Danfoss APP 1.5 Manuale utente

Service guide

APP pumps

APP 1.5 - 3.5

Disassembling and assembling

hpp.danfoss.com

Service guide |Disassembling and Assembling, APP 1.5-3.5

Table of Contents

NOTE: If the pump is disassembled within the warranty period, the pump is no longer covered

by the warranty.

Introduction

This document covers the instructions for

disassembling and assembling the axial piston

pump APP 1.5-3.5

Tools needed:

• Shaft seal tool (code no. 180B4148)

• Press bush

• Allen key 5mm

• 2 Screwdrivers

Important: It is essential that the pump is

serviced in conditions of absolute cleanliness.

To understand the pump design better, please

see exploded view on last page.

WARNING: Do not reuse disassembled O-ring

or shaft seal as they might be damaged.

Contents

Introduction ................................................................................................................................................................................2

1. Disassembling and assembling the pump.............................................................................................................3

2. Change of shaft seal .......................................................................................................................................................7

3. Exploded views..............................................................................................................................................................10

3.1 APP 1.5-2.5 ......................................................................................................................................................................10

3.2 APP 3.0-3.5 ......................................................................................................................................................................11

Service guide | Disassembling and Assembling, APP 1.5-3.5

1. Disassembling and

assembling the pump

2. Wet the shaft and shaft seal with clean

(ﬁltered) soap water. Gently lever the shaft

seal assembly free using 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.

6. Remove the pistons, retaining plate,

retaining ball, spring guide, and spring

from the cylinder barrel.

1. Unscrew the 4 mounting screws and

remove seal SAE ﬂange.

Do not yet unscrew the 2 lower screws.

3. Unscrew the 2 lower screws.

5. Remove the housing.

APP 1.5-2.5

APP 3.0-3.5

Service guide |Disassembling and Assembling, APP 1.5-3.5

8. Remove the port plate.

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 ﬁrst and

then mount the new O-rings.

Wet the O-rings and back-up rings with

clean (ﬁltered) soap water.

9. Gently lever the valve plate assembly free

with the aid of a screwdriver.

11. Gently press, by hand, the valve onto the

cylinder barrel.

Mount backup

ring ﬁrst

Then mount

O-ring

7. Remove the cylinder barrel.

12. Gently push ﬂushing valve out using the

Allen key.

Service guide | Disassembling and Assembling, APP 1.5-3.5

16. Mount ﬂushing valve by pressing it into

the hole.

15. Turn ﬂushing valve upside down. If not

properly assembled, spring will fall out.

18. Replace the O-ring on the port ﬂange and

position the new cylinder barrel on the

port plate.

13. Remove spring from poppet and poppet

guide and remove O-ring from poppet

guide.

17. 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

Locating hole

Guide pin

14. 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.

O-ring

Service guide |Disassembling and Assembling, APP 1.5-3.5

21. Hold the pump together and carefully

turn it over to rest on the housing. To

prevent seizing-up, lubricate the threads

on the w screws and screw them into the

port ﬂange and he housing. Use Molykote

D paste from Dow Corning or Klüber

UH1 84-201 from Klüber lubrication.

Tighten the 2 ﬂange screws ato a torque

ccording to exploded view.

19. Positionthenewspring,newspringguide,

newretainerguide,newretainerplateand

new pistons.

24. 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 Küber UH1

84-201 from Küber Lubrication.

23. Replace the O-ring on the SAE ﬂange.

20. Position the housing on the port ﬂange

and over the guide pin.

22. Mount the new shaft seal following the

instructions on the next pages.

Wet torpedo and new shat seal with

soap. Do not use silicone grease.

Slide the shat seal over the torpedo with

carbonsealfreeface pointingupwards.Be

careful not to damage the carbon seal

facon on the shaft seal.

Service guide | Disassembling and Assembling, APP 1.5-3.5

2. Change of shaft seal

1. Unscrew the 4 mounting screws and

remove the seal SAE ﬂange.

Do not unscrew the 2 recessed screw at

this time.

Tools needed

2. Wet the shaft and shaft seal with

clean (ﬁltered) soap-water. Gently lever

theshaftsealassemblyfreewiththeaidof

2 screwdrivers.

3. Fit the hollow bush (torpedo) to the shaft.

Wet the torpedo and replacement shaft

seal with soap. Do not use silicone

grease.

Recessed

screws

Recessed

screws

4. 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.

Service guide |Disassembling and Assembling, APP 1.5-3.5

7. Push the new ceramic ring into the ﬂange

using the plastic tool provided. Make sure

the face with the rubber seal is positioned

against the shoulder in the ﬂange.

Wet the parts with clean (ﬁltered) soap-

water before assembly.

9. To prevent cold welding, lubricate

threads on the 4 screws with grease and

screw them into the pump and tighten

byhand.UseMolykote®DpastefromDow

Corningor KlüberUH184-201fromKlüber

lubrication. Tighten the 4 ﬂange screws

according to exploded view.

6. Remove ceramic ring from the ﬂange.

8. Position the O-ring on the seal SAE ﬂange.

5. Using the plastic tool provided, large

diameter ﬁrst, press the seal home against

the shoulder, by hand.

Service guide | Disassembling and Assembling, APP 1.5-3.5

Service guide |Disassembling and Assembling, APP 1.5-3.5

3. Exploded views 3.1 APP 1.5-2.5

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