4 X 2 Gear Selector
32
6.22. The yellow wire from the button activates the dif-
ferential lock solenoid. The green wire from the
solenoid provides a constant ground. Check for
power and vacuum at the upper port when ener-
gized. See Figure 6.22.
6.23. If the differential lock fails to engage, and the
vacuum and electrical systems appear to be
functioning correctly, isolate the mechanical por-
tion of the differential lock, and check it for free-
dom of movement and correct operation.
See Figure 6.23.
6.24. With the engine turned off, and the parking brake
released, remove the cotter pin and clevis pin
that secure the differential lock actuator arm to
the clevis on the vacuum actuator.
6.25. Engage and disengage-engage the differential
lock manually to test its function.
6.26. It will probably be necessary to rotate the input
shaft of the transmission in order to allow the dif-
ferential lock to engage. This can be done by
grasping the driven clutch and rotating it.
6.27. If the unit shows signs of tampering or previous
repair, check for correct alignment and adjust-
ment. See Figure 6.27.
6.28. The movement necessary to engage the differ-
ential lock should coincide with the action of the
vacuum actuator.
6.29. If the vacuum system, electrical system, and
adjustment are correct, there may be an internal
transmission problem.
6.30. If the gear selector fails to operate, and the vac-
uum and electrical systems appear to be func-
tioning correctly, isolate the mechanical portion
of the transmission, and check it for freedom of
movement and correct operation.
6.31. With the engine turned off, and the parking brake
released, move the manual over-ride lever to
shift gears. It should firmly engage forward and
reverse.
Figure 6.22
Green
ground wire
Yellow wire with white
trace: hot to energize
Figure 6.23
Vacuum actuator disconnected from
the differential lock actuator arm
Engage
Disengage
Figure 6.27
Splined shaft
Clamp bolt on arm
Adjustable
length
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