Danfoss APP series Manuale utente

Service guide

APP pumps

APP(W) 5.1-10.2

Disassembling and assembling

hpp.danfoss.com

Service guide |Disassembling and Assembling, APP(W) 5.1-10.2

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(W) 5.1-10.2

Tools needed:

• Toolset (code no. 180B4162)

• Seal set (code no. 180B4161)

• Screwdriver

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 the pump..............................................................................................................................................3

2. Assembling the pump ...................................................................................................................................................5

3. Disassembling swash plate..........................................................................................................................................6

4. Assembling swash plate................................................................................................................................................7

5. Change of shaft seal .......................................................................................................................................................8

6. Exploded view for APP (W) 5.1-10.2 ...................................................................................................................... 12

Service guide | Disassembling and Assembling, APP(W) 5.1-10.2

1. Disassembling the pump

2. Unscrew the 8 screws in the mounting

ﬂange.

5. Carefully remove the shaft seal assembly

using the shaft-seal extractor supplied,

provided with the tool set. The extractor

must ﬁt underneath the shaft seal.

7. Remove the pistons, retainer plate, stop

bush and retainer ball from the cylinder

barrel.

1. Unscrew the seal-retaining ring

counterclockwise and remove it.

4. Wet the shaft and shaft seal with clean

(ﬁltered) water.

3. Carefully remove the mounting ﬂange

from the housing.

6. Remove the whole cylinder barrel and

carefully place it on a suitable clean

surface.

Service guide | Disassembling and Assembling, APP(W) 5.1-10.2

8. Carefully remove the valve plate assembly

using a screwdriver.

11. Mount the new O-rings.

13. Remove the port plate by hand.

10. Mount the new back-up rings on the new

valve plate.

9. Remove the O-rings and back-up rings

from the valve plate.

12. Carefully press, by hand, the cylinder

barrel onto the valve plate.

Mount backup

ring ﬁrst

Then mount

O-ring

Service guide | Disassembling and Assembling, APP(W) 5.1-10.2

Important: It is essential that the pump is

serviced in conditions of absolute cleanliness. WARNING: Do not reuse disassembled O-ring

or shaft seal as they might be damaged.

2. Assembling the pump

5. Position all the pistons, one in each piston

bore, in the cylinder barrel. It may be

necessary to tilt the retaining ring to allow

the pistons to ﬁt into the piston bores.

4. Carefully position all the pistons into the

retainer plate.

3. Fit the retainer guide onto the shoulder of

the shaft.

7. Mount the new shaft seal following the

instructions in chapter 5 see page 8-11.

6. Position the new white stop bush on top

of the retainer guide.

2. Carefully slide the cylinder barrel into the

housing.

1. When mounting the port plate 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.

Guide pin

Service guide | Disassembling and Assembling, APP(W) 5.1-10.2

11. Mount the seal retainer ring Tighten the

ring with a torque of 60 ± 5 Nm.

Turn each screw 2 rounds at a time to

ensure the ﬂange is mounted as straight as

possible Tighten the screws to a torque of

30 ±3 Nm.

To prevent seizing-up, lubricate

the threads on the 8 screws with grease,

screw them into the pump and tighten by

hand. Use Molykote® D paste from Dow

Corning or Klüber UH1 84-201 from Klüber

lubrication.

10. Screw the 8 screws into the ﬂange and the

housing.

8. Position the guide pin in the housing.

9. Position and carefully press, by hand, the

combined ﬂange and swash plate into the

housing.

IMPORTANT: Ensure not to cut the O-ring.

2. Turn the mounting ﬂange upside down.1. Unscrew the screw in the mounting ﬂange.

3. Disassembling swash

plate

Guide pin

Service guide | Disassembling and Assembling, APP(W) 5.1-10.2

2. Mount the spacer on the swash plate.1. Replace the O-rings.

3. Remove the swash plate and the spacer.

3. Position the swash plate on the mounting

ﬂange using the guide pins and ﬁx it with

the screw.

4. The mounting ﬂange is now ready to be

mounted on the housing.

4. Assembling swash plate

Service guide |Disassembling and Assembling, APP(W) 5.1-10.2

5. Change of shaft seal

1. Unscrew the seal retaining ring

counterclockwise and remove it.Tools provided according to 180B4162

3. Carefully remove the ﬂange from the

casing.

4. Wet the shaft and shaft seal with clean

ﬁltered water.

2. Unscrew the 8 screws in the mounting

ﬂange.

5. Carefully remove the shaft seal assembly

using the shaft-seal extractor supplied.

The extractor must ﬁt underneath the

shaft seal.

Service guide | Disassembling and Assembling, APP(W) 5.1-10.2

7. Scrap the old stop bush (if black) and

place the new white stop bush on top of

the retaining guide.

10. Slide the new shaft seal over the torpedo

with the carbon seal face pointing

upwards (see also drawing on last page).

IMPORTANT: Be careful not to damage

the carbon seal face on the shaft seal.

6. Ensure that no dirt has entered into the

pump.

IMPORTANT: If loose particles are

observed, the pump must be

dismantled and thoroughly cleaned

with clean ﬁltered water.

8. Fit the hollow bush (torpedo) onto the

shaft.

9. Thoroughly wet the torpedo, shaft and

replacement shaft seal with plenty of clean

ﬁltered water. Do not use silicone grease.

11. Use the plastic assembly tool provided,

large diameter pointing downwards, to

press the seal home against the shoulder

of the spacer.

Service guide |Disassembling and Assembling, APP(W) 5.1-10.2

12. Remove the old O-ring and ﬁt the

new O-ring on the adapter.

14. Screw the 8 screws into the ﬂange and

the casing. To prevent cold welding,

lubricate the threads on the 8 screws

with grease, screw them into the pump

and tighten by hand. Use Molykote® D

paste from Dow Corning or Klüber UH1

84-201 from Klüber lubrication.

13. Place the guide pin in the casing. Position

the combined ﬂange and swash plate onto

the guide pin and press it gently, by hand,

into the casing.

Ensure not to squeeze the O-ring.

15. Remove the ceramic ring from the seal

retaining ring.

16. Wet the parts with clean ﬁltered water.

Guide pin

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