Spicer Single Drive Axles Service Manual: Single Reduction & Single Reduction with Differential Lock - Manual (Page 42)

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Wheel Differential Lock
Shift Fork Adjustment - Type 1 Axles
Procedure -
1. With clutches disengaged, adjust position of shift
fork on pushrod to set a clearance of .120"
(3.05mm) between the clutch teeth.
2. Adjust as follows: Place two .120" (3.05mm) feeler
gauges (one on each side of the clutches) between
the tips of the clutch teeth. Slide shift fork on push-
rod to set clutch clearance. Working through carrier
pipe plug opening, tighten shift fork cap screw to 12-
15 lbs.ft. (16-20 N•m) torque.
3. Check differential lock clutch engagement by one of
the following methods:
Air Pressure Engagement: Apply air pressure (80-120
psi) to shift cylinder port to engage clutches.
Manual Engagement: Install an M12x1.5 bolt, over
38mm (1.5") long, in the cylinder air port to manually
engage clutches.
Note: Hand-tighten the bolt. Over-torquing may cause
damage to the shift unit. To facilitate hand-tightening,
lubricate bolt threads with axle lube.
4. Correct Fork Adjustment: Fork adjustment is correct
when clutch curvic teeth are fully engaged with the
fork free when moved by hand (see illustration).
When air pressure is released or manual bolt is
removed, the shift assembly should disengage
freely.
5. Recheck the .120" (3.05mm) clutch teeth clearance
with shift cylinder fully disengaged. If not correct,
readjust fork position (see Steps 1 and 2).
6. With differential lock correctly adjusted, coat pipe
plug with sealant and install plug in carrier shift box.
7. Install selector switch and plastic washer in carrier
shift box. Torque switch to 10-12 lbs.ft. (14-16
N•m).
8. Check Selector Switch Operation: Check switch
electrically with an ohmmeter or continuity tester.
Switch should close (show continuity) when
clutches are engaged and should open (no continu-
ity) when clutches are disengaged.
0.120"
0.120" (3.05mm)
Two 0.120" (3.05mm) feeler gauges