T M 9 - 2 3 2 0 - 2 7 9 - 3 4 - 1
Transmission Maintenance Instructions (Cont)
7 - 2 . G E N E R A L M A I N T E N A N C E I N S T R U C T I O N S ( C O N T ) .
b. Follow these cleaning instructions when working on the transmission.
All parts must be-clean to permit effective inspection. During assembly no dirt or foreign
material can be allowed to enter the transmission. Even minute particles can cause malfunction
of close-fit parts, such as valves.
W A R N I N G
Adhesives, solvents, and sealing compounds can burn easily, can give off harmful
vapors, and are harmful to skin and clothing. To avoid injury or death, keep away
from open fire and use in well-ventilated area. If adhesive, solvent, or sealing
compound gets on skin or clothing, wash immediately with soap and water.
All transmission metallic parts, except bearings and friction-faced clutch plates, should be
cleaned thoroughly with dry cleaning solvent or by steam cleaning method. Do not use caustic
soda solution for steam cleaning. Use only dry cleaning solvent to clean friction-faced clutch
W A R N I N G
Compressed air used for cleaning and drying purposes will be reduced to 30 psi
(207 kPa) and used only with adequate chip guarding and personal protection
equipment, goggles, shield, and gloves.
Bearings should drip and air dry, then be oiled. Other parts should be dried with compressed air.
Steam cleaned parts should be oiled immediately after drying to prevent rust.
Clean oil passages by working a piece of soft wire back and forth through the passages and
flushing with dry cleaning solvent. Dry passages with compressed air.
Examine parts, especially oil passages, after cleaning to make certain they are entirely clean.
Reclean parts if necessary.
c. Follow these inspection instructions when working on the transmission.
Inspect surfaces in contact with gaskets, packings, or seals for nicks, burrs, or scratches. Remove
any defect before assembly.
Before inspection, oil bearings lightly with same type of oil used in transmission to prevent
damage to bearings.
Inspect bores for wear, scratches, grooves, burrs, and dirt. Remove scratches, grooves, and burrs
with crocus cloth. Remove foreign matter. Replace deeply scratched or grooved parts.
Inspect housings and other cast parts for cracks.
Inspect machined surfaces for damage that could cause oil leakage or other malfunction. Correct
damage with crocus cloth, if possible, or replace defective parts.
Inspect gears for scuffed, nicked, burred, worn, or broken teeth. If defect cannot be removed
with soft stone, replace gear.
Inspect thrust face of gears for scoring, scratches, and burrs. Remove defects with soft stone. If
scratches and scoring cannot be removed with soft stone, replace gear.
Inspect splined parts for stripped, twisted, chipped, or burred splines. Remove burrs with soft
stone. Replace part if other defects are found. Spline wear is not considered defective except
where it affects tightness of an assembly such as driveline flanges.
Inspect retaining rings for nicks, distortion, and looseness. Retaining ring must snap tight in
groove for proper functioning. Replace retaining ring if any defects are found.
Inspect springs for signs of overheating, permanent set, or wear due to rubbing adjacent parts.
Replace spring if any of these defects are found.
Inspect friction clutch plates (internal-splined plates) for burrs, embedded metal particles,
severely pitted faces, loose facings, excessive wear, cracks, distortion, and damaged spline teeth.
Remove burrs using soft stone. Replace clutch plates which have other defects.
Inspect steel clutch plates (external-tanged plates) for burrs, scoring, excessive wear, distortion,
embedded metal, galling, cracks, breaks, and damaged tangs. Remove burrs and minor surface
defects using soft stone. Replace clutch plates which have other defects.