Item
Description
Action
Low prime mover speed
Low engine speed reduces system performance.
Adjust engine speed.
Charge pressure
Incorrect pressure affects system performance.
Measure and adjust charge pressure relief or replace charge
pump.
Air in system
Air in system produces sluggish system response.
Fill tank to proper level. Cycle system slowly for several
minutes to remove air from system.
Contaminated control
orifices
Control orifices are plugged.
Clean control orifices.
Contaminated control
screens
EDC supply screen is plugged.
Replace control screens. Only a Danfoss Authorized Service
Center may remove the unit’s endcap without voiding the
warranty.
Pump inlet vacuum
Inlet vacuum is too high resulting in reduced system
pressure.
Measure charge inlet vacuum. Inspect line for proper sizing.
Replace filter. Confirm proper bypass operation.
Service Manual
H1P 069—H1P 250 Axial Piston Single Pumps
Troubleshooting
©
Danfoss | September 2020
AX152886482551en-000504 | 33
