MTD
Front-Engine Lawn Tractor

Model #13AL78XT093 (2021) Official MTD t140 lawn tractor

Here are the diagrams and repair parts for MTD 13AL78XT093-2021 t140 lawn tractor, 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.

Showing 10 of 388 parts

Lawn & Garden Equipment Engine Air Filter (replaces BS-793569)#NI

Quick reference/battery/controls Diagram

Filter-air c

Part #BS-793569
Replaced by #793569
?
Manufacturer substitution
This part replaces BS-793569. Substitute parts can look different from the original.
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In Stock
$16.36 | 
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MSRP: $21.04
Lawn & Garden Equipment Engine Oil Filter (replaces 24603, 492932, 691041, 7045184YP, BS-492932S)#NI

Quick reference/battery/controls Diagram

Oil filter

Part #BS-492932S
Replaced by #492932S
?
Manufacturer substitution
This part replaces BS-492932S. Substitute parts can look different from the original.
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In Stock
$12.85 | 
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MSRP: $19.40
Lawn & Garden Equipment Engine Fuel Filter (replaces 2173206, 2173206SM, 394358, 692064, 7014359, 7014359YP, 75213, BS-394358S)#NI

Quick reference/battery/controls Diagram

Fuel filter

Part #BS-394358S
Replaced by #394358S
?
Manufacturer substitution
This part replaces BS-394358S. Substitute parts can look different from the original.
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In Stock
$4.55 | 
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MSRP: $8.63
Lawn & Garden Equipment Cotter Pin, 1/4- to 5/16-in

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Lawn & garden equipment cotter pin, 1/4- to 5/16-in

Part #714-04040
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MSRP: $5.22
Lawn Tractor Blade Engagement Cable (replaces 946-05124)

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In Stock
$18.39 | 
23% OFF 
MSRP: $24.00
Lawn & Garden Equipment Engine Pre-Filter (replaces BS-793685)#NI

Quick reference/battery/controls Diagram

Filter-pre c

Part #BS-793685
Replaced by #793685
?
Manufacturer substitution
This part replaces BS-793685. Substitute parts can look different from the original.
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In Stock
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48% OFF 
MSRP: $8.46
Lawn Tractor 46-in Deck 2-in-1 Blade (replaces 942-04290)

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Lawn tractor 46-in deck 2-in-1 blade (replaces 942-04290)

Part #942-04290A
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MSRP: $30.00
Lawn Tractor Ignition Key (replaces 504-00621, 625-04124, 625-05000, 625-05002, 725-05228, 925-1745, 925-2054A)

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In Stock
$6.76 | 
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MSRP: $9.66
Lawn & Garden Equipment Hex Flange Nut (replaces 753-05549, 912-0417A)#NI

Deck & deck lift Diagram

Lawn & garden equipment hex flange nut (replaces 753-05549, 912-0417a)

Part #712-0417A
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MSRP: $8.90
Lawn & Garden Equipment Engine Exhaust Gasket (replaces 272293, 91309, BS-692236)#NI

Electrical/engine accessories Diagram

Exhaust gasket

Part #BS-692236
Replaced by #692236
?
Manufacturer substitution
This part replaces BS-692236. Substitute parts can look different from the original.
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This item is not returnable
In Stock
$5.03 | 
17% OFF 
Phone Price: $6.03

Symptoms common to all riding mowers & tractors

Choose a symptom to see related riding mower and lawn tractor repairs.

Main causes: punctured tire or inner tube, leaky valve stem, damaged wheel rim
Main causes: worn or broken ground drive belt, bad seat switch, transaxle freewheel control engaged, transaxle failure, dirty carburetor
Main causes: shift lever needs adjustment, neutral control needs adjustment
Main causes: worn or broken blade belt, broken belt idler pulley, blade clutch cable failure, bad PTO switch, damaged mandrel pulleys
Main causes: damaged cutting blade, worn deck pulley, damaged mandrel pulley, loose fasteners on mower deck components
Main causes: engine overfilled with oil, leaky head gasket or sump gasket, damaged carburetor seals, cracked fuel pump, broken fuel line
Main causes: clogged carburetor, damaged flywheel key, dirty spark plug, stale fuel, improper valve lash, engine needs a tune up
Main causes: faulty battery, bad alternator
Main causes: unlevel mower deck, dull or damaged cutting blades, worn mandrel pulleys, bent mower deck, engine needs tune up

Repair guides common to all riding mowers & tractors

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

January 1, 2015
By Lyle Weischwill
How to replace a riding lawn mower rear tire

Your mower can’t run on a damaged rear tire. Here’s how to install a new one.

Repair difficulty
Time required
 60 minutes or less
January 1, 2015
By Lyle Weischwill
How to replace a riding lawn mower blade

If a blade on your mower is dull or bent, replace it following the steps in this repair guide.

Repair difficulty
Time required
 30 minutes or less
January 1, 2015
By Lyle Weischwill
How to replace a riding lawn mower fuel filter

Help your mower run better by replacing the fuel filter during your riding mower's annual tune-up.

Repair difficulty
Time required
 15 minutes or less

Articles and videos common to all riding mowers & tractors

Use the advice and tips in these articles and videos to get the most out of your riding mower or lawn tractor.

August 6, 2020

How to remove a lawn mower blade using a removal tool

By Lyle Weischwill

Learn how a blade removal tool makes replacing the blade easier and safer

April 9, 2019

Riding mower parts and supplies to stock up on video

By Kim Hillegass

Keep these 6 things on hand to keep the mower season running smoothly.

March 1, 2016

Charging a battery in a riding lawn mower video

By Lyle Weischwill

Learn how to use a battery charger if your mower battery is dead.