Danfoss 51 Series

64 pages

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Service Manual

Bent Axis Motors

Series 51 and 51-1

powersolutions.danfoss.com

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Other manuals for Danfoss 51 Series

Repair Instructions36 pages

Service Kit Instructions2 pages

Questions and Answers:

M
Michael HallAug 16, 2025
Why is there excessive noise or vibration in my Danfoss 51 Series Engine?
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  Deborah SellersAug 16, 2025
  Excessive noise or vibration in your Danfoss Engine can stem from several causes. Insufficient hydraulic fluid can lead to cavitation, so ensure the reservoir is filled to the proper level. Air bubbles can also cause cavitation; look for foam or bubbles in the reservoir and check for leaks on the inlet side of the charge pump. Loose shaft couplings or misaligned shafts can also create noise and damage; replace loose couplings and correct any shaft misalignment. If shaft splines are worn excessively, replace or repair the motor.
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Roger JohnsonAug 21, 2025
What to do if Danfoss 51 Series motor operates normally in one direction only?
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  Emma SmithAug 22, 2025
  If your Danfoss Engine motor operates normally in only one direction, it could be due to a few reasons. If charge pressure is low in one direction, the loop flushing shuttle spool may be sticking; measure charge pressure in both directions and inspect/repair the spool if needed. If the control shifts the motor to minimum displacement in one direction, it may lack sufficient torque; measure servo pressures to check control operation and repair the control or correct the input signal. If the pressure compensator operates in one direction only, the motor will stay at minimum displacement in the other direction; check the brake pressure defeat spool for sticking or improper signals and repair the spool or correct the input signal.