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Troybilt
Gas Walk-Behind Mower

Model # 999 Official Troybilt lawn mower

Here are the diagrams and repair parts for Official Troybilt 999 lawn mower, as well as links to manuals and error code tables, if available.

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  • In the search box below, enter all or part of the part number or the part’s name.

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.

Owner’s manual

Model diagram and schematic

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ALL PARTS
Showing 10 of 176 parts  |
Blade-21" Mu 742-0741
#85

Handle/deck/blade/wheels 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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$29.10 | 
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Bell Support 736-0524A
#86

Handle/deck/blade/wheels 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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$6.58 | 
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Ball Bearing 741-0600
#35

Transmission assembly/bag diagram

Ball bearing

Part #741-0600

Replaced by #941-0600

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Manufacturer substitution
This part replaces 741-0600. Substitute parts can look different from the original.
BEST SELLER
$28.71 | 
17% OFF Phone Price : $34.71
In Stock
Kill Switch 746-0912
#14

Bag frme - e999 diagram

Kill switch

Part #746-0912

Replaced by #946-1130

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Manufacturer substitution
This part replaces 746-0912. Substitute parts can look different from the original.
This item is not returnable
$14.49 | 
12% OFF Phone Price : $16.49
In Stock
Lawn & Garden Equipment Carriage Bolt (replaces 1186069, 583108, 706-101080, 706-10602-12, 791-182213) 710-0703
Lawn & garden equipment carriage bolt (replaces 1186069, 583108, 706-101080, 706-10602-12, 791-182213)

Part #710-0703

This item is not returnable
$6.46 | 
13% OFF Phone Price : $7.46
In Stock
Lawn & Garden Equipment Push Cap (replaces 1917798, 926-0214) 726-0214
#94

Handle/deck/blade/wheels diagram

Lawn & garden equipment push cap (replaces 1917798, 926-0214)

Part #726-0214

This item is not returnable
$15.99 | 
11% OFF Phone Price : $17.99
In Stock
Sears Lawn & Garden Equipment Plastic Plug 721-0325
#43

Transmission assembly/bag diagram

Sears lawn & garden equipment plastic plug

Part #721-0325

This item is not returnable
$6.75 | 
13% OFF Phone Price : $7.75
In Stock
Drive Cable 746-0711A
#11

Handle/deck/blade/wheels diagram

Drive cable

Part #746-0711A

Replaced by #946-0711B

?
Manufacturer substitution
This part replaces 746-0711A. Substitute parts can look different from the original.
$32.85 | 
15% OFF Phone Price : $38.85
In Stock
Hex Nut 712-0267
#38

Bag frme - e999 diagram

Hex nut

Part #712-0267

Replaced by #712-3010

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Manufacturer substitution
This part replaces 712-0267. Substitute parts can look different from the original.
$7.71
In Stock
V-belt 754-0460
#72

Handle/deck/blade/wheels 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.
This item is not returnable

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$23.49 | 
20% OFF Phone Price : $29.49
In Stock

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 run rough?

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

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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 vibrate a lot?

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

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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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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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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…

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Repair difficulty
Time required
 15 minutes or less
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Check your lawn mower blade regularly and replaced it if it's bent or damaged. …

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

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Time required
 45 minutes or less

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