Craftsman 390.252156, Owner'S Manual

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MAINTENANCE
NOTICE:
Do not overtighten; you may twist studs
off of tank. If you have a torque wrench, tighten to
85 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”, Page 7.
2. Cut valve off as close to tank as possible. Push re-
maining 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 remove 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
(available at your local filling station or Automotive
Center).
7. Follow steps 14 through 20 under “Vinyl Bag Re-
moval”, Page 7, to reinstall bag in tank.
Testing for Bag Leakage
1. Follow steps 1 through 4 under “Vinyl Bag
Removal”, Page 7.
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, re-
place bag as instructed above.
DISASSEMBLY AND
ASSEMBLY OF PUMP
Risk of electric shock. Ground unit
and disconnect power before attempting any
work on pump or motor.
Your Sears pump is designed for ease in servicing.
Should repair or replacement of the motor or seal be
needed, the pump and piping do not need to be dis-
connected or disturbed.
1. Disassemble pump as follows:
A. Disconnect power.
B. Drain pump by opening drain cock. Remove
pressure switch tubing from fitting on top of
pump.
To avoid serious injury, release all
pressure from system before attempting to re-
move clamp from pump.
C. Remove clamp, Key No. 10, Page 12.
D. Remove pump base mounting bolts. Motor as-
sembly and back half assembly of pump can be
pulled away from front half.
E. Remove “O” rings.
2. Reassembly of pump.
A. Clean “O” rings and “O” ring grooves.
B. Lubricate “O” rings with petroleum jelly, and
place in grooves.
C. Slide pump halves together.
D. Clean inside of clamp. Place clamp around pump
halves. Alternately tighten clamp screw and tap
clamp around outside with plastic mallet. This
will insure proper seating of “O” ring and clamp.
E. Assemble base mounting bolts. Connect pres-
sure switch tubing and close drain cock.
F. Prime pump and turn on power.
G. Check for leaks.
Removing Motor for Service
and Replacing Shaft Seal
If it is necessary to separate motor and seal plate, al-
ways replace the shaft seal. We suggest you purchase
this item, Stock No. 2784, and have it on hand for fu-
ture use.
NOTICE: The seal consists of two parts, a rotating
member and a ceramic seat. The surfaces of the seal
are easily damaged. Read instructions carefully.
1. Disassemble pump per instructions above.
2. Remove diffuser and impeller as follows (Key Nos.
8 and 9, Page 12).
A. Remove screws holding diffuser.
B. Loosen two screws and remove motor canopy
from motor.
C. Place 7/16” open end wrench on motor shaft flat.
D. Turn impeller counterclockwise when facing it.
8
475 0194
Figure 5