Danfoss APP S 5.1-9.0, APP S 674 5.1-9.0 Service guide

Instruction

Disassembling and assembling

APP S 5.1-9.0 / APP S 674 5.1-9.0

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Instruction | Disassembling and assembling APP S 5.1-9.0 / APP S 674 5.1-9.0

Table of Contents	1.	Introduction........................................................................................................................................................................	2
	2.	Disassembling the pump...............................................................................................................................................	3
	3.	Assembling the pump....................................................................................................................................................	7
	4.	Disassembling and assembling of the swash plate............................................................................................	13
	5.	Disassembling and assembling of cylinder barrel and valve plate..............................................................	14
	6.	Disassembling and assembling of the flushing valve......................................................................................	15
	7.	How to replace the shaft seal.....................................................................................................................................	15
	8.	Changing pistons............................................................................................................................................................	16
	8.1	Disassembling..................................................................................................................................................................	16
	8.2	Assembling.......................................................................................................................................................................	18
	9.	Spare parts list APP S (674) 5.1-9.0...........................................................................................................................	20
	9.1	Exploded view APP S (674) 5.1-9.0...........................................................................................................................	21
	10.	When should the pistons be replaced....................................................................................................................	22

1. Introduction	This document covers the instructions for disassembling and assembling the axial piston pumps
	APP S 5.1-9.0 / APP S 674 5.1-9.0

Important: It is essential that the pump is serviced in conditions of absolute cleanliness.

For a better understanding of the pump, please see the exploded view in item 9.

Note:

For 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.

Tools needed:

•10 mm combination wrench

•13 mm combination wrench

•Torque wrench

•2 screwdrivers

•1 press bush tool

•Adjustable pin wrench

•Distance block

Note:

This document covers different pump sizes. Therefore the images shown in the instruction may differ from your actual pump and parts, however, the priciples of disassembling/ assembling will be the same.

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Instruction | Disassembling and assembling APP S 5.1-9.0 / APP S 674 5.1-9.0

2.Disassembling the pump

1. Disconnect the pump from the rest of the
system.	2. Lubricate shaft with clean filtered water.

		4. Using a 10 mm combination wrench,
		unscrew the four bolts from shaft seal
		cover.
		WARNING!
		While unscrewing the bolts with one
		hand hold the shaft seal cover with the
		other hand. This is done to ensure, the
3. Carefully remove the stop bush ring and		cover does not pop out and damage the
the O-ring with a screwdriver.		ceramic ring.

5.Place two (!) bolts in threaded holes in the shaft seal cover to remove it without damaging the ceramic ring.

WARNING!

Be careful, the shaft has sharp edges.

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Instruction | Disassembling and assembling APP S 5.1-9.0 / APP S 674 5.1-9.0

6.Remove ceramic ring from flange by carefully pushing it from the back of the sealing ring.

7. Wet the shaft with clean water.

8.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 shaft seal and distance ring; the shaft has a sharp edge.

10.Carefully remove the spring by levering it with two screwdrivers.

11.Turn pump upside down and place pump on a distance block. Make sure there is enough free space for the shaft beneath the housing.

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Instruction | Disassembling and assembling APP S 5.1-9.0 / APP S 674 5.1-9.0

12.Using a 13 mm combination wrench, remove all the bolts on the mounting flange except the two shown in item 13.

14. Remove end flange.

16.Removethe pistonsonebyone.Becareful not to scratch the pistons. Tilt the retainer plate to horizontal position for easy removal of pistons, if required.

WARNING:

Do not use any tools.

13.Unscrew the remaining two bolts. Turn each bolt one round at the time to make sure that the flange is removed as straight upward as possible.

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

17. Remove the retainer plate.

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Danfoss APP S 5.1-9.0, APP S 674 5.1-9.0 Service guide

Instruction | Disassembling and assembling APP S 5.1-9.0 / APP S 674 5.1-9.0

19. Remove the retainer ball.

20.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.

20. Remove the retainer guide and the spring.

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

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

23.Remove, by hand, the pin.

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

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Instruction | Disassembling and assembling APP S 5.1-9.0 / APP S 674 5.1-9.0

24. Turn the pump upside down.

25.If necessary, remove the remaining screws in port flange by using a 13 mm combination wrench.

3. 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 a drain holes pointing upwards and insert pin for positioning the port flange on housing.

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

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

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

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