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UST
Water Pump

Model # WP255 Official UST pump

Here are the diagrams and repair parts for Official UST WP255 pump, as well as links to manuals and error code tables, if available.

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Owner’s manual
Error Codes

Model diagram and schematic

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Showing 10 of 185 parts  |
Guide QJWB.08.01-03
#10

Recoil starter assembly diagram

Guide

Part #QJWB.08.01-03

The manufacturer no longer makes this part, and there's no substitute part

Jacket QJWB.10.03-03
#11

Fuel tank diagram

Jacket

Part #QJWB.10.03-03

The manufacturer no longer makes this part, and there's no substitute part

Key QJWB.04-04
#9

Brance & flying wheel diagram

Key

Part #QJWB.04-04

The manufacturer no longer makes this part, and there's no substitute part

Rod, Connecting (2) QJWB.03-02
#9

Intake & exhaust valve assembly diagram

Rod, connecting (2)

Part #QJWB.03-02

The manufacturer no longer makes this part, and there's no substitute part

Seat Bolt QJWB.06.02.01-03
#27

Centrifugal adjustment governor diagram

Seat bolt

Part #QJWB.06.02.01-03

The manufacturer no longer makes this part, and there's no substitute part

Arm (2) QJWB.03-06
#3

Intake & exhaust valve assembly diagram

Arm (2)

Part #QJWB.03-06

The manufacturer no longer makes this part, and there's no substitute part

Rivet 2 QJWB.03.01-03
#21

Intake & exhaust valve assembly diagram

Rivet 2

Part #QJWB.03.01-03

The manufacturer no longer makes this part, and there's no substitute part

Cover, Supply Oil Mouth QJWB.01-07
#5

Crankcase diagram

Cover, supply oil mouth

Part #QJWB.01-07

The manufacturer no longer makes this part, and there's no substitute part

Washer 2, Stopper QJWB.14.01-04
#6

Water pump diagram

Washer 2, stopper

Part #QJWB.14.01-04

The manufacturer no longer makes this part, and there's no substitute part

Circlip, Piston Pin (2) QJWB.05-05
#10

Piston & connecting rod diagram

Circlip, piston pin (2)

Part #QJWB.05-05

The manufacturer no longer makes this part, and there's no substitute part

Symptoms for water softeners

Choose a symptom to see related water softener repairs.

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Why isn't my water softener using salt?

Main causes: salt bridge inside the salt tank, bad timer, valve motor failure, faulty rotor valve, clogged venturi…

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Why is there no display on my water softener?

Main causes: lack of electrical power, bad power transformer, faulty timer…

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Why does my water softener overflow?

Main causes: faulty brine valve assembly, bad rotor valve…

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Why does my water softener leak water?

Main causes: loose water line connections, cracked water-carrying components, bad rotor valve seals…

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Why are water softener resin beads in my water?

Main causes: broken resin tank screen, bad resin tank seals, cracked upper distributor in resin tank…

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Why is my softened water salty?

Main causes: clogged drain hose, faulty rotor valve, leaky rotor valve seals…

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Why isn't my water softener softening my water?

Main causes: empty salt tank, salt bridge, depleted resin, clogged or damaged venturi, broken rotor position switch, fai…

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Why isn't my water softener meter working?

Main causes: broken water flow meter, faulty timer, water flow to softener is bypassed…

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Repair guides for water softeners

These step-by-step repair guides will help you safely fix what’s broken on your water softener.

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How to replace a water softener rotor position switch

How to replace a water softener rotor position switch

The rotor position switch detects the position of the valve rotor. If the rotor position switch fails, follow these step…

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Repair difficulty
Time required
 30 minutes or less
How to replace a water softener timer

How to replace a water softener timer

The timer is the control board you use to program the water softener. If the timer isn’t accepting commands when you pus…

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Repair difficulty
Time required
 15 minutes or less
How to replace a water softener venturi

How to replace a water softener venturi

The venturi valve in your water softener draws brine water from the salt tank to the resin tank for regeneration. Follow…

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Repair difficulty
Time required
 15 minutes or less

Articles and videos for water softeners

Use the advice and tips in these articles and videos to get the most out of your water softener.

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How to enjoy all the online benefits we offer on our Sears PartsDirect website

How to enjoy all the online benefits we offer on our Sears PartsDirect website

Learn about all the convenient features on our Sears PartsDirect website that make your parts purchases easier.…

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Top questions about Sears and Sears PartsDirect

Top questions about Sears and Sears PartsDirect

Get answers to frequently asked questions about Sears and Sears PartsDirect.…

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How to use a multimeter to test electrical parts video

How to use a multimeter to test electrical parts video

Learn how to use a multimeter to check for wiring problems in an appliance that's not working…

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