Safety Precautions

bluehighway font

Choose the Model That is Right For You. For individual Models

No previous experience with radio controlled models is required.
Models require a minimum of setup, maintenance, or support equipment.

Previous experience with radio controlled models is recommended.
Models require a higher level of setup, maintenance, or support equipment.

No previous experience with radio controlled models is required.
Model requires a minimum of setup, maintenance, or support equipment.

Previous experience with radio controlled models is recommended.
Model requires a higher level of setup, maintenance, or support equipment.

BELOW TEXT HAS BEEN UPDATED on 3-14-07
Kent wants maintenance text to be at the END of the paragraph.-- KB

All instructions and
precautions outlined in this
manual should be strictly
followed to ensure safe
operation of your model.

This model is not intended
for use by children under
8 years of age without the
supervision of a responsible
and knowledgeable adult.

Previous experience with
radio controlled models
is recommended. Models
require a higher level of
setup, maintenance, or
support equipment.

4 • E-Maxx

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 traf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 motors, batteries, 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.

Most importantly, use good common sense at all times.

Batteries and Battery Charging

Your model uses rechargeable batteries that must be handled with
care for safety and long battery life. Make sure to read and follow all
instructions and precautions that were provided with your battery
packs and your charger. It is your responsibility to charge and care
for your battery backs properly. In addition to your battery and
charger instructions, here are some more tips to keep in mind.

Never leave batteries to charge unattended.
Remove the batteries from the model while charging.
Always unplug the batteries from the electronic speed control

when the model is not in use and when it is being stored
or transported.

Allow the battery packs to cool off between runs

(before charging).

Do not use battery packs that have been damaged in any way.

Do not use battery packs that have damaged wiring, exposed

wiring, or a damaged connector.

Children should have responsible adult supervision when

charging and handling batteries.

Speed Control

Disconnect the Batteries: Always disconnect the batteries from the

speed control when not in use.

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 heat sink can get extremely hot, so be

careful not to touch it until it is cool. Supply adequate airow
for cooling.

Use Stock Connectors: If you decide to change the battery

or motor connectors, only change one battery or motor connector
at a time. This will prevent damage from accidentally mis-wiring
the speed control. Please note that modied speed controls can
be subject to a rewiring fee when returned for service. Removing
the battery connector on the speed control or using connectors
with no reverse-polarity protection on the speed control will void
the product’s warranty.

Insulate the Wires: Always insulate exposed or damaged wiring

with heat shrink tubing to prevent short circuits

Always Use Heat Sinks: Three heat sinks are factory-installed on

the speed control and must be used for maximum cooling and
performance.

No Reverse Voltage: The speed control is not protected against

reverse polarity voltage. When changing the battery and/or
motor, be sure to install the same type of connectors to avoid
reverse polarity damage to the speed control. Removing the
battery connectors on the speed control or using the same-gender
connectors on the speed control will void the product’s warranty.

Do Not Let the Transistor Tabs Touch: Never allow the three

separate transistor banks to touch each other or any exposed
metal. This will create a short circuit and damage the speed
control. (For example, laying a metal tool across the heat sinks can
damage the speed control.)

No Schottky Diodes: External Schottky diodes are not compatible

with reversing speed controls. Using a Schottky diode with the
EVX-2 will damage the ESC and void the 30-day warranty.

Tools, Supplies and Required Equipment

Your model comes with a set of specialty metric tools. You’ll need to purchase other items, available from your hobby dealer, to operate
and maintain your model.

Supplied Tools and Equipment

2.0mm “T” wrench 8mm/5mm wrench

Suspension multi-tool

Required Tools and Equipment (sold separately)

1.5mm “L” wrench

Antenna nut wrench

2.5mm “L” wrench

Pre-load spacers and shock pistons

(on parts tree) see page 20

Body clips

Universal wrench

Foam blocks (battery spacers)

see page 12

For more information on
batteries, see Use the Right
Batteries on page 10.

A peak-detecting charger
is recommended for best
performance and longest
battery life. For more
information, see Use the
Right Charger on page 12.

Recommended Equipment

These items are not required
for the operation of your
model, but are a good idea to
include in any R/C toolbox:

• Safety glasses

• Thin, hobby-quality
cyanoacrylate instant tire
glue (CA glue)

• Hobby knife

• Side cutters and/or needle
nose pliers

• Philips screwdriver

• Soldering iron

8 AA alkaline

batteries

Warning: Lithium Polymer (LiPo) batteries should not be used with the EVX-2. The EVX-2 electronic speed control is not equipped with low-voltage detection.

Two NiMH battery packs (7.2V 6-cell

or 8.4-volt 7-cell [recommended])

(peak detecting type recommended - see sidebar)

NiMH battery charger

E-Maxx • 5

Anatomy of the E-Maxx

Half Shaft

Toe Link
(Turnbuckle)

Electronic Speed
Control (EVX-2)

Rear
Body Mount

Rear
Shock Tower

Skid Plate

Rear
Bumper

Steering Servo

Slipper Clutch Access Plug

Pinion Gear (left side)

Battery Hold-Down

Battery Compartment

Motors (Titan)

Hex Hub

Pivot Ball

Axle Carrier

Toe Link

(Turnbuckle)

Suspension
Arm (Front)

Front Body

Mount

Receiver

Box

Skid Plate

Front

Bumper

Rear
Bulkhead

Rear
Differential

Suspension
Arm (Rear)

6 • Traxxas

Transmission

Chassis

Spur Gear

Battery Compartment

Antenna Mount

Battery Hold-Down

Steering Servo

Front

Differential

Front

Bulkhead

Front

Shock Tower

Ultra Shock

(Oil Damper)

™

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
corners of Quick Start pages.

1. Read the safety precautions on page 4 9. Detail your model • See page 8

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

2. Charge the battery packs • See sidebar, page 12 10. Drive your model • See page 17

Fully charge two 7.2 or 8.4-volt battery packs (not included). Charge your
batteries now so it will be ready when you finish the other setup procedures.

3. Install the antenna • See page 11 11. Maintaining your model • See page 25

Install the antenna mast in the model. Follow these critical steps to maintain the performance

4. Install batteries in the transmitter • See page 11

The transmitter requires 8 AA alkaline or rechargeable batteries.

5. Install battery packs in the model • See page 12

Your model requires two fully charged 7.2 or 8.4-volt battery packs
(not included).

Apply other decals if desired.

Driving tips and adjustments for your model.

of your model and keep it in excellent running condition.

The Quick Start Guide is
not intended to replace the
full operating instructions
available in this manual.
Please read this entire
manual for complete
instructions on the proper
use and maintenance of
your model.

6. Turn on the radio system • See page 14

Make a habit of turning the transmitter on rst, and off last.

7. Check servo operation • See page 14

Make sure the steering servos are working correctly.

8. Range test the radio system • See page 14

Follow this procedure to make sure your radio system works properly
at a distance and that there is no interference from outside sources.

Look for the Quick Start
logo at the bottom of
Quick Start pages.

E-Maxx • 7

Decorating your Model

Applying The Decals

The main decals for your model

have been applied at the factory.
The decals are printed on self-
adhesive clear mylar and are
die-cut for easy removal. Use a
hobby knife to lift the corner of a
decal and lift it from the backing.
To apply the decals, place one end
down, hold the other end up, and
gradually smooth the decal down
with your nger as you go. This will
prevent air bubbles. Placing both
ends of the decal down and then
trying to smooth it out will result in
air pockets.

Look at the photos on the box for

typical decal placement.

Tire Gluing

The factory tires on your E-Maxx are already glued to the rims. The
tires must be glued to the rims to prevent the rims from spinning
inside the tires. The instructions here are provided to show you how
to glue replacement tires to the rims in the future. Use CA tire glue
available from your local hobby dealer. You can glue the tires without
removing the wheels from the truck. For clarity, these instructions
show the process with the wheels removed.

1. Remove a wheel from E-Maxx using the larger (8mm) end of the
universal wrench.

2. Use your thumb to push the side
of the tire away from the rim. Place
one or two drops of CA glue into
the opening and release the tire.
Capillary action will draw the glue
around the bead of the tire.

3. Repeat step two at four or five
points around the rim, until the tire is completely secured to the rim.
Turn the rim over and repeat the process for the inside of the rim/
tire. Repeat for the other three wheels.

