Danfoss APP series

180R9346 | AQ240486503020en-001702 | 87© Danfoss | 2023.03
Operation guide Installation, Operation and Maintenance APP 53-92 pumps
3. Appendix 1 Pistons:
The pistons are the heart of the pump regarding
service.
If the pistons break down, the pump will suer a
breakdown.
In case of doubt - the pistons must be replaced.
The pictures below is ment as a guideline for
evaluating the wear of the sliding surface.
Cavitation of the piston shoes.
New inspection is required in 3,000-4,000 hours.
Cavitation of the piston shoes.
All pistons must be replaced within the next
500-1,000 hours.
Cavitation of the piston shoes.
All pistons must be replaced within the next
100-200 hours.
Cavitation of the piston shoes.
All pistons must be replaced immediately.
Abrasive wear of the piston shoes.
All pistons must be replaced immediately.