Danfoss APP W HC Series Operation Manual page 51

Instruction | Recommended service intervals for APP W HC 15 - 30 pumps
3. Appendix 1 Pistons:
The pistons are the heart of the pump regarding
service .
If the pistons break down, the pump will suffer a
breakdown .
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
100-200 hours .
Abrasive wear of the piston shoes .
All pistons must be replaced immediately .
180R9410 | AQ282628894589en-000801 | IOM APP W HC 15-30 Pumps | 01.2022
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 .
All pistons must be replaced within the next
500-1,000 hours .
Cavitation of the piston shoes .
All pistons must be replaced immediately .
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