Lippert Components Trailer Axle (8-12K) - Manual (Page 9)

Rev: 04.18.2014
Page 9
Trailer Axle 8-12K Owners Manual FULL
Lubrication
Bearing Lubrication - Oil
Your axle bearings are lubricated with a SAE 80-90W hypoid gear oil. Periodically check and refill the hub as
necessary to the level indicated on the clear plastic oil cap. The oil can be filled through the cap by removing
the rubber plug. In order to check oil level, do so after unit has been parked for a few minutes.
Recommended Oil Lube for axle bearings:
Oil designation: SAE 90, SAE 80W-90, SAE 75W-90
Approved Sources
Union Oil Co. Unocal MP Gear Lube
Exxon Co. Gear Oil GX 80W-90
Mobil Oil Mobillube SHC 75W-90
Pennzoil Co.
Gear Plus 80W-90 GL-5
Gear Plus Super 75W-90
Oil Cap and Oil Seal
The clear plastic oil cap should be tightened to 25 ft-lbs. Over-tightening can damage the sealing o-ring and
cause an oil leak.
In order to remove hub/rotor assembly a gear puller may be required. The oil seal is a 2 part seal where the
inside diameter of the seal presses onto the spindle journal and the outside diameter of the seal presses into
the hub bore. Therefore a gear puller is the most efficient way to remove hub from spindle. A new oil seal
must be installed before reassembly or the old seal will leak upon re-installation and use. When reinstalling
a new oil seal, be sure to correctly orient the seal. Most are marked “AIR SIDE.” This side must not be placed
towards the oil and bearing or it will fail in service. Install new seal using a block of wood and hammer to
drive the seal in the seal bore square until the outer face of the seal is flush with the seal bore face. Do not
use permatex on rubber encased oil seals.