6.3
Mechanical Seal Replacement - SS5500, SS8500, SS12500, SS23000, and
SS24000 Series Pumps
STEPS
1.
Remove the liquid end assembly (Section 6.2, Removal and Installation
of Liquid End Assembly).
2.
Remove the pump shaft key and slide the mechanical seal holder off
the pump shaft (Figure 6.9, Removal of Mechanical Seal).
3.
Remove the rotary portion (spring, washer, and face assembly) of the
seal assembly from the pump shaft by rotating and pulling the rotary
portion until it slides off the pump shaft. If prying is required, do not
damage the pump shaft or inlet housing where the seal holder seals
(Figure 6.9, Removal of Mechanical Seal).
Figure 6.9
Removal of Mechanical Seal
4.
When installing a new mechanical seal, do not cut the rubber bellows
when sliding the seal over the shaft key way. One method is to wrap
thin plastic tape over the shaft key way to protect the rubber bellows
from damage. Wrap 1-1/4 turns to cover the end of the key way
opposite the shaft end. With some overlap, wrap a second 1-1/4
turns, etc., until complete key way is covered.
5.
Lubricate the round surface of the pump shaft with oil, petroleum
grease or silicone grease. After lubrication, install the rotary portion
of the new seal by placing it onto the pump shaft and carefully
rotating and pushing the rotary portion down the pump shaft until it is
lightly seated against the spring. Remove the tape.
6.
Remove the stationary portion of the old mechanical seal from the
cavity in the seal holder (Figure 6.9).
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