Cleaning, Inspection, and Repair - TM-10-3930-618-340074

When teeth are worn out of shape, or gear is cracked,

CAUTION

replace the gear.

Parts cleaned by steam must be

(h) rings for spring tension, wear, nick,

protected with an even coating of OE

or bur. Replace a defective ring.

10 oil applied immediately after

(i) Springs for discoloration from heat,

drying with filtered compressed air.

permanent set, or wear. Replace a defective spring.

Never dry bearings with compressed

(j) Mounting hardware for burs or other

air.

damage. Chase a burred external thread with proper

NOTE

size die. Chase a burred internal thread with proper size

All metallic parts, except bearings,

tap. Replace defective mounting hardware.

may be cleaned in dry cleaning

(k) for burs, twist, or chip, and wear that

solvent (Fed P-D-680), in diesel fuel

affects tightness of fit. When bur or chip cannot be

(Fed VV-F-8001, or may be cleaned by

removed with a soft stone, or wear is excessive, replace

the steam cleaning method. Wash

the defective part.

bearings only in dry cleaning solvent

(l) Inspect sump screen for clogged or

(Fed P-D-6801. When grease has

damaged screen.

hardened in used bearings. always

NOTE

soak them in the solvent for several

Thoroughly clean the intake screen

hours, for ease in cleaning.

and spring. In addition to soaking

CAUTION

and washing, air streams should be

Protect all parts from contamination

directed from the outside toward the

after cleaning, and before inspection

inside to remove material clogged in

or reassembly, by an even coating of

the screen and spring.

the oil to be used in the converter (LO

(m) Inspect drive discs, pistons and

53930-618-12).

Keep oiled parts

drum for wear or damage, Should any of these parts

covered with clean paper or cloth,

show evidence of excessive wear or scored marks, they

and

handle

carefully

during

should be replaced.

inspection

avoid

leaving

(n) Inspect control valve plungers and

fingerprints on machined surfaces.

spools for score marks - clean up with crocus cloth or

(1) Clean all metallic parts carefully, paying

replace as required. Check spring for damage. Replace

particular attention to oil passages by running a clean

oil seals, seal rings and gaskets.

wire back and forth through the passage, blow dry with

c. Reassembly. To reassemble the transmission,

filtered compressed air, then coat all parts with an even

reverse the disassembly procedure. During reassembly,

coating of oil. (See caution above).

note the following:

(2) Inspect all parts for the following:

(1) Control

valve

assembly.

Reverse

(a) Bores for wear, burs, scratches, or

disassembly procedure making sure plungers and spools

grooves. Remove minor burs and scratches with crocus

operate freely and retainer at both forward - reverse

cloth.

Replace parts that are deeply grooved or

plunger and inching valve plunger are installed with

scratched.

angled edges facing back of valve body.

(b) Mounting faces for nicks, burs, or

(2) Drum and disc assembly.

scratches. Remove such defects with crocus cloth or a

(a) Install reverse drive disc, piston, and

soft stone.

cylinder. Make sure cylinder and piston does not bind in

drum or on dowel pins. Install large snapring holding

threads. Chase a damaged thread with correct size tap.

cylinder in place.

(d) Castings for cracks or other

(b) Turn drum over and install springs,

damage. Replace a cracked casting.

drive disc, piston and cylinder.

(e) Sleeve bearings and thrust washers

for scoring, sharp edges, roundness, burs, or

Apply pressure on turbine shaft, making sure cylinder

discoloration from overheating. Remove scoring with

does not bind in drum or on dowel pins. Install large

crocus cloth. Burs and sharp edges may be removed

snapring holding cylinder in place and release pressure

with a scraper.

Excessive wear, out-of-round, or

in arbor press.

overheated items require replacement.

(d) should be exercised when installing

(f) seals and gaskets for wear, cuts,

converter housing on turbine shaft of disc drum, so that

and deterioration. Replace defective seals and rings.

misalignment does not occur during assembly. Make

Replace all composition gaskets.

sure snapring holding converter housing .to turbine shaft

(g) teeth for wear, nicks, or burs. Gear

is properly seated.

thrust face for scores, nicks, or burs, and gears for

cracks, or breaks. When burs, scores or nicks cannot

be removed with a soft stone, replace the defective gear.

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