Allison B 300 - WT Hydraulic Schematic - 2 Nd Range

Copyright © 1998 General Motors Corp. H–5
WTEC II ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
APPENDIX H — HYDRAULIC SCHEMATICS
V01124.04
EX
Torque
Converter
CONVERTER IN
CONVERTER OUT
Overdrive
Knockdown
Conv
Flow
C2
Latch
C1 C4
Exhaust
Backfill
C1
Latch
Cooler
Lube
Filter
Lube
Regulator
Main
Regulator
Ctl.
Main
Reg.
EX
EX
WT HYDRAULIC SCHEMATIC — 2nd RANGE
C4 C5
C3
C2
C1
N/O
C3
N/C
C5
N/C
AC
E
EX
Conv
Regulator
C1
Lockup
Lube
Lube
C3 Pressure
Switch
C5
C3C2
Accumulator/
Relay Valve
Main
Filter
Pressure Relief
Pump
Sump
Suction
Filter
Main
MAIN
CONTROL MAIN
EXHAUST
SUCTION
COOLER/LUBE
EX. BACKFILL
CONVERTER
FWD. KDN.
*SOLENOIDS ENERGIZED
CLUTCH APPLIED C1, C4 LOCKUP
LOCKUP
C1
C4
BDFG
NOTE: During 1-2 Upshift and 2-1 Downshift, Solenoid G is
de-energized (C2 Latch Valve “Up”, C1 Latch Valve “Down”)
to exhaust C5 Clutch through Solenoid E Regulator Valve.
*
Main
(MD, B 300, and
B 400 models only)
BDFG
EFFECTIVE S/N:
MD/B 300/B 400
S/N 6510024410
HD/B 500
ALL S/N
LU
N/C
C4
N/C
FBD
C2
N/O
C4
N/C
FWD
N/C
ON—OFF
FBD
EX
G
Figure H–5. WT Hydraulic Schematic — 2nd Range