TM 5-3810-300-24 & P2
It is impossible to overstress the importance of careful and thorough inspection of drive unit parts prior to reassembly.
Thorough visual inspection for indications of wear or stress, and the replacement of such parts as are necessary will
eliminate costly and avoidable drive unit failure.
A. Inspect all bearings, cups and cones, including those not removed from parts of the drive unit, and replace if
rollers or cups are worn, pitted or damaged in any way. Remove parts needing replacement with a suitable puller
or in a press with sleeves. Avoid the use of drifts and hammers. They may easily mutilate or distort component
B. Inspect hypoid gears for wear or damage. Gears which are worn, ridged, pitted or scored, should be replaced.
When necessary to replace either the pinion or gear of hypoid set, the entire gear set should be replaced.
C. Inspect the differential assembly for the following:
1. Pitted, scored or worn thrust surfaces of differential case halves, thrust washers, spider trunnions and
differential gears. Thrust washers must be replaced in sets. The use of a combination of old and new
washers will result in premature failure.
2. Wear or damage to the differential pinion and side gear teeth. Always replace differential pinions and side
gears in sets.
D. Inspect axle shafts for signs of torsional fractures or other indication of impending failure.
A. In the interest of safety and preserving the service life of drive axle assemblies, Rockwell-Standard recommends
that drive axle assemblies not be repair welded. Repair welding can detract from the structural integrity of a
component, particularly as to heat treated parts where the benefit of heat treatment may be nullified by the
Since it can be extremely hazardous and detrimental to repair weld components of any kind, repair welding can
be approved only where stringent controls are imposed and equipment, customarily located only at
manufacturing facilities, is employed, so as to minimize the potentially detrimental effects of repair welding.
In deciding whether to repair or scrap any damaged part, always keep in mind that we, as manufacturers, never
hesitate to scrap any part which is in any way doubtful.
B. Hex nuts with rounded corners, all lock washers, oil seals and gaskets should be replaced at the time of
Use only genuine Rockwell-Standard replacement parts for satisfactory service. For example, using gaskets of
foreign material generally leads to mechanical trouble due to variations in thickness and the inability of certain
materials to withstand compression, oil, etc.
C. Remove nicks, mars and burrs from machined or ground surfaces. Threads must be clean and free to obtain
accurate adjustment and correct torque. A fine mill file or India stone is suitable for this purpose. Studs must be
tight prior to reassembling the parts.