TM9-2350-261-20-1
b. CASTINGS.
(1) Replace all cracked or broken castings.
WARNING
Dry cleaning solvent P-D-680 is toxic and flammable. Always use in an open area
with good air flow, away from sparks, heat, or flames. Wear goggles and gloves. Do
not breathe vapors. Avoid contact with skin, eyes, and clothes. If you get dizzy
while using solvent, breathe fresh air and get medical help. If solvent gets on
hands, wash them. If solvent gets in eyes, flush eyes with fresh water and get
medical help immediately. Keep fire extinguisher nearby.
(2) Repair minor damage to machined surfaces of castings with crocus cloth. Replace any part with
defects that cannot be corrected or which will impair function.
(3) Repair minor surface bends by working bent surface of casting across sheet of crocus cloth on surface
plate. Replace bent castings which would impair assembly or function.
c. BALL BEARINGS. See TM 9-214 for inspection and maintenance for ball bearings.
d. NEEDLE ROLLER BEARINGS. See TM 9-214 for inspection and maintenance of needle roller bearings.
e. BUSHINGS AND BUSHING-TYPE BEARINGS. Replace. Replace bushings and bushing-type bearings if they are
loose, scored, or have color change due to heat. When you replace bushings and bushing-type bearings,
check nearby parts for damage or wear.
f. OIL SEALS. Oil seals must be replaced when thin feather edge is damaged or when seal material is brittle.
(1) Press damaged oil seal from casting. Be careful not to damage bore.
W A R N I N G
Dry cleaning solvent P-D-680 is toxic and flammable. Always use in an open area
with good air flow, away from sparks, heat, or flames. Wear goggles and gloves. Do
not breathe vapors. Avoid contact with skin, eyes, and clothes. If you get dizzy
while using solvent, breathe fresh air and get medical help. If solvent gets on
hands, wash them. If solvent gets in eyes, flush eyes with fresh water and get
medical help immediately. Keep+ fire extinguisher nearby.
(2) When oil seal bore is damaged so an oil-tight seal is impossible, replace casting or adapter. Remove
alight nicks, burs, and scratches with crocus cloth dipped in dry cleaning solvent (Item 13, App c).
(3) Install new oil seal in casting bore or adapter using suitable oil seal replacement tool.
g. GREASE SEALS, PREFORMED PACKINGS, AND GASKETS.
(1) Replace seals which show signs of wear, brittleness, cracks, and damage.
(2) Replace defective lip seals, springs, and seal shells.
(3) Preformed packings and gaskets should be replaced when removed unless otherwise stated in the
maintenance task. They should not be reused.
2-35
