Flowserve LR Worthington - Manual (Page 28)

LR, LRV, LLR and LR-S USER INSTRUCTIONS ENGLISH 71569088 08-10
Page 28 of 48 flowserve.com
n) When removing the rotor assembly, the casing wear
rings [1500] will be attached to it. They are both
secured against rotation by one cylindrical pin [6811]
inserted into the casing wear ring and located in a
hole at 6 o’clock in the lower half casing.
o) Remove both bearing covers and circlip from
non-drive end bearing. Using bearing pullers
remove bearing housing complete with bearings
and shaft seal rings from the pump shaft. If
double row bearings are fitted the non-drive end
bearing will be secured by bearing nut [3712] and
lockwasher [6541].
p) Depending on configuration remove glands/seal
covers, packing and lantern rings/mechanical seal.
Refer to any special instructions supplied
with the mechanical seal.
q) Remove the socket head grub screws [6814.1]
securing each shaft nut. Using C-spanner remove
shaft nuts [2910]. Slide off shaft sleeves [2450].
r) Remove impeller [2200], casing wear rings and
impeller key.
The impeller is a shrink fit on the shaft and
the boss of the impeller must be heated in order to
remove it. Refer to Section 1.6, Safety, Applying
heat to remove impeller, for more details.
s) This work must only be undertaken when both
shaft nuts and sleeves have been fully removed.
t) If impeller wear rings are also fitted, they are shrunk
onto the impeller and fixed with locking grub screws
[6814.3] between their diametral mating surfaces.
u) To remove the impeller wear rings, remove the
locking grub screws and heat up the ring until it
slides off easily.
6.8.3 LRV
The pump is best removed from the system to carry
out a complete strip down. It should be set down with
the shaft horizontal to enable the pump to be
dismantled in a similar fashion to the LR and LLR.
a) Isolate motor and lock off electrical supply in
accordance with local regulations.
b) Isolate suction and discharge valves.
c) Remove coupling guards and disconnect the
coupling halves.
d) Drain pump casing and, if applicable, remove any
auxiliary piping.
e) Remove motor complete with motor stool and set
down carefully in a safe location.
f) Retain any shimming between stool and pump
casing.
g) Remove screws securing the pump suction and
discharge flanges.
h) Sling pump as shown in section 2.3 and allow lifting
gear to just take the pump weight. Remove screws
securing the pump casing to the baseplate.
i) Remove the pump to a safe location and
manoeuvre the pump shaft into a horizontal
position.
j) Remove the pump half coupling.
k) Unbolt the seal cover from the casing at the drive
end.
l) Remove the bottom bearing carrier [3240] (non-
drive end) complete with bearing bush [3300],
taking care not to damage the bearing surfaces.
m) With a suitable punch, drive out the two straight
roll pins which are used on the horizontal split
flange to align the upper and lower half casings
[1214 and 1213].
n) Carry on as for LR and LLR section 6.8.1, j) to k).
o) Lift out rotor assembly. Use care in slinging,
handling, and supporting of the rotor for subsequent
dismantling. Place rotor securely on two support
blocks. Protect the bearing surface on the outside
diameter of the bottom shaft sleeve from damage.
p) Remove drive end bearing cover, outboard shaft
seal ring [4305.2] and slide bearing housing [3200]
off the bearing. Some pump sizes have a shim
fitted – retain for future use.
q) Release the bearing lockwasher [6541] and remove
the bearing nut [3712]. Pull off drive end thrust ball
bearing using a suitable puller, ensuring force is
applied to inner race only. Remove the bearing
cover and inboard shaft seal ring [4305.1].
r) Depending on configuration remove the gland/seal
cover, packing and lantern ring/mechanical seal
from the drive end.
Refer to any special instructions supplied
with the mechanical seal.
s) Remove the two socket head grub screws
[6814.3] securing the shaft nut [2910.1] at the
drive end. Using a C-spanner remove shaft nut.
Slide off top shaft sleeve [2450.2].
t) Remove socket head cap screw [6579], sleeve
end cap [6415], and bottom shaft sleeve [2450.1].
Take care not to damage the bearing surface on
the sleeve.
u) Remove impeller, casing wear rings [1500] and
impeller key [6700.1].
If impeller proves difficult to remove, the use
of heat is permissible. Refer to Section 1.6, Safety,
Applying heat to remove impeller, for more details.
v) If impeller rings [2300] are fitted, they are shrunk
onto the impeller and fixed with locking grub
screws [6814.4] as for LR/LLR. To remove refer
to 6.8.1, paragraph t).