Motor Operates Normally In One Direction Only; Improper Output Speed; H1F Low Output Torque - Danfoss H1F 080 Service Manual

Service Manual
H1F Bent Axis Fixed Displacement Motors, Size 080
Troubleshooting

Motor operates normally in one direction only

Check
1. Charge pressure

Improper output speed

Check
1. Oil level in reservoir
8. Internal leakage

H1F Low output Torque

Check
8. Internal leakage
24 | © Danfoss | December 2023
Cause
If charge pressure is low in one direction, the loop
flushing shuttle spool may be sticking to one side.
Cause
Insufficient hydraulic fluid may reduce system
efficiency.
Excess internal leakage may cause lower charge
pressure and affect motor performance including
output speed.
Cause
Excess internal leakage may cause charge pressure
to decay, reducing output torque.
Corrective action
Measure charge pressure in forward and reverse. If
pressure drops significantly lower in one direction,
inspect and repair loop flushing shuttle spool.
Corrective action
Fill reservoir to proper level.
Install loop flushing defeat option and measure case
flow. If case flow is excessive, motor may require major
repair. Contact your Danfoss authorized service
center.
Corrective action
Install loop flushing defeat option and monitor case
flow. If case flow is excessive, motor may require major
repair. Contact your Danfoss authorized service
center.
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