Rear Axle Lubrication Motor Leakage Issues Caterpillar

Problem:

Trucks that are equipped with the 173-5942 Rear Axle Lubrication Motor have experienced leakage. Improper seal bore machining from the factory has allowed oil to leak from the weep hole on the lubrication motor. If the weep hole is obstructed, oil could leak past the seals and into the rear axle housing.

Solution:

If the 173-5942 Rear Axle Lubrication Motor is not leaking, it is recommended that the rear axle lubrication motor not be replaced at this time.

If the 173-5942 Rear Axle Lubrication Motor is leaking, there are two repair options that are available.

Repair Option 1

It is recommended that if the 173-5942 Rear Axle Lubrication Motor is leaking, that it be replaced with the new 180-6146 Rear Axle Lubrication Motor and 6V-1197 Seal. The new 180-6146 Rear Axle Lubrication Motor will bolt up as a direct replacement for the old lubrication motor. However, because of the larger outlet port (1 inch) on the new lubrication motor, it will be necessary to replace the old 158-8007 Hose Assembly with a new 175-7724 Hose Assembly. To replace the old hose assembly with the new hose assembly, refer to SEBP2792; Parts Identification/Power Train/149-3072 Pump & Mounting Group - Rear Axle Oil - Brake Actuation. Refer to Table 1 for a list of parts that will need to be changed.

The new 175-7724 Hose Assembly may not be available until later. If a new hose assembly is needed before the new 175-7724 Hose Assembly is available, you will need to have one made. The overall length of the new 175-7724 Hose Assembly is 1740 1 15 mm (68.5 1 .6 inch). Refer to Table 2 for a list of components that are necessary in order to construct a suitable hose assembly.

After the old 173-5942 Rear Axle Lubrication Motor has been replaced, send the lubrication motor to the following address:

Please include the following information as well:

* Serial number of the truck that it was removed from.

* Date removed

* Hours on the truck

* The name of the dealership as well as a contact and a phone number

Repair Option 2

The lip seal on the drive gear shaft may not be installed correctly resulting in a leak. Consult with product support personnel prior to making any repair to the lip seal on the rear axle lubrication motor. The phone number for the 797 product support personnel cellular phone in Decatur is (217)-433-0798.

In order to replace the lip seal, install the 175-6247 Seal Kit into the 173-5942 Rear Axle Lubrication Motor. Measure the seal bore of the 173-5942 Rear Axle Lubrication Motor. The dimensions should be:

Diameter: 50.698 mm (1.996 inch) to 50.749 mm (1.998 inch)

Depth: 29.972 mm (1.18 inch) (from pilot to bottom of pocket)

Prior to installing the inner seal, coat the outside of the seal with 4C-9506 Retaining Compound. When installing a seal it is important to ensure that the seal is pushed just deep enough to allow the snap ring to snap into the groove. It is possible to push the seal in deep enough to damage the seal, especially if the distance from the bottom of the snap ring groove to the bottom of the pocket is less than the width of the seal.

To minimize the possibility of crushing the seal, start the seal into the bore. Before the seal exposes the snap ring groove, put the snap ring into the bore and push on the snap ring and the seal together. Only push far enough to allow the snap ring to snap into the snap ring groove and then stop pushing.

After the inner seal and the snap ring have been installed, install the outer seal. Prior to installing the outer seal, coat the outside of the seal with 4C-9506 Retaining Compound.

NOTE: When installing the 173-5942 Rear Axle Lubrication Motor it is possible to install the lubrication motor incorrectly. The words "Output" and "Input" are either cast or stamped into the body of the lubrication motor. When the lubrication motor is installed correctly, the word "Output" will face towards the right side duals and the word "Input" will face towards the differential.

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