Finish Thompson PFV - Manual (Page 8)

Inspection
1. Check the housing cover (item 21), the impeller (item 20), and the impeller housing (item 18) for wear, rub-
bing, or damage from foreign objects. Replace if damaged.
Note: The double impeller design of this pump is dependant on the impeller working correctly. Any damage
to the impeller can cause pump failure.
2. Inspect the pump shaft (item 19) for wear in the bottom (item 16), center bearing (item 13) and the FKM lip
seal (item 4) areas. Replace the shaft if needed.
3. Inspect the bottom bearing (item 16), center bearing (item 13), and the bearing guide (item 14) for internal
wear. Inspect all o-rings (items 17,12, & 10) for nicks or chemical attack. Replace as needed.
4. Inspect the bearing assembly (item 3) for rust or corrosion. Never reuse the lip seal.
Reassembly
1. Install new lip seal (item 4) into the pump head with the grooved side facing the bottom of the pump.
2. Thread the shaft (item 19) into the bearing assembly (item 3) with the 3/32 hole in the shaft on the other
end. Carefully insert the shaft straight through the vapor seal (to avoid seal damage) from the top and seat
the bearing assembly (item 3) into the pump head.
3. If o-rings are replaced -- install 2 center bearing o-rings (items 12) in the grooves, then slide the bearing
guide on and then the remaining 2 o-rings. Install 2 upper inner tube o-rings (items 10), and install the im-
peller housing o-ring (item 17) inside the top of the housing. Apply a small amount of Vaseline to the o-rings
to aid in assembly. Assemble the center bearing (item 13) into the upper (item 11) and lower (item 15) inner
tubes.
4. Slide the inner tube assembly up the shaft and into the counter bore in the bottom of the head. Slide the
intake tube up from the bottom, centering the bearing guide, and thread it into the head (left hand thread).
5. Gripping the coupling at the top of the pump, thread the impeller on (right hand thread). Install the housing
cover (left hand thread). Turn the coupling to verify there is no binding inside the pump.
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