Flowserve ERPN-M - Manual (Page 27)

ERPN-M USER INSTRUCTIONS ENGLISH 02-08
Page 27 of 37
6.6 Setting impeller clearance
No axial adjustment of the rotor is necessary.
6.7 Disassembly
Refer to section 1.6, Safety, before
dismantling the pump.
Before dismantling the pump for
overhaul, ensure genuine Flowserve replacement
parts are available.
Refer to sectional drawings for part numbers and
identification.
6.7.1 Dismantling of pump
1) Completely drain the pump by using the drain
connection. By pumping explosive or toxic media,
flush your system with Nitrogen.
2) Remove coupling guard and uncouple the pump
from the motor. Pull off the coupling hub from the
pump shaft [415] and take out the key [422].
Ensure that the motor is
locked against start up.
If applied pull off the vane.
3) Drain the oil from the bearing housing, using the
drain connection [206]. If required disconnect all
auxiliary pipings and auxiliary devices like
vibration probes, temperature probes, ect.
4) Loose hex nuts [0291] at the pump casing and the
hex nuts of the wobble plate [488] for the
baseplate. Now you can pull out the complete
pump assembly from its casing.
Larger pumps are equipped with
jack screws [306] to pull out the pump assembly.
Be sure that the two pins
[044] are screwed in the casing for guiding the
outer rotor assembly during pulling off.
6.7.2 Dismantling of the outer rotor
1) Take out the casing gasket [398] located between
the secondary containment [471] and the pump
casing cover [470].
The casing gasket [398] shall be
renewed after each disassembly. Now the outer
rotor can be dismantled.
2) Remove retaining ring for shaft [4651] and pull
outer rotor of magnetic coupling [M02] inclusive
driving flange [465] from driving shaft [415].
Pay attention that the magnets
of outer rotor [M02] will not be damaged.
Afterwards remove keys [423].
3) Loose socket screws [021] to separate mechanical
seal unit from barrel [471] and pull it of the driving
shaft [415].
4) Now disassemble carefully seal end plate [506]
inclusive gasket [495], cylindrical pin [524] and
stationary seal ring [G01] together with stationary
seal ring packing [G03] and throttle ring [G02] from
barrel [471].
5) Furthermore pull off shaft sleeve [509] with O-ring
[450] and whole rotating unit of mechanical seal
[G04, G05, G06, G07] from driving shaft [415].
6) Next loose the hex nuts [035] of studs [034] and
separate bearing housing [470] from barrel [471].
Pay attention to O-ring [494]
which has to be renewed after every dismantling to
assure security of pump.
7) Now line bearing cover [478] together with shaft
seal [4781] can be separated from barrel [471] by
loosening the socket screws [021]. Check whether
the guard ring is worn and has to be changed.
8) Loose hex screw [031] from thrust bearing cover
[479] and pull it together with O-ring [493] and
labyrinth-type seal [4791] from bearing housing
[4791] respectively from driving shaft [415].
9) Now you can carefully pull driving shaft [415]
inclusive cylindrical roller bearing [476], deep
groove ball bearing [477], locking plate [464] and
locking nut [463] towards coupling hub out of
bearing housing [470].
10) Bend locking plate [464] and loose locking nut
[463] from shaft.
11) Pull off deep groove ball bearing [477] from driving
shaft [415] with the aid of a puller and check
whether the inner ring of cylindrical roller bearing
has to be renewed, too. There are two possibilities
to remove it from driving shaft [415].
Heat up inner ring uniformly by welding torch or
blowtorch until it slips from shaft. Take care that the
shaft stays as cold as possible because otherwise
it will get distorted.
Transport the shaft to a work bench and turn the
inner ring from shaft if there is no other possibility to
remove it.
12) Squeeze roller bearing [476] without inner ring out
of bearing housing [470].
13) Check retaining ring for bore [4761] against any
damage.
Frame Thrust bearing Line bearing
1 6306 – C3 NU 207
2 6306 – C3 NU 207
3 6309 – C3 NU 209
4 6309 – C3 NU 209