4. Reinstall the wheels, make sure none of the axle pins have fallen out
from behind the hex hubs.

8 • E-Maxx

16.8V ESC

WATERPROOF

The Traxxas TQ Radio System

CH.2

CH.1

16.8V ESC

WATERPROOF

Your model is equipped with the Traxxas TQ Radio System.

The Traxxas TQ Radio System is a 2-channel system that provides
high-power output up to a quarter mile. Model 3905 uses two steering
servos and an electronic speed control. The receiver is equipped with
four channels and dual channel 1 outputs for the steering servos.

TQ Transmitter

Antenna

Throttle Trim

Steering Trim

Throttle
Trigger

Throttle Neutral Adjust

Steering Wheel

Servo Reversing

Switch

Wiring Diagram

Channel 1
Steering Servos

Antenna

Motors
(Titan

Crystal

Receiver

High-Current
Connector

BATT/CH4 and CH3 are not used

Channel 2
EVX-2 Electronic
Speed Control

EVX-2 Electronic Speed Control

To Motor

High-Current

Battery Connector

EVX-2 Wiring Diagram

®

)

Power Switch

Battery Compartment

Power Indicator

Heat Sinks

LED

EZ-Set Button

E-Maxx • 9

The Traxxas TQ Radio System

Channel

Frequency

Band

Flag

Color

Traxxas
Part No.

1 26.995 Brown 2031

2 27.045 Red 2032

3 27.095 Orange 2033

4 27.145 Yellow 2034

5 27.195 Green 2035

6 27.255 Blue 2036

Use the Right Batteries

Your transmitter uses AA
batteries. Use new alkaline
batteries, or rechargeable
batteries such as NiCad
or NiMH (Nickel Metal
Hydride) batteries in your
transmitter. Make sure
rechargeable batteries are
fully charged according
to the manufacturer’s
instructions.

If you use rechargeable
batteries in your
transmitter, be aware
that when they begin
to lose their charge, they
lose power more quickly
than regular alkaline
batteries.

Caution: Discontinue
running your model at the
rst sign of weak batteries
(ashing red light) to avoid
losing control.

10 • E-Maxx

Radio System Terminology

Please take a moment to familiarize yourself with these radio­system terms. They will be used throughout this manual.

BEC (Battery Eliminator Circuit) - The BEC can either be in the

receiver or in the ESC. This circuit allows the receiver and servos
to be powered by the main battery pack in an electric model. This
eliminates the need to carry a separate pack of 4 AA batteries to
power the radio equipment.

Channel - The 27 MHz frequency band is divided into 6 channels

so that up to six models can be operated simultaneously. Each
channel is referred to by its ag color and channel number, as
shown below.

Clearing your frequency - A routine, verbal check to make sure

nobody else in your area is operating on the same channel.
Always clear your frequency by calling out your channel number
before operating your model. Wait or move to another area if your
channel is already being used.

Crystal (X-tal) - The plug-in device that determines which channel

the radio system will operate on. For each channel, there are two
crystals, one for the receiver and one for the transmitter. Of those
two crystals, the one marked with the lower number (.455 MHz
lower) must be inserted into the receiver.

ESC (Electronic Speed Control) - An electronic speed control is

the electronic motor control inside the model. The EVX-2 uses
MOSFET power transistors to provide precise, digital proportional
throttle control. Electronic speed controls use power more
efciently than mechanical speed controls so that the batteries
run longer. An electronic speed control also has circuitry that
prevents loss of steering and throttle control as the batteries lose
their charge.

Frequency band - The radio frequency used by the transmitter to

send signals to your model. All Traxxas RTR models operate on a
27 MHz frequency band.

mAh – Abbreviation for milliamp hour. A measure of the capacity of

the battery pack. The higher the number, the longer the battery
will last between recharges.

Neutral position - The standing position that the servos seek when

the transmitter controls are at the neutral setting.

NiCad - Abbreviation for nickel-cadmium. The original rechargeable

hobby pack, NiCad batteries have very high current handling,
high capacity, and can last up to 1000 charging cycles. Good
charging procedures are required to reduce the possibility of
developing a “memory” effect and shortened run times.

NiMH - Abbreviation for nickel-metal hydride. Rechargeable NiMH

batteries offer high current handling, and much greater resistance
to the “memory” effect. NiMH batteries generally allow higher
capacity than NiCad batteries. They can last up to 500 charge
cycles. A peak charger designed for NiMH batteries is required for
optimal performance.

Receiver - The radio unit inside your model that receives signals

from the transmitter and relays them to the servos.

Servo - Small motor unit in your model that operates the steering

mechanism.

Transmitter - The hand-held radio unit that sends throttle and

steering instructions to your model.

Trim - The ne-tuning adjustment of the neutral position of the

servos, made by adjusting the throttle and steering trim sliders on
the face of the transmitter.

Thermal Shutdown Protection - Temperature sensing electronics

are used in the ESC to detect overloading and overheating of the
transistor circuitry. If excessive temperature is detected, the unit
automatically shuts down to prevent damage to the electronics.

2-channel radio system - The TQ radio system, consisting of

the receiver, the transmitter, and the servos. The system uses
two channels: one to operate the throttle and one to operate
the steering.

550 and 540 - These numbers refer to the size of the motor. 550

motors have armatures that are 30% longer than 540 motors.

The Traxxas TQ Radio System

CH.2

CH.1

Installing Transmitter Batteries

Your TQ transmitter uses 8 AA batteries (see sidebar, page 10).
The battery compartment is located in the base of the transmitter.

1. Remove the battery compartment door by pressing the tab and
lifting the door up.

2. Install the batteries in the correct orientation as indicated in the
battery compartment.

3. Reinstall the battery door and snap it closed.

4. Turn on the transmitter and check the power indicator for a solid
red light.

If the power indicator light ashes, then the transmitter batteries
are weak, discharged or possibly installed incorrectly. Replace with
new or freshly charged batteries. The power indicator light does not
indicate the charge level of the battery pack installed in the model.

Setting up the Antenna

1. Locate the black antenna wire that
exits the receiver box.

2. Pull the wire straight with your
ngers and then insert the end
of the wire into one end of the
antenna tube (the antenna tube,
tip, crimp nut and sleeve are
located in the documents bag).
Push the wire all the way through
the antenna tube.

3. Insert the base of the tube into
the antenna post. Take care not to
crimp the antenna wire.

4. Slide the crimp nut over the
antenna tube and screw it onto
the antenna post. Use the supplied
tool to tighten the crimp nut on
the post just until the antenna
tube is securely in place. Do not
over tighten or crush the antenna
wire against the chassis.

5. Fold the top of the antenna wire
over the top of the antenna tube.
Slide the antenna sleeve over the
tube to retain the antenna wire.
Now slide the antenna tip onto the
top of the antenna tube. Never cut
or shorten the antenna wire.

6. On the transmitter, always fully
extend the telescoping antenna
when running your model. Make a
habit of holding the transmitter so
the antenna points straight up.

Antenna

Sleeve

Antenna

Wrench

Antenna

Tip

Antenna

Tube

Antenna

Crimp Nut

If the power indicator
doesn’t light red, check the
polarity of the batteries.
Check rechargeable
batteries for a full charge.

Spray a little window cleaner
on the antenna wire to make
it easier to push through the
antenna tube.

If there are any kinks in the
black antenna wire, it will
be more difcult to push
through the antenna tube.
Pull the wire straight by
sandwiching it between your
thumb and index nger and
running your ngers along
the length of the wire (with
medium pressure).

Don’t shorten the length of
the antenna wire. Its length
is tuned to the frequency
band; cutting it could
severely shorten the radio
system’s range.

See page 19 for more
information about the
receiver box and maintaining
a watertight seal.

Antenna

Post

E-Maxx • 11

The Traxxas TQ Radio System

Use the Right Charger

The most convenient type
of charger is an AC peak-
detecting charger that plugs
directly into an AC wall
outlet. It contains special
peak-detection circuitry
that automatically shuts the
charger off when the battery
is fully charged.

If you’re using a 15-minute
timed charger, always fully
discharge the battery pack
before each charge. Some
high mAh battery packs
(1500 mAh or higher) require
more than the standard 15
minutes of charge time. If
the battery pack is cold after
15 minutes of charging,
add another 5 minutes of
charge time. Closely monitor
the battery pack and stop
charging it when it begins
to feel warm to the touch.
Never leave a battery
charging unattended.
Always follow charger
manufacturer’s instructions.

Warning: Lithium Polymer
(LiPo) batteries should not
be used with the EVX-2. The
EVX-2 is not equipped with
low-voltage detection.

