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Poulan
Gas Walk-Behind Mower

Model # PO4QN20SC Official Poulan rotary lawn mower

Here are the diagrams and repair parts for Official Poulan PO4QN20SC rotary lawn mower, as well as links to manuals and error code tables, if available.

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Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

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For DIY troubleshooting advice and repair guides, visit our repair help section.

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Model diagram and schematic

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ALL PARTS
Showing 10 of 30 parts  |
Lawn Mower Blade Adapter 850977
#53

Engine/housing/handle/wheels diagram

Lawn mower blade adapter

Part #850977

Replaced by #581547901

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Manufacturer substitution
This part replaces 850977. Substitute parts can look different from the original.
BEST SELLER
$18.44 | 
10% OFF Phone Price : $20.44
In Stock
Rope Guide 179585
#2

Engine/housing/handle/wheels diagram

Rope guide

Part #179585

Replaced by #586122501

?
Manufacturer substitution
This part replaces 179585. Substitute parts can look different from the original.
This item is not returnable
$15.59 | 
11% OFF Phone Price : $17.59
In Stock
Spring 700331X004
#31

Engine/housing/handle/wheels diagram

Spring

Part #700331X004

Replaced by #532401621

?
Manufacturer substitution
This part replaces 700331X004. Substitute parts can look different from the original.
$8.54
In Stock
Deflector 88602
#21

Engine/housing/handle/wheels diagram

Deflector

Part #88602

Replaced by #532088602

?
Manufacturer substitution
This part replaces 88602. Substitute parts can look different from the original.
This item is not returnable
$6.83
In Stock
Lawn & Garden Equipment Washer (replaces 532851074, 5328510-74) 851074
#51

Engine/housing/handle/wheels diagram

Lawn & garden equipment washer (replaces 532851074, 5328510-74)

Part #851074

Replaced by #532851074

?
Manufacturer substitution
This part replaces 851074. Substitute parts can look different from the original.
This item is not returnable
$6.83
In Stock
Screw, 5/16-in 149741
#41

Engine/housing/handle/wheels diagram

Screw, 5/16-in

Part #149741

Replaced by #532171877

?
Manufacturer substitution
This part replaces 149741. Substitute parts can look different from the original.
$8.54
In Stock
American Yard Products Lawn Mower 20-in Deck Blade (replaces 129277, 134871, 145106cs, 145106ms, 145106wa, 145106x431, 146749, 146749wa, 33255, 532129277, 5321608-37, 5327009-72, 532751646, 700972, 701211wa, 751646, 850972, 850972wa) 145106
#52

Engine/housing/handle/wheels diagram

American yard products lawn mower 20-in deck blade (replaces 129277, 134871, 145106cs, 145106ms, 145106wa, 145106x431, 146749, 146749wa, 33255, 532129277, 5321608-37, 5327009-72, 532751646, 700972, 701211wa, 751646, 850972, 850972wa)

Part #145106

Replaced by #532145106

?
Manufacturer substitution
This part replaces 145106. Substitute parts can look different from the original.
$28.46
In Stock
Washer 62335
#34

Engine/housing/handle/wheels diagram

Washer

Part #62335

Replaced by #532062335

?
Manufacturer substitution
This part replaces 62335. Substitute parts can look different from the original.
$13.69
In Stock
Weed Eater Baffle 700839X479
#55

Engine/housing/handle/wheels diagram

Weed eater baffle

Part #700839X479

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

Decal 85463
#42

Engine/housing/handle/wheels diagram

Decal

Part #85463

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.

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Why does my lawn mower vibrate a lot?

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

Read more

Why does my lawn mower cut unevenly?

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

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Why does my lawn mower run rough?

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

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Why won't my lawn mower move?

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

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Why won't my lawn mower start?

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

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Why does my lawn mower stall?

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

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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.

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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.…

Read more
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.…

Read more
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.…

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Repair difficulty
Time required
 15 minutes or less

Effective articles & videos to help repair your walk-behind mowers

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

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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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Types of walk-behind mower blades video

Types of walk-behind mower blades video

Learn about the different kinds of mower blades and how to maintain them.…

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