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022-00029AE Operation and Maintenance Manual
Inspection, Maintenance and Adjustment 4-53
CHECK HYDRAULIC PRESSURES
Hydraulic pressures 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 94)
2.
Relief cartridge for main pump must open
at 200
+5
kg/cm
2
(2,918
+70
psi).
3.
Adjust screw on relief valve cartridge (1,
Figure 95). Loosen lock nut and turn screw
clockwise to raise relief pressure. Turn
screw counterclockwise to lower relief
pressure.
Tighten lock nut after pressure has been
adjusted.
Port Number
Description
1
Main Pump Pressure
2
Transmission System
Pressure
3
Brake Charge Pressure
4
Pilot Control Valve Lever
(Joystick) Activation
Pressure
HAOP341S
Figure 93
Figure 94
Figure 95