Installing Battery Packs

The E-Maxx requires two fully charged 7.2 or 8.4-volt (stick style)
NiMH battery packs. These batteries are not included with the
model. For the best performance, use 7-cell battery packs. When
using 6-cell battery packs, install the supplied foam block (spacer)
into the front of the battery compartment. The spacers are located
in your instructions package. The spacers are shaped to conform
to the chassis. There is a right and a left. Test t them to conrm
their location. Remove the backing from the self adhesive strips and
secure them to the front of the battery compartments.

Using Different Battery Congurations

The battery hold-downs are
capable of accommodating
either side-by-side racing
style packs or the more
common stick packs. The
battery compartments
are congured for stick
packs from the factory.
The number on each
side of the hold down
indicates the battery
height in millimeters
that hold-down can
accommodate. Note that one side is labeled “25” and other side is
labeled “23”. The 25mm side is for use with typical stick type battery
packs. If you are using side-by-side racing packs,
down over to the 23mm side and use it on the opposite side of the
chassis. Accessory hold downs and foam (part #3927X) are available to
accommodate larger battery packs. See the 3905 E-Maxx parts list for
more information.

“25” - Standard stick packs

“23” - Side-by-side packs

simply flip the hold-

25mm side: Standard

NiMH stick pack setup

Battery Installation

1. Remove the battery hold-

down by pressing on the
release tab and lifting out
the hold-down.

2. Install the battery pack with
the battery wires facing
the rear of the model. Your
model includes foam blocks
which should be installed
behind 6-cell batteries for a
more secure fit.

Foam
Block

3. Insert the tabs of the battery

hold-down into the slots in
the rear hold-down retainer
(A). Swing the battery hold
down towards the chassis

Release Tab

6-cell Battery Install

Release Tab

7-cell Battery Install

and snap (lock) the end into the front hold-down retainer (B).

The Traxxas High Current Connector

Your model is equipped with the Traxxas
High-Current Connector. Standard connectors
restrict current ow and are not capable of
delivering the power needed to maximize the
output of the EVX-2. The Traxxas connector’s
gold-plated terminals with a large contact surfaces ensure positive
current ow with the least amount of resistance. Secure, long­lasting, and easy to grip, the Traxxas connector is engineered to
extract all the power your battery has to give.

To run this model, your batteries must be equipped with Traxxas
High-Current Connectors. Batteries can either be purchased new
with Traxxas connectors installed or Traxxas connectors can be
purchased to install on battery packs you already own. See sidebar
on page 13 for packages available from your hobby dealer.

12 • E-Maxx

23mm side: Side-by-side

NiMH pack setup

The typical Molex style connector is inadequate for
use in your model. It creates resistance that becomes
a bottleneck to current ow. If your battery pack

is equipped with a Molex connector, it must be
replaced with a Traxxas High-Current Connector to
mate with the EVX-2 electronic speed control.

Molex

connector

Steering

T

U

R

N

L

E

F

T

T

U

R

N

R

I

G

H

T

Brake/Reverse

Neutral

Accelerate

CH.2

CH.1

The Traxxas TQ Radio System

CH.2

CH.1

TQ Radio System Controls

TQ Radio System Adjustments

In addition to the electronic throttle and steering trim controls,
your radio system features throttle neutral adjustment and servo
reversing switches. These are preset at the factory and should

not require further adjustment.

Throttle Neutral Adjustment

The throttle neutral adjustment is located on the transmitter face
and controls the forward/reverse travel of the throttle trigger.
Change the adjustment by pressing the button and sliding it to
the desired position.

There are two settings available:
50/50: Allows equal travel for both

acceleration and reverse.

70/30: Allows more throttle travel (70%)

and less reverse travel (30%).

Note: If you change throttle travel, you
will need to reprogram the electronic
speed control.

Electronic Throttle Trim

The electronic throttle trim located on the face of the transmitter
adjusts the neutral (center) point of the electronic speed control.
This control has been preset for you at the factory.

Electronic Steering Trim

The electronic steering trim located on the face of the transmitter
adjusts the neutral (center) point of the steering servos when the
servos are at rest. Adjust this control to make the model drive
straight with no steering input at the wheel.

Servo Reversing Switches

The servo reversing switches are located on the front of the
transmitter, next to the on/off switch. Moving a switch reverses
the direction of the corresponding servo.

Each switch corresponds to a channel, as shown below. For
example, if you turn the steering wheel to the right and your
wheels turn left, you would move the Channel 1 switch to
correct the servo direction. It may be necessary to adjust the
corresponding trim control after moving a switch.

Channel

1

2

Default Setting

Servo

Steering

Throttle

Don’t push the transmitter
antenna down from the
top. Pull it down from the
bottom, one segment at a
time, to prevent binding and
kinking the antenna mast.

The following Traxxas High
Current Connector packages
are available from your
hobby dealer. When using
adapters, be careful not to
exceed the current rating of
the Molex connector.

Part #3060
Single Male/Female

Part #3061
Male Charge Adapter

Part #3062
Female Charge Adapter

E-Maxx • 13

Part #3080
2-Pack Female

Part #3070
2-Pack Male

Channel 1

Brown

Channel 2

Red

Channel 3

Orange

Channel 4

Yellow

Channel 5

Green

Channel 6

Blue

CH.2

CH.1

The Traxxas TQ Radio System

Remember, always turn the
TQ transmitter on rst and
off last to avoid damage to
your model.

Your speed control was
adjusted to the radio from
the factory. It is possible
for the throttle trim control
on the transmitter to have
moved during transit
or while handling the
transmitter. If the motors
run when the model is
switched on, then move the
throttle trim control on the
transmitter until the motors
stop. If anything more
than a slight adjustment of
the throttle trim control is
required, then you should
readjust your speed control.
Refer to the adjustments
section on page 15.

When rechargeable batteries
begin to lose their charge,
they will fade much faster
than alkaline dry cells. Stop
immediately at the rst sign
of weak batteries. Never turn
the transmitter off when the
battery pack is plugged
in. The model could run out
of control.

14 • E-Maxx

TQ Radio System Rules

Each time you prepare to run your model, you

must clear your frequency to be sure no one
else in the area is using the same channel as
you. There are six possible channels, numbered
1 through 6. Each is represented by a color.
Look at the crystal plugged into the back of
your transmitter to determine which channel
your model is assigned to.

Always turn your TQ transmitter on rst and off

last. This procedure will help to prevent your model
from receiving stray signals from another transmitter,
or other source, and running out of control.

Always have the transmitter turned on before plug in

the battery.

Always use new or freshly charged batteries for the radio

system. Weak batteries will limit the range of the radio signal
between the receiver and the transmitter. Loss of the radio
signal can cause you to lose control of your model.

1

2

3

4. The on/off switch is integrated into the speed control. With
the transmitter on, press the EVX-2 set button for ½ second, until
the LED shines GREEN, then immediately release the button. This
turns the model on (see page 15 for more on EVX-2 setup and
operation). To turn the EVX-2 off, press the set button until the
green LED turns off. Always disconnect your batteries when the

model is not in use.

5. Turn the steering wheel on the transmitter back and forth and
check for rapid operation of the steering servos. Also, check that
the steering mechanism is not loose or binding. If the steering
operates slowly, check for weak batteries.

6. When looking down at model, the front wheels should be
pointing straight ahead. If the wheels are turned slightly to
the left or right, slowly adjust the steering trim control on the
transmitter until they are pointing straight ahead.

7. Operate the throttle trigger to ensure that you have full forward
and reverse operation, and that the motors stop when the
throttle trigger is at neutral.

8. Once adjustments are made, turn off your model, followed by
the hand held transmitter.

Range-Testing the TQ Radio System

Before each running session with your model, you should range­test your radio system to ensure that it operates properly.

1. Turn on the radio system and check its operation as described

Always turn your

transmitter on rst.

Plug in the battery.

Turn on the model.

see TQ Radio System Setup, step 4.

TQ Radio System Setup

The TQ Radio System was pre-adjusted at the factory. The
adjustment should be checked, before running the model,
in case of movement during shipping. Here’s how:

1. Fully extend the chrome antenna mast on the transmitter and
turn the switch on. The red indicator light on the transmitter
should be solid red (not ashing).

2. Elevate the model so that all four tires are off the ground.
If you are holding the model, grip it rmly. Make sure your
hands are clear of the moving parts of the model.

