installation &
operating instructions
Design Envelope
4300
&
4380
Vertical In-line Pumping Unit
29
Do not remove motor collar
(155)
for seal replacement.
c
Remove the mechanical seal rotating assembly
(62)
through the gap between the pump and motor shafts..
d
Disconnect the seal flush piping
(59)
from pump discharge.
Mark seal gland plate
(54)
position. Remove the seal gland
plate bolts and washer (lock washer)
(52,163)
and seal
gland plate
(54)
. Remove the stationary seat
(61)
and seat
gaskets
(55)
.
Seal replacement
Handle mechanical seal carefully to protect seal faces from
damage. Do not contaminate seal faces with finger prints
e
Replace the stationary seat
(61)
and gaskets
(55)
from
mechanical seal package, aligning the seat flush hole with
the seal gland plate flush line connection. Ensure the large
diameter gasket is on the bottom. Replace seal gland plate
(54)
and tighten the seal gland plate bolts
(52,163)
evenly
and diagonally to
5
(ft. lbs) for
0.75"
seal size.
f
When installing the mechanical seal
(62)
, ensure parts are
perfectly clean.
g
Apply a small amount of temporary rubber lubricant emul-
sion to the O-ring
(62b)
. Carefully slide the mechanical seal
rotating assembly
(62)
down the shaft onto the stationary
seat
(61)
. Do not tighten the set screws
(62a)
on the side
of the mechanical seal yet. Do not remove holding clips
(62c)
.
If motor is replaced:
Loosen set screws
(56)
on motor shaft
collar
(155)
and remove from old motor shaft. To position the
collar
(155)
correctly on the new motor shaft, temporarily fit
motor shaft collar
(155)
into groove of the keyed coupling half.
Slide collar, with coupling half onto new motor shaft until end of
shaft lines up with line scored into coupling. Tighten the visible
set screws
(156)
in the collar
(155)
enough to hold the collar
in place on the shaft and remove the coupling half. Tighten all
collar set screws
(156)
evenly and diagonally.
h
Fit the motor shaft key
(05)
and the pump shaft key
(149)
then install the keyed coupling half
(140)
first.
note:
For easier coupling installation, motor and pump shaft keys
(05
& 149)
should be
180
degrees from the working area. To auto-
matically locate the impeller in the pump, insert the coupling
screw Allan wrench into positioning hole
(21a)
and lift pump
shaft until the pump shaft collar is positioned in the coupling
groove, then rotate shaft to locate the pump shaft key
(149)
into blind keyway in coupling.
i
Place the second coupling half into position and tighten the
coupling screws
(144,145)
following the tightening pattern
shown on the illustration
(1-2-3-4)
.
note:
Snug fit the coupling screws and confirm even gap spacing
between coupling halves, then firmly tighten coupling screws
following the tightening pattern illustrated. Then push (or slide)
mechanical seal
(62)
firmly onto the stationary seat
(61)
and
tighten the set screws
(62A)
by a torque wrench to
5
(ft. lbs).
The mechanical seal is now pre-set at the correct working
length.
j
Replace the seal flush piping
(59)
and drain plug(s). Open
all isolating valves prior to operating pump(s). Reconnect
power supply.
6.3.2
mechanical seal replacement instructions
for close-coupled pumping units (series 4380
& 4372)
80
101
86
83
16
36
35
94
21
40
10
43
44
59
62
102
100
61
The close-coupled or motor mounted type Vertical In-Line
pumps use vertical shaft-down ball bearing motors (integrated
motors and drives). Each pump and motor unit is pipe mounted
and as such relies on the piping only for support. The piping
support is designed for the weight of the piping, liquid, pump
and motor and other pipe fittings. The pumping unit should not
be independently secured to the building structure. If the pump
is mounted separately to any structure, the pump must be iso-
lated from the piping with flexible piping connections. For units
Summary of Contents for Design Envelope 4300
Page 2: ......
