Finish Thompson AC 6 & 8 HORIZONTAL SERIES - Manual (Page 2)

Note: Keep the polished surface of the seal face clean. Use a
piece of cardboard to protect the seal while pressing against
the stationary face.
2. Press the stationary seal into the seal seat of the backhead
assembly so that the seal surface points away from the motor
face. Place backhead into motor adapter.
3. Place the spring retainer and seal spring onto the impeller
sleeve.
4. lubricate the inside diameter of the rotating seal component
with P-80 (or equivalent) or soapy water and press it over the
impeller sleeve (item 4) with the rotating face pointed away
from the impeller as shown in figure 2 (towards the stationary
face).
5. Insert key into the motor keyway. Visually determine key loca-
tion in impeller sleeve. align keyway slots on motor shaft and
impeller sleeve. slide impeller assembly over the motor shaft.
lubricate o-ring of new self-sealing bolt (item 6) with suitable,
compatible lubricant. Insert self-sealing bolt into the eye of the
impeller using a 9/16” deep well socket. Insert a screwdriver
into the motor fan to prevent motor shaft from rotating. Tighten
the bolt to 12-ft lbs.
6. Place impeller housing (item 1) over backhead (item 7) and
o-ring (item 3) and make sure discharge is in the correct ori-
entation (usually 12 o’clock).
7. for ac6 pumps – Place the v-clamp (item 2) over the impeller
housing, backhead, and the mounting plate (item 14). Make
sure the discharge is level and in the correct orientation (see
figure 3). Tighten the nut on the v-clamp. firmly tap the v-
clamp with a mallet in several spots, and then retighten the
nut.
for ac8 pumps- Insert the mounting bolts with flat washer
(items 15 &16) through the impeller housing (item 1), the
backhead (item 7), and the mounting plate (item 14), and tighten
with the correct hardware (items 15,17, and 18).
8. rotate the motor fan by hand and check for impeller rubbing.
If the impeller rubs, verify that the self-sealing bolt is properly
installed.
9. reinstall the pump into the system.
Figure 3
Figure 2
2
d. Jog the motor (allow it to run for only one to two seconds)
and observe the rotation of the motor fan. refer to the
directional arrow on the pump if needed.
Note:
a pump running backwards will pump but at a greatly
reduced flow and pressure.
OPEraTIOn
flOODED sUcTIOn sysTEMs:
1. fully open the suction and discharge valves.
2. start the pump and verify liquid is flowing. If there is no liquid flow,
refer to the “Troubleshooting” section of these instructions.
3. adjust the flow rate and pressure by regulating the discharge
valve.
CAUTION: never use the suction valve to adjust the liquid
flow. limiting the suction will result in damage to pump
components.
flUshIng sysTEMs EqUIPPED WITh flUsh ValVEs
1. fully close the suction and discharge valves.
2. connect the water supply to the water inlet valve and connect
a drain hose to water outlet valve.
3. Turn on the water supply and open the inlet and outlet valves.
flush the system until the pump has been cleared of any material
buildup (usually approximately 5 minutes).
4. close the water inlet and outlet valves and turn off water supply.
MaInTEnancE
sEal rEPlacEMEnT DIsassEMBly
1. Disconnect power. remove electrical wiring.
2. close the suction and the discharge valves. Disconnect the
piping. remove any mounting bolts.
3. for ac6 pumps - To remove the v-clamp (item 2) and the impel-
ler housing (item 1), first apply a thread lubricant to the threaded
rod portion of the v-clamp, then remove the nut. remove the
v-clamp, the housing, and the o-ring (item 3).
for ac8 pumps - remove the 8 housing bolts and all the
hardware (items 15,16,17, 18). remove the impeller housing
(item 1) and the o-ring (item 3).
4. Place a screwdriver in the motor fan to prevent rotation and
remove the self-sealing bolt (item 6).
note: Do not reuse the self-sealing bolt.
5. remove impeller (item 4), rotating seal component, seal spring
and seal spring retainer. Discard seal components after removal.
(see figure 2).
6. remove backhead assembly (item 7) and press out the station-
ary seal component. Discard stationary seal component after
removal.
rEassEMBly
1. lubricate the rubber portion of the new stationary seal (item
5) with P-80 (or equivalent) or use soapy water. Do not use
petroleum products to lubricate the rubber.