3. Plug the battery pack in the model into the speed control.

in the previous section.

2. Have a friend hold the model. Make sure hands and clothing are
clear of the wheels and other moving parts on the model.

3. Make sure your transmitter antenna is fully extended, and then
walk away from the model with the transmitter until you reach
the farthest distance you plan to operate the model.

4. Operate the controls on the transmitter once again to be sure
that the model responds correctly.

5. Do not attempt to operate the model if there is any problem
with the radio system or any external interference with your
radio signal at your location.

Adjusting the Electronic Speed Control

The EVX-2 electronic speed control is factory set and should not require
any adjustments. These instructions are provided for your reference.

Transmitter Adjustments for the EVX-2 ESC

Before attempting to program your EVX-2, it is important to make
sure your TQ transmitter is properly adjusted (set back to the factory
defaults). Otherwise, you may not get the best performance from your
speed control.

The transmitter should be adjusted as follows:

1. Set the throttle neutral switch to the 50/50 setting. This adjusts
the transmitter’s throttle trigger throw to 50% for throttle and
50% for braking and reverse.

2. Set the throttle trim control to the middle “0” setting.

3. Set the Channel 2 servo reversing switch to the left position. Do
not change the position of any of the servo reversing switches
after programming the EVX-2.

4. You are now ready to program your speed control.

Setup Programming (Calibrating your ESC and transmitter)
Read through all of the following programming steps before you
begin. If you get lost during programming or receive unexpected
results, simply unplug the battery, wait a few seconds, plug the battery
back in, and start over.

1. Disconnect each of the motor wires between

A

the EVX-2 and the motors. This is a precaution
to prevent runaway when the speed control is
turned on before it is programmed.

2. Connect two fully charged battery packs to the
EVX-2.

B

Green then Red

3. Turn on the transmitter (with
the throttle at neutral).

4. Press and hold the EZ-Set
button (A). The LED will rst
turn green and then red.
Release the EZ-Set button.

Once Red

C

5. When the LED blinks RED ONCE.
Pull the throttle trigger to the
full throttle position and hold it
there (B).

Twice Red

6. When the LED blinks RED TWICE. Push the

D

throttle trigger to the full reverse and hold it
there (C).

7. When the LED turns solid GREEN, programming is
complete. The LED will continuously shine green

Solid Green

indicating the EVX-2 is on and at neutral (D).

EVX-2 Operation

To operate the speed control and test the programming, place the
vehicle on a stable block or stand so all of the driven wheels are off the
ground. Reconnect the motor wires. Always make sure that objects and
ngers are clear of the wheels.

1. With the transmitter on, press the EZ-Set button for ½ second,
until the LED shines GREEN, then immediately release the button.
This turns on the EVX-2. If you press and release too quickly, you
may hear the steering servos jump but the LED may not stay
on. (Note: If the throttle is not at neutral or if the throttle trim
has been altered, the LED will turn off after one second and the
wheels may begin to drive.)

2. Apply forward throttle. The LED will turn off until full throttle
power is reached. At full throttle, the led will shine GREEN.

3. Move the trigger forward to apply the brakes. Note that braking
control is fully proportional. The LED will turn off until full braking
power is reached. At full brakes, the LED will shine GREEN.

4. Return the throttle trigger to neutral. The LED will shine GREEN.

5. Move the throttle trigger forward again to engage reverse
(Prole #1). The LED will turn off. Once full reverse power is
reached, the LED will shine GREEN.

6. To stop, return the throttle trigger to neutral. Note that there is
no programmed delay when changing from reverse to forward.
Use caution to avoid slamming the speed control from reverse
to forward. On high-traction surfaces, this could result in
transmission or driveline damage.

7. To turn the EVX-2 off, press the EZ-Set button until the green LED
turns off.

EVX-2 Specications

Input voltage:

6 to 14-cells
(7.2 to 16.8 volts DC)

Motor limit:

12-turns (550)

Continuous current:

30A

Peak current :

180A

BEC voltage:

6.0V DC

Transistor type:
MOSFET

Motor/Battery Wiring:

14-gauge

Protection:

Thermal shutdown

EVX-2 Wiring Diagram

E-Maxx • 15

Adjusting the Electronic Speed Control

Patent Pending Training
Mode (Prole #3) reduces
forward and reverse throttle
by 50%. Training Mode
is provided to reduce the
power output allowing
beginning drivers to better
control the model. As driving
skills improve, simply change
to Sport or Race Mode for
full-power operation.

Tip For Fast Mode Changes

The EVX-2 is set to Prole 1
(Sport Mode) as the default.
To quickly change to Prole 3
(Training Mode), with the
transmitter on, press and hold
the SET button until the light
blinks red three times and then
release. For full power, quickly
change back to Prole 1 (Sport
Mode) by pressing and
holding the SET button until
the light blinks red one time
and then releasing.

Thermal Shutdown Protection

The EVX-2 is equipped with thermal shutdown protection to guard
against overheating caused by excessive current ow. If the operating
temperature exceeds safe limits, the EVX-2 will automatically shut
down and the EVX-2 LED will ash red. The LED on the face of the EVX­2 will continuously ash red, even if the throttle trigger is moved back
and forth. After the speed control cools down to a safe level,
the LED will continuously shine green. The EVX-2 will once again
function normally.

EVX-2 Prole Selection

The speed control is factory set to Prole #1. To change the prole,
follow the steps on described below. The speed control should be
connected to the receiver and battery, and the transmitter should be
adjusted as described previously. The proles are selected by entering
the programming mode.

EVX-2 Prole Description
Prole #1 (Sport Mode): 100% Forward, 100% Brakes, 100% Reverse
Prole #2 (Race Mode): 100% Forward, 100% Brakes, No Reverse
Prole #3 (Training Mode): 50% Forward, 100% Brakes, 50% Reverse

Selecting Sport Mode (Prole #1)

1. Connect two fully charged battery
packs to the EVX-2 and turn on your

A

B

transmitter.

2. With the EVX-2 off, press and hold
the EZ-Set button until the light
turns solid green, then solid red and

Green to Red to Off

C

One blink Red

D

then begins blinking red (indicating
the Prole numbers).

3. When the light blinks red once,
release the EZ-Set button.

Release

Solid Green

4. The light will then turn green and the model is ready to drive.

Selecting Race Mode (Prole #2)

1. Connect two fully charged battery
packs to the EVX-2 and turn on your

A

B

transmitter.

2. With the EVX-2 off, press and hold
the EZ-Set button until the light
turns solid green, then solid red and

Green to Red to Off

C

Two blinks Red

D

then begins blinking red (indicating
the Prole numbers).

3. When the light blinks red twice,
release the EZ-Set button.

Release

Solid Green

4. The light will then turn green and the model is ready to drive.

Selecting Training Mode* (Prole #3)

1. Connect two fully charged battery
packs to the EVX-2 and turn on your

A

B

transmitter.

2. With the EVX-2 off, press and hold
the EZ-Set button until the light
turns solid green, then solid red and

Green to Red to Off

C

Three blinks Red

D

then begins blinking red (indicating
the Prole numbers).

3. When the light blinks red three
times, release the EZ-Set button.

Release

Solid Green

4. The light will then turn green and the model is ready to drive.

Note: If you missed the mode you wanted, keep the EZ-Set button
pressed down and the blink cycle will repeat until a Mode is selected.

16 • E-Maxx

*Patent-pending

Driving your Model

Now it’s time to have some fun! This section contains instructions on
driving and making adjustments to your model. Before you go on, here
are some important precautions to keep in mind.

Allow the model to cool for a few minutes between runs. This is
particularly important when using high capacity battery packs that
allow extended periods of running. Monitoring temperatures will
extend the lives of the batteries and motors..

Do not continue to operate the model with low batteries or you
could lose control of it. Indications of low battery power include
slow operation and sluggish servos (slow to return to center). Stop
immediately at the rst sign of weak batteries. When the batteries in
the transmitter become weak, the red power light will begin to ash.
Stop immediately and install new batteries.

Do not drive the model at night, on public streets, or in large crowds
of people.

If the model becomes stuck against an object, do not continue to run
the motors. Remove the obstruction before continuing. Do not push
or pull objects with the model.

Because the model is controlled by radio, it is subject to radio
interference from many sources beyond your control. Since radio
interference can cause momentary losses of control, allow a safety
margin of space in all directions around the model in order to
prevent collisions.

