022-00028AE Operation and Maintenance Manual
Inspection, Maintenance and Adjustment 4-53
CHECK HYDRAULIC PRESSURES
Hydraulic pressure for most systems can be
check by using the remote test ports shown in
(Figure 93).
MAIN PUMP PRESSURE
1.
Attach gauge to port (1, Figure 93).
2.
Relief cartridge for main pump must open
at 205
±
5
kg/cm
2
(2,915
±
70
psi).
3.
Adjust screw on relief valve cartridge
(Figure 94). Loosen lock nut and turn
screw clockwise to raise relief pressure.
Turn screw counterclockwise to lower relief
pressure.
4.
Tighten lock nut after pressure has been
adjusted.
CONTROL LEVER ACTIVATION PRESSURE
(S/N 1001 thru 2000)
1.
Attach gauge to port (2, Figure 93).
2.
Adjust relief cartridge (3, Figure 95) on
brake and pilot supply valve (1, Figure 95).
Relief pressure should be set at 28 kg/
cm
2
(398
psi).
3.
Loosen lock nut on adjusting screw. Turn
adjusting screw clockwise to raise relief
pressure. Turn adjusting screw
counterclockwise to lower relief pressure.
4.
Tighten lock nut after adjustment has been
made.
Reference
Number
Description
1
Main Pump Pressure
2
Control Lever Activation
Pressure
3
Steering Pump Pressure
4
Transmission Clutch Pressure
5
Brake Charge Pressure
Figure 93
P - From pump
3A - Boom lower
2A - Bucket dump
R - To Tank
3B - Boom raise
2A - Bucket crowd
APO0120L
Figure 94
APO0130L
1
2
3
Figure 95
+3
-2
+43
-30
