JLG 340AJ, Service And Maintenance Manual

Page: 367 / 370

SECTION 7 - BASIC ELECTRICAL INFORMATION & SCHEMATICS
3121259 – JLG Lift – 7-31
B A
Function Pump
LOWER LIFT CYLINDER
BARREL: 2.95"(75mm)
ROD: 1.77"(45mm)
STROKE: 29.6" (751.8mm)
RETURN FILTER
MICRON LEVEL: 6
BYPASS VALVE: 45 PSI
FUNCTION PUMP
1st Gear: 0.51 cu in (8.4cc) at 1800 RPM, 3.6 GPM
2nd Gear: 0.16 cu in (2.62cc) at 1800 RPM, 1.1 GPM
+12VDC at Coil C1 = pressure at M4 = flow out port A
+12VDC at Coil C2 = pressure at M5 = flow out port B
DRIVE MOTOR
Fixed 12.2 cu in (200CC)
Presurize port A = CW Rotation
Presurize port B = CCW Rotation
DRIVE GEAR BOX
Ratio: 4.25:1
Brake Torque 4300 in/lb
Brake Release 350 PSI (24 BAR)
Output Rotation Opposite Input Rotation
SWING DRIVE
MOTOR D: 2.2 cu in (36cc)
REDUCTION: 170.7:1
CHARGE FILTER
MICRON LEVEL: 5
BYPASS VALVE: 43 PSI (3 BAR)
DRIVE PUMP
2.75 cu in (45 cc)
4060 PSI (280 BAR) Max
377 PSI (26 BAR) Charge
0.73 cu in (12cc) Charge Pump Displacement
P1 Main relief 2500 PSI (172.4 BAR)
P2 Main relief 3000 PSI (207 BAR)
Swing port relief 1000 PSI (69 BAR)
Steer port relief 2500 PSI (172.4 BAR)
Platform level up port relief 2800 PSI (193 BAR)
Platform level down port relief 1400 PSI (96.5 BAR)
Forward
Reverse
MAIN CONTROL VALVE
STEER FLOW CONTROL UPPER LIFT SWING LOWER LIFT
P4 M4 3 4 5 6
MS
T CP P1 P2 M1 M2
1
2
DRIVE VALVE
Secondary oscl axle valve
Primary oscl axle valve
1 4 5 8
12 13 15 16 18 17
14
V1
V2
ORF
X
Hydraulic Oil Analysis Sampling Valve
HYDRAULIC RELIEF VALVE SETTINGS:
1 2
MA
L2 MB
C2 C1
M4
M5
A
M3
B
S
E
F
L1
X
M14
DRIVE
PUMP
X3
Emergency Descent
Hand Pump
Figure 7-37. Hydraulic Schematic - Sheet 2 of 2
1001120020-C