Little Giant
Farming

Model # 581506/3-MDQ-SC Official Little Giant pump

Here are the diagrams and repair parts for Official Little Giant 581506-3-MDQ-SC pump, as well as links to manuals and error code tables, if available.

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Model diagram and schematic

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Showing 10 of 31 parts  |

Volute 180079
#12

Replacement parts diagram

Volute

Part #180079

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

Ceramic Thrust Washer 921077
#9

Replacement parts diagram

Ceramic thrust washer

Part #921077

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

Adapter 180037
#2

Replacement parts diagram

Adapter

Part #180037

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

Magnet 183602
#5B

Replacement parts diagram

Magnet

Part #183602

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

Housing 180004
#7

Replacement parts diagram

Housing

Part #180004

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

Shaft 180059
#6

Replacement parts diagram

Shaft

Part #180059

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

Magnet Assembly 182602
#5A

Replacement parts diagram

Magnet assembly

Part #182602

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

Hex Nut, #8-32 (4) (580507, 581507, 581517, 582507) 920020
#13A

Replacement parts diagram

Hex nut, #8-32 (4) (580507, 581507, 581517, 582507)

Part #920020

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

Pump Magnet Housing 182005
#7A

Replacement parts diagram

Pump magnet housing

Part #182005

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

Volute 181203
#12B

Replacement parts diagram

Volute

Part #181203

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

Symptoms for gas walk-behind mowers

Choose a symptom to see related walk-behind mower repairs.

Main causes: damaged cutting blade, loose cutting blade, damaged flywheel key, engine needs tune up…

Main causes: uneven wheel height settings, damaged wheel, dull or damaged cutting blade…

Main causes: engine needs tune up, dirty or clogged carburetor, damaged flywheel key…

Main causes: drive control cable failure, worn or broken drive belt, bad transmission, broken drive wheel…

Main causes: stale gas, engine needs tune up, bad spark plug, dead battery, bad recoil starter, faulty safety switch, ba…

Main causes: dirty carburetor, bad spark plug, clogged air filter, engine choke problems, clogged gas cap vent…

Repair guides for gas walk-behind mowers

These step-by-step repair guides will help you safely fix what’s broken on your walk-behind lawn mower.

How to rebuild a lawn mower carburetor

How to rebuild a lawn mower carburetor

The carburetor mixes air with fuel to drive the piston. Rebuild the carburetor if it's clogged or leaks.…

Repair difficulty
Time required
 60 minutes or less
How to replace a lawn mower recoil starter on an OHV engine

How to replace a lawn mower recoil starter on an OHV engine

Replace the recoil starter if it doesn't move when you pull the starter rope.…

Repair difficulty
Time required
 15 minutes or less
How to replace a lawn mower wheel

How to replace a lawn mower wheel

Learn how replace a damaged wheel on a walk-behind lawn mower—it's a quick, easy fix.…

Repair difficulty
Time required
 15 minutes or less

Articles and videos for gas walk-behind mowers

Use the advice and tips in these articles and videos to get the most out of your walk-behind lawn mower.

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.…

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.…

Lawn mower won't start troubleshooting video: can't pull recoil pull cord

Lawn mower won't start troubleshooting video: can't pull recoil pull cord

A blade obstruction, bad recoil starter or locked-up engine can prevent the pull cord on your mower from working. See ho…