Traxxas 39036-1 User Manual

Page 24

24 • E-MAXX

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.

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
efficiently 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 fit into the E-Maxx, the system will not run
as efficiently, 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 17-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:

Going Brushless
Brushless motors provide increased power output and greater
efficiency. 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.

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.
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, fighting
to find center.

# Spur Gear Teeth

x 5.22 = Final Gear Ratio

# Pinion Gear Teeth

Motor

Screws

Strip of

Paper

Stock factory gearing

Not for 14-cell

battery running

Not recommended

Spur Gear

Pinion Gear

29.57

27.29

24.23

25.34

22.61

23.65

21.20

22.18

19.03

19.95

20.87

17.97

18.84

19.71

17.85

18.67

17.74

Servo Saver

Center

Drag Link

Servo Horn

Toe Link

Bellcrank

TUNING ADJUSTMENTS