Flowserve LR Worthington - Manual (Page 33)

LR, LRV, LLR and LR-S USER INSTRUCTIONS ENGLISH 71569088 08-10
Page 33 of 48 flowserve.com
c) Fit the two shaft sleeves, top O-ring, drive end shaft
nut, bottom sleeve end cap and socket headed cap
screw. Take care to protect the sleeve O-ring from
damage on the shaft thread. It is recommended
Loctite 243 or equivalent is used to lock the socket
headed cap screw in the shaft.
d) Lightly secure the impeller on the shaft. Take care
to protect the bearing surface on the bottom shaft
sleeve. The shaft sleeves and shaft nuts define
the impeller position on the pump shaft and hence
in the pump casing. Initially position the impeller
centrally on its keyway. This position may be
adjusted slightly, later on in the assembly process.
e) It is recommended that gasket sealing compound
(Loctite 574 or equivalent) is used between sleeve
and impeller mating faces to protect the shaft from
the liquid pumped.
f) The rotating parts of the mechanical seal can be
slid onto the top shaft sleeve [2450.2] before it is
fitted on to the shaft. The seal retaining ring
should be left loose.
Refer to any special instructions supplied
with the mechanical seal.
g) If gland packing is used fit stuffing box throttling
bush and gland.
h) Fit seal cover complete with seal seat, inboard
shaft seal ring and drive end bearing cover
complete with gasket.
i) Fit the ball thrust bearing at the drive end onto the
shaft. The 5LRV15, 6LRV13, 6LRV16 and 6LRV18
pumps have bearing disc spacers fitted to the shaft
at the drive end - ensure this is fitted before the
bearing is assembled to the shaft. The bearing must
be heated up to 100 ºC (212 ºF) using a hot plate, oil
bath or induction heater and slid onto the shaft.
Ensure bearing is fully seated against the shaft
shoulder and bearing disc spacer, where fitted.
j) Fill both sides of bearing with grease.
k) Fit the bearing lockwasher and tighten the
bearing nut. Bend over a tab of lockwasher into
bearing nut slot.
l) Slip casing wear rings complete with anti-rotation
screws loosely over impeller hubs.
m) Slide the bearing housing over the drive end
bearing. All pumps except the 10LR17 and
10LR18 have a shim fitted between the outside
diameter of the drive end bearing and the bearing
housing. Ensure shim is seated against the
shoulder in the bearing housing before sliding
housing over the bearing. Ensure bearing is
located square in the housing bore.
n) One third fill the space between bearing cover
and bearing with grease.
o) Secure bearing cover, complete with gasket.
p) Fit outboard shaft seal ring.
q) Fit the coupling hub.
6.10.3.6 Casing lower half
a) Coat the bearing housing to casing face with
liquid sealant to protect against corrosion.
b) Place the complete rotating assembly into the
casing ensuring that wear rings are in the correct
position and the anti-rotation grub screws are
located in the slots on the horizontal flange.
c) Locate the dowel bushings within the holes in the
lower half casing and bolt the bearing housing to
the casing. The dowel bushes must be sprayed
with anti-seize compound (Molyslip or equivalent)
before assembly into the bearing housing/casing.
d) Lightly torque up the fixing screws.
e) Centralize the impeller within the casing waterway by
adjusting the shaft nut and socket head capscrew, if
necessary. Apply locking compound (Loctite 222 or
equivalent) to the threads of the capscrew.
f) Fully tighten the shaft nut and socket head
capscrew and lock the shaft nut with the two
radial socket head grub screws.
g) Set the mechanical seal to the correct working
length and tighten the seal retaining ring screws.
Refer to any special instructions supplied
with the mechanical seal.
6.10.3.7 Casing upper half
a) Lower the casing upper half over the lower half.
Take care to ensure the wear rings are correctly
located in the upper half bores.
b) Drive home the two casing roll pins to accurately
position the casing and torque up all horizontal
flange screws [6570.1 and 6570.2].
c) Using a sharp flexible bladed knife, cut off the
exposed casing gasket in the stuffing box area
flush with the stuffing box face.
d) Secure bottom bearing carrier complete with
bearing bush and O-ring seal into stuffing box bore.
e) Fully torque up bearing carrier fixing screws [6570.5].
f)
Check for free rotation.
g) Apply silicon rubber sealant along the horizontal
joint line on the stuffing box face at drive end and
fit seal cover complete with gasket or O-ring. Take
care not to damage O-ring, if fitted, and locate
cover squarely on stuffing box face. Some seal
covers do not have a spigot location in the casing
bore and care must be taken to ensure the seal
seat bore is concentric to the shaft sleeve. This
is best achieved using feeler gauges between the
stationary seal seat bore and the shaft sleeve.