Danfoss APP S 674 2.0-3.5 User manual

ro-solutions.com
Instruction
Disassembling and assembling
APP S 674 2.0-3.5 pumps
MAKING MODERN LIVING POSSIBLE

Instruction Disassembling and assembling APP S 674 2.0-3.5
2180R9281 / 521B1275 / DKCFN.PI.013.C3.02 / 05.2013
1. Introduction ............................................................................3
2. Disassembling the pump ................................................................3
3. Assembling the pump...................................................................8
4. Disassembling and assembling of the swash plate ......................................14
5. Disassembling and assembling of cylinder barrel and valve plate........................15
6. Disassembling and assembling of the ushing valve ....................................16
7. How to replace the shaft seal ...........................................................17
8. Changing pistons ......................................................................17
8.1 Disassembling .........................................................................17
8.2 Assembling ............................................................................19
9. Exploded view APP S 674 2.0-3.5 pumps ................................................21
10. When should the pistons be replaced...................................................22
This document covers the instructions for
disassembling and assembling the axial piston
pumps APP S 674 2.0-3.5.
Table of Contents
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.

Instruction Disassembling and assembling APP S 674 2.0-3.5
3
180R9281 / 521B1275 / DKCFN.PI.013.C3.02 / 05.2013
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:
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.
1. Introduction Tools needed:
• 6 mm allen key
• 8 mm allen key
• Torque wrench
• 2 screwdrivers
• 1 press bush tool (part of seal kit)
• Distance block
2. Disassembling the
pump
1. Disconnect the pump from the rest of the
system.
2. Using a 6 mm allen key, unscrew the 3 bolts
from shaft seal cover.
3. Remove shaft seal bushing. 4. Remove O-ring with a small screwdriver.

Instruction Disassembling and assembling APP S 674 2.0-3.5
4180R9281 / 521B1275 / DKCFN.PI.013.C3.02 / 05.2013
5. Remove ceramic ring from cover by
carefully pushing it from the back of the
sealing ring with a screwdriver.
6. Clean and then wet the shaft with clean
water.
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.
8. Carefully remove the shaft seal and
distance ring.
9. Carefully remove the spring by lifting it
with a screwdriver and one hand to pull the
spring up.
10. Using a 8 mm allen key, unscrew all bolts on
the end ange.

Instruction Disassembling and assembling APP S 674 2.0-3.5
5
180R9281 / 521B1275 / DKCFN.PI.013.C3.02 / 05.2013
13. Swash plate must be placed so that its
surface is not scratched. For further
disassembling of swash plate, see page 14.
11. Place pump on a distance block. Make sure
there is enough free space for the shaft
beneath the housing. Remove all bolts.
Distance
block
12. Remove end ange.
14. Remove the 2 pistons. Be careful not to
scratch the pistons.
WARNING:
Do not use any tools.
15. Remove the retainer plate with the
remaining pistons.
16. Remove the retainer ball.

Instruction Disassembling and assembling APP S 674 2.0-3.5
6180R9281 / 521B1275 / DKCFN.PI.013.C3.02 / 05.2013
17. Remove the retainer guide and the spring.
18. Remove the guide pin. 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.
20. Place cylinder barrel upside down. For
further disassembling of cylinder barrel
and valve plate see page 15.
21. Remove the port plate in the housing by
hand.

Instruction Disassembling and assembling APP S 674 2.0-3.5
7
180R9281 / 521B1275 / DKCFN.PI.013.C3.02 / 05.2013
22. Remove the guide pin.
Note: The following operation is only
necessary if O-ring on port ange has to
be changed.
23. Turn the pump upside down. Unscrew the
8 bolts in port ange.
24. Remove bolts and port ange.

Instruction Disassembling and assembling APP S 674 2.0-3.5
8180R9281 / 521B1275 / DKCFN.PI.013.C3.02 / 05.2013
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.
1. Lubrication:
• To prevent seizing-up, lubricate all threads
with PTFE lubrication type.
• O-rings inside pump may be lubricated
only with clean ltered water.
• O-rings for port ange, mounting ange
and ushing valve must be lubricated.
• It is important to lubricate ALL parts to be
assembled with clean ltered water
(Especially all PEEK parts).
2. Place the housing with pump label
pointing downwards and insert guide pin
for positioning the port ange on housing.
4. Position port ange by aligning pin hole
over guide pin.
3. Mount new O-ring on port ange and
lubricate with water.
Important:
It is essential that the pump is serviced in
conditions of absolute cleanliness. All parts
must be absolute clean before mounting.

Instruction Disassembling and assembling APP S 674 2.0-3.5
9
180R9281 / 521B1275 / DKCFN.PI.013.C3.02 / 05.2013
6. Lubricate the threads with PTFE lubrication.
Insert screws on the port ange. Tighten
screws to a torque of 30 ± 3 Nm.
8. Position port plate by using the guide pin.
Do not use force for this operation.
9. Ensure port plate is tted tightly against
the bottom.
Important: If valve plate is disassembled
from cylinder barrel, please see page 15
before continuing.
5. Carefully press the port ange 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 ange.

Instruction Disassembling and assembling APP S 674 2.0-3.5
10 180R9281 / 521B1275 / DKCFN.PI.013.C3.02 / 05.2013
13. Lubricate and position the retainer guide.12. Place the spring in cylinder barrel.
14. Lubricate retainer guide and position the
retainer ball.
15. Position the retainer plate.
10. Place the pump on a distance block. Make
sure, there is enough free space for the
shaft beneath the housing. Lubricate inside.
Distance
block
11. Carefully lower cylinder barrel into the
housing.
WARNING:
If cylinder barrel is dropped or lowered
too fast into housing, main bearing and
shaft bearing might be damaged.
Replacement can only be done at
Danfoss, Nordborg.