V1.4
16 of 22 04/01/2009
Model CK1B
Seal Replacement
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Remove the cover, idler assembly and cover gaskets.
•
Place the pump, cover side down, on blocks set wide enough apart so that the
rotor will clear when pressed out.
•
Remove the screws from the bearing housing and pull it off. The inner bearing
sleeve will remain pressed onto the rotor shaft.
•
Press out the rotor from the shaft end. The inner bearing sleeve will pop off.
•
Remove the seal from the rotor shaft.
•
Remove the housing plug.
•
Remove the stationary seat from the bearing housing.
•
Inspect the rotor for scratches, burrs or gouges. Removal of the inner bearing
sleeve will frequently score the rotor shaft, necessitating replacement of the rotor.
•
Inspect all internal parts for wear or damage. Replace any parts as needed.
•
To reassemble the pump, first slide the washer and ball bearing over the rotor
shaft.
•
Replace the shims in the housing, using the same thickness as before.
•
This step is extremely important.
Insert the rotor with the washer and ball
bearing into the housing. The shims should allow enough clearance so that the
rotor will turn freely. The face of the housing should be even with the ends of the
rotor teeth when gently pressed. If there is not enough clearance the rotor will not
turn freely, causing severe scoring. There cannot be any metal-to-metal contact
between the rotor and the housing.
•
Replace the cover gaskets, idler assembly and cover.
•
Lay the pump on the cover end. Replace the washer over the ball bearing on the
rotor shaft.
•
Apply a dab of petroleum jelly over the rotor shaft. (If the seal is EPR, apply a
silicon-based lubricant).
•
Slide the replacement mechanical seal over the shaft and down until it seats
against the retaining ring.
•
With the smooth face up, press the stationary seat into the bearing housing.
•
Install the new lip seal into the housing plug.
•
Slide the housing plug assembly over the shaft and press it into place.
•
Replace the inner sleeve from the roller bearing. Press over the rotor shaft until it
is flush with the seal on the housing plug.
•
Replace the bearing housing (still containing the roller bearing) on the rotor shaft.
•
Test the pump by turning by hand. Use a small wrench on the shaft over the flat.
The pump will turn with some drag from seal tension, but there should be no
binding or high spots.
