When Should The Pistons Be Replaced - Danfoss APP 21 Service Manual

Service guide | Disassembling and Assembling, APP 21 - 46 and APP W HC 15 - 30
8. When should the
pistons be replaced
© Danfoss | 2023.03
This section provides guidance on, how to deter-
mine whether the parts of APP 21-43 are worn
and should be replaced. In case of doubt - the
pistons must be replaced. The pictures below are
ment as a guideline for evaluating the wear of
the sliding surface.
1. No wear or cavitation of the piston shoe.
New inspection is required in 4,000 hours.
3. Cavitation of the piston shoes.
All pistons must be replaced within the
next 1,000 hours.
Note:
If the pistons break down, the pump will
suffer a disastrous breakdown.
2. Cavitation of the piston shoes.
New inspection is required in 2,000 hours.
180R9406 | AX274339308034en-000302 | 17