GMC 1976 ZEO 6083 Maintenance Manual page 462

3
N
0
m
c
0
m
d
m
a
0
O
m y
N
c 1
TRANSMISSION MALFUNCTION RELATED TO OIL PRESSURE
(PRESSURES OBTAINED BY THE PRELIMINARY CHECKING PROCEDURE)
* DRIVE RANGE, VACUUM LINE DISCONNECTED TO MODULATOR
DRIVE
REVERSE SUPER OR LO NEUTRAL
DRIVE
PRESSURE DROP
BRAKES
BRAKES BRAKES
BRAKES 30 MPH
DRIVE OCCURS WHILE
APPLIED APPLIED
APPLIED APPLIED
CLOSED IDLE
ENGINE RPM POSSIBLE CAUSE
MALFUNCTION
1000 RPM 1000 RP
1000 RPM 1000 RPM THROTTLE
INCREASES FROM OF MALFUNCTION
1000 TO 3000 RPM
OIL
OIL
OIL OIL
OIL OIL
WHEELS FREE
PRESSURE
PRESSURE
PRESSURE PRESSURE
PRESSURE PRESSURE
TO MOVE*
NORMAL
NORMAL
NORMAL
NORMAL NORMAL NORMAL
DROP
MALFUNCTION IN
CONTROL VALVE ASSY .
MALFUNCTION IN
NORMAL
NORMAL NORMAL
NORMAL NORMAL NORMAL
NO DROP
GOVERNOR OR
NO 1-2 UPSHIFT
_ GOVERNOR FEED
AND/OR DELAYED
SYSTEM
UPSHIFT
HIGH NORMAL
NORMAL NORMAL HIGH -
-
MALFUNCTION IN
DETENT SYSTEM
MALFUNCTION IN
HIGH HIGH NORMAL
HIGH
- -
-
MODULATOR OR
VACUUM FEED SYSTEM
TO MODULATOR
OIL LEAK IN FEED
SLIPPING-REVERSE
NORMAL LOW NORMAL NORMAL NORMAL -
-
SYSTEM TO THE
DIRECT CLUTCH
LOW TO
LOW TO OIL LEAK IN FEED
SLIPPING-1ST GEAR
LOW NORMAL
NORMAL NORMAL NORMAL -
- SYSTEM TO THE
FORWARD CLUTCH