Use good, common sense whenever you are driving your model.
Intentionally driving in an abusive and rough manner will only result
in poor performance and broken parts. Take care of your model so
that you can enjoy it for a long time to come.

High performance vehicles produce small vibrations which may
loosen hardware over time. Frequently check wheel nuts and other
screws on your vehicle to ensure that all hardware remains properly
tightened.

About Run Time

A large factor affecting run time is the type and condition of your
batteries. The milliamp hour (mAh) rating of the batteries determines
how large their “fuel tank” is. A 3000 mAh battery pack will theoretically
run twice as long as a 1500 mAh sport pack. Because of the wide variation
in the types of batteries that are available and the methods with which
they can be charged, it’s impossible to give exact run times for the model.

Another major factor which affects run time is how the model is driven.
Run times may decrease when the model is driven repetitively from a
stop to top-speed and with repetitive hard acceleration.

Tips for Increasing Run Time

Use batteries with the highest mAh rating you can purchase.

Use a high-quality peak-detecting charger.

Read and follow all maintenance and care instructions provided by
the manufacturer of your batteries and charger.

Keep the EVX-2 cool.

Lower your gear ratio. Installing smaller pinion gears will lower your
gear ratio and cause less power draw from the motors and batteries,
and reduce overall operating temperatures. Always replace both
pinion gears together.

Vary your speed. Continuous high-speed, high-gear running shortens
the run time on the E-Maxx.

Maintain your model. Do not allow dirt or damaged parts to cause
binding in the drivetrain. Keep the motors clean.

mAh Ratings and Power Output

The mAh rating of the battery can effect your top speed performance.
The higher capacity battery packs experience less voltage drop under
heavy load than low mAh rated packs. The higher voltage potential allows
increased speed until the battery begins to become discharged.

Get plenty of airow across the ESC heat sinks.

Running in Wet Conditions

Your new Traxxas E-Maxx is designed with water-resistant features to
protect the electronics in the model (receiver, servos, electronic speed
control). This gives you the freedom to have fun driving your E-Maxx
through puddles, wet grass, snow, and through other wet conditions.
Though highly water resistant, the E-Maxx should not be treated as
though it is submersible or totally, 100% waterproof. Water resistance
applies only to the installed electronic components. Running in wet
conditions requires additional care and maintenance for the mechanical
and electrical components to prevent corrosion of metal parts and
maintain their proper function.

Precautions

Without proper care, some parts of your model can be seriously

damaged due to contact with water. Know that additional
maintenance procedures will be required after running in wet

E-Maxx • 17

Driving Your Model

conditions in order to maintain the performance of your model.
Do not run your model in wet conditions if you are not willing to
accept the additional care and maintenance responsibilities.

Not all batteries can be used in wet environments. Consult your
battery manufacturer to see if their batteries can be used in wet
conditions. Do not use LiPo batteries in wet conditions (note: the
EVX-2 is not LiPo compatible).

The Traxxas TQ transmitter is not water resistant. Do not subject it to
wet conditions such as rain.

Do not operate your model during a rain storm or other inclement
weather where lightning may be present.

Do NOT allow your model to come in contact with salt water (ocean
water), brackish water (between fresh water and ocean water), or
other contaminated water. Salt water is highly conductive and highly
corrosive. Use caution if you plan to run your model on or near a beach.

Even casual water contact can reduce the life of your motors. Special
care must be taken to modify your gearing and/or your driving style
in wet conditions to extend the life of the motors (details below).

Before Running Your Vehicle in Wet Conditions

1.

Consult the section “After Running Your Vehicle in Wet Conditions”
before proceeding. Make sure you understand the additional
maintenance required with wet running.

2.

The wheels have small holes molded in to allow air to enter and exit
the tire during normal running. Water will enter these holes and get
trapped inside the tires if holes are not cut in the tires. Cut two small
holes (4mm or 3/16” diameter) in each tire. Each hole should be near
the tire centerline, 180 degrees apart.

3.

Conrm that the RX box O-ring and cover are installed correctly and
secure. Make sure the screws are tight and the blue O-ring is not
visible protruding from the edge of the cover.

4.

Conrm that your batteries can be used in wet conditions.

5.

Use lower gearing (smaller pinion gears, as low as 12T) when running
in mud, deep puddles, snow, or other similar situations that will
restrict the tires and put much higher loads on the motors.

Motor Precautions

Titan motor life can be greatly reduced in mud and water. If the
motors get excessively wet or submerged, use very light throttle (run
the motors slowly) until the excess water can run out. Applying full
throttle to a motor full of water can cause rapid motor failure. Your
driving habits will determine motor life with wet motors. Do not
submerge the motors under water.

Do not gear the motors by temperature when running in wet
conditions. The motors will be cooled by water contact and will not
give an accurate indication of appropriate gearing.

After Running Your Vehicle in Wet Conditions

1. Drain the tires by spinning the tires at full throttle to “sling” the water
out. An easy way to do this is to remove the body and set the truck
upside down on a at surface. Apply full throttle so the tires spin and
throw the excess water out of the holes you cut into the tires.

2. Remove the batteries.

3. Rinse excess dirt and mud off the truck with low-pressure water, such
as from a garden hose. Do NOT use pressure washer or other high­pressure water. Avoid directing water into the bearings, transmission,
differentials, etc.

4. Blow off the truck with compressed air (optional, but recommended).
Wear safety glasses when using compressed air.

5. Remove the wheels from the truck

6. Spray all the bearings, drivetrain, and fasteners with WD-40® or
similar water displacing light oil

7. Let the truck stand or you may blow off with compressed air. Placing
the truck in a warm sunny spot will aid drying. Trapped water and oil
will continue to drip from the truck for a few hours. Place it on a towel
or piece of cardboard to protect the surface underneath.

8. As a precautionary step, remove the sealed receiver box cover. While
unlikely, humidity or tiny amounts of moisture or condensation may
enter the receiver box during wet running. This can cause long-term
problems with the sensitive electronics in the receiver. Removing
the receiver box cover during storage allows the air inside to dry. This
step can improve the long-term reliability of the receiver. It is not
necessary to remove the receiver or unplug any of the wires.

18 • E-Maxx

Driving Your Model

9. Additional Maintenance: Increase your frequency of disassembly,
inspection and lubrication of the following items: This is necessary
after extended wet use or if the vehicle will not be used for an
extended period of time (such as a week or longer). This additional
maintenance is needed to prevent any trapped moisture from
corroding internal steel components.

• Stub axle housing bearings: Remove, clean, and re-oil the bearings.

• Front and rear differential: Remove,
disassemble, clean, and re-grease
the differentials. Refer to your
exploded view diagrams for help with
disassembly and reassembly.

• Transmission: Remove, disassemble,
clean, and re-grease the transmission
components. Use a light coating of
wheel bearing grease (from an auto
parts store) on the metal gear teeth.
No grease is required for the nylon gears. Refer to your exploded
view diagrams for help with disassembly and reassembly.

• Titan motors: Remove the motors, clean with aerosol motor
cleaner, and re-oil the bushings with lightweight motor oil. Be sure
to wear eye protection when using spray aerosol cleaners.

Receiver Box: Maintaining a Watertight Seal

Removing and Installing Radio Gear

The unique design of the receiver box allows the removal and
installation of the receiver without losing the ability to maintain a
watertight seal in the box. The patent-pending wire clamp feature
gives you the ability to also install aftermarket radio systems and
maintain the watertight features of the receiver box.

Removing the Receiver

1. To remove the cover, remove the two 3x10mm button-head
cap screws.

2. To remove the receiver from the box simply lift it out and set to the
side. The antenna wire is still inside the clamp area and cannot be
removed yet.

3. Remove the wire clamp by removing the two 2.8x8mm cap screws.

4. Unplug the servo cables from the receiver and remove the receiver.

Receiver Installation

1. Always install the wires into the RX box before installing the receiver.

2. Install the antenna wire and
the servo cables into the
receiver box.

3. Arrange the wires neatly using
the wire guides in the receiver
box. The excess wire will be
bundled inside the receiver
box. Label which wire is for
which channel.

4. Apply small bead of silicone grease
(Traxxas part #1647) to the wire clamp.

5. Install the wire clamp and tighten the two

2.8x8mm cap screws securely.

6. Install the receiver into the box and plug the
wires into receiver. Refer to page 9 for the wiring diagram.

7. Make sure the O-ring is
properly seated into the
groove in the receiver box so
that the cover will not pinch it
or damage it any way.

