Lull 944E-42 Service Manual - Manual (Page 396)

Hydraulic System
8.144 Model 644E-42/944E-42 Rev. 6/04
8.8.45 Auxiliary Hydraulic Pressure Release Circuit & Troubleshooting (Single Joystick)
(644E-42, SN 20118 & Before, SN 0160002519 thru 0160003108)
(944E-42, SN 20123 & Before, SN 0160002514 thru 0160003106)
(Refer to Section 8.8.63, “Auxiliary Hydraulic Pressure Release Valve (644E-42, SN 20118 & Before,
SN 0160002519 thru 0160003108) (944E-42, SN 20123 & Before, SN 0160002514 thru 0160003106),” for a
more detailed explanation of this circuit.)
MAIN CONTROL
VALVE
INLET
OUTLET
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
RETURN
FILTER
25 PSI
(1,7 BAR)
BYPASS
CHECK
VALVE
SINGLE
JOYSTICK
HYDRAULIC OIL
COOLER
CHECK VALVE
85 PSI (5,9 bar)
HYDRAULIC
RESERVOIR
Suction
Return
Load Sense
Pressure
Pilot Pressure
PUMP
SHUTTLE
VALVE
AUXILIARY
COUPLERS
1
3
T
P
4
2
P4 P3
P
P2
T
EB
EA
HB
HA
CTB
CTA
SINGLE
JOYSTICK
PILOT
SELECT
VALVE
P1 TB
TA
AUX2
AUX1
AUXILIARY
HYDRAULIC
PRESSURE
RELEASE
VALVE
AUXILIARY
HYDRAULIC
PRESSURE
RELEASE
SWITCH
MU6281
Relief Valve
Male
Coupler
Main
Relief
Valve
Implement
Pump
Pressure
Tap
Pressure
Reducing
Cartridge
“PPG”
Pressure
Tap
Female
Coupler