47
180R9270 / IOM APP S 674 - v01 / 03.2013
Instruction
APP S 674 pumps
10
180R9276 / 521B1245 / DKCFN.PI.013.Z1.02 / 03.2013
9.
Service and warranty
Danfoss APP S 674 pumps are designed for long
operation, low maintenance and reduced
lifecycle costs.
Provided that the pump has been running
according to the Danfoss specifications, Danfoss
guarantees 8,000 hours service-free operation,
however, max 18 months from date of produc-
tion.
If Danfoss recommendations concerning
system-design are not followed,
it will strongly
influence the life of the APP S 674 pumps
.
Maintenance:
After 8,000 hours of operation, it is strongly
recommended to inspect the pump and change
any worn parts, e.g. pistons. This is done in order
to prevent a potential breakdown of the pump.
If the parts are not replaced, more frequent
inspection is recommended according to our
service intervals.
Standstill:
The APP S 674 pumps are made of Super Duplex
materials with excellent corrosion properties.
It is always recommended to flush the pump
with freshwater when the system is shut down.
9.1 Repair
In case of irregular function of the APP S 674
pump, please contact Danfoss High Pressure
Pumps.
Instruction
APP S 674 pumps
11
180R9276 / 521B1245 / DKCFN.PI.013.Z1.02 / 03.2013
The recommended service intervals on the different parts in the APP S 674 pumps appear from the
table below:
Position Qty. for all pump sizes
Description
Material
Service interval
3.0-3.5
5.1-9.0
21-38
1
1
1
1
Housing,
main bearing
Super Duplex,
PEEK
No need for service
121
1
1
1
Port flange
Super Duplex No wear part
31
1
1
1
Swash plate
Super Duplex 40,000 hours
66
7
9
9
Pistons
Super Duplex,
PEEK
Recommended inspection on a
yearly basis; evaluate, if replace-
ment is needed
92
1
1
1
Valve plate
Super Duplex 24,000 hours
91
1
1
1
Port plate
Super Duplex,
PEEK
24,000 hours
61
1
1
1
Cylinder
barrel
Super Duplex 40,000 hours
65
1
1
1
Retainer
plate
Super Duplex 24,000 hours
64
1
1
1
Retainer ball
Super Duplex 40,000 hours
71
1
1
Retainer
guide
Super Duplex,
PEEK
40,000 hours
62
1
1
4
Spring
Hastelloy, C4
40,000 hours
63
1
Spring guide
PEEK
40,000 hours
142
1
1
Stop for shaft
seal
Super Duplex No wear part
124
1
1
1
Shaft seal
Hastelloy and
NBR/FFKM
It is good practice to change the
seal after each disassembly of the
pump
125
1
1
1
Flange for
shaft seal
Super Duplex No wear part
93
7
9
9
Back-up ring
Teflon
24,000 hours
O-ring
(overall)
NBR
24,000 hours
5, 123,
126, 127,
128,
133,147,
153
Screw
(overall)
AISI 316
No wear part
Pin (overall)
AISI 316, PEEK
Pin (overall)
AISI 316,
Super Duplex
No wear part
152
1
1
1
Valve cone
(flushing
valve)
Super Duplex,
PEEK
40,000 hours
134
2
Bleeding
screw
Super Duplex No wear part
3
2
4
Bleeding
screw
Super Duplex No wear part
67
1
1
1
Parallel key
AISI 316
40,000 hours
9.2 Recommended service intervals