Basic Tuning Adjustments - Traxxas XRT 78086-4 Owner's Manual

Table of Contents

Advertisement

PIN LOCATION CHART
Spur Gear
46
50
54
11
-
-
A, F
12
-
-
B, F
13
-
-
B, G
14
-
A, E
C, G
15
-
A, F
C, H
16
-
B, F
D, H
17
-
B, G
D, I
18
A, E
C, G
I
19
A, F
C, H
-
20
B, F
D, H
-
21
B, G
D, I
-
22
C, G
I
-
23
C, H
-
-
24
D, H
-
-
25
D, I
-
-
26
I
-
-
24 • XRT

BASIC TUNING ADJUSTMENTS

Once you become familiar with driving your model, you might need
to make adjustments for better driving performance.
Adjusting Gear Mesh
Incorrect gear mesh is the most common cause of stripped spur
gears. XRT makes improper gear mesh virtually impossible. A pin
system helps set the motor in the proper place according to the
pinion and spur gear that are selected.
To access the pin system, remove the four motor mount screws
from the bottom of the chassis and lift off the motor. Next, remove
the two 3x10mm screws that secure the gear cover and remove the
gear cover. This will expose the pins. Be sure not to lose the pins that
go between the motor and the chassis.
Select the desired gearing from the pin location chart. Replace
the spur and pinion gears as needed. When installing the motor,
install the pins into their proper locations based on the gearing
that is chosen. The four pins on the bottom help to lock the motor
into the proper place for correct
gear mesh (only two pins are used
in the "I" slots with pinion/spur
gear combinations 26/46, 22/50, or
18/54). Secure the motor in place
with four 4x16mm button-head cap
screws inserted from the bottom of
the chassis.
Note: Should you choose to do so, you can also set the gear mesh
manually without the pins. With the pins removed, use the four
4x16mm button-head cap screws on the bottom to set gear mesh.
Loosen the four 4x16mm button-head cap screws. Cut a narrow
strip of notebook paper and run it into the gear mesh. Slide the
motor and pinion gear into the spur gear. Tighten the four 4x16mm
button-head cap screws, and then remove the strip of paper. You
should be able to run a fresh strip of paper through the gears
without binding them.
Centering Your Servo
If you have removed the servo horn from your XRT's steering
servo, or the servo has been removed for service or cleaning, the
servo must be re-centered prior to installation of the servo horn or
installation of the servo.
1. Remove the servo horn from the steering servo.
2. Connect the steering servo to channel 1 on the receiver. Connect
the electronic speed control (ESC) to channel 2. The white wire on
the servo lead is positioned toward the receiver's LED.
3. Turn the transmitter power switch on. Make certain the
transmitter's batteries are not depleted.
4. Turn off TSM (see page 17).
5. Turn the transmitter's steering trim knob to the center "0" position.
6. Disconnect both the blue and white motor connectors (see page
12) to prevent the motor from turning during the next steps.
Connect a fresh battery pack to the speed control and turn on the
3x10mm
ESC (see page 18). The servo's output shaft will automatically jump
CS
to its center position.
7. Install the servo horn onto the servo output shaft. With the servo
laying down flat, the servo horn should be installed vertically so
that it is in the centered position.
8. Check servo operation by turning the steering wheel back and
forth to ensure that the mechanism
has been centered properly and you
have equal throw in both directions.
Use the transmitter's steering trim
knob to fine-tune the position of
the servo horn so the model tracks
straight when the steering wheel is at
neutral.
4x16mm
BCS

Advertisement

Table of Contents
loading

Table of Contents