Yamaha YXR70FX Service Manual page 487

8. Differential gear motor
• Disconnect the differential gear motor cou-
pler.
• Remove the differential gear motor from
the differential gear case.
Refer to "FRONT CONSTANT VELOCITY
JOINTS, DIFFERENTIAL GEAR AND
DRIVE SHAFT" in chapter 7.
• Connect two C size batteries to the differ-
ential gear motor terminals 1 (as shown
illustrations).
È Check that the pinion gear 2 turns counter-
clockwise.
É Check that the pinion gear 2 turns clockwise.
È
2
É
2
• Make sure that the drive gear (shift fork
sliding gear) operates correctly.
TIP:
When installing the differential gear motor,
refer to "FRONT CONSTANT VELOCITY
JOINTS, DIFFERENTIAL GEAR AND DRIVE
SHAFT" in chapter 7.
YES
2WD/4WD SELECTING SYSTEM
3V
1
3V
1
NO
Replace the differen-
tial gear motor.
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EBS01094
9. Wiring connection
• Check the connections of the entire 2WD/
4WD selecting system.
Refer to "CIRCUIT DIAGRAM".
• Is the 2WD/4WD system wiring properly
connected and without defects?
YES
Replace the ECU.
– +
ELEC
NO
Properly connect or
repair the 2WD/4WD
selecting system wir-
ing.