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Service Manual
H1F Bent Axis Fixed Displacement Motors, Size 080
Troubleshooting
Overview
H1F Sluggish operation
Check
1.
Internal leakage
System operating hot
Check
1.
Oil level
2.
Heat exchanger
3.
Loop flushing flow
4.
Loop flushing shuttle
5.
Air in system
6.
Internal leakage
Excessive noise or vibration
Check
1.
Oil level in reservoir
2.
Air in system
3.
Shaft coupling
4.
Shaft alignment
©
Danfoss | December 2023
This section provides general steps to follow if you observe undesirable system conditions. Follow the
steps until you solve the problem. Some of the items are system specific. Always observe the safety
precautions in the
Introduction
W
Warning
Unintended movement of the machine or mechanism may cause injury to the technician or bystanders.
To protect against unintended movement, secure the machine or disable/disconnect the mechanism
while servicing.
Cause
Excessive leakage will cause lower charge pressure
and affect performance.
Cause
Insufficient hydraulic fluid may cause overheating.
Blocked heat exchanger or low air flow may cause
system overheating.
Restricted orifice in loop flushing cartridge reduces
flow.
Loop flushing shuttle may be sticking in one
direction.
Entrained air generates heat under pressure
Excessive internal leakage may overheat the
system.
Cause
Insufficient hydraulic fluid may cause cavitation.
Air bubbles may lead to cavitation.
Loose shaft coupling may create excess noise.
Misaligned shafts may create excessive noise and
vibration and can damage motor.
section.
Corrective action
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
Fill reservoir to proper level.
Check temperature upstream and downstream of heat
exchanger. Clean, repair, or replace heat exchanger if
necessary.
Measure case drain flow. Clean or replace orifice
cartridge.
Ensure shuttle moves freely in its bore.
Look for foam or bubbles in reservoir. Check for leaks
on inlet side of charge pump.
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.
Corrective action
Fill reservoir to proper level.
Look for foam or bubbles in reservoir. Check for leaks
on inlet side of charge pump.
Replace loose shaft coupling. Replace or repair motor
if shaft splines show excessive wear.
Correct shaft misalignment.
AX465363259664en-000102 | 23
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