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 TM 55-1905-217-34
are damaged, check teeth of mating gear thoroughly for similar damage. Smooth out minor irregularities in
gear teeth with fine polishing stone or wheel. Replace any gear that is broken or excessively worn.
(5) Check that gear shafts are true and free from nicks, grooves, and scoring. Minor scratches may be
smoothed out with fine abrasive cloth or stone except on bearing surfaces. If bearing surfaces are damaged,
gear must be replaced.
(6) Check shaft keys for tight fit in corresponding keyways in both the shafts and gears. Replace if loose.
(7) Check condition of driving and driven plates. Replace plates if excessive wear is apparent on teeth
or on friction faces. Smooth out minor nicks or scratches. Check condition of piston seals and sealing
surfaces. Clean up minor scoring and remove nicks and sharp edges from grooves.
(8) Weld broken gear cases and covers, using standard welding techniques, provided that repair can be
made without misaligning bearing or shaft supporting members. Any broken part that could affect gear or shaft
alignment when repaired must be replaced.
e. Lubrication.
(1) Lubricate hydraulic system seals and packings liberally with hydraulic oil before assembling.
lubricant before assembling. Lubricate bearing in winch support pedestal after assembly with waterproof
antifriction bearing grease. Lubricate until grease is visible outside seal on winch shaft. Fill gear reducer after
assembly with SAE 90 gear lubricant to oil level plug on side of gear case.
f. Reassembly.
(1) Reassemble in the reverse order of disassembly. Use the following torque values:
Torque Range
Thread Size
(inch-pounds)
10-32
20-25
1/4-20
50-70
1/4-28
50-70
5/16-18
70-90
3/8-16
160-185
7/16-14
235-255
/2 -13
400-480
9/16-12
500-700
5/8-11
700-900
3/4-10
1150-1600
(2) Observe the following precautions during reassembly:
(a) Use a seal expanding tool when sliding oil seals over shafts.
(b) Be especially careful when installing cluster gear shafts in gear reducer to avoid damaging preformed
packings as they pass through needle bearings inside gears.
(c) Install oil seal in winch support pedestal with lip toward winch to keep dirt, water, and other foreign
material from entering the bearing.
4-17. Winch Hulls 8520 thru 8560 and 8580 thru 8618.
a. Description.
(1) The Gearmatic hydraulic winch consists of a primary drive housing and a final drive housing fastened
to a winch base by dowel bolts which hold the housings concentric. The winch barrel is carried on anti-friction
bearings between the drive housings (fig. 4-41).
4-61
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