Adjusting Main Relief Valve Pressure Settings - Manitowoc Grove 5540F Service Manual

HYDRAULIC SYSTEM
p1636
Winch Hoist/Boom Lift Circuit Main Relief Valve Test Connection
Steering Circuit Relief Valve Test
1. With the engine shut off and the parking brake engaged,
connect a 0 - 5000 psi (0 - 345 bar) to the test
connection on the pressure side of the steering section
of the hydraulic pump (Figure 4-17).
2. Start the engine and accelerate it to full rpm.
3. Place the steering select switch in 2 wheel steering
mode.
4. Turn the steering wheel in either direction until the front
wheels are at their maximum steerable position. Hold
the steering wheel in position and observe the pressure
gauge attached to the pump outlet. The relief valve
should open at 2500 ± 50 psi (172 ± 3.5 bar). Release
the steering wheel after the reading is obtained.
4-16
5. If the pressure reading is correct, stop the engine and
remove the pressure gauge.
6. If the pressure reading is incorrect, the priority flow
control valve must be replaced. The relief valve portion
of the valve is nonadjustable.
p1637
FIGURE 4-16
Steering Circuit Main Relief Valve Test Connection
Adjusting Main Relief Valve Pressure
Settings
NOTE:
Published 10-21-2010, Control# 198-04
5540F/YB5515 SERVICE MANUAL
It is necessary to climb under the crane to perform
pressure setting testing. Be sure engine is shut off
and the ignition key is removed (unless noted),
parking brake is engaged and chock blocks are in
place before climbing under the crane.
FIGURE 4-17