Danfoss H1B 060 Service Manual

Check Cause Corrective action
5. Air in system Entrained air generates heat under pressure Look for foam or bubbles in reservoir. Check for leaks
on inlet side of charge pump.
6. Internal leakage Excessive internal leakage may overheat the
system.
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.
Excessive noise or vibration
Check Cause Corrective action
1. Oil level in reservoir Insufficient hydraulic fluid may cause cavitation. Fill reservoir to proper level.
2. Air in system Air bubbles may lead to cavitation. Look for foam or bubbles in reservoir. Check for leaks
on inlet side of charge pump.
3. Shaft coupling Loose shaft coupling may create excess noise. Replace loose shaft coupling. Replace or repair motor
if shaft splines show excessive wear.
4. Shaft alignment Misaligned shafts may create excessive noise and
vibration and can damage motor.
Correct shaft misalignment.
Motor operates normally in one direction only
Check Cause Corrective action
1. Charge pressure If charge pressure is low in one direction, the loop
flushing shuttle spool may be sticking to one side.
Measure charge pressure in forward and reverse. If
pressure drops significantly lower in one direction,
inspect and repair loop flushing shuttle spool.
2. Pressure compensator control If pressure compensator operates in one direction
only, the motor may stay at minimum
displacement in the opposite direction.
Check brake pressure defeat spool. It may be sticking
or receiving an improper signal. Repair spool or
correct input signal.
Improper output speed
Check Cause Corrective action
1. Oil level in reservoir Insufficient hydraulic fluid may reduce system
efficiency.
Fill reservoir to proper level.
2. Threshold setting Improper threshold setting may cause motor to
have wrong displacement for given signal.
Check threshold setting. Refer to Control Service
Manual for adjustment procedure.
3. Pressure compensator setting Improper pressure compensator setting may shift
motor displacement at wrong pressure.
Check pressure compensator setting. Adjust if
necessary. Refer to Control Service Manual for
adjustment procedure.
4. PC spool Pressure compensator spool sticking may shift
motor to improper displacement.
Check pressure compensator spool. Repair or replace
if needed. Refer to Control Service Manual for
adjustment procedure.
5. Control orifices Blocked or restricted orifice may cause motor to
shift improperly.
Remove, inspect and clean all orifices.
6. Control spool Sticky proportional control spool may cause motor
to shift improperly.
Check control spool for proper operation. Repair if
necessary. Refer to control adjustment procedure.
7. Control input signal Improper input signal may cause motor to shift
improperly.
Correct control input signal.
8. Internal leakage Excess internal leakage may cause lower charge
pressure and affect motor performance including
output speed.
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.
Service Manual
H1 Bent Axis Motors, Size 060/080/110/160/210/250 cm3
Troubleshooting
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Danfoss | August 2018 AX00000025en-US0504 | 31

Danfoss H1B 060 Specifications

General

Brand	Danfoss
Model	H1B 060
Category	Engine
Language	English