Allison B 400 - MD;B 300;B 400 Retarder Hydraulic Schematic, Retarder on

WTEC II ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
APPENDIX H — HYDRAULIC SCHEMATICS
H–28 Copyright © 1998 General Motors Corp.
MD/B 300/B 400 RETARDER HYDRAULIC SCHEMATIC
RETARDER ON
(PRIOR TO S/N 6510021203)
CONTROL MAIN
MAIN PRESSURE
RETARDER OUT
CONVERTER OUT
EXHAUST
TO RETARDER
LUBE
FROM COOLER
TO COOLER
VEHICLE AIR
V01519
Air Protection
Valve
(OEM supplied)
Accumulator
ON/OFF
Solenoid
(H)
EX
(Air)
EX
Retarder
Temp Sensor
Flow
Valve
Signal
Valve
EX
Retarder
Charge
Pressure
Cooler
(K)
Retarder
Control
Valve
Figure H–19. MD/B 300/B 400 Retarder Hydraulic Schematic, Retarder On (Prior To S/N 6510021203)