Xray Nitro Micro NT18MT Instruction Manual - page 19
19
To check the slip of the front differential, grab the RIGHT front wheel and apply
the brake. Turn the left front wheel. You should be able to turn the wheel but with
resistance.
To check the slip of the rear differential, grab the RIGHT rear wheel and apply the brake.
Turn the left rear wheel. You should be able to turn the wheel but with resistance.
To tighten the front differential you need to remove the RIGHT front upper arm to give
access into the diff for adjustment with the included Phillips screwdriver. Insert the
screwdriver tip into the differential adjustment screw, hold the left front wheel fi rmly and
then tighten (CW) the screw as required.
Please note that the factory pre-assembled ball differential is pre-built but is NOT tightened. To enjoy long life and smooth performance of the differential, you need to break in
both front and rear differentials properly. You will need to run the truck several times for a short time, and each time tighten both differentials a small amount.
DIFFERENTIAL SETTING
To tighten the differentials, remove the front/rear upper arms as described below, and use a Phillips screwdriver to tighten the diff adjustment screw.
BREAK-IN PROCEDURE
1. Run the truck for the fi rst time at only ¼ throttle for 30-60 seconds.
2. Tighten both front and rear diffs slightly by 1/16 turn.
3. Run the truck again for 2 minutes at ¼ throttle.
4. Tighten both front and rear diffs slightly by 1/16 turn. The differential should still turn freely.
5. Run the truck again for 5 minutes, this time up to ½ throttle.
6. Again tighten both front and rear diffs by 1/16 turn.
Now the differential should be tight enough. The differentials should still turn freely but it must slip with higher resistance.
To tighten the rear differential you need to remove the LEFT rear upper arm to give
access into the diff for adjustment with the included Phillips screwdriver. Insert the
screwdriver tip into the differential adjustment screw, hold the right rear wheel fi rmly
and then tighten (CW) the screw as required.
BREAK-IN PROCEDURE QUICK TABLE
Run
Run-time
Throttle applied
After run tighten diff by
1st
30~60sec.
¼ throttle
1/16 turn (CW)
2nd
2 min
¼ throttle
1/16 turn (CW)
3rd
3 min
½ throttle
1/16 turn (CW)
HOLD TIRE
HOLD TIRE
HOLD TIRE
APPLY BRAKE
TURN WHEEL TO
CHECK SLIP
TURN WHEEL TO
CHECK SLIP
APPLY BRAKE
HOLD TIRE
Remove the screw from the top of the front steering block or rear upright.
After removing the screw, lift the upper arm to allow the drive shaft to disconnect from
the differential. You can now fi t the screwdriver into the ball diff.
TIGHTENING FRONT DIFF
TIGHTENING REAR DIFF
CHECKING FRONT DIFF SLIP
CHECKING REAR DIFF SLIP
REMOVING SCREW
REMOVING UPPER ARM
BREAKING IN THE BALL DIFFERENTIALS