Danfoss APP 1.5-2.5 Bedienungsanleitung

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

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