WTEC II ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
APPENDIX H — HYDRAULIC SCHEMATICS
H–30 Copyright © 1998 General Motors Corp.
MD/B 300/B 400 RETARDER HYDRAULIC SCHEMATIC
RETARDER ON
CONTROL MAIN
MAIN PRESSURE
RETARDER OUT
CONVERTER OUT
EXHAUST
TO RETARDER
LUBE
FROM COOLER
TO COOLER
VEHICLE AIR
V01539.01
Air Protection
Valve
(OEM supplied)
Accumulator
ON/OFF
Solenoid
(N)
EX
(Air)
EX
Retarder
Temp Sensor
Flow
Valve
EX
Retarder
Charge
Pressure
Cooler
(H)
Retarder
Control
Valve
Figure H–21. MD/B 300/B 400 Retarder Hydraulic Schematic, Retarder On (From S/N 6510021203 to December 31, 1997)
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