Service Manual User guide

Hydraulic System
8.72
Model 644E-42/944E-42 Rev. 6/04
8.8.9 Emergency Towing Park Brake Release Circuit & Troubleshooting
(Refer to Section 8.8.50, “Brake Circuit Description,” for a more detailed explanation of this circuit.)
Suction
Return
Load Sense
Pressure
Pilot Pressure
FRONT AXLE
HYDRAULIC
RESERVOIR
PUMP
ACCUMULATOR
CHARGE/SECONDARY
FUNCTION VALVE
LS
DRAIN P1
LSG
ACR
SW P
ACFEFCF PIL
PB
PBG
PPG
SW
MU0540
Connect Port-a-Power to
this port (“PBG”) to
release front axle park
brake for emergency
towing.