Xray M18 PRO Supplementary Instructions

VERY IMPORTANT! READ THIS!

SUPPLEMENTARY INSTRUCTIONS SHEET

MICRO BALL DIFFERENTIAL SETTING AND BREAK-IN

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 car 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 car 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 car 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 car 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.

REMOVING SCREW

Remove the screw from the top and bottom of the front steering block or rear upright. After removing the screw, lift the upper and bottom arm to allow the drive shaft to

TIGHTENING FRONT DIFF TIGHTENING REAR DIFF

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To tighten the front differential you need to remove the RIGHT front upper and bottom
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.

REMOVING UPPER ARM

disconnect from the differential. You can now fi t the screwdriver into the ball diff.

HOLD TIRE

To tighten the rear differential you need to remove the LEFT rear upper and bottom
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.

CHECKING FRONT DIFF SLIP CHECKING REAR DIFF SLIP

GRAB SPUR GEAR

TURN WHEEL TO

CHECK SLIP

TURN WHEEL TO

CHECK SLIP

HOLD TIRE

To check the slip of the front differential, grab the RIGHT front wheel and grab the
spur gear or pinion. Turn the left front wheel. You should be able to turn the wheel
but with resistance.

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)

If you have any questions, please do not hesitate to contact XRAY at [e-mail] or visit our website at

To check the slip of the rear differential, grab the RIGHT rear wheel and grab the spur
gear or pinion. Turn the left rear wheel. You should be able to turn the wheel but with
resistance.

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