Flowserve HWX Worthington - Manual (Page 26)

HWX USER INSTRUCTIONS ENGLISH - 07/14
Page 26 of 40
As a reminder of the orientation of the
casing cover and the bearing housing you might
match mark these parts before separating them;
however, the OUTLINE drawing shows the factory
orientation.
To disassemble the pullout element, soft cable (or
equivalent) and lifting equipment should be handy
and used for heavy parts. Proceed as follows:
a) Secure bearing housing [3200] to workbench in a
position that will allow impeller [2200] and casing
cover [1221] to be pulled away from shaft [2100]
and bearing housing [3200].
b) Secure shaft [2100] to prevent rotation.
The impeller cap nut [2912] is left-
hand threaded. To remove the impeller cap
nut, turn it to the right (clockwise) while
facing the impeller.
c) Untight the security dowel of the cap nut [2912]
and remove it from shaft.
d) Use heat, if necessary, on impeller [2200] and
remove it from shaft.
e) Remove impeller key [6700.1].
f) Install the mechanical seal spacers to lock the
shaft sleeve to the seal plate. Then loosen the set
screws which hold the shaft sleeve to the shaft.
g) Unscrew cap screws that hold bearing housing
[3200] to casing cover [1221] and tap casing
cover and bearing housing with mallet to break
cover loose from housing.
The impeller cap nut [2912] is left-
hand threaded. To remove the impeller cap
nut, turn it to the right (clockwise) while
facing the impeller.
h) Hold shaft sleeve in place and carefully slide
casing cover [1221] with sleeve and mechanical
seal parts off shaft and clear of bearing housing
[3200].
The stuffing box bushing [4133] is
pressed into the casing cover [1221] and
should not be removed unless worn or badly
scratched or gouged, in which case the old
bushing must be pressed out and a new one
pressed in.
i) Set casing cover [1221] on workbench with
bearing-housing side up.
To disassemble a mechanical seal
follow the seal manufacturer's instructions in
the Appendix.
j) Remove the seal plate nuts and the mechanical
seal.
k) If no pumpage has got into bearing
housing and you plan to replace just the
mechanical seal, omit the remaining steps;
otherwise continue to disassemble pump as
outlined.
l) Evenly heat pump half-coupling using a welding
torch with a Rosebud head until you are able to
pull half-coupling off with a coupling puller, then
remove half-coupling and key [6700.4].
m) Remove outboard fan [if applicable 8161.1] and
screws [6577.4]. Loosen screw [6579.4] on vent
ring [2500] and slide off shaft.
n) Unscrew bearing housing end cover cap screws
and slide end cover [1220] off shaft. If your pump
is oil lubricated, remove and retain the cover
plate [3260].
Although not necessary, it may be
worthwhile to lift the bearing housing and
block it in a vertical position with the thrust
bearing up to facilitate removal of the shaft
and bearings. Support shaft as it is moved out
of bearing housing by soft cables and hoist or
wood blocks.
o) Remove shaft [2100], with thrust bearings [3013]
and radial bearing [3010] installed, from bearing
housing [3130].
p) Proceed as follows:
•
Loosen the set screws which hold the screw
pump to the shaft, then slide the screw pump
[4223] off of the shaft.
q) Place shaft in a vice which is covered with a soft
material such as copper to prevent marring; then
clamp it just enough to keep it from turning when
thrust bearing lock nut [3712] is broken loose.
r) Bend back tab on thrust bearing lock washer
[6541]. Unscrew thrust bearing lock nut [3712].
Facing the bearing nut, turn it clockwise to
loosen. Remove lock nut and lock washer from
shaft.
s) Remove shaft from vice and press bearings
[3013 – 3010] off shaft with hydraulic press, if
available; otherwise, leave shaft in vice and pull
bearings off shaft with a bearing puller.
t) If your pump is oil lubricated: The grease catcher
[3865] should only be removed if there is
evidence of leakage. If the cover is to be
removed, remove the cap screws and slide the
cover out of the bearing housing.
6.7 Examination of parts
Used parts must be inspected
before assembly to ensure the pump will
subsequently run properly.