Lull 944E-42 Service Manual - Manual (Page 314)

Hydraulic System
8.62 Model 644E-42/944E-42 Rev. 6/04
8.8.4 Joystick Circuit & Troubleshooting (Front - Dual Joystick)
(Refer to Section 8.8.48, “Joystick Circuit Description (Dual Joystick),” for a more detailed explanation of
this circuit.)
Suction
Return
Load Sense
Pressure
Pilot Pressure
PUMP
HYDRAULIC
RESERVOIR
ATTACH
TILT
FRAME
EXT/RET LFT/LWR
AU
X
TRANS
ACCUMULATOR
CHARGE/SECONDARY
FUNCTION VALVE
LS
DRAIN P1
LSG ACR
SW P
ACF EF CF PIL PB
PBG
PPG
SW
MAIN CONTROL
VALVE
INLET
OUTLET
HYDRAULIC OIL
COOLER
FRONT
JOYSTICK
PILOT SELECT
VALVE
4
T
P 3
2 1
CHECK VALVE
85 PSI (5,9 bar)
RETURN
FILTER
25 PSI
(1,7 BAR)
BYPASS
CHECK
VALVE
P1
P2
B1
B3
A1
A3
MU0701
Pressure
Reducing
Cartridge
“PPG”
Pressure
Tap
“P1”
Pressure
Tap
MU0701