Spicer Single Drive Axles Service Manual: Single Reduction & Single Reduction with Differential Lock - Manual (Page 47)

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Axle Housing
Ser
vice Procedure
Install New Axle Housing Breather - (Metal and Plastic)
Spicer uses an axle housing breather that consists of a fitting,
hose, and clamp assembly. This breather design has improved
resistance to water ingestion, and clogging caused by dirt,
ice or snow buildup around the base of the breather.
See installation instructions below (all views from rear).
Procedure -
1. Install fitting in breather hole.
2. Tighten fitting finger tight.
3. Using a 3/4” wrench:
Metal only: Rotate the fitting at least 1/2 turn until nipple
points to rear.
Plastic only: Tighten until one thread is showing.
4. Insert hose onto fitting, long end down.
5. Push hose firmly against fitting. Rotate hose to point
down.