GMC 1976 ZEO 6083 Maintenance Manual page 465

FIRM SHIFT : QUICK HARSH AND
GENERALLY AGGRESSIVE
NORMAL
REMOVE CONTROL
VALVE ASSEMBLY
FRONT ACCUM. PISTC N
ST
UCK-ACCUM. SPRING
BROKEN OR MISSING
WITH BRAKES APPLIED,
CHECK LINE PRESSURE
IN DRIVE AT 1000 RPM
LIGHT ON
NO 2-3 AT HEAVY THROTTLE
-CONTROL VALVE ASSY.-
CHECK DETENT VALVE TRAIN-
HIGH
-DETENT SOLENOID-
DEFECTIVE CONNECTIONS, INOPERATIVE
SHORTED WIRE, OPEN WIRE, VALVE STUCK,
ORIFICE PLUGGED
CHECK CAUSE OF
HIGH PRESSURE
CHECK CONTROL
VALVE ASSY . DRILLED
HOLE TO ACCUM.
AIR CHECK DIRECT CLUTCH FOR LEAK TO OUTER
AREA OF CLUTCH PISTON . LEAK COULD BE AT
CENTER PISTON SEAL-2ND RING ON CENTER
SUPPORT OR DAMAGED SUPPORT
2-3 SHIFT COMPLAINT
CHECK ENGINE
PERFORMANCE
I ST & 2ND SPEEDS ONLY, NO 2-3
PLUG USED ON FIXED
STATOR TRANS.
NORMAL
T
REMOVE CONTROL VALVE
ASSEMBLY CAREFULLY
CHECK CONTROL
VALVE ASSY . FOR
DAMAGED OR
LEAKY PASSAGES
STUCK VALVES
CHECK SPACER PLATE
FOR DAMAGE, BLOCKED
DIR. CLUTCH FEED
ORIFICE OR MISPO.
SITIONED GASKET .
RESTRICTED
EXHAUST
SYSTEM
VEHICLEON LIFT, IGNITION ON
(ENGINE NOT OPERATING)
DISCONNECT ELECT . PLUG FROM TRANS.-
CONNECT TEST LIGHT TO "DETENT" TERMINAL
OF DISCONNECTED WIRE HARNESS-
SEE ILLUSTRATION BELOW
DEPRESS ACCELERATOR FULLY
DETENT
2-3 Shift, 1st & 2nd Speeds, No Detent
SOFT SHIFT : SLIPS, OR EXTENDED
TIME DURING SHIFT WITH END BU
WITH BRAKES APPLIED,
CHECK LINE PRESSURE
IN DRIVE AT 1000 RPM
CHECK FOR BROKEN OR
MISSING FRONT SERVO
SPRING OR LEAK AT
SERVO PIN
AIR CHECK
DIR. C L. FOR
EXCESSIVE LEAK
IF LEAK IS
EXCESSIVE
IF LEAK IS
NOT EXCESSIVE
-CONTROL VALVE ASSY.-
STUCK 2.3 VALVE,
GASKETS MISPOSITIONED OR
LEAKING
NO DETENT DOWNSHIFTS
TRANSMISSION
7- 17
P
LOW
T
CORRECT CAUSE OF
LOW PRESSURE
REMOVE TRANS.
INSPECT FOR
LEAK-CASE TO
CENTER SUP-
PORT . BROKEN,
UNDERSIZE
OIL RINGS.
DAMAGED,
MISSING PISTON
SEALS.
REMOVE TRANS.
INSPECT DIR. CL . FOR
PROPER NO. 6 TYPE OF
CLUTCH PLATES
-DIRECT CLUTCH BURNED-
CHECK CAUSE
-IMPROPER VACUUM-
CHECK CAUSE
LIGHT OFF
-DETENT SWITCH-
1 . MALADJUSTED-REFER TO CAR
MFG. SERVICE MANUALS FOR
ADJUSTMENT PROCEDURES
2. DEFECTIVE SWITCH, CONNECTIONS,
FUSE, SHORTED WIRE'
' SHORTED SOLENOID WIRE CAN CAUSE
FUSE TO BLOW .