8. Install the cover and tighten
the two 3x10mm button-head
cap screws securely.

9. Inspect the cover to make sure that the O-ring seal is not visible.

E-Maxx • 19

Tuning Adjustments

Caster adjustment shims (1 Front, 1 Rear)

Caster adjustment shims (2 Front)

Caster adjustment shims (2 Rear)

Ver tical

4

Ground plane

7

Ver tical

Ground plane

Ver tical

Ground plane

10

For easier access to the
rear-most shock mounting
screw, remove the one end
of the rear turnbuckle. In the
front, remove the suspension
pin from the lower front
suspension arm to gain easier
access to the lower shock
mounting screws.

20 • E-Maxx

Suspension Tuning

Adjusting the Pivot Ball Caps

The pivot ball caps should be adjusted
so that the pivot balls operate freely in
the axle carriers with no excess play.
Use the provided four-way suspension
multi-tool to tighten or loosen the
pivot ball cap.

Caster Adjustment

The E-Maxx offers the ability to adjust the caster angle of the front
suspension. Caster adjustment may be used to influence the understeer/
oversteer handling characteristics of the E-Maxx. Increasing the caster
angle will increase the tendency of the truck to oversteer (less traction
on the rear tires, more traction on the front tires), while decreasing the
caster angle will cause the truck to have a tendency to understeer (push
in the turns). This effect becomes more pronounced at higher steering
angles and higher spring rates. Caster is adjusted by repositioning the
shims on the pivot point of the upper suspension arms.

The stock caster setting is 7-degrees with one shim at each end of the
arm. Reduce the caster angle to 4-degrees by removing the rear shim
and inserting it next to the front shim. The caster angle can be increased
to 10-degrees by removing the front shim and inserting it next to the
rear shim.

Fine Tuning the Shocks

The eight shocks (oil dampers) on your E-Maxx have tremendous
influence on its handling. Whenever you rebuild your shocks, or make
any changes to the pistons, springs or oil, always do it carefully and in
sets (front or rear). Piston head selection depends on the range of oil
viscosities that you have available. For example, using a two-hole piston
with lightweight oil will give you the same damping as a three-hole
piston with heavier oil.

We recommend using two-hole pistons with
a range of oil viscosities from 30W to 50W
(available from your hobby shop). The thinner
viscosity oils (30W or less) flow with less
resistance and provide less damping, while
thicker oils provide more damping. Use only
100% pure silicone shock oil to prolong seal life.
From the factory, the E-Maxx uses 30W oil.

The ride height for the E-Maxx can be adjusted
by adding or removing the clip-on spring pre-
load spacers. Note that changes in ride height
will occur when changes in shock angle or spring
rates are made. You can compensate for ride
height changes by changing the pre-load spacers
on the shocks

Shock Mounting Positions

Big bumps and rough terrain require a softer suspension with the
maximum possible suspension travel and ride height. Racing on a
prepared track or on-road use requires a lower ride height and firmer,
more progressive suspension settings. The more progressive suspension
settings help reduce body roll (increased roll stiffness), dive during
braking, and squat during acceleration.

Upper shock mounting position
(A) should generally be used
with lower shock mounting
positions 1 and 2. Upper shock
mounting position (B) should
be generally be used with lower
shock mounting positions 3 and

4. The innermost upper shock
mounting position (0) can be
used for tuning with the inner
pair of lower shock mounting
positions on the arm (1,2). It
is not compatible with lower
shock mounting positions 3 and

4. Other combinations may be
used to achieve individualized
suspension settings.

2.5

2

1.5

1

0.5

0

0102030406070809010

0

50

Wheel Force (lb)

Wheel Travel (mm)

Wheel Force vs. Wheel Travel

Lower Mount 1, Upper Mount 0
Lower Mount 2, Upper Mount 0
Lower Mount 1, Upper Mount A
Lower Mount 2, Upper Mount A
Lower Mount 3, Upper Mount A
Lower Mount 4, Upper Mount A
Lower Mount 1, Upper Mount B
Lower Mount 2, Upper Mount B
Lower Mount 3, Upper Mount B
Lower Mount 4, Upper Mount B

Less Firm

More Firm

Lower Mount 4

Lower Mount 3

Lower Mount 2

Lower Mount 1

Tuning Adjustments

Lower Shock Mounting Positions

In the out-of-the-box configuration, the shocks are installed in
position (A) on the shock tower and position (2) on the lower
suspension arm. This setting allows for firm suspension and low
ride height, increasing the spring force (at the wheel). This setting
improves high-speed cornering on smoother terrain by lowering the
center of gravity. Body roll, brake dive, and squat are also reduced.

The inner pair of holes on the lower suspension arm should
be used to increase the ride height of the E-Maxx. The more vertical
position of the shocks will allow for lower shock progression and the
soft, plush feel that’s characteristic of a Traxxas Maxx Truck.

Spring rate (at the wheel) increases as the lower shock mounting
position is moved from position (1) to position (4). This is equivalent
to using stiffer springs. Use higher spring rate settings for flatter
terrain with smaller and fewer bumps, and lower spring rate settings
for bigger bumps.

Ride height decreases as the lower shock mounting position is

moved from position (1) to position (4). Each pair of lower shock
mounting holes (1,2 and 3,4) has equal ride height. Use lower ride
height for high-speed cornering and flat terrain, and when racing on
relatively smooth tracks. Increase the ride height for rougher terrain
and tracks.

Upper Shock Mounting Positions

The upper shock mounting positions will have suspension effects
opposite from the lower shock mounting positions.

Spring rate (at the wheel), increases as the upper shock mounting
position is moved from position (A) to position (B).

Ride height is not affected by changes in the upper shock mounting
position.

Use the chart below to see the effect of the various shock mounting
positions. The horizontal length of the lines indicates the amount of
suspension travel. The angle or slope of the lines indicates the spring
rate (at the wheel).

E-Maxx • 21

Tuning Adjustments

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To achieve a good starting
point for the slipper clutch,
tighten the slipper clutch
adjusting nut clockwise until
the slipper clutch adjusting
spring fully collapses (do not
over tighten), and then turn
the slipper clutch nut counter­clockwise ¼ to ½ turn.

All of the toe links are installed
on the truck so that the left
hand thread indicators point
to the same direction. This
makes it easier to remember
which way to turn the wrench
to increase or decrease toe link
length (the direction is same
at all four corners). Note that
the groove in the hex indicates
the side of the toe link with the
left-hand threads.

22 • E-Maxx

Alignment Settings

Adjusting the Toe-in

Your E-Maxx comes from the factory with
zero degrees of toe-in in the front, and
one degree of toe-in in the rear. You can
adjust the toe-in on the front and rear of
the truck. Set the steering trim on your
transmitter to neutral. Next, adjust your
steering turnbuckles so that both front
wheels are pointing straight ahead and
are parallel to each other (0 degrees toe-
in). This will ensure the same amount of
steering in both directions. Adjust the
rear toe control links so that the rear
wheels have 1˚ of toe-in.

Static Camber Adjustment

The wheels can be set to have either
positive or negative camber (see illustration
below). The camber angle changes as the
wheel moves up and down through its range
of travel. Static camber is the camber angle at
the wheel when the vehicle is set at its normal,
stationary ride height.

The suspension pivot balls located in the axle
carriers adjust the static camber. The pivot
balls are protected by blue dust plugs. To
adjust your static camber, insert the supplied

2.5mm hex wrench through the slit in the dust plug and engage the
end of the pivot ball (compressing the suspension until the arms are
parallel to the ground will allow for easier hex wrench engagement).
The upper pivot ball is normally screwed all the way in. Negative
camber is achieved by screwing the pivot ball of the lower control
arm out. Note: When camber is changed, the toe angle of the wheel
has to be reset.

Positive Camber Negative Camber

Right Hand
(Normal) Threads

Left Hand
Threads

Decrease

Length

Increase

Length

Static Camber Base
Factory Settings

Front: 1-degree negative

camber each side
Rear: 1-degree negative
camber each side

Transmission Tuning

Adjusting the Slipper Clutch

The E-Maxx is
equipped with an
adjustable Torque

Tighten

Control slipper
clutch which is built
into the large spur
gear. The purpose
of the slipper clutch

Loosen

is to regulate the amount of power sent
to the rear wheels to prevent tire spin. When
it slips, the slipper clutch makes a high-pitch,
whining noise.

