Danfoss APP S 2.0-3.5, APP S 674 2.0-3.5 Service guide

Instruction

APP S / APP S 674 pumps

APP S 2.0-3.5 / APP S 674 2.0-3.5 pumps Disassembling and assembling

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Instruction	Disassembling and assembling APP S 2.0-3.5 / APP S 674 2.0-3.5
Table of Contents	1.	Disassembling the pump..............................................................................................................................................	3
	2.	Assembling the pump....................................................................................................................................................	7
	3.	Disassembling and assembling of the swash plate .........................................................................................	13
	4.	Disassembling and assembling of cylinder barrel and valve plate ...........................................................	14
	5.	Disassembling and assembling of the flushing valve.......................................................................................	15
	6.	How to replace the shaft seal.....................................................................................................................................	15
	7.	Changing pistons .........................................................................................................................................................	16
	7.1	Disassembling..................................................................................................................................................................	16
	7.2	Assembling.......................................................................................................................................................................	18
	8.	Spare parts list APP S 2.0-3.5 ....................................................................................................................................	20
	8.1	Explode view APP S 2.0-3.5.........................................................................................................................................	21
	9.	Spare parts list APP S 674 2.0-3.5 ............................................................................................................................	22
	9.1	Explode view APP S 674 2.0-3.5.................................................................................................................................	23
	10.	When should the pistons be replaced ..................................................................................................................	24

Introduction	NOTE: If the pump is disassembled within the warranty period, the pump is no longer covered
	by the warranty.
	This document covers the instructions for	Tools needed:
	disassembling and assembling the axial piston	•	6 mm allen key
	pumps APP S 2.0-3.5 / APP S 674 2.0-3.5 pumps.	•	8 mm allen key
	Important: It is essential that the pump is	•	Torque wrench
		•	2 screwdrivers
	serviced in conditions of absolute cleanliness.	•	1 press bush tool (part of seal kit)
	For a better understanding of the pump, please	•	Distance block
	see the exploded view in section 7.

Note:

When disassembling and assembling it must be possible to place the pump vertically with the shaft pointing downwards. This can be done with a distance block with a minimum height of 50 mm.

Our CLP RO pumps have changed the name as listed below:

CLP674 050-058 RO: will now be called APP S 674 3.0-3.5

CLP 674 085-152 RO: will now be called APP S 674 5.1-9.0

CLP674 365-640 RO: will now be called APP S 674

This is ONLY a name change.

2	180R9281 | 521B1275 | DKCFN.PI.013.C5.02 | 07.2019

Instruction	Disassembling and assembling APP S 2.0-3.5 / APP S 674 2.0-3.5

1.Disassembling the pump

1.Disconnect the pump from the rest of the system.

3. Remove shaft seal bushing.

5.Remove ceramic ring from cover by carefully pushing it from the back of the sealing ring with a screwdriver.

2.Using a 6 mm allen key, unscrew the 3 bolts from shaft seal cover.

4. Remove O-ring with a small screwdriver.

6.Clean and then wet the shaft with clean water.

180R9281 | 521B1275 | DKCFN.PI.013.C5.02 | 07.2019

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Instruction	Disassembling and assembling APP S 2.0-3.5 / APP S 674 2.0-3.5

7.Through the inlet port lever the shaft seal with a screw driver between shaft seal and spring. Use one hand to pull the shaft seal up.

WARNING:

Be careful not to scratch the shaft.

9.Carefully remove the spring by lifting it with a screwdriver and one hand to pull the spring up.

11.Place pump on a distance block. Make sure there is enough free space for the shaft beneath the housing. Remove all bolts.

8.Carefully remove the shaft seal and distance ring.

10.Using a 8 mm allen key, unscrew all bolts on the end flange.

12. Remove end flange.

4	180R9281 | 521B1275 | DKCFN.PI.013.C5.02 | 07.2019

Instruction	Disassembling and assembling APP S 2.0-3.5 / APP S 674 2.0-3.5

13.Swash plate must be placed so that its surface is not scratched. For further disassembling of swash plate, see page 14.

15.Remove the retainer plate with the remaining pistons.

17. Remove the retainer guide and the spring.

14.Remove 2 pistons. Be careful not to scratch the pistons.

WARNING:

Do not use any tools.

16. Remove the retainer ball.

180R9281 | 521B1275 | DKCFN.PI.013.C5.02 | 07.2019

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Instruction	Disassembling and assembling APP S 2.0-3.5 / APP S 674 2.0-3.5

18. Remove the guide pin.

20.Place cylinder barrel upside down. For further disassembling of cylinder barrel and valve plate see page 14.

22.Remove the guide pin.

Note: The following operation is only necessary if O-ring on port flange has to be changed.

19.Pull the cylinder barrel straight upwards in a continuous lift to ensure no damage of house bearing. This can only be done if the shaft seal is removed.

WARNING:

If the cylinder barrel is dropped or lowered too fast into housing, the main bearing/shaft bearing might be damaged.

21.Remove the port plate in the housing by hand.

23.Turn the pump upside down. Unscrew the 8 bolts in port flange.

6	180R9281 | 521B1275 | DKCFN.PI.013.C5.02 | 07.2019

Instruction	Disassembling and assembling APP S 2.0-3.5 / APP S 674 2.0-3.5

24. Remove bolts and port flange.

	2. Assembling the pump
		WARNING:
		Do not use silicone when assembling the
		pump. Do not reuse disassembled O-rings;
		they might be damaged. Always use new
		O-rings.

Important:

It is essential that the pump is serviced in conditions of absolute cleanliness. All parts must be absolute clean before mounting.

1.Lubrication:

•To prevent seizing-up, lubricate all threads with PTFE lubrication type.

•O-rings inside pump may be lubricated only with clean filtered water.

•O-rings for port flange, mounting flange and flushing valve must be lubricated.

•It is important to lubricate ALL parts to be assembled with clean filtered water (Especially all PEEK parts).

2.Place the housing with pump label pointing downwards and insert guide pin for positioning the port flange on housing.

180R9281 | 521B1275 | DKCFN.PI.013.C5.02 | 07.2019

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Instruction	Disassembling and assembling APP S 2.0-3.5 / APP S 674 2.0-3.5

3.Mount new O-ring on port flange and lubricate with water.

5.Carefully press the port flange downwards. Do not squeeze the O-ring. If the O-ring is damaged, the pump will leak.

7. Place a 10.5 mm guide pin in the port flange.

4.Position port flange by aligning pin hole over guide pin.

6.Lubricate the threads with PTFE lubrication. Insert screws on the port flange. Tighten screws to a torque of 30 ± 3 Nm.

8	180R9281 | 521B1275 | DKCFN.PI.013.C5.02 | 07.2019