20. FRONT AXLE SHAFT UNIVERSAL JOINTS and STEERING KNUCKLES. Lubricate universal joints every 3,000
miles (4,827 km) or once every three months, whichever occurs first. Lubricate steering knuckles with GAA every 6,000
miles (9,654 km) or once every six months, whichever occurs first, using a low pressure lubrication gun. If operating
conditions are severe or abnormal, service at 1,000 miles (1,609 km) or once every month, whichever occurs first.
21. BRAKE WEDGE and AIR CHAMBER: BRAKE SPIDER, SELF-ADJUSTER MECHANISM, AND WEDGE
ASSEMBLY. Clean and lubricate (with GAA) areas of spider and hardware that contact the brake shoes. Disassemble,
clean and lubricate the self-adjuster mechanism. Clean and lubricate the wedge head, rollers and ramps in the
plungers. Clean and lubricate every 6,000 miles (9,654 km). If operating conditions are severe or abnormal, service
at 3,000 miles (4,827 km) or once every three months, whichever occurs first, or when any of the following occur:
• Seals are replaced
• Plungers are removed
• Brakes are relined
• Grease becomes contaminated or hardened
22. FRONT and REAR AXLE INNER WHEEL BEARINGS. Repack inner wheel bearings with GAA every 12,000
miles (19,308 km), when semiannual PMCS inspection of service brakes reveals oil leak from inner hub, or whenever
wheel end assemblies are taken apart for other maintenance (para 10-2).
23. 11K SRW CABLE ROLLER FAIRLEADS. Lubricate with GAA every 6,000 miles (9,654 km) or once every six
months, whichever occurs first, using a low pressure lubrication gun. If operating conditions are severe or abnormal,
service at 1,000 miles (1,609 km) or once every month, whichever occurs first.
WARNING
• Dry Cleaning Solvent (P-D-680) is TOXIC and flammable. Wear protective goggles and gloves; use
only in well-ventilated area; avoid contact with skin, eyes, and clothes, and do not breath vapors.
Keep away from heat or flame. Never smoke when using solvent; the flashpoint for Type I Dry
Cleaning Solvent is 100°F (38°C) and for Type II is 138°F (50°C). Failure to comply may result in
serious injury or death to personnel.
• If personnel become dizzy while using cleaning solvent, immediately get fresh air and medical help.
If solvent contacts skin or clothes, flush with cold water. If solvent contacts eyes, immediately
flush eyes with water and get medical attention. Failure to comply may result in injury to
personnel.
24. FRONT LIFTING BEAM. Remove left and right lifting beams and clean with Dry Cleaning Solvent (SD P-D-680)
(Item 71, Appendix D) or equivalent, every 6,000 miles (9,654 km) or once every six months, whichever occurs first.
Apply a light coat of GAA to lifting beams. If operating conditions are severe or abnormal, service at 1,000 miles (1,609
km) or once every month, whichever occurs first.
25. AIR DRYER. Service air dryer (para 23-6) every 12,000 miles (19,308 km) or annually, whichever occurs first.
Change 1
H-21/(H-22 Blank)
TM 9-2320-365-20-5
