Service, Matntaining your pump – Craftsman 390.251883 User Manual

Page 7

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SERVICE

MAtNTAINING YOUR PUMP

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

When the pump is to be disconnected from service, or is in dan­

ger of freezing, it must be drained. The pump has a draincock

which must be opened. Remove the priming plug to vent the
pump. Drain the pressure tank. Drain all piping to a point below

the feezing line.

To drain an air volume control (AVC), remove the tubing. Turn the
AVC upside down. This will permit any water to drain into tank.

Disassembly and Assembly of Pump

The Hydroglass® Pump is designed for case in servicing and main­
tenance.

1. Disassemble pump as follows:

A Disconnect power.

B.

Op>en faucet to relieve pressure.

C. Drain pump by opening draincock. Remove pressure switch

tubing ftom fitting on top of pump.

D. Remove clamp, Key No. 10, Page 11.

E.

Remove pump base mounting bolts. Motor assembly and

back half assembly of pump can be pulled away from front
half.

F. Remove O-Rings.

2. Reassembly of pump.

A. Clean O-Rings and O-Ring grooves.

B.

Lubricate O-Rings with petroleum jeUy, 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 out­
side with plastic mallet. This will insure proper seating of O­

; Ring and clamp.

E.

Assemble base mounting bolts. Connect pressure switch tub­

ing and close draincock.

F.

Prime pump and turn on power.

REMOVING MOTOR FOR SERVICE AND
REPLACING SHAFT SEAL

If it is necessary to remove motor, always replace the shaft seal. We

suggest you purchase this item, U109-6A, and have it on hand for
future use.
NOTICE: The seal consists of two parts, a rotating member and a
ceramic seat. The surfaces of the sea! arc easily damaged. Read in­

structions carefully.

Remove motor as follows:

1. Disassemble pump per instructions above.

2. Remove diffuser and impeller as follows (Key Nos. 7 and 8, Page

IT).

A. Remove screws holding diffuser,

B. Loosen two screws and remove motor canopy.

C. If motor has capacitor, partially unscrew capacitor clamp and

move c:apacitor to one side. -

Risk of electrical shock. Do not touch ca­

pacitor terminals with body or any metal object.

D: Hold motor shaft with a 7/16” wrench on the shaft flats.
E. Turn impeller counterclockwise when facing it.

3. Remove pump back half from motor by unscrewing four (4)

nuts. Pry back half off motor by inserting two (2) screwdrivers
between the back pump half and the motor flange. This will
force rotating portion of seal off shaft. See Figure 8.

FIGURE 8

4

.

Place back half of pump on flat surface and tap out ceramic seat.

Sec Figure: 9.

FIGURE 9

5. Clean seal cavity.
6. Install new seal.

A, Clean polished surface of ceramic seat with clean cloth.

B. Wet outer edge of O-Ring with detergent solution.

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