UNIREX Pump - Manual (Page 45)

MARK 3 USER INSTRUCTIONS ENGLISH 71569102 08-06
Page 45 of 68 flowserve.com
6.7.2 Pump disassembly
k) Remove the coupling hub from the pump shaft
[2100]. Close coupled pumps require the motor
adapter [3160] be removed.
l) Using the shaft key [6700], mount the impeller
wrench from the Flowserve Mark 3 tool kit (figure
6-1) to the end of the shaft. With the wrench
handle pointing to the left when viewed from the
impeller end, grasp the impeller [2200] firmly with
both hands (wear heavy gloves). By turning the
impeller in the clockwise direction move the
wrench handle to the 11 o’clock position and then
spin the impeller quickly in a counter-clockwise
direction so that the wrench makes a sudden
impact with a hard surface on the bench. After
several sharp raps, the impeller should be free.
Unscrew the impeller and remove from the shaft.
Discard the impeller gasket [4590.2].
Do not apply heat to the
impeller. If liquid is entrapped in the hub, an
explosion could occur.
m) If a cartridge type mechanical seal [4200] is used
(figure 6-10), the spacing clips or tabs should be
installed prior to loosening the set screws which
attaches the seal to the shaft or removing it from
the cover. This will ensure that the proper seal
compression is maintained.
Figure 6-10
n) Remove the seal or packing gland nuts [6580.2] if
so equipped.
o) Remove the cover.
All pumps except Sealmatic
Remove the two cap screws [6570.2] which
attach the rear cover [1220] to the adapter.
Carefully remove this part.
Sealmatic pump only
Remove the cap screws that hold the rear cover
[1220] to the repeller cover [1220.1]. For Group 3
pumps remove the capscrews [6570.2] that hold
the rear cover [1220] to the adapter [1340].
Remove the cover. The repeller is now exposed
[2200.1] and should be free to slip from the shaft.
In the event it is stuck, the repeller can be pried off
by the use of 2 screwdrivers wedged between the
repeller [2200.1] and the repeller cover [1220.1].
p) If a component type inside mechanical seal [4200]
is used, loosen the set screws on the rotating unit
and remove it from the shaft (see figure 6-11).
Then pull the gland [4120] and stationary seat off
the shaft. Remove the stationary seat from the
gland. Discard all O-rings and gaskets.
Figure 6-11
q) If a component type outside mechanical seal is
used, remove the gland and the stationary seat.
Remove the stationary seat from the gland. Loosen
the set screws in the rotating unit and remove it
from the shaft. Discard all O-rings and gaskets.
r) If packing [4130] is used, remove it and the seal cage
[lantern ring, 4134]. Remove the gland [4120].
s) If the pump has a hook type sleeve [2400] it can
now be removed. Unit now appears as shown in
figure 6-12.
Figure 6-12
t) If the power end is oil lubricated, remove the
drain plug [6569.1] and drain the oil from the
bearing housing [3200].
u) If the pump has lip seals, a deflector [2540] will
be present. Remove it.
v) Loosen the three set screws [6570.3] on the
bearing carrier [3240]. The bearing carrier must be
completely unscrewed from the bearing housing.
Do not pry against the shaft.
Mark 3A and ANSI 3A design
The face of the bearing carrier has three square
lugs that protrude from the surface. The bearing
carrier is turned by using an open end wrench on
one of the square lugs as shown in figure 6-13.