Cub Cadet
Gas Walk-Behind Mower

Model # 12A977A100 Official Cub Cadet gas lawn mower

Here are the diagrams and repair parts for Official Cub Cadet 12A977A100 gas lawn mower, as well as links to manuals and error code tables, if available.

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Model diagram and schematic

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ALL PARTS
Showing 10 of 164 parts  |

Blade-21" Mu 742-0741
#85

Deck/wheels/chute/handle diagram

Blade-21" mu

Part #742-0741

Replaced by #942-0741A

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Manufacturer substitution
This part replaces 742-0741. Substitute parts can look different from the original.
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$27.71
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Knob Wing Nut 720-0284
#17

Deck/wheels/chute/handle diagram

Knob wing nut

Part #720-0284

Replaced by #720-04072A

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Manufacturer substitution
This part replaces 720-0284. Substitute parts can look different from the original.
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This item is not returnable
$5.77
48% OFF MSRP : $11.00
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Bell Support 736-0524A
#86

Deck/wheels/chute/handle diagram

Bell support

Part #736-0524A

Replaced by #736-0524B-1

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Manufacturer substitution
This part replaces 736-0524A. Substitute parts can look different from the original.
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$6.11
23% OFF MSRP : $7.90
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Wing Nut 712-0397
#33

Deck/wheels/chute/handle diagram

Wing nut

Part #712-0397

Replaced by #712-0397A

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Manufacturer substitution
This part replaces 712-0397. Substitute parts can look different from the original.
BEST SELLER
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$5.22
16% OFF Phone Price : $6.22
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V-belt 754-0460
#72

Deck/wheels/chute/handle diagram

V-belt

Part #754-0460

Replaced by #954-0460

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Manufacturer substitution
This part replaces 754-0460. Substitute parts can look different from the original.
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$23.49
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Lawn & Garden Equipment Flat Washer 736-0204
#66

Deck/wheels/chute/handle diagram

Lawn & garden equipment flat washer

Part #736-0204

This item is not returnable
$5.43
16% OFF Phone Price : $6.43
In Stock
Lawn & Garden Equipment Hex Cap Screw 710-0751
Lawn & garden equipment hex cap screw

Part #710-0751

This item is not returnable
$5.12
16% OFF Phone Price : $6.12
In Stock
Lawn & Garden Equipment Plastic Plug 721-0325
#43

Transmission/bag diagram

Lawn & garden equipment plastic plug

Part #721-0325

This item is not returnable
$6.75
13% OFF Phone Price : $7.75
In Stock
Lawn & Garden Equipment Hex Bolt (replaces 01000943, 910-1257) 710-1257
#87

Deck/wheels/chute/handle diagram

Lawn & garden equipment hex bolt (replaces 01000943, 910-1257)

Part #710-1257

This item is not returnable
$9.85
9% OFF Phone Price : $10.85
In Stock
Lawn Tractor Screw 710-0642
#57

Transmission/bag diagram

Lawn tractor screw

Part #710-0642

This item is not returnable
$5.68
15% OFF Phone Price : $6.68
In Stock

Symptoms for gas walk-behind mowers

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

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

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

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

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…

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

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 replace a lawn mower spark plug

How to replace a lawn mower spark plug

Take a few minutes to replace the spark plug during your lawn mower's annual tune-up or if the spark plug is burnt or cr…

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

How to replace a lawn mower blade

Check your lawn mower blade regularly and replaced it if it's bent or damaged. …

Repair difficulty
Time required
 15 minutes or less
How to replace a lawn mower flywheel key on a flathead engine

How to replace a lawn mower flywheel key on a flathead engine

When you hit a hard object with your mower, the flywheel can shear to protect more expensive components. Learn how to re…

Repair difficulty
Time required
 45 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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Introducing new technical repair content that we’re developing for the Sears Technical Institute

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