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TM 5-2420-222-34
4-1.
CLUTCH ASSEMBLY MAINTENANCE (SERIAL NUMBERS 235786-235999) (Con’t).
WARNING
Dry cleaning solvent, P-D-680, is toxic and flammable. Always wear protective
goggles and gloves, and use only In a well-ventilated area. Avoid contact with
skin, eyes, and clothes, and DO NOT breathe vapors. DO NOT use near open
flame or excessive heat. The solvent's flash point is 100°F-138°F (38°C-59°C). If
you become dizzy while using cleaning solvent, immediately get fresh air and
medical help. If solvent contacts eyes, Immediately wash your eyes and get
medical aid.
CAUTION
Clutch disk, clutch disk assembly, pressure plate, and thrust ball bearing must
never be soaked In dry cleaning solvent. Soaking may damage parts.
2. Using rags dampened with dry cleaning solvent, wipe clutch disk, clutch disk assembly, pressure plate, and thrust ball
bearing. Dry parts thoroughly with clean, dry rags.
3.
Clean all other metal parts in dry cleaning solvent. Dry thoroughly with clean, dry rags.
4.
Inspect engine flywheel and ring gear (see paragraph 3-9).
5.
Inspect clutch disk assembly and pressure plate for cracks, breaks, and abnormal bends. Replace if defective.
6.
Using combination square and thickness gage, check driving surface of pressure plate at several locations to ensure
that it is flat. Flatness must be within 0.006 in. (0.152 mm).
7.
Inspect pilot ball bearing and thrust ball bearing (see TM 9-214).
8.
Inspect clutch disk for cracks, breaks, abnormal bends, or glazing of facing material. Using facing material above rivet
heads as an indicator of wear, replace clutch disk if rivet heads are flush with or just below surface of facing material.
9.
Inspect clutch disk hub spines for excessive wear. Slide clutch disk on clutch shaft. Clutch disk should slide on clutch
shaft with no restrictions.
10. Ensure that clutch disk does not rock back and forth or from side to side on clutch shaft. If clutch disk rocks In either
direction, use a new clutch disk and repeat steps 9 and 10 to determine if clutch disk or clutch shaft is worn.
11. If clutch shaft is worn or defective, replace clutch shaft (see paragraph 8-16).
12. Inspect three pressure plate springs for cracks, breaks, and abnormal bends. Using combination square, check
pressure plate springs for tilting.
13. Using spring tester and torque wrench, compress pressure plate springs to 1.812 in. (46.025 mm). It should take
293-295 lb (1303-1312 N) of force to compress pressure plate springs. Remove spring tester.
14. Using vernier calipers, check free length of pressure plate springs. Free length should be 2.516-2.520 in. (63.906-
64.008 mm).
15. Inspect all other metal parts for cracks, breaks, abnormal bends, and damaged threads. Restore damaged threads
using screw threading set. Replace all defective parts.
4-5
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