Copyright © 1998 General Motors Corp. H–31
WTEC II ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
APPENDIX H — HYDRAULIC SCHEMATICS
V01540.01
Air Protection
Valve
(OEM supplied)
MD/B 300/B 400 RETARDER HYDRAULIC SCHEMATIC
RETARDER OFF
EX
(Air)
Accumulator
EX
Retarder
Temp Sensor
Flow
Valve
Retarder
Control
Valve
CONTROL MAIN
MAIN PRESSURE
CONVERTER OUT
EXHAUST
ORIFICE LUBE
LUBE
FROM COOLER
TO COOLER
VEHICLE AIR
EX
Retarder
Charge
Pressure
Cooler
(H)
ON/OFF
Solenoid
(N)
Figure H–22. MD/B 300/B 400 Retarder Hydraulic Schematic, Retarder Off (From S/N 6510021203 to December 31,
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