Finish Thompson AV 6 & 8 Series - Manual (Page 2)

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3. remove the mounting bolts and pull the pump from the tank.
4. For AV6— lubricate the threaded part of the v-clamp (item 29),
and then loosen the v-clamp nut. remove the v-clamp (note
clamp orientation for re-assembly) and the housing/discharge
pipe (items 28, 30, 31 and 32). remove the housing o-ring (item
25).
For AV8 – remove the 8 bolts, washers, and nuts (items 14, 16,
33 and 34), and the housing/discharge pipe (items 28, 30, 31
and 32). remove the housing 0-ring (item 25).
5. gripping the impeller firmly, remove the single bolt and washer
(items 14 and 27) from the middle of the impeller and pull the
impeller (item 26) straight off.
6. remove the 4 screws/washers (items 7 and 8) and remove the
motor mount screen guard (item 3). mark the motor end of the
motor mount for future reference.
7. remove 4 bolts, washers, and lock washers (items 4, 5 and 6)
and separate the motor mount (item 2) from the motor adapter
(item 1). note the mounting plate orientation in comparison to
the motor. You will need to pull the pump straight back to separate
the coupling halves. remove the bolts, washers, & lock washers
(items 15, 14, and 16) and separate the motor mount (item 2)
from the lower bearing mount (item 12).
8. loosen the setscrews and remove the coupling half (item 9) on
the pump shaft (item 23). Accurately measure the distance from
the end of the shaft to the locking collar on the bearing assembly.
make sure to file down any setscrew marks on the shaft.
9. loosen the setscrew on the locking ring (part of item 10) and
find the dimple in the ring. the locking ring is tightened onto the
shaft in a cam style design. Note the mark made in the dimple
when it was tightened and use a drift to drive the ring in the op-
posite direction. remove the locking ring and file the setscrew
mark smooth. slide the pump shaft toward the impeller end of
the pump and remove it.
10. remove the 4 bolts/washers (items 14 and 13) and the bearing
assembly (item 10) from the lower bearing mount (item 12).
remove (note seal orientation) the lip seal (item 11) from the
lower bearing mount and discard.
iNsPeCtioN
1. inspect the bearing assembly (item 10) for corrosion or wear.
2. inspect the pump shaft (item 23) for wear in the lower bushing
area.
3. inspect the lower bushing for unusual wear. (item 24). if any is
detected consult the factory.
reAssemBlY
1. install the lip seal (item 11) into the lower bearing mount (item
12). Note that the open side of the seal faces the motor end.
2. install both the bearing assembly (item 10) and the bolts with
washers (items 13 & 14) but do not tighten the bolts.
3. lubricate (with a chemically compatible lubricant) the inner
diameter of the lip seal, and then gently insert the pump shaft
up through the lower bearing, through the lip seal, and through
the bearing assembly. install the bearing locking ring. Adjust
the pump shaft to the dimension taken before disassembly (step
8), and tighten the locking collar. tighten the setscrew on the
locking collar.
4. install the coupling half (part of item 9) so that the body (not
the 3 prongs) is flush with the end of the shaft and tighten the
setscrews.
5. set motor mount (item 2) onto the lower bearing mount (item
12) and install the bolts and washers (items 14, 15 and 16). Do
not tighten the bolts yet.
6. set the motor carefully on its fan cover with the motor shaft
pointing straight up. Place the motor adapter (item 1) onto the
motor face making sure to align the bolt holes.
7. make sure the coupling insert (part of item 9) is installed in the
motor coupling half. Carefully lower the pump assembly onto
the motor so that the motor shaft goes through the motor mount
(item 2). replace the mounting plate (item 17) in its original
orientation (as noted during disassembly step 7), and guide the
pump shaft coupling half into the motor coupling half. insert
and snug the bolts & washers (items 4, 5 and 6) through the
motor mount (item 2) , the motor adapter (item 1) and into the
motor.
8. grab hold of the couplings (item 9) and spin the shaft several
times. Continue spinning the shaft as you tighten the 4 bolts
(items 13 and 14) on the bearing assembly (item 10). if the
shaft starts to bind, gently tap the bearing assembly in one of
four directions until the shaft spins freely.
9. repeat this process as you tighten the bolts (items 14, 15 and
16) holding the motor mount (item 2) to the lower bearing mount
(item 12), and as you tighten the bolts (items 4, 5 and 6) which
hold the motor mount (item 2).
10. replace the motor mount screen guard (item 3) using the correct
screws and washers (items 7 and 8).
11. reinstall the pump into the system according to the installation
instructions.
mAIntenAnCe
DisAssemBlY
1. Disconnect the power, and remove the electrical wiring.
2. Close the discharge valve, and disconnect the piping.
opeRAtIon
1. Completely open the discharge valve.
2. After verifying the pump housing is flooded, start the pump and
verify the liquid is flowing. if there is no liquid flowing, refer to
the “troubleshooting” section of these instructions.
3. Adjust the flow rate and pressure by regulating the discharge
valve.