Sears 390.2521 - Manual (Page 8)

MAINTENANCE
Lubrication
It is not necessary to lubricate the pump or its motor. The
motor bearings are lubricated for life. The mechanical shaft
seal in the pump is water lubricated and self-adjusting.
Draining for Winter
A WARNING Risk of electric shock. Disconnect power
before working on unit.
Pump should be drained whenever it is disconnected from
service or is in danger of freezing.
1. DISCONNECT POWER.
2.
Open faucet and relieve all pressure on system before
proceeding.
3. Disconnect pressure switch tube (Key No. 17, Page 12)
at barbed elbow on pressure switch (Key No. 28) and
allow tube to drain.
4. Open draincock (Key No. 22, Page 12) on pump body
and allow pump to drain.
5- Remove priming plug to vent pump; disconnect hose
(Key No. 6, Page 14) at tank end and drain pressure tank
and all piping to a point below the frost line.
6. Be sure to drain any piping that may be cut off from nor­
mal system drain due to check valve installation.
Vinyl Bag Removal
A WARNING gg sure ALL air pressure has been re­
leased. from tank before removing nuts from flange.
Failure to do this may result in serious or fatal Injury.
Do not attempt to open tank unless all pressure has
been relieved!
AWARNING Risk of electric shock. Disconnect power
before working on unit.
1. DISCONNECT POWER TO PUMP.
2. Drain system as follows:
A. Open faucet closest to tank.
B. Open draincock (Key No. 22, Page 12) on pump
body.
C. Remove hose (Key No. 6, Page 14) from tank flange.
3- ReUeve (expel) ALL air pressure in system by removing
valve core.
4. Disconnect outside piping from tank and pump.
AWARNING To avoid serious or fatal injury, be
sure all air pressure has been released from tank
before proceeding to step 5­
5. Remove nuts and washers from tank inlet flange (Key
No. 2, Page 14). Tap inlet flange to break seal. Remove
flange.
6. Wherever convenient, hold bag with pliers and cut with
single-edge razor blade or sharp knife. Bag wfll not come
out in one piece. Continue pulling and cutting until bag
is removed.
7. Clean and dry inside of tank.
8. Place replacement bag on a clean surface with opening
up. Flatten bag and force air out.
9. Tightly roll bag towards center opening.
10. Before center opening is covered up, force air out of re­
maining portion of bag. Finish rolling bag.
11. To make bag easier to insert into tank, sprinkle outside
of bag with talcum powder.
12. Being careful not to break valve, stand tank on end. Push
tightly rolled bag into tank.
13- Reach into bag and push out sidewalls. You need not
remove all wrinkles.
14. Clean center opening ring on bag and lip on tank.
15. Pull ring on bag through tank opening and fit over tank
Up. BE SURE it seats properly in groove on tank Up.
16. Clean sealing surface of inlet flange and place on studs.
17. NOTICE: Tighten nuts as follows:
A. Hand tighten all nuts.
B. Tighten one nut snug.
C. Tighten opposite nut snug.
D. Proceed, tightening opposite pairs to a snug fit.
E. Recheck aU nuts, using same pattern. Be sure all nuts
are tight and you have a good seal.
NOTICE; Do not overtighten; you may twist studs off of
tank. If you have a torque wrench, tighten to 83 inch-
pounds torque.
18. Stand tank on feet and reconnect piping.
19- Recharge tank to proper air pressure (see Page 5).
20. Reconnect hoses and pressure switch tube; prime pump
(see Page 6).
Air Valve Replacement
1. Follow steps 1 through 5 under “Vinyl Bag Removal”.
2. Cut valve off as close to tank as possible. Push remaining
portion back into tank.
3. Tip tank on end and BE SURE all water is drained from
bag.
4. Carefully remove bag ring from lip on tank opening and
push bag ring back into tank; reach in around it and re­
move cut off portion of valve from tank.
5. Wipe a thin film of soapy solution on replacement valve
and from inside tank insert in hole in top of tank.
6. Pull valve through hole with pliers or a valve tool (avail­
able at your local filling station or Automotive Center).
7. Follow steps 14 through 20 imder “Vinyl Bag Removal”
to reinstall bag in tank.
Testing for Bag Leakage
1. Follow steps 1 through 4 under “Vinyl Bag Removal".
2. Tip tank on end, valve down. Be careful not to break
valve!
3. If bag leaks, water will run out of valve. If so, replace bag
as instructed above.