8–14 Copyright © 1998 General Motors Corp.
GENERAL TROUBLESHOOTING OF PERFORMANCE COMPLAINTS
WTEC II ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
LEAKING FLUID
(OUTPUT SHAFT)
(cont’d)
Machine lead on output flange
seal surface
Replace flange
Flange worn at seal surface Replace flange
Insufficient seal around seal OD When replacing seal, apply
sealant (refer to transmission
Service Manual)
Damaged, missing, or loose
output flange bolts
Replace and/or torque output
flange bolts
Damaged or missing flange
button O-ring
Replace flange button O-ring
Damaged or missing flange
button gasket
Replace flange button gasket
TRANSMISSION INPUT Front seal leaks Replace front seal (refer to
transmission Service Manual)
Converter leaks Check converter seals, cracked
converter pump tangs, converter
cover, or converter housing
porosity; replace parts as
required (refer to transmission
Service Manual)
PTO driveline out of
specification
Bring driveline into specification
DIRTY FLUID Failure to change fluid and filters Change fluid and install new
filters (refer to transmission
Mechanic’s Tips)
Excessive heat Refer to Overheating section
Damaged fluid filter/seals Replace oil filter/seals (refer to
transmission Mechanic’s Tips)
Substandard fluid Use recommended fluid (refer to
transmission Mechanic’s Tips)
Clutch/transmission failure Overhaul transmission (refer to
transmission Service Manual)
POWER TAKEOFF (PTO)*
A.
Leaks
Damaged or cocked seal Replace seal
PTO flange grooved at seal Replace PTO flange
* Contact your nearest Allison dealer/distributor with specific questions relating to PTO repair.
Table 8–1. Troubleshooting Performance Complaints
(cont’d)
Problem
Probable Cause Suggested Remedy
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