e) Secure the thrust bearing(s) (25A) to the pump shaft (29).
1) RWA2096 procedure:
Install the bearing retaining snap ring (75A) with the tapered
side away from the bearing (see the illustration below).
2) RWA4166 and RWA4206 procedure:
Install a new bearing lock nut washer (31A). Install the
bearing lock nut (31). Bend a tab of the bearing lock nut
washer (31A) into an aligned slot of the bearing lock
nut (31).
f) Thrust bearing lubrication:
1) RWA2096 procedure:
The thrust bearing (25A) of the RWA2096 is already
packed with grease and is sealed for life.
2) RWA4166 and RWA4206 procedure:
Pack the thrust bearings (25A) with grease.
The RWA4166 requires 2.9 cubic inches of grease.
The RWA4206 requires 6.8 cubic inches of grease.
Attempt to force all of the grease into the bearings.
The grease must be a lithium 12-hydroxysterate soap
thickened grease that has rust inhibitors and extreme
pressure additives and must be a NGL1, Grade 2, similar to:
Shell Oil Company’s “Alvania” Grease #EP
or
Union Oil of California’s “UNOBA #2” Grease Grade 2
Grease is also available from Dean Pump in individual
containers. Order “RA3000 Grease #2 for bearing
lubrication”. One container is required for each
RWA4166 pump. Two containers are required for each
RWA4206 pump.
g) Press a new grease seal (76) into the mechanical seal gland
(13). Remove and discard the garder spring from a new
grease seal (76). Install with the lip pointing towards the
impeller end of the pump as shown in the pump sectional
assembly drawing.
Inspect the shaft (29) when installing a used shaft (if the shaft
has been used before): determine if there is one or two grease
seal lip contact wear patterns (grease seal lip contact area).
If two contact areas are present, the pump shaft needs
replacing. If one contact area is present, stop pressing on the
seal when the outside face of the seal is
1/16
” above the face
of the mechanical seal gland (13). If the pump shaft (29) is
new, press the seal into the mechanical seal gland (13) until it
is flush with the face of the mechanical seal gland.
If the pump is a RWA4206, and if the anti-rotation pin (375)
was removed, press a new anti-rotation pin into the seal gland
(13). The pin must be installed so that it protrudes from
3/32
” to
1/8
” from the face of the gland.
h) Install new seal gland gaskets (325) into the mechanical seal
gland (13). Lubricate the gaskets before installing, with a
Rubber Lubricant Emulsion (temporary lubricating agent). One
such product is “P-80”, which is available from International
Products Corp.
i) Install a new mechanical seal stationary seat (95A) into the
mechanical seal gland (13). If the pump is a RWA2096 or a
RWA4166, be sure that there is an “O” ring installed in the
groove in the outside diameter of the mechanical seal stationary
seat (95A). If the pump is a RWA4206, install the stationary
seat “O” ring (the “O” ring is furnished with the mechanical seal
stationary seat) into the groove in the bore of the mechanical
seal gland (13). Install the mechanical seal stationary seat (95A)
with the polished face away from the lip seal (76). Lubricate the
“O” ring before installing the mechanical seal stationary seat
into the groove in the bore of the mechanical seal gland (13).
Install the mechanical seal stationary seat (95A) into the seal
gland (13). Use the same Rubber Lubricant Emulsion used in
h) above.
If the pump is a RWA4206, align the slot in the seal stationary
seat (95A) with the anti-rotation pin (375) in the seal gland (13)
as you are installing the stationary seat.
j) Lubricate the lip of the lip seal (76) and the area of the pump
shaft (29) on which the lip seal will operate. Use the same
grease that was used to pack the bearings (25A). Carefully slide
the mechanical seal gland (13) assembly over the pump shaft,
so as not to damage the lip seal nor the mechanical seal
stationary (95A). Push the mechanical seal gland snugly against
the thrust bearing (25A).
k) If the pump is a RWA2096, go to step l). If the pump is a
RWA4166 or a RWA4206, lubricate the area of the shaft
sleeve (10), onto which the mechanical seal rotary (95B)
mounts, with the same Rubber Lubricant Emulsion used in h)
above. Carefully slide the mechanical seal rotary onto the sleeve
and firmly against the shoulder of the sleeve. Tighten the set
screws of the mechanical seal rotary onto the shaft sleeve.
Lubricate a new shaft sleeve gasket (O ring) (77A) with the same
lubricant, and install it into the sleeve.
l) Clean any grease from the pump shaft (29) that is there from the
seal gland (13) installation of step j).
1) RWA2096 procedure:
Lubricate the inside of the mechanical seal rotary (95B) and
the area of the pump shaft (29) over which the rotary will
slide. Use the same Rubber Lubricant Emulsion as in step
h) above.
Carefully slide the mechanical seal rotary (95B) over the
pump shaft (29) until it contacts the mechanical seal
stationary (95A). Do not damage the seal on any of the
shaft shoulders. Use a 9” to 11” piece of 1” PVC, schedule
40 pipe, with its ends cut square, to push against the seal
rotary (95B). This will allow you to push the rotary (com
pressing the springs of the mechanical seal rotary (95B))
firmly against the shoulder of the pump shaft. Hold the rotary
against the shaft shoulder and tighten the set screws that are
in the mechanical seal rotary (95B) against the pump shaft.
15
S
NAP
R
ING
O
RIENTATION
– RWA2096
