Lull 944E-42 Service Manual - Manual (Page 310)

Hydraulic System
8.58 Model 644E-42/944E-42 Rev. 6/04
8.8.2 Pump & Cooling Circuit & Troubleshooting (Dual Joystick, SN 18461 and After)
(Refer to Section 8.8.46, “Pump and Cooling Circuit Description (Dual Joystick),” for a more detailed
explanation of this circuit.)
Suction
Return
Load Sense
Pressure
Pilot Pressure
PUMP
HYDRAULIC
RESERVOIR
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
REAR
JOYSTICK
1
3
T
P
4
2
FRAME SWAY
JOYSTICK
P
T
2 1
1
3
T
P
4
2
FRONT
JOYSTICK
BRIDGE DRAIN
ATTACH
TILT
FRAME
EXT/RET LFT/LWR
AU
X
TRANS
CHECK VALVE
85 PSI (5,9 bar)
RETURN
FILTER
25 PSI
(1,7 BAR)
BYPASS
CHECK
VALVE
MU5550