Changing Pistons - Danfoss APP 21 Service Manual

Service guide | Disassembling and Assembling, APP 21 - 46 and APP W HC 15 -30
7.

Changing pistons

12 | 180R9406 | AX274339308034en-000302
Tools needed are:
• 13 mm combination wrench
• 6 mm allen key:
•
• Service kit - see parts list 521B0941
7.1 Disassembling
1. Disconnect the pump from the rest of the
system.
Warning:
Never unscrew the 4 screws marked
with coloured sealer.
3. Mount the guide bolt in the top hole.
2. Loosen all screws on the pump except
the three screws as shown above.
Note:
There is still water inside the pump.
4. Unscrew the remaining three screws
by using the combination wrench to turn
each screw a couple of rounds at a time so
the flange is removed as straight forward
as possible..
© Danfoss | 2023.03