Spicer Single Drive Axles Service Manual: S170, S190, S590 - Manual (Page 63)

59
Towing
Guide
Towing Guide
Proper Vehicle Towing
Without Wheel Differential Lock
Lift the drive wheels completely off of the ground or damage
will occur.
Do not lift the front wheels (non-drive wheels). This alters
the oil’s position in the drive axle, draining it away from the
drive pinion and its bearings. If the pinion is rotated under
these conditions for any period of time, bearings will over-
heat resulting in axle damage or failure.
If it is impossible to lift the drive wheels, remove all axle
shafts to prevent gear rotation and cap the wheel hubs to pre-
vent loss of lubricant and a possible road hazard. See the fol-
lowing section Proper Vehicle Towing with Wheel Differential
Lock for removal procedure.
With Wheel Differential Lock
Follow this procedure to remove all axle shafts preventing
gear rotation with the drive wheels and possible lubrication
damage:
1. Engage the wheel differential lock, indicator light is
on (move vehicle to verify engagement).
2. Shift transmission into neutral.
3. With vehicle stationary, release the air pressure on
the wheel differential lock shift system and apply the
parking brake.
4. Disconnect the air supply and fitting at the shift
cylinder.
5. Install the shipping capscrew 128642 (0.250 X 18 X
1.5") NPSM screw. GM models require part number
128274 (M12 X 1.5 X 38mm) screw. Tighten cap-
screw to manually engage the wheel differential lock
until the indicator light is on and the differential lock
is completely engaged.
6. Remove the axle shafts.
7. Install temporary cover on hub to prevent contami-
nation entering and also to prevent the loss of lubri-
cant.
WARNING