Analysis of Leakage
Analysis of LeakageClean up the leaking area enough to identify the exact source. An axle leak can be caused by the following:
^ Axle lubricant level is too high.
^ Worn or damaged axle shaft seals.
^ Differential housing is cracked.
^ Flange yoke seal is worn or damaged.
^ Pinion flange is scored or damaged.
^ Axle cover is not sealed.
^ Vents plugged.
Make sure the axle lubricant level for both nodular iron and aluminum housings is 3 - 5 mm (1/8 - 3/16 inch) below the bottom of the fill hole.
Axle Vent
NOTE: If a plugged vent cannot be cleared, install a new vent.
A plugged vent will cause excessive seal lip wear due to internal pressure buildup. If a leak occurs, check the vent. Make sure the vent hose is not kinked. Remove the hose from the vent nipple and clear the hose of any foreign material. While the hose is removed, pass a length of mechanics wire or a small diameter Allen wrench in and out of the vent to clean it. Connect the hose when done.
Flange Yoke Seal
Leaks at the axle drive pinion seal originate for the following reasons:
^ Damaged seal.
^ Worn seal journal surface.
Any damage to the seal bore (dings, dents, gouges, or other imperfections) will distort the seal casing and allow leakage past the outer edge of the axle drive pinion seal.
The axle drive pinion seal can be torn, cut, or gouged if it is not installed carefully. The spring that holds the axle drive pinion seal against the pinion flange may be knocked out and allow leakage past the lip.
Metal chips trapped at the sealing lip can cause oil leaks. These can cause a wear groove on the pinion flange and pinion seal wear.
A new pinion flange must be installed if any of these conditions exist.
If a seal leak occurs, install a new seal and check the vent and the vent hose to make sure they are clean and free of foreign material.
Differential Seals
Stub shaft pilot bearing housing seals are susceptible to the same kinds of damage as axle drive pinion seals if incorrectly installed. The seal bore must be clean and the lip handled carefully to avoid cutting or tearing it. The seal journal surface must be free of nicks, gouges and rough surface texture.