Flowserve Worthington WXB - Manual (Page 39)

WXB USER INSTRUCTIONS ENGLISH - 07/14
Page 39 of 51
7.5 Setting impeller clearance
No axial adjustment of the rotor is necessary.
The rotor is not moving during operation.
7.6 Disassembly
See 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.
7.6.1 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 [2100] and take out the key [6700.2].
Ensure that the motor is
locked against start up.
If applied pull off the vane.
3) Drain the oil from both bearing housings, using the
plug [6569.1]. If required disconnect all auxiliary
pipings and auxiliary devices like vibration probes,
temperature probes, etc.
4) Due to the design with casing [1100] the complete
rotor of the pump can be taken out of the barrel
without disconnecting the suction or discharge
flange connections. To facilitate the moving out of
the complete rotor through the casing [1100], push it
by help with the hexagon head bolt [6577.3] and
clamp stramp [3121.2] out of the barrel fit. Further
insert a rod with a screwed end of 1“ pipe thread
into the bore of the tool [9310] on the bearing
housing. Now the complete rotor can be easily
pulled out of the barrel. For further dismantling bring
it to the workshop.
If a spare hydraulic cartridge is available, this can be
inserted into the barrel, and the pump is back in
service in a few hours.
If the whole pump should be removed, proceed
with step 5) and 6).
5) The pump has to be disconnected from suction and
discharge pipe. The alignment of the pump and
driver has to be checked and put it down in writing.
6) Unscrew the mounting screws of the pump on the
base plate. If the discharge casing were placed on
the base plate by taper pin, remove them too. Lift
the pump to a clean area by crane or other lifting
device where the pump can be disassembled.
7.6.2 Dismantling of the line bearing side
1) Loosen hexagon head bolt [6577.1] of both bearing
covers [3260.4] and [3260.3].
2) Remove bearing cover [3260.1] together with
labyrinth ring [4330.3] and O-ring [4610.1] from the
pump.
3) Unscrew hex nuts [6581.2] and remove carefully
bearing housing [3200.2] and outer ring of radial
roller bearing [3012] with the aid of a crane from the
pump.
4) Now unscrew the shaft nut [2910.2] and pull off
lockwasher [6541.2], washer [2905.2], bearing
adaptor sleeve [2471.2], O-ring [4610.8], inner ring
of radial roller bearing [3012], sleeve [2471.2] and
O-ring [4610.8] from pump shaft.
5) Now remove bearing cover [3260.3], if necessary.
Line bearing:
NU409 2WXB
NU411 3WXB
NU413 4WXB
NU413 6WXB
7.6.3 Dismantling of the thrust bearing side
1) Unscrew the mounting screw of fan case and
remove it. Unscrew the clamping screw of fan and
pull it off from the pump shaft.
2) Loosen the hexagon head bolt [6577.1] from bearing
cover [3260.1] and loosen the hexagon head bolt
[6577.1] from bearing cover [3260.2].
3) Remove bearing cover [3260.1] together with
labyrinth ring [4330.2] from the pump.
4) Unscrew hex nuts [6581.2] and remove carefully
bearing housing [3200.1] together with the aid of a
crane from the pump.
5) Now unscrew the shaft nut [2910.1] and pull off
lockwasher [6541.1], washer [2905.1], the two thrust
ball bearings [3013], bearing adaptor sleeve
[2471.1] and the O-ring [4610.2] from pump shaft.
6) Now remove bearing cover [3260.2] ,if necessary.
Thrust bearing:
7409 BGM 2WXB
7411 BGM 3WXB
7413 BCBM 4WXB
7413 BCBM 6WXB