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Danfoss LDU21C Service Manual page 21

Closed circuit axial piston transmission

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Service Manual
LDU21C Closed Circuit Axial Piston Transmission
Troubleshooting
Item
Description
Shaft alignment
Misaligned HST and prime mover shafts create noise.
Charge check/HPRVs
Unusual noise may indicate sticking valves. Possible
contamination.
Sluggish System Response
Item
Description
Oil level in reservoir
Low oil level causes sluggish response.
Charge check/HPRVs
Incorrect pressure settings affects system reaction time.
Low prime mover speed
Low engine speed reduces system performance
Air in system
Air in system produces sluggish system response
Charge inlet vacuum
Inlet vacuum is too high resulting in reduced system
pressure.
Control linkage
Linkage operating improperly
©
Danfoss | April 2025
Action
Align shafts.
Clean/replace valves and test the unit.
Action
Fill reservoir.
Replace charge check/HPRVs
Adjust engine speed.
Fill tank to proper level. Cycle system slowly for several
minutes to remove air from system.
Measure charge inlet vacuum. Inspect line for proper sizing.
Replace filter. Confirm proper bypass operation.
Repair or replace control linkage
AX342138485422en-000102 | 21

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