Low Output Torque - Danfoss H1B 060 Service Manual

Service Manual
H1 Bent Axis Motors, Size 060/080/110/160/210/250 cm3
Troubleshooting

Low output torque

Check
1. Pressure compensator setting
2. Control orifices
3. Pressure compensator spool
4. Control spool
5. Two position solenoid
6. Control input signal
7. Threshold setting
(proportional control)
8. Internal leakage
32 | © Danfoss | August 2018
Cause
High pressure compensator setting may cause
improper motor displacement for torque required.
Blocked or restricted orifice may cause motor to
shift improperly.
Sticking pressure compensator spool may cause
control to hold motor at minimum displacement.
Sticking control spool may cause motor to shift
improperly.
Two position control not shifting motor to
maximum displacement.
Improper control input signal may cause motor to
stay at minimum displacement.
Improper threshold setting may cause improper
motor displacement for torque required.
Excess internal leakage may cause charge pressure
to decay, reducing output torque.
Corrective action
Check and adjust pressure compensator setting.
Remove, inspect and clean all orifices.
Remove and inspect pressure compensating spool.
Repair or replace control if necessary.
Remove and inspect control spool. Repair or replace
control if necessary.
Inspect solenoid valve for bent stem or damaged coil.
Repair or replace if necessary.
Correct control input signal.
Check and adjust threshold setting.
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.
AX00000025en-US0504