Danfoss APP series, APP 0.8, APP 1.0 Service Manual

Service guide

APP pumps

APP 0.6 - 1.0
Disassembling and assembling

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Service guide | Disassembling and Assembling, APP 0.6-1.0

© Danfoss | DCS (im) | 2017.082 | 180R9092 | DKCFN.PI.013.EC5.02 | 521B0739

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 0.6-1.0

Tools needed:

• Shaft seal tool (code no. 180B4142)

• Seal set (code no. 180B4141)

• 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. Removal of flushing valve.............................................................................................................................................6

3. Change of shaft seal .......................................................................................................................................................7

4. Exploded view APP 0.6-1.0 ........................................................................................................................................ 10

Service guide | Disassembling and Assembling, APP 0.6-1.0

© Danfoss | DCS (im) | 2017.08 180R9092| DKCFN.PI.013.EC5.02 | 521B0739| 3

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.

Service guide | Disassembling and Assembling, APP 0.6-1.0

© Danfoss | DCS (im) | 2017.084 | 180R9092 | DKCFN.PI.013.EC5.02 | 521B0739

8. Remove the port plate and guide pin.

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. 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