Allison B 400 - Page 340

WTEC II ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
APPENDIX H — HYDRAULIC SCHEMATICS
H–32 Copyright © 1998 General Motors Corp.
Retarder
Charge
Pressure
HD/B 500 RETARDER HYDRAULIC SCHEMATIC
RETARDER ON
CONTROL MAIN
MAIN PRESSURE
RETARDER OUT
CONVERTER OUT
EXHAUST
TO RETARDER
LUBE
FROM COOLER
TO COOLER
VEHICLE AIR
V01131.01
Air Protection
Valve
(OEM supplied)
Accumulator
ON/OFF
Solenoid
(N)
EX
(Air)
EX
Retarder
Temp Sensor
Flow
Valve
(H)
Retarder
Control
Valve
Exhaust
Check Valve
EX
EX
Cooler
1997)