Lull 944E-42 Service Manual - Manual (Page 318)

Hydraulic System
8.66 Model 644E-42/944E-42 Rev. 6/04
8.8.6 Joystick Circuit & Troubleshooting (Single Joystick)
(Refer to Section 8.8.49, “Joystick Circuit Description (Single Joystick),” for a more detailed explanation of
this circuit.)
Suction
Return
Load Sense
Pressure
Pilot Pressure
RETURN
FILTER
25 PSI
(1,7 BAR)
BYPASS
CHECK
VALVE
SINGLE
JOYSTICK
PILOT
SELECT
VALVE
P1 TB
TA
AUX2
AUX1
EB
EA
HB
HA
CTB
CTA
T P
P2 P3 P4
SINGLE
JOYSTICK
HYDRAULIC OIL
COOLER
CHECK VALVE
85 PSI (5,9 bar)
HYDRAULIC
RESERVOIR
1
3
T
P
4
2
MAIN CONTROL
VALVE
INLET
OUTLET
ATTACH
TILT
FRAME
EXT/RET LFT/LWR
AU
X
TRANS
PUMP
ACCUMULATOR
CHARGE/SECONDARY
FUNCTION VALVE
LS
DRAIN P1
LSG ACR
SW P
ACF EF CF PIL PB
PBG
PPG
SW
MU5380
Pressure
Reducing
Cartridge
“PPG”
Pressure
Tap
“P1”
Pressure
Tap