Bushings, Bushing-type Bearings, and Thrust Washers.

TM 9-2520-249-34&P

(1) Inspect splined parts for twisted or

NOTE

broken splines, burs and excessive wear.

If threads are stripped, discard the part

(2) Remove burs, using a soft honing

unless it can be satisfactorily repaired by

stone. Replace parts which have twisted or broken

installing an insert.

splines and excessive wear.

(5) Replace housings or other cast parts

h. Clutch Disks.

that are cracked or broken.

(1) Inspect nonmetallic

disks

for

b. Roller or Ball Bearings. Refer to TM 9-214

excessive wear, cracks, breaks, and deep scoring.

for proper cleaning and inspection procedures.

Replace disks if such defects are found.

c. Needle-type Roller Bearings. Inspect the

(2) Inspect bronze-faced steel disks for

bearings for free and smooth rotation, broken or missing

burs, imbedded metal particles, severely pitted faces,

rollers, and tightness of fit in the bore. If defects are

excessive wear, cracks, distortion, and damaged spline

found, replace the bearing.

teeth.

Remove burs, using a soft honing stone.

d. Bushings, Bushing-type Bearings, and

Replace disks which have other defects.

Thrust Washers.

(3) Inspect steel disks for burs, scoring,

(1) Inspect bushings and bushing-type

excessive wear, distortion, imbedded metal, galling,

bearings for size, scoring and out-of-roundness, burs,

cracks, breaks, and damaged spline teeth. Remove

sharp edges and evidence of seizing. Minor scores,

burs and minor surface irregularities, using a soft honing

sharp edges and scratches may be removed with crocus

stone. Replace disks which have other defects.

cloth. Out-of-round, deeply scored or worn parts should

Threaded Parts.

be discarded.

(1) Inspect all threaded parts for stripped

(2) Do not remove bushings and bushing-

or damaged threads and burs.

type bearings unless replacement is necessary.

(2) Replace all parts which have stripped

Removal usually damages these parts.

threads or damage which cannot be repaired by chasing

(3) Remove bushings and bushing-type

the threads with a tap or die of the proper size or by

bearings by using a puller or press when possible.

installing an insert.

Bushings in blind holes may require removal by sawing

Snaprings. Inspect snaprings for nicks,

or the use of a narrow cape chisel.

burs, distortion, and wear. Discard snaprings which are

CAUTION

defective.

If necessary to cut a bushing, do not damage

k. Springs.

Inspect springs for wear,

the bore into which it fits.

distortion, breaks, evidence of overheating, and loss of

(4) Inspect thrust washers for wear,

tension or compression. Discard defective springs.

distortion, scores and burs. Correct minor defects but

Refer to spring information in Repair standards tables in

replace parts that are worn, scored or deformed.

chapter 7.

e. Oil Seals, Preformed Packings and

Shafts and Spindles.

Gaskets.

(1) Inspect shafts and spindles for

(1) Inspect hook-type searings for wear,

excessive wear, bending, scores, cracks, burs, and

distortion and broken hooks.

Replace defective

obstructed oil passages.

sealrings.

(2) Remove burs and minor surface

(2) Inspect composition-type sealrings or

irregularities with crocus cloth or a soft honing stone.

packing for wear, brittleness, cracks, cuts, deformation,

Remove obstructions by probing with soft wire or with

and deterioration. Replace defective seals.

compressed air. Discard parts with other defects.

(3) Inspect lip-type seals for cracks, wear,

m. Ball-type Valves.

cuts, and brittleness. Inspect springs and seal shells.

(1) Inspect steel balls for rust, pitting, or

Replace any seal found defective.

grooving. Inspect nylon balls for nicks, scratches,

CAUTION

grooving or chipping. Inspect nonmetallic balls for

Removal of a seal will usually damage it.

nicks, scratches, grooving, chipping or cracking. Discard

Inspect it rigidly before reusing it.

balls which will not seat properly.

(4) Replace all flat-type gaskets.

(2) Inspect ball seats for wear and pitting.

Gears.

Reseat by lapping with the proper size ball. On seats

(1) Inspect gears for burs, wear, broken

where a nonmetallic ball is used, a steel ball of the

teeth and pitting at tooth contact areas.

same size may be used for lapping. Discard parts in

(2) Remove burs, using a soft honing

which the seats cannot be restored.

stone. Replace gears that are excessively worn or

n. Spool-type Valves.

pitted.

(1) Inspect valves for wear, burs, scoring,

g. Splined Parts.

and evidence of sticking. Try valves in their bores. All

5-2