Danfoss APP 1.5-2.5 User manual

180R9091
521B0741 DKCFN.PI.013.EF4.02 08-2013
180R9091
INSTRUCTION
Internal pump elements
APP 1.5-2.5
To understand the pump design better, please see exploded view on last
page.
1. Unscrew the 4 mounting screws and remove the seal SAE
ange. Do not yet unscrew the 2 lower screws.
2. Wet the shaft and shaft seal with clean (ltered) soap-water.
Gently lever the shaft seal assembly free using 2 screwdrivers.
3. Unscrew the 2 lower screws.
This document covers the instructions for changing internal pump elements on the axial piston pumps APP 1.5-2.5
Note: It is essential that the pump is serviced in conditions of absolute cleanliness.
Tools needed:
. Toolset (code no. 180B4148)
. Shaft bush
. Press bush
. Allen key 5 mm
. 2 screwdrivers
4. Carefully turn the whole pump over so that the shaft is facing
down. Support the pump in a suitable hollow base so that the
pump is not supported by the shaft.
5. Remove the housing.

2 DKCFN.PI.013.EF4.02 521B0741
6. Remove the pistons, retaining plate, retaining ball, spring guide
and spring from the cylinder barrel.
7. Remove the cylinder barrel.
8. Remove the port plate.
9. Gently lever the valve plate assembly free with the aid of a
screw-driver.
10. Replace the O-rings and the back-up rings on the valve plate.
Mount the new back-up rings on the new valve plate rst and
then mount the new O-rings.
Mount backup ring rst
Then mount the O-ring

521B0741 DKCFN.PI.013.EF4.02 3
11. Wet the O-rings and back-up rings with clean (ltered) soap-
water.
12. Gently press, by hand, the valve onto the cylinder barrel.
13. Gently push ushing valve out using the Allen key.
14. Remove spring from poppet and poppet guide and remove
O-ring from poppet guide.
15. Press new spring onto shoulders of poppet guide and poppet
so it is stuck on both collars. Then mount new O-ring on poppet
guide.
16. Turn ushing valve upside down. If not properly assembled,
spring will fall o.
17. Mount ushing valve by pressing it into the hole.
18. Position the port plate over the guide pin.
IMPORTANT: Make sure that the guide pin is located in the
locating hole in the port plate. )
19. Replace the O-ring on the port ange and position the new
cylinder barrel on the port plate.
Guide pin
Locating hole
O-ring

4 DKCFN.PI.013.EF4.02 521B0741
20. Position the new spring, new spring guide, new retainer guide,
new retainer plate and new pistions.
21. Position the housing on the port ange and over the guide pin.
22. Hold the pump together and carefully turn it over to rest on the
housing. To prevent seizing-up, lubricate the threads on the 2
screws and screw them into the port ange and the housing.
Use Molykote D paste from Dow Corning or Klüber UH1 84-201
from Klüber lubrication. Tighten the 2 ange screws to a torque
of 12+1Nm.

521B0741 DKCFN.PI.013.EF4.02 5
23. Mount the new shaft seal following the instructions in changing
“Shaft seal - APP 1.5 - 2.5” (180R9089)
Wet the torpedo and new shaft seal with soap. Do not use
silicone grease.
Slide the shaft seal over the torpedo with the carbon seal face
pointing upwards. Be careful not to damage the carbon seal
face on the shaft seal.
24. Replace the O-ring on the SAE ange
25. Lubricate the threads on the 4 screws with grease and screw
them into the pump and tighten by hand. Use Molykote D
paste from Dow Corning or Klüber UH1 84-201 from Klüber
lubrication
Selection of spare parts
Please nd our APP part list 521B0941 on www.ro-solutions.com

6 DKCFN.PI.013.EF4.02 521B0741
Exploded view