If the pump is a RWA4206, remove the “mechanical seal sta-
tionary O ring” from the inside of the mechanical seal gland
(13) and inspect the anti-rotation pin (375). If the pin needs to
be replaced, pull it from the gland with a pair of pliers.
i) Remove the grease seal (76) from the seal gland (13). This can
be removed by inserting a small drive pin punch into the open
side of the seal and driving it out of the seal gland.
j) If the pump is a RWA2096, remove the snap ring (75A) from
the pump shaft (29). If the pump is a RWA4166 or a
RWA4206, bend the tab of the bearing lock washer (31A) out
of the slot in the bearing lock nut (31). Remove the bearing
lock nut and the bearing lock washer from the pump shaft (29).
Press the thrust bearing(s) (25A) from the pump shaft. Exercise
care to push only on the inner race of the bearings. Do not
press on the shaft snap ring (75) of the RWA4166. Do not
hammer on the bearing(s) or the shaft in any manner as this
may result in damage to the shaft. Remove the snap ring (75)
from the pump shaft of the RWA4166, only if it is damaged.
k) Press or drive the bearing cartridge (180) from the bearing
housing (26).
1) RWA2096 procedure:
Use a 1
1/4
” diameter bar, 12” long, cut square on the
ends. Insert the bar into the coupling end of the bearing
housing (26) until it stops against the bearing cartridge
(180). Use a hydraulic press to press the bearing cartridge
(180) from the bearing housing (26).
2) RWA4166 procedure:
The bearing cartridge (180) has two
3/8
” - 16 UNC tapped
holes that are acceptable from the impeller end of the
bearing housing. Securely bolt a
1/2
” Class 300 flange to
the cartridge, using washers on the bolts. Use a 14” long
piece of 1” pipe (1
5/16
” ” outside diameter), cut square on
the ends, to reach down through the bearing housing (26
to press the bearing cartridge out.
3) RWA4206 procedure:
The bearing cartridge (180) has two
1/2
” - 13 UNC tapped
holes that are accessible from the impeller end of the
bearing housing. Securely bolt a 1” Class 300 flange to
the cartridge, using washers on the bolts. Use a 22” long
piece of 1
1/4
” pipe (1
5/8
” outside diameter), cut square on
the ends, to reach down through the bearing housing (26)
to press the bearing cartridge out.
l) If there is any reason to remove the bearing housing foot (9),
it is secured by two bolts and located by a dowel pin.
REASSEMBLY PROCEDURE
WARNING:
Use only high quality tools.
Wear protective equipment as advised at the beginning of this
section.
Use mechanical lifting equipment to lift assemblies and
components.
Do not hammer on any parts. Personal injury and/or damage to
equipment may occur.
Do not attempt to manufacture parts or modify Dean Pump parts in
any manner. Death, personal injury, and/or damage to
equipment may occur.
Replace all gaskets, seals, bearings, and lubricants. Replace all
parts that have worn, corroded, eroded, or otherwise deteriorated.
Use only Dean Pump Division of Met-Pro Corporation parts.
To reassemble the pump, perform the following steps:
a) Clean all parts, thoroughly inspect them, and replace where
necessary. If the pump shaft (29) has two lip contact wear pat-
terns (lip seal contact area) under the lip seal (76), replace the
shaft. If the shaft is scored under the bearing (180), replace the
shaft.
b) Press a new bearing cartridge (180) into the bearing housing
(26) until it seats firmly against the shoulder in the bearing hous-
ing. On the RWA2096 pump, install with the exposed carbon
bearing face facing outward (see the sectional assembly draw-
ing). On the RWA4166 and RWA4206 pumps, install with the
two tapped holes facing outward and the
1/8
” diameter
“through hole” positioned at the top of the bearing housing
(see the sectional assembly drawing). Use a press and a pad
over the end of the bearing cartridge. Do not hammer on the
bearing cartridge; the bearing could be broken. If a press is
not available, the bearing cartridge could be pulled into the
bearing housing by using a piece of threaded rod through the
bearing housing with a large washer and a nut on each end.
c) If the pump is a RWA4166, install the snap ring (75) into
the pump shaft (29), insuring that it is securely into the snap
ring groove.
d) If you are reinstalling a previously used pump shaft (29),
inspect it for wear under the grease seal(s) as directed in para-
graphs g) and p) below. Also remove any scratches or burrs.
Press the thrust bearing(s) (25A) onto the pump shaft (29).
1) RWA2096 procedure:
Press the thrust bearing (25A) onto the pump shaft (29) and
firmly against the shaft shoulder. Do not hammer on the
bearing or shaft in any manner as this will cause damage.
2) RWA4166 procedure:
Press the thrust bearings (25A) onto the pump shaft (29) and
firmly against the snap ring (75). The thrust bearings are
angular-contact type, ground specifically for duplex
mounting and must be assembled back-to-back (see the
illustration below). Note the direction that the races of the
bearing are mounted. Do not hammer on the bearings or
shaft in any manner as this will cause damage.
3) RWA4206 procedure:
Press the thrust bearings (25A) onto the pump shaft (29) and
firmly against the shaft shoulder. The thrust bearings are
angular-contact type, ground specifically for duplex
mounting and must be assembled back-to-back (see the
illustration below). Note the direction that the races of the
bearing are mounted. Do not hammer on the bearings or
shaft in any manner as this will cause damage.
T
HRUST
B
EARING
P
OSITION
– RWA4166 & RWA4206
14
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