Boom Retract Circuit And Troubleshooting - JLG sky trak mmv Service Manual

Hydraulic System
9.8.5

Boom Retract Circuit and Troubleshooting

(Refer to Section 9.8.25, Boom Extend/Retract Circuit Description for a more detailed explanation of this circuit.)
OPERATOR'S
CAB
JOYSTICK
1 2
P
T
4 3
Pressure
Return
Pilot Pressure
Suction
Load Sense
9.24
R
EXTEND/
RETRACT
CYLINDER
E
UNLOADER
VALVE
PILOT SELECT
MANIFOLD
VALVE PLATE ASSEMBLY
HYDRAULIC RESERVOIR
HYDRAULIC
OIL COOLER
PILOT PRESSURE
REDUCING VALVE
T
P
SECONDARY
FUNCTION
MANIFOLD
PBG
PP PPG PB
DIFF
PRESS
RELIEF
SENSE
VALVE
VALVE
MAIN
CONTROL
VALVE
PUMP
CF PIL EF ACF ACR LS
ACCUMULATOR
CHARGE VALVE
LSG
P P1 SW DRAIN
MM3271
Model MMV Rev. 12/04