Flowserve L Worthington Simpson - Manual (Page 26)

L and U USER INSTRUCTIONS ENGLISH 85392721 07-12
Page 26 of 36 flowserve.com
match the pipe tap opening in the casing.
Do NOT use these methods to lift the
bottom half or complete pump casing.
6U18H only
j)
Remove the bearing housing to casing screws
[6570.1] and remove the 2 dowel bushings on
each side. A tool for removing the bushings can
be easily and economically made as shown in the
following diagrams:
Material: 25 mm (1 in.) standard weight steel pipe
L o w e r h a l f c a s i n g
B e a r i n g h o u s i n g
D o w e l b u s h
P u l l e r
p a r t s
6.8.2 Bearing housing assembly
NB When dismantling, for convenience at reassembly,
lay out all parts in the order in which they are removed.
Proceed as follows:
a) Remove the guards.
b) Disconnect the coupling halves. (If oil lubricated
couplings are used, drain the oil before unbolting.)
c) Unbolt the glands/seal covers [4130] from the
casing.
d) Remove the bolts that hold the upper and lower
half of the casing together and remove the upper
half [1214].
e) Tapped holes are provided in the joint flange to
enable the use of forcing bolts to loosen the joint.
f) To lift the casing upper half only, proceed as
follows. Securely hook slings around the two
integral lifting lugs on the upper half casing or,
where there are no integral lifting lugs, remove the
pipe plug [6569.1]or fittings, if used, from the volute
vent connection located on top of the casing upper
half and install a special steel lifting eye with a
threaded shank to match the pipe top opening in
the casing.
Do NOT use these methods to lift the
bottom half or complete pump casing.
g) Remove the bearing housing to casing bolts from
the end of, and beneath the bearing housing
[6570.1].
h) Lift out rotor assembly. Use care in slinging and
handling of the rotor.
i) Loosen bearing covers [3260] and remove bearing
housing [3200].
j) Remove bearing covers, bearing housings,
bearing nut and ball bearings [3011].
k) Remove glands, packing and seal cages [4120,
4130, 4134].
l) Remove shaft sleeve nuts and shaft sleeves
[2910, 2450].
m) Remove impeller(s), casing rings and impeller key
[2200, 1500, 6700].
6.9 Examination of parts
Used parts must be inspected before
assembly to ensure the pump will subsequently run
properly. In particular, fault diagnosis is essential to
enhance pump and plant reliability.
6.9.1
Casing, seal housing and impeller
Inspect for excessive wear, pitting, corrosion, erosion
or damage and any sealing surface irregularities.
Replace as necessary.
6.9.2
Shaft and sleeve (if fitted)
Replace if grooved, pitted or worn.
6.9.3
Gaskets and O-rings
After dismantling, discard and replace.
6.9.4
Bearings
It is recommended that bearings are not re-used after
any removal from the shaft.
6.10 Assembly
To assemble the pump consult the sectional drawings,
see section 8, Parts lists and drawings.
6.10.1 Impeller wear rings
a) Impeller rings (when fitted) should be heated up
to approximately 100 ºC (212 ºF) using a hotplate
or hot oil bath and then slipped onto the impeller
and pressed down to the shoulder. (Do NOT use
a steel hammer to knock them into position.)
b) Drill and tap 3 holes approximately 120 degrees
apart into the diametral mating faces of the ring
and impeller and insert socket head grub screws.
(The existing half tapped holes from the removed
impeller ring cannot be re-used.)