To adjust the slipper clutch, remove the rubber
slipper clutch plug on the transmission cover. The slipper clutch is
integrated into the main spur gear on the transmission. The slipper
clutch is adjusted using the spring-loaded locknut on the slipper
shaft. Use the supplied universal wrench. To tighten or loosen the
slipper nut, insert the 2.0mm hex wrench into the hole in the end
of the slipper shaft. This locks the shaft for adjustments. Turn the
adjustment nut clockwise to tighten (less slippage) and counter­clockwise to loosen (more slippage).

Wheels and Tires

Many types of aftermarket tires and wheels can be adapted for
use on your model. Most will affect the overall width and the
suspension geometry of the model. The offsets and dimensions
designed into the model’s wheels are intentional; therefore,
Traxxas cannot recommend the use of other non-Traxxas wheels
with different specications. The diameter of the wheels is an
innovative design, and there is a variety of different tires available
for you to experiment with in addition to the included tires on the
model (listed in your parts list). Experimentation with different
types of tires is recommended to see which ones work the best on
the terrain where the model is run. When selecting tires, consider
the overall diameter and the rubber compound (hard or soft). If
the overall diameter of the tire is signicantly increased, you will
need to use a smaller pinion gear to compensate for the larger tire.
Soft compound tires with many short spikes generally work better
on hard, dry surfaces. In loose dirt, a tire with large spikes should
perform better. See your parts list for accessory wheels and tires.

Tuning Adjustments

Motors and Gearing

The Titan™ 550 Motors on your E-Maxx have been carefully designed
to match the needs of the E-Maxx. The Titans are made to run
efciently at high voltage to provide more torque and longer run
times. We do not recommend converting the E-Maxx to a typical
low voltage setup using traditional 540 size motors. While these
components will physically t into the E-Maxx, the system will not run
as efciently, losing power in the form of motor and battery heating.
The result will be shorter run times, high current draw, and extreme
battery and motor temperatures. If you are considering replacement
motors, look for 550 motors capable of 12 or more volts.

The E-Maxx is equipped from the factory with a 68-tooth spur gear
and 19-tooth pinion gears. E-Maxx has a large range of gearing
making it suitable for many different types of applications and
environments. If you want more acceleration and less top speed, use
a smaller pinion gear (fewer teeth, higher numerical ratio). The overall
reduction is the number of turns the motor makes for one revolution
of the tire. Higher numerical ratios provide more torque, lower
numerical ratios provide more top speed. With the Titan motors,

do not use a pinion gear larger than 20-tooth with the stock 68-
tooth spur gear with 6-cell battery packs or a pinion gear larger
than 19-tooth with the stock 68-tooth spur gear when using 7-cell
battery packs. Use the following formula to calculate the overall ratio

for combinations not listed on the gear chart:

# Spur Gear Teeth

# Pinion Gear Teeth

Going Brushless

Brushless motors provide increased power output and greater
efciency. The E-Maxx is designed with extra transmission and
driveline strength to make it capable of handling extreme brushless
power. One or two brushless motors may be used. A specially
designed motor plate (part # 3997X) and gear cover (part # 3977X)
are available for optimized, single-motor installations. If you plan
to run LiPo battery packs to power a LiPo-compatible brushless
system, optional battery hold downs (part # 3927X) are available to
accommodate larger, high capacity 2S and 3S LiPo battery packs.

For the ultimate in extreme brushless speed and acceleration, install
twin Velineon power systems (part number 3350). Two Velineon
brushless motors powered by two Velineon VXL-3s speed controls in
tandem results in amazing power output. Visit www.Traxxas.com for
more details about power upgrades.

x 5.22 = Final Gear Ratio

Adjusting Gear Mesh

Incorrect gear mesh is the most
common cause of stripped spur
gears. Gear mesh should be
checked and adjusted anytime
a gear is replaced. Access the
gears by removing the single
screw on the top gear cover.

To set the gear mesh, cut a
narrow strip of notebook paper
and run it into the gear mesh.

Motor

Screws

Strip of

Paper

Loosen the motor screws and
slide a motor and pinion gear
into the spur gear. Retighten
the motor screws and then
remove the strip of paper.
Repeat with the other motor.
You should be able to run a
fresh strip of paper through the
gears without binding them.

Dual Steering System

Your new E-Maxx uses dual-servo steering and a single heavy-duty
servo saver for powerful, responsive steering. To prevent damage
to the steering servos, it is important to make sure that the servos
are “at rest” when the steering is at neutral. If one servo is out of
adjustment, then both servos will work against each other, ghting
to nd center.

Center

Drag Link

Servo Horn

Toe Link

Bellcrank

Toe Link

Servo Horn

Servo Saver

Gearing Compatibility Chart:

The chart below shows a full range
of gear combinations. This does NOT
imply that these gear combinations
should be used. Over-gearing
(bigger pinions, smaller spurs) can
overheat and damage the motor
and/or speed control.

Spur Gear

62 65 68

12

- - 29.57

13

- - 27.29

14

- 24.23 25.34

15

- 22.61 23.65

16

- 21.20 22.18

17

19.03 19.95 20.87

Pinion Gear

18

17.97 18.84 19.71

19

- 17.85 18.67

20

- - 17.74

21

- - -

22

- - -

Stock factory gearing

Not for 14-cell
battery running

Not recommended

E-Maxx • 23

Tuning Adjustments

Adjusting the Steering System

1. Disconnect the short steering link that connects the servo saver
to the servo horn.

2. Remove the drag link that connects the two servo horns.

3. Remove the servo horns

4. Connect a pair of charged batteries to the ESC. Turn on the
transmitter, then the ESC. Note: It is recommended to unplug
the motors or remove the pinion gears during steering setup.

5. Adjust the steering trim on the transmitter to the
neutral “0” position.

6. Install both servo horns. Make sure they are parallel to the
center line of the chassis (pointing to the rear of the truck).

7. Connect the short steering link from the servo saver to the
servo horn. Make sure the servo saver is parallel to the center
line of the chassis (also parallel to the servo horns). If not,
make small adjustments to the length of the link so the
everything is parallel.

10. Connect the center drag link to one of the steering servos.
Check for alignment with the holes in the second steering link.
If these do not line up, make small adjustments to the length of
the link until the holes line up.

11. Connect the center drag link to the second steering
servo horn.

12. If necessary, ne tune the length of the center link to eliminate
any load on the steering system in the neutral position.

If you are using aftermarket servos, it is important to use servo
horns designed for E-Maxx. Optional steering servo horns are sold
separately for use with non-Traxxas servos.

24 • E-Maxx

8. The steering should operation correctly with equal travel left
and right. Now connect the second servo.

9. Conrm the length of the center drag link (89.5mm - see
template, below).

Center Drag Link

89.5mm

Maintaining your Model

Your model requires timely maintenance in order to stay in top
running condition. The following procedures should be taken

very seriously.

Inspect the vehicle for obvious damage or wear. Look for:

1. Cracked, bent, or damaged parts

2. Check the wheels and steering for binding.

3. Check the operation of the shock absorbers.

4. Check the wiring for any frayed wires or loose connections.

5. Check the mounting of the receiver and servo(s) and
speed control.

6. Check the tightness of the wheel nuts with a wrench.

7. Check the operation of the radio system, especially the
condition of the batteries.

8. Check for any loose screws in the chassis structure
or suspension.

9. Inspect the gears for wear, broken teeth, or debris lodged
between the teeth.

10. Check the tightness of the slipper clutch.

11. Check the tightness of the front pivot balls.

Other periodic maintenance:

Slipper clutch pads (friction material):

Under normal use, the friction material in the slipper clutch
should wear very slowly. If the thickness of any one of the slipper
clutch pads is 1.8mm
or less, the friction disc
should be replaced.
Measure the pad
thickness using calipers
or measuring against
the diameter of the 1.5 and

2.0mm hex wrenches provided
with the model.

Motors: Every 10-15 runs, remove, clean, and lubricate the

motors. Use a product such as electric motor cleaning spray to
ush dirt out of the motors. After cleaning, lubricate the bushings
at each end of the motors with a drop of light-weight electric
motor oil.

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 in the top cap for signs of damage or distortion from
overtightening. If the bottom of the shock is leaking, then it
is time for a rebuild. The Traxxas rebuild kit for two shocks is
part #2362.

Suspension: Periodically inspect the model for signs of damage

such as bent or dirty suspension pins, bent turnbuckles, loose
screws, and any signs of stress or bending. Replace components
as needed.

