Service guide | Disassembling and Assembling, APP 11-13 and APP 16-22
© Danfoss | DCS (im) | 2017.06
180R9228 | 521B1181 | DKCFN.PI.013.V3.02 | 17
9. When should the pistons
be replaced?
This section provides guides on how to deter-
mine whether the pistons of APP 11-13 and 16-22
are worn and should be replaced.
Note: If the pistons break down, the pump
will suffer a disastrous breakdown.
In case of doubt - the pistons must be replaced.
If any worn pistons are found, all pistons must be
replaced.
The pictures below are meant as guideline for
evaluating the wear of the sliding surface.W
1. INo wear or cavitation of the piston shoe.
New inspection is required within 4,000
hours.
2. Cavitation of the piston shoes.
New inspection is required within 2,000
hours.
3.. Cavitation of the piston shoes.
All pistons must be replaced within the
next 1,000 hours.