Service guide
Changing motor flange
APP / APP S / APP S 674 53-86
hpp.danfoss.com
Service guide | Changing motor flange APP / APP S / APP S 674 53-86
Table of Contents
1. Introduction
Contents
1. Introduction ....................................................................................................................................................................... 2
2. Disassemble motor flange ............................................................................................................................................ 3
3. Assembly motor flange .................................................................................................................................................. 5
4. Exploded view ................................................................................................................................................................... 7
This document covers the instructions for changing motor flange on the axial piston pumps APP
/ APP S / APP S 674 53-86.
Important: Place the pump horizontally on
a pallet or other stable surface above the
ground. Ensure that the pump cannot roll.
Tools provided with toolset 180Z0665:
• 1 x cone bushing extractor
• 1 x M8 x 140 screw
• 3 x M8 x 70 screws with nuts
• 3 x valve plate fixation
• 2 x M6 x 65
• 2 x tool washer
• 1 x M16 pin and nut
• 1 x ø30/17 x 3 washer
• 1 x shaft seal press bush tool
• 1 x bracket
• 1 x 8 mm Allen key
• 1 x 6 mm Allen key
For a better understanding of the pump, please
see the exploded view in section 4.
• 1 x M8 x 40 with nut
• 2 x combination wrench 13mm
• 1 x combination wrench 24 mm
• 1 x combination wrench 30 mm
• 1 x 24 mm socket (½”)
• 1 x torque wrench (½”)
• 1 x valve plate tool
• 2 x screw drivers, 5.5 x 1mm
• 1 x NV24 flush valve tool
• 2 x M8 x 16 bolts
• 1 x valve plate mount
2 | © Danfoss | DCS (im) | 2017.11
180R9403 | 521B1470 | DKCFN.PI.013.1I.02
Service guide | Changing motor flange APP / APP S / APP S 674 53-86
2. Disassemble motor
flange
1. Remove the coupling and shaft key (if
your pump model is an APP S / APP S
674 there are no shaft key. The shaft has a
spline instead).
3. If necessary, replace the O-ring.
2. Remove the 4 M6 screws from the cover
for shaft seal. Use 2 M6 screws to extract
the cover mounting them into the threads
in the cover for shaft seal.
4. Replace 3 screws with the 3 M8x70 screws
so they are equally separated from each
other. Torque the screws slightly and
fasten the nuts until they make contact
with the motor flange. Remove the
remaining screws.
© Danfoss | DCS (im) | 2017.11
5. Install guide screw in the top. Loosen the
three nuts sequentially one round at a
time, so the end flange comes out
as straight forward as possible.
Use two combination wrenches so you do
not unscrew the screws while loosening
the nuts.
6. Slide the motor flange out, using the
guide pin to protect the shaft seal. Make
sure the guide pin in the housing remains
in place.
180R9403 | 521B1470 | DKCFN.PI.013.1I.02 | 3
Service guide | Changing motor flange APP / APP S / APP S 674 53-86
7. Remove the shaft seal by hand or using a
screw driver between the washer and the
shaft seal, if needed.
8. Loosen the 2 screws holding the swash
plate.
4 | © Danfoss | DCS (im) | 2017.11
180R9403 | 521B1470 | DKCFN.PI.013.1I.02
Service guide | Changing motor flange APP / APP S / APP S 674 53-86
3. Assembly motor flange
1. Transfer guide pins and O-rings to the new
motor flange. Also transfer or replace the
main O-.ring.
3. Install new motor flange using the guide
screw. Ensure the motor flange fits the
guide pin in the housing.
2. Install swashplate on new motor flange.
Tighten screws according to the torque
specified on the xploded view in section 4.
4. Screw the 3 M8x70 screws with nuts in
three threads so they are equally
separated from each other. Torque the
screws slightly and fasten the nuts until
they make contact with the motor flange.
© Danfoss | DCS (im) | 2017.11
5. Fasten the 3 nuts one turn at a time to
press the motor flange into the housing as
straight forward as possible.
6.
When the motor flange reaches the
housing, the motor flange is in the right
position. Mount the rest of the screws,
replace the 3 M8x70 with normal screws
and fasten all of them according to
exploded view in section 4.
180R9403 | 521B1470 | DKCFN.PI.013.1I.02 | 5
Service guide | Changing motor flange APP / APP S / APP S 674 53-86
7. Lubricate shaft and shaft seal with clean
filtered water. Mount washer for shaft seal.
Mount shaft seal and use the shaft seal
press bush to press it in.
9. Re-install the key.
8. Carefully re-install the cover for shaft seal
with the ceramic ring. Tighten the
4 screws according to the torque specified
on the exploded view. in section 4.
6 | © Danfoss | DCS (im) | 2017.11
180R9403 | 521B1470 | DKCFN.PI.013.1I.02
Service guide | Changing motor flange APP / APP S / APP S 674 53-86
4. Exploded view
© Danfoss | DCS (im) | 2017.11
180R9403 | 521B1470 | DKCFN.PI.013.1I.02 | 7
Danfoss A/S
High Pressure Pumps
DK-6430 Nordborg
Denmark
© Danfoss | DCS (im) | 2017.11
180R9403 | 521B1470 | DKCFN.PI.013.1I.02 | 8
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