Copyright © 1998 General Motors Corp. 8–15
GENERAL TROUBLESHOOTING OF PERFORMANCE COMPLAINTS
WTEC II ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
POWER TAKEOFF (PTO)*
(cont’d)
Loose flange
Inspect flange and bolts; replace
if necessary and properly torque
bolts
Loose bolts or damaged gaskets Replace gasket and/or properly
torque bolts
Loose or damaged hydraulic
lines (clutched drive)
Tighten fittings (replace if
necessary)
B.
Noisy PTO
Faulty driven component Replace faulty driven component
Gears or bearings worn,
damaged, or contaminated
Rebuild PTO with new gears or
bearings
C.
No or Intermittent Operation
(Clutched Drive)
Electrical problem (switch,
connectors, solenoid, or wires)
Inspect for electrical problem and
repair (see Appendix E)
Damaged or worn clutch Rebuild clutch assembly
Clutch piston seals damaged or
missing
Rebuild clutch assembly
Inadequate fluid pressure to PTO Inspect and repair fluid pressure
supply; line kinked, loose, or
plugged; orifice too small
Engine speed outside operating
band
Increase or reduce engine speed
to move within operating band
Drive or driven gear teeth
damaged
Replace damaged gears (refer to
transmission Service Manual)
TRANSFER CASE (T-CASE)
A.
Won’t Go Into First Range TPS adjustment Properly adjust TPS (refer to
Appendix F)
Engine speed too high Reduce Engine Speed
Wrong calibration Calibrate properly
Wrong control module (6 speed
instead of 7 speed)
Install correct control module
Faulty wiring, solenoid
connectors
Check wiring and connectors in
control module (refer to
transmission Service Manual)
Faulty C6 seals Replace C6 piston seals (refer to
transmission Service Manual)
Table 8–1. Troubleshooting Performance Complaints
(cont’d)
Problem
Probable Cause Suggested Remedy
* Contact your nearest Allison dealer/distributor with specific questions relating to PTO repair.
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