Finish Thompson PF Series Operation-Installation-Parts Manual page 10

3. Remove the impeller housing (item 14) by gripping the intake tube and spinning the housing clockwise
(left hand thread).
4. Place a wooden board or rubber mat on the floor (to protect threads on the bottom of the shaft) and gently
tap shaft (item 14) on it until the bearings (item 3) are exposed at the top of the pump. Pull the bearings and
shaft out through the top of the pump. Shaft can be removed from the bearing sleeve by unthreading it
counterclockwise (right hand thread).
5. Place the pump head (item 6) in a vise (do not crush) and remove the intake tube (item 7) by unthreading
clockwise (left hand thread). Remove the inner tube (item 10) and shaft sleeve (item 8) from the head using a
twist-pull motion.
6. Use a hook tool to remove the lip seal (item 5) from the head.
7. To remove the center support (item 11) from the inner tube (item 10), spread open fingers and disengage it
from the inner tube.
Inspection
1. Check the housing cover (item 16), the impeller (item 15), and the impeller housing (item 14) 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 4) for wear in the bottom (item 12), and the lip seal (item 5) areas. Replace the
shaft if needed.
3. Inspect the bottom bearing (item 12) and the shaft sleeve (item 8) for internal wear. Inspect all o-rings (items
9, 13, & 17) for nicks or chemical attack. Replace as needed.
4. Inspect the bearing assembly (item 3) for rust or corrosion. Never reuse the lip seal (item 5).
Reassembly
1. Install new lip seal (item 5) into the pump head (item 6) with the grooved side facing the bottom of the
pump.
2. Thread the longer threaded end of the shaft (item 4) into the bearing assembly (item 3) and hand tighten.
Carefully insert the shaft from the top through the vapor seal and head (items 5 & 6) and seat the bearing
assembly (item 3) into the head (item 6)
3. If o-rings are replaced: Install 2 upper inner tube o-rings (items 9), and install the impeller housing o-ring
(item 13) inside the top of the housing (item 14). Apply a small amount of Vaseline to the o-rings to aid in
assembly. Install the center support (item 11) onto the inner tube (item 10).
4. Slide the inner tube (item 10) up the shaft and into the counter bore in the bottom of the head. Slide the shaft
sleeve (item 8) up inside the inner tube. Slide the intake tube up from the bottom, centering the center sup-
port, and thread it (left hand thread) into the head (item 6).
5. Gripping the coupling (item 7) 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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