MTD
Riding Mowers & Tractors

Model # 13A878XT299 Official MTD lawn tractor

Here are the diagrams and repair parts for Official MTD 13A878XT299 lawn tractor, as well as links to manuals and error code tables, if available.

There are a couple of ways to find the part or diagram you need:

  • Click a diagram to see the parts shown on that diagram.
  • 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”.

We encourage you to save the model to your profile, so it’s easy to access parts and manuals for your appliance whenever you log in.

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

Model diagram and schematic

SEARCH WITHIN THIS MODEL

?

This is the number corresponding to the part on the diagram / schematic

Search
ALL PARTS
Showing 10 of 319 parts  |

Lawn Tractor Blade Engagement Cable (replaces 946-05124) 946-05124A
#22

Frame/battery diagram

Lawn tractor blade engagement cable (replaces 946-05124)

Part #946-05124A

BEST SELLER
$32.60
13% OFF Phone Price : $37.60
In Stock
Lawn Tractor Blade Drive Belt, 1/2 X 103-1/16-in 954-04219
#51

Mower deck/spindle pulley diagram

Lawn tractor blade drive belt, 1/2 x 103-1/16-in

Part #954-04219

Replaced by #490-501-M009

?
Manufacturer substitution
This part replaces 954-04219. Substitute parts can look different from the original.
BEST SELLER

Get free shipping with Automatic Reorder

$33.81
13% OFF Phone Price : $38.81
Back Order
Lawn Tractor 46-in Deck 2-in-1 Blade 942-04290
#45

Mower deck/spindle pulley diagram

Lawn tractor 46-in deck 2-in-1 blade

Part #942-04290

Replaced by #942-04290A

?
Manufacturer substitution
This part replaces 942-04290. Substitute parts can look different from the original.
BEST SELLER

Get free shipping with Automatic Reorder

$22.79
56% OFF MSRP : $52.00
In Stock
Lawn Tractor Ground Drive Belt, 2/3 X 90-4/5-in (replaces 754-0467a, 954-0467) 954-0467A
#61

Transmission diagram

Lawn tractor ground drive belt, 2/3 x 90-4/5-in (replaces 754-0467a, 954-0467)

Part #954-0467A

Replaced by #490-501-Y035

?
Manufacturer substitution
This part replaces 954-0467A. Substitute parts can look different from the original.
BEST SELLER
$51.19
9% OFF Phone Price : $56.19
Back Order
Lawn & Garden Equipment Lock Nut, 5/16-18 (replaces 753-05591) 712-04063
Lawn & garden equipment lock nut, 5/16-18 (replaces 753-05591)

Part #712-04063

BEST SELLER
This item is not returnable
$4.21
19% OFF Phone Price : $5.21
In Stock
Lawn Tractor Ignition Key 625-04124
#31

Upper dash panel/fuel tank diagram

Lawn tractor ignition key

Part #625-04124

Replaced by #925-1745A

?
Manufacturer substitution
This part replaces 625-04124. Substitute parts can look different from the original.
BEST SELLER
$18.75
18% OFF MSRP : $23.00
In Stock
Lawn Tractor Transaxle Belt, 2/3 X 40-9/10-in 954-04208A
#60

Transmission diagram

Lawn tractor transaxle belt, 2/3 x 40-9/10-in

Part #954-04208A

Replaced by #490-501-Y007

?
Manufacturer substitution
This part replaces 954-04208A. Substitute parts can look different from the original.
BEST SELLER

Get free shipping with Automatic Reorder

$32.27
37% OFF MSRP : $51.00
In Stock
Lawn Tractor Bearing (replaces 741-04124) 941-04124
#16

Steering/wheels diagram

Lawn tractor bearing (replaces 741-04124)

Part #941-04124

BEST SELLER
This item is not returnable
$6.10
62% OFF MSRP : $16.00
In Stock
Lawn Tractor Flange Nut (replaces 00012173, Wd-129-103) 712-04065
Lawn tractor flange nut (replaces 00012173, wd-129-103)

Part #712-04065

BEST SELLER
This item is not returnable
$5.27
23% OFF MSRP : $6.80
In Stock
Lawn Tractor Gauge Wheel 734-04155
#31

Mower deck/spindle pulley diagram

Lawn tractor gauge wheel

Part #734-04155

BEST SELLER
$22.43
20% OFF MSRP : $28.00
In Stock

Most common symptoms to help you fix your 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: clogged carburetor, damaged flywheel key, dirty spark plug, stale fuel, improper valve lash, engine needs a…

Main causes: worn or broken ground drive belt, bad seat switch, transaxle freewheel control engaged, transaxle failure, …

Main causes: damaged tie rods, bent or worn wheel spindle, worn front axle, damaged sector gear assembly…

Main causes: engine overfilled with oil, leaky head gasket or sump gasket, damaged carburetor seals, cracked fuel pump, …

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 ma…

Main causes: damaged cutting blade, worn deck pulley, damaged mandrel pulley, loose fasteners on mower deck components…

Main causes: faulty battery, bad alternator…

Most common repair guides to help fix your riding mowers & tractors

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

How to replace a riding lawn mower rear tire

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
How to replