Traxxas 71074-1 - Manual (Page 24)

24 • 1/16 E-REVO VXL
Spur Gear
Pinion Gear
45 50 55
11 - - 25.20
12 - - 23.10
13 - - 21.32
14 - - 19.80
15 - - 18.48
16 - 15.75 17.33
17 - 14.82 16.31
18 - 14.00 15.40
19 - 13.26 14.59
20 - 12.60 13.86
21 10.80 12.00 13.20
22 10.31 11.45 12.60
23 9.86 10.96 12.05
24 9.45 10.50 11.55
25 9.07 10.08 11.09
26 8.72 9.69 10.66
27 8.40 9.33 10.27
28 8.10 9.00 9.90
29 7.82 8.69 9.56
30 7.56 8.40 9.24
31 7.32 8.13 8.94
MOTOR AND GEARING
Extensive testing has been done to determine the best gear ratio
for your model. The stock gearing balances power, speed, and
efficiency to optimize the performance of the model. However,
you may wish to try different gear ratios in order to customize the
performance of your model. The gearing chart on this page shows
appropriate gearing for the model.
By installing a pinion with fewer teeth, or a spur gear with
more teeth, the transmission’s final drive ratio is increased.
This means greater rpm is required to achieve a given speed.
Using a numerically higher gear ratio will increase torque, but
reduce top speed. Installing a pinion with more teeth, or a spur
gear with fewer teeth, will decrease the final drive ratio, which
will generally increase top speed but reduce torque. However,
installing too large a pinion will “overgear” the model, which will
reduce performance and may overheat the motor and speed
control. Use the following formula to calculate the overall ratio for
combinations not listed on the gear chart:
Motor Installation
To access the motor,
remove the gear
cover by removing
the single screw on
the top of the gear
cover. The motor
uses an aluminum
mount for quick,
easy motor access and gearing adjustment.
To remove the motor, first open the right
battery door and slide out the ESC. Next,
remove the single large hex screw using the
supplied 2.5mm wrench. Then rotate the
motor and mount to the side of the model,
and slide backward off the post.
The motor mount is carefully engineered
to provide additional features and
adjustability. Two sets of holes are
provided for use with brushed and brushless motors. The holes for
brushed motors are spaced 16mm apart and accept 2.5mm screws.
The holes for brushless motors are spaced 19mm apart and accept
3mm screws.
Pinion Gear Installation Instructions
1. Remove the motor as described
previously in Motor Installation.
2. Use a 1.5mm wrench to loosen the
pinion’s set screw. Remove the pinion.
3. Place the replacement pinion gear onto
the motor shaft. Align the set screw
hole with the flat side of the shaft.
4. Thread a 1.5mm set screw into the
pinion gear but do not tighten it yet.
5. Slide the pinion gear down the motor shaft so the wrench shaft
fits into the notch in the motor mount, as shown. Tighten the
set screw.
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 of the motor. The motor is mounted
to an aluminum motor mount. Loosen the
single motor mount screw with the provided
2.5mm wrench to slide the motor mount.
Slide the motor and pinion gear into the
spur gear. Retighten the motor mount screw
and then remove the strip of paper. You
should be able to run a fresh strip of paper
through the gears without binding them.
TUNING ADJUSTMENTS
Motor Mount
Screw
Do Not Loosen
# Spur Gear Teeth
x 5.04 = Final Gear Ratio
# Pinion Gear Teeth
Brushed Motors
Brushless Motors
Motor Mount Positions
Gearing Compatibility Chart
This chart shows a full range of gear
combinations. The gear combinations in gray
are not suitable when using the included
6-cell battery, speed control, and motor.
These gear combinations have been included
in this chart as they may be used with certain
other aftermarket equipment combinations.
Stock
Acceptable range for included single battery
Acceptable range for included single battery/
Recommended range for dual batteries using
series connector (Part #3063, sold separately)
High Speed Gearing for dual batteries using
series connector (Part #3063, sold separately)
Not suitable for stock model