F-1031, Section 4212
Page 41 of 61
Mechanical Seal Installation - Continued
CAUTION
The entire mechanical seal installation procedure shall be completed without interruption. Delays may cause seal bellows to seat improperly.
Whenever a mechanical seal requires replacement, the Waterous Service Department strongly recommends replacing both seals; outboard bearing and drive
end.
Note: Always replace the seal and bearing on outboard end first.
1. Inspect the new primary ring and stationary ring sealing surfaces. These
sur•
faces should be
“mirror smooth” and without scratches. To identify the sta•
tionary ring sealing surface examine the outside diameter of the ring. There
is a chamfer towards the backside and the o-ring is close to the back.
CAUTION
Try not to touch the
“mirror smooth” surfaces. If surfaces are touched
clean surface with denatured alcohol and a soft cloth.
CAUTION
The mechanical seal primary and stationary rings are made of brittle
material. The material can be cracked or chipped. Extra care must be
taken when handling these rings.
2. Sub-Assemble seal chamber cover. See Figure 1. Install a new throttle
bushing in the seal chamber cover. (A throttle bushing is not used on bronze
pumps.) Install new stationary ring with new O-ring in the seal chamber
cov•
er, the mirror smooth seal surface should be visible, the chamfered O.D.
edge should seat on the throttle bushing. Install new seal chamber cover
O-ring gasket in the seal chamber cover.
CAUTION
The throttle bushing must be seated peroperly to avoid misalignment of
the mating surfaces of the mechanical seal.
3. Install seals. See Figures 2 and 3.
a. On the outboard end of the pump, install the installation sleeve on the
shaft which will allow the seal to slip over the shaft shoulder. Failure to use
the installation sleeve may cause damage to the seal. Liberally coat shaft
and sleeve with lubricant (supplied with kit) before installing the
mechani•
cal seal.
b. Place spring retainer and spring on the shaft. Coat inside of mechanical
seal bellows with lubricant and push seal on with installation tool until the
spring retainer makes contact with shaft shoulder. Continue pushing the
seal until the spring is fully compressed. Remove the installation tool
slowly allowing the spring to relax. Remove the protection sleeve from
the shaft (outboard end only).
CAUTION
Do not get lubricant on the sealing surfaces on the stationary ring or
primary ring. If surfaces get lubricant on them clean with a soft cloth and
denatured alcohol.
Note: If Waterous Mechanical Seal Lubricant part no. 52608 is not
available, P80 rubber lubricant, straight dish soap or glycerin may be
substituted.
4. Install seal chamber cover. See Figure 4.
a. Be sure the stationary ring, O-ring, throttle bushing and O-ring gasket
are installed in seal chamber cover (See Step 2).
b. Install the seal chamber cover on the shaft and slowly push on with
installation tool. The seal chamber cover will guide the mechanical seal
into place. When the cover contacts the pump body, attach with the
screws previously removed during disassembly.
Note: Before proceeding, both replacement seals (outboard and drive
end) and the outboard bearing should be installed. As recommended
earlier, both seals should be replaced at the same time. Outboard end
seal and bearing assembly should be completed first.
5. Turn impeller shaft by hand at least two revolutions in both a clockwise and
counterclockwise direction to seat seals.
6. Hydrostatically test pump at 150 P.S.I.G. Observe impeller shaft at throttle
bushing and intersection of the seal chamber cover with pump body split line
for leaks. Turn impeller shaft by hand while retaining the hydrostatic
pres•
sure to see if there is leakage between the throttle bushing and impeller
shaft. If leakage persists, after one or two minutes of rotation (10 to 12 turns)
disassemble and inspect.
