Insane Hydraulics

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Danfoss Series 90 FIxed Displacement Desintegration

This is another fixed displacement hydraulic motor from Sauer Danfoss that won't be displacing much in the nearest future... If you analyze the valve plate, you'll see that it shows no signs of large particle scoring - only normal wear - which means that despite the fact that the rotary group was completely destroyed, it is probable that no significant contamination of the "high pressure department" occurred, which means that there's a good chance of finding the pump in a reasonably good condition.

I always advise our clients to dismount and evaluate the condition of both pump and motor whenever a closed loop transmission fails. In this case the pump was dismounted and nothing but normal wear was discovered. The overhaul of the pump resumed to re-sealing and minor lapping. The motor had to take in a couple of more parts, yes he did...