4-16. GENERAL CLEANING INSTRUCTIONS (continued).
Steam cleaning creates hazardous noise levels and severe burn potential. Eye,
skin, and ear protection is required. Failure to comply with this warning may
result in injury to personnel.
Exterior Parts. Steam-cleam all exterior parts thoroughly before removing. This will make inspection and
Degreasing Machine. Use a degreasing machine to remove heavy grease and oil accumulations from metal
Passages. After removing parts from degreasing machine and before coating with rust preventive, check all
oil passages and cavities for dirt or blockage. A thin, flexible wire should be run through oil passages to
make certain they are not clogged. Individual passages that are dirty may be cleared using a spray gun and
To prevent corrosion, parts should be dipped in rust-preventive compound within two
hours after degreasing.
Electrical Parts. Electrical parts, such as switches, that use insulating materials, should not be soaked or
sprayed with cleaning solutions. Clean these parts with a clean, lint-free cloth moistened with drycleaning
Hydraulic System. When cleaning hydraulic system parts, use a drycleaning solvent. Clean and dry parts
thoroughly to make sure no residue remains. If a coating of preservative is required before assembly, apply a
light film of preservative oil. If petroleum-free solvents are not available, use the same hydraulic fluid as
used in the truck system.
Sealing Surfaces. Inspect all surfaces in contact with gaskets, packing, or seals. Make sure there are no
nicks, burrs, or scratches. If any defect is found, remove or repair as outlined under "General Repair
Check bearings for rusted
or pitted balls, races,
Check balls and races for
brinelling, abrasion, and serious discoloration. Criteria for bearing rejection are as follows:
Cuts or grooves parallel to ball or roller rotation.
Fatigue pits (not minor machine marks or scratches).