Copyright © 1996 General Motors Corp. 3–31
PREVENTIVE MAINTENANCE
PREVENTIVE MAINTENANCE
D. Slippage
†
/**
Excessive slippage and clutch chat-
ter in only one range
Clutch slipping in that range. Rebuild the specific clutch that is
slipping and replace piston seals.
Excessive fluid leakage in range
piston seals.
Overhaul clutch and piston assem-
bly.
Fluid leakage in valve components
for that particular range.
Replace or rebuild main control
valve body assembly. Refer to Para-
graph 6–6.
Trimmer valve stuck open. Replace or rebuild main control
valve body assembly. Check trimmer
valve for freedom of movement.
Refer to Paragraph 6–6.
Cycling priority valve. Replace or rebuild main control
valve body assembly. Inspect prior-
ity valve. Refer to Paragraph 6–6.
Slippage in all forward ranges Low fluid level. Add fluid to proper level. Refer to
Paragraphs 3–4 through 3–10.
Clutch main pressure low. Refer to Chart E, Low Pressure
Forward clutch slipping. Rebuild forward clutch and replace
piston seals. Refer to Paragraph 6–8.
Sealrings on front support hub bro-
ken.
Replace sealrings. Refer to Para-
graphs 5–3i and 7–8b.
Slippage in fourth range and reverse
only
Fourth clutch slipping. Rebuild clutch and replace piston
seals. Refer to Paragraph 6–11.
Trimmer valve sticking. Replace or rebuild main control
valve body assembly. Inspect trim-
mer valve. Refer to Paragraph 6–6.
Broken sealrings on center support
assembly hub.
Replace sealrings. Refer to Para-
graphs 6–12a and 6–12c.
Clutch piston sealrings cut. Replace sealrings. Refer to Para-
graphs 6–11a and 6–11c.
Check balls not seating in rotating
clutch housings.
Inspect check balls for contamina-
tion and proper operation. Refer to
Paragraph 4–5p.
†
If unit is modified for split shaft PTO, all external circuitry must be removed before troubleshooting.
** Clutch slippage may be recognized by alternate racing and loading of the engine, which is at times, accompanied by a violent chatter.
Table 3–13. Troubleshooting Chart (cont’d)
Problem Probable Causes Suggested Remedies
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