moyno 20302, Service Manual

Page: 33 / 40

PUMP DISASSEMBLY
WARNING: Before disassembling pump,
disconnect power source and
thoroughly bleed pressure from
system. Failure to do so could result
in electric shock or serious bodily
harm.
1.
Disconnect power source.
2.
Remove suction and discharge piping.
3.
Reducer (9) may be removed from stator (21) by
unscrewing in a counter-clockwise direction (RH
thread).
4.
Remove stator support screws (112B) and
remove top half of stator support(s) (38).
5.
Stator (21) may be removed from suction housing
(2) by unscrewing in a counter-clockwise direction
(RH thread). Use a strap wrench on stator to
avoid crushing with a pipe wrench. Pull stator (21)
from rotor (22). To assist removal of stator, hold
shaft (26) from turning and turn stator clockwise
when facing suction housing after disengaging
thread.
6.
Remove screws (112) holding suction housing (2)
to bearing housing (1). Remove suction housing
and suction housing gasket (83).
7.
The rotor (22) and flexible joint (24) may be
removed using the following procedure (do not
bend joint more than 15 degrees).
a.
Remove rotor (22) from flexible joint (24) by
using a punch to remove rotor pin (46).
Support joint while removing pin.
Note:
On Model 603 only, remove adaptor (264)
from rotor by turning in a counter-clockwise
direction (RH Thread.)
b.
Remove joint (24) from shaft (26) by using a
punch to remove shaft pin (46).
8.
Mechanical Seal Models. Carefully slide
mechanical seal (69) off shaft (26). Carefully pry
seal out of bearing housing (1). If any parts of
mechanical seal are worn out or broken, the
complete assembly should be replaced. Seal
components are matched parts and are not
interchangeable.
9.
Packing Models. Remove bolts attaching
packing gland housing (3) to bearing housing (1)
and remove packing gland housing. Disconnect
drive shaft extension (27) by using a punch to
remove shaft pin
(46).
The packing (42) can be removed without removing
the shaft (27) using the following procedure:
a
. Remove gland bolts (47).
b.
Slide gland (41) away from packing (42).
c.
Pull out packing (42) and lantern ring halves
(57) using a packing-removing tool.
Note:
If shaft (27) has been removed, the packing
can be removed easily by pushing out from
pump side of packing gland housing (3).
10.
The bearings (29 and 30) and shaft (26)
assembly can be removed from bearing housing
(1) after snap ring (66) has been removed. To
remove the shaft assembly, lightly tap the shaft at
the flexible joint connection end using a block of
wood to protect the shaft. The bearings may be
pressed off the shaft.
PUMP ASSEMBLY
1.
Press radial bearing (29) and thrust bearing (30)
on shaft (26), and locate slinger ring (77) on the
shaft near the radial bearing.
Note:
When replacing bearings, always press on the
inner race when assembling to shaft, and on
the outer race when pressing bearings into the
housings.
2.
Press shaft assembly into bearing housing (1)
securing with snap ring (66).
3.
Mechanical Seal Models. Install mechanical seal
(69) using the following procedure:
a.
Clean and oil sealing faces using a clean light
oil (not grease).
Caution: Do not use oil on EPDM parts.
Substitute glycerin or soap and water.
b.
Oil the outer surface of the seal seat, and push
the assembly into the seal bore in the bearing
housing (1), seating it firmly and squarely.
c.
After cleaning and oiling shaft, slide the seal
body along the shaft until it meets the seal
seat.
d.
Install seal spring and spring retainer on shaft.
4.
Packing Models. Install packing before installing
shaft assembly using the following procedure:
a.
Lubricate each individual ring of packing (42)
with a grease that is insoluble in the fluid being
pumped.
b.
Individually assemble each ring of packing
loosely in the stuffing box of the packing gland
housing (3). Seven rings of 1/4” square plus 2
lantern ring halves required—assemble with 3
rings, 2 lantern ring halves (57), followed by 4
rings. Stagger split in rings.
c.
Loosely install packing gland (41) in packing
gland housing (3) using gland bolts (47).
d.
Attach drive shaft extension (27) to drive shaft
(26) by installing pin (46). Support shaft during
installation.
e
. Install slinger ring (77) on drive shaft extension
(27).
f.
Slide packing gland housing (3) on drive shaft
extension, and attach to bearing housing with
bolts (112).
5.
The flexible joint (24) and rotor (22) may be
installed using the following procedure (do not
bend joint more than 15 degrees):
Note:
On model 603 only, pin adaptor (264) to
flexible joint (24) with rotor pin (46), then
thread rotor (22) on adaptor by turning
clockwise (RH Thread.)
a.
Pin flexible joint (24) to shaft (26) using shaft
pin (46).
b.
Pin rotor (22) to joint using rotor pin (46).
Support joint while installing pin.
6.
Secure suction housing gasket (83) and suction
housing (2) to bearing housing (1) using lock
washers (215) and screws (112).
7.
Screw reducer (9) on stator (21) in a clockwise
direction (RH thread).
Note:
Apply pipe “dope” on all pipe threads before
assembly.
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