Driveline: Inspect the driveline for signs of wear such as worn

drive yokes, dirty axle half shafts, and any unusual noise or
binding. Remove the gear cover and Inspect the spur gear for
wear and check the tightness of set screws in the pinion gears.
Tighten, clean, or replace components as needed.

Storage

When you are through running the model for the day, blow it off
with compressed air or use a soft bristled paint brush to dust-off
the vehicle. Always disconnect and remove the batteries from the
model whenever the model is stored. If the model will be stored for
a long time, then also remove the batteries from the transmitter.

Always wear eye protection
when using compressed
air or spray cleaners and
lubricants.

Chassis: Keep the chassis clean of accumulated

dirt and grime. Periodically inspect the chassis for
damage.

E-Maxx • 25

Troubleshooting

26 • E-Maxx

The following section addresses some very basic ESC and radio questions
you may have about your model. Most questions arise from simple user
errors or minor adjustments that are easy to correct. If you can’t nd a
solution for your model here, then visit our website at www.Traxxas.
com/support. There you will nd a much more extensive and detailed online
troubleshooting area. In addition, you may call Traxxas Customer Service at
1-888-TRAXXAS (outside the US call 972-265-8000).

Radio system does not work properly:

If the power light on the transmitter does not come on, check for proper
battery installation and that the batteries are new and/or fully charged.
If the power light is blinking, then the transmitter batteries are weak and
should be replaced. See page 11 for more details.
If the transmitter light is on but the radio is still not responding, check for
proper installation of batteries in the model and that the batteries are
new and/or fully charged. Check to make sure the on/off switch on the
model is in the on position. Check for damaged wires, a loose crystal, or
loose connections. See page 11 for more details.

Short radio range:

If the radio range appears short, then rst check to make sure the
transmitter antenna is fully extended and that the antenna in the model
is in place and has not been cut or damaged. Next, make sure the
batteries are all fully charged. Finally, if you are still experiencing short
range, try a different location. Sometimes there can be interference from
various sources that can cause your radio to malfunction.

Steering channel works, but the motor(s) will not run:

The motor(s) could be bad or have a damaged brush. Check the motor(s)
and motor connections by supplying power directly to the motor(s).
Note: Disconnect the motor(s) from the ESC before testing. Remove the
pinion gear from the motor(s) or elevate the driving wheels to avoid a
runaway and damage to the vehicle.
The speed control has thermally shut down (look for a solid green LED).
Allow the speed control to cool down. See the overheating section.
Make sure the EVX-2’s power cable is plugged into the throttle channel
of the receiver (Channel 2). Check the operation of the radio system’s
throttle channel with a servo.

Possible internal damage. Contact Traxxas for service.

EVX-2 will not go into programming mode:

Make sure the EVX-2 is plugged into Channel 2 (the throttle channel) on
the receiver. If it is plugged into Channel 3 or the battery terminal, it will
not go into programming mode.
Be sure the EVX-2 is turned off before trying to program or select a prole.

Unplug batteries, reconnect, and repeat programming instructions.

Steering servos do not work:

Check the wires, radio system, crystals, battery and motor connectors,
and the battery packs.

Possible internal damage. Contact Traxxas for service.

Motor(s) run backwards:

Motor(s) wired backwards: check the wiring and correct.
Backwards motor timing: reverse the motor end bells.

Receiver glitches/throttle stutters during acceleration:

Motor capacitors broken or missing: check and replace the capacitors.
The receiver or antenna is too close to power wires or batteries.
Bad connections: check the wiring and connectors.
Motor worn: replace the motor.
Excessive current to the motor: use a milder motor or a smaller pinion gear.

Model runs slowly / slow acceleration:

Check the motor and battery connectors.
Check to see if EVX-2 is in Prole #3 (50% throttle)
Bad battery or motor: check the operation with known good batteries
(freshly charged) and motor.
Incorrect transmitter or speed control adjustment. Reprogram the EVX-2.
Motor is improperly geared: use a milder motor or a smaller pinion gear.
Check the drive train for binding or restrictions.

Gear mesh too tight or binding, refer to “Adjusting Gear Mesh” on page 23.

EVX-2 overheats and shuts down:

Overloading the motor (running through tall grass, binding in the
drivetrain).
Insufcient ventilation for the heat sinks. Cut ventilation holes in the body
or relocate the EVX-2.
Motor may exceed maximum specication. The EVX-2 is limited to motors
with no fewer 12-turns (550 size) with Traxxas High-Current Connectors.
Motor is improperly geared. Use a milder motor or a smaller pinion gear.
Check the drivetrain for restrictions.

Model will not go in reverse:

Make sure the throttle trim is in the correct position (green light on EVX-2

should be solid)

Check for correct EVX-2 prole (Prole #2 does not have reverse).

Motor runs as soon as the batteries are plugged in:

Before turning on EVX-2:

for service.

Keep stripping spur gears:

Improper gear mesh, refer to “Adjusting Gear Mesh” on page 23.
Loose motor. Readjust mesh and tighten the motor screws.

Internal damage, Contact Traxxas

Index

Alignment Settings, 22
Antenna

mount, 6
receiver, 9, 11
antenna crimp nut, 11
antenna nut wrench, 5, 11
transmitter, 13

Axle carrier, 6, 20, 22
Batteries

AA alkaline batteries, 5, 10
AA rechargeable batteries, 5, 10
charging, 4, 12
compartment, 6
installing, 12
LiPo, 5, 12, 23
NiCad, 10
NiMH, 10
safety, 4
side-by-side packs, 12
stick packs, 12

Battery Hold-Down, 6, 12
BEC (Battery Eliminator Circuit), 10
Bellcrank, 23
Body Mount, 6
Brushless, 23
Bulkhead, 6
Bumper, 6
Camber, 22
Caster, 20
Charger, 12
Charging; see Batteries: charging
Chassis, 6

maintenance, 25

Crystal (X-tal), 9, 10
Decals, 8
Differential (Diff), 6
Driveline, 25
Driving, 17, 18, 19

wet conditions, 17, 18, 19

Electronic Speed Control (EVX-2), 6, 9, 10, 15, 16

fast mode changes, 16
heat sinks, 4, 9
LED, 9, 14, 15, 16, 26

operation, 15
prole selection, 16
Race mode, 16
setup programming, 15
specications, 15
Sport mode, 16
Training mode, 16
transmitter adjustments, 15

ESC; see Electronic Speed Control (EVX-2)
Gears (Gearing), 23

gear mesh, 23
gear ratio, 23

Half Shaft, 6
Hex hub, 6
High-Current Connector, 9, 12, 13
mAh, 10, 17
Maintenance, 25
Molex Connector, 12, 13
Motor (Titan), 6, 9, 23

maintenance, 25

Pinion Gear, 23
Pivot ball, 6, 25

adjusting caps, 20
camber adjustment, 22

Quick Start, 7
Radio System (TQ), 9–14

adjustment, 13
channel, 9, 10
controls, 13
frequency
band, 10
clearing your, 10, 14
range-testing, 14
rules, 14
setup, 14
terminology, 10
transmitter, 9, 10
batteries, 10, 11
light ashes, 11
servo reversing switch, 13
throttle neutral adjustment, 13
trim, 9, 10, 13
wiring, 9

Receiver, 9, 10, 19

box, 19

Ride Height, 21
Run Time, 17
Safety, 4
Servos, 6, 10

servo horn, 23
servo saver, 23

Set Button, 9
Shocks (Oil Damper)

ne tuning, 20
mounting positions, 20–21
ride height, 21
shock tower, 6
spring rate, 21

Skid plate, 6
Slipper Clutch, 6, 22, 25
Speed control; see Electronic Speed Control (EVX-2)
Spring Rate, 21
Spur Gear, 23
Steering System, 23

adjusting, 24
drag link, 23, 24

Storage, 25
Suspension Arm, 6
Suspension Maintenance, 25
Suspension Tuning, 20
Thermal Shutdown Protection, 10
Tires, 22

tire gluing, 8

Toe-in, 22
Toe link, 6, 20, 22, 23, 25
Tools, 5
Training Mode, 16
Transmission, 6

tuning, 22

Transmitter; see Radio System (TQ): transmitter
Troubleshooting, 26
Tuning Adjustments, 20–24
Turnbuckle; see Toe link
Turning on the model, 14
Wheels, 22

E-Maxx • 27

071121 KC0547

owners manual

MODEL 3905

1100 Klein Road, Plano Texas 75074

1-888-TRAXXAS