Repair - TM-9-2815-213-340017

*TM 9-2815-213-34

(2) Replace all castings which do not conform to

(5) Check all castings for conformance to applicable

tolerances specific, repair and rebuild standards in

repair and rebuild standards in paragraph 3-174.

b. Ball Bearings. Refer to TM 9-214 for inspection

paragraph 3-174

(3) Repair minor damage to machined surfaces with

of ball bearings. Check all bearings for conformance to

a fine mill file or crocus cloth dipped in dry-cleaning

the applicable repair and rebuild standards in paragraph

solvent or mineral spirits paint thinner. Replace all

3-174.

c. Studs. Inspect all studs for stripped or damaged

castings on which machined surfaces are burred or

nicked to the point of impairing subsequent assembly or

threads, bent or loose condition and for evidence of

operation.

stretching.

(4) Repair minor warpage of mounting flanges and

d. Gears.

gasket surfaces by working surface across a sheet of

NOTE

crocus cloth held tightly on a surface plate or similar flat

There are no established wear limits on

surface. Replace castings having flanges which are

gear teeth. Good judgement is required

warped to the point of impairing assembly or operation.

to determine need for replacement.

(5) Repair damaged pipe or cap screw threads in

(1) Inspect gears for cracks using magnaflux

tapped holes with a tap, or repair threaded opening by

equipment. When magnaflux equipment is not available,

installing a threaded insert.

use magnifying glass and strong light.

NOTE

(2) Inspect all gear teeth for wear, sharp fins, burrs,

Pipe plug threads in castings must be in

and galled or pitted surfaces.

good condition to prevent oil and water

(3) Check all gears for conformance to applicable

leakage.

repair and rebuild standards.

b. Ball Bearings.

e. Bushings and Bushing-type Bearings.

(1) Replace all galled, pitted, or damaged ball bearings.

(1) Check all bushings and bushing-type bearings

(2) Replace all ball bearings which do not conform to

for secure fit in their respective casting or mating part

tolerances specified in the repair and rebuild standards

and for evidence of heating which may be indicated by

in paragraph 3-174.

discoloration of bushing or bearing surface.

c. Studs. Replace all bent or loose studs, or studs

(2) Inspect bushings and bushing-type bearings for

showing evidence of stretching. Repair minor thread

wear, burrs, nicks, or out-of-round condition.

damage with a thread chaser. Replace all studs having

(3) Check for dirt in lubricating holes or grooves of

stripped or several damaged threads. Remove and

bushings or bushing-type bearings. Holes and grooves

replace studs as outlined in (1) and (2) below.

must be clean and free from damage to insure proper

lubrication.

CAUTION

(4) Check all bushings and bushing-type bearings

Avoid damage to casting while using

for conformance to applicable repair and rebuild

welding equipment. Refer to TM 9-237

standards in paragraph 3-174.

for welding instructions.

f. Oil Seals. Metal encased oil seals should be

(1) Removal. Using stud extractor, back studs out slowly

replaced unless inspection indicates the seal is not

to avoid heating and possible seizure. When studs are

damaged.

broken off too short to use stud extractor, drill stud and

(1) Inspect feather edge of oil seal for damage.

extract with a suitable remover. Short studs may also be

(2) Check seal for loss of pliability and resiliency.

removed by welding a piece of bar stock or a nut to stud

g. Core Hole Expansion Plugs. Inspect core hole

and removing it with a wrench.

(2) Replacement. Only standard studs are supplied for

expansion plugs for evidence of leakage. Replace plugs

if there is evidence of leaking or damage.

replacement in steel or iron castings. Unless threads in

castings are damaged beyond repair, use standard

2-7.

Repair

studs. If threaded openings are damaged and retapping

a. Castings.

will not clean up the threads, drill the tap opening in

(1) Replace all cracked castings.

castings and install a suitable threaded insert.

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