Hydraulic system – Lull 944E-42 Service Manual User Manual
Page 380
Hydraulic System
8.128
Model 644E-42/944E-42
Rev. 6/04
8.8.37
Auxiliary Hydraulic Circuit & Troubleshooting (Male Coupler Pressurized - Dual Joystick)
(644E-42, SN 0160003109 & After) (944E-42, SN 0160003107 & After)
(Refer to Section 8.8.61, “Auxiliary Hydraulic Circuit Description (Dual Joystick),” for a more detailed
explanation of this circuit.)
ATTACH
TILT
FRAME
EXT/RET
LFT/LWR
AU
X
TRANS
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
INLET
OUTLET
HYDRAULIC OIL
COOLER
FRONT
JOYSTICK
PILOT SELECT
VALVE
4
T
P
3
AUXILIARY
COUPLERS
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
MAIN
CONTROL
VALVE
MU6450
Relief Valve
Female
Coupler
Male
Coupler
Main Relief
Valve
Implement
Pump
Pressure
Tap
Pressure
Reducing
Cartridge
“PPG”
Pressure
Tap
Unloader
Cartridge
Pilot Supply
Line