Nilfisk-Advance 56507009, Troubleshooting Manual

Page: 61 / 82

FORM NO. 56043129 - SR 1900 - 61
HYDRAULIC SYSTEM
PRESSURE RELIEF VALVE
Instructions for testing and adjusting the main pressure relief valve that is built into the machines hydraulic manifold assembly:
Insert hydraulic test gauge (3000 psi.) to the XT1 test port (location between pump & solenoid manifold).
To check pressure the hydraulic oil must be warm & engine at high speed (2400 RPM).
Activate the hopper lift (raise or lower) to dead head its cylinder to place the pump circuit into an overloaded condition.
CAUTION!
Do not test in the overloaded condition for a long period as this may cause damage (excessive heat build up).
Observe the pressure gauge reading in the overloaded (dead headed) position and adjust accordingly. The hydraulic systems relief
setting is 2500 PSI. for all models. See Figure 3. Loosen lock-nut turn adjustment screw CCW to decrease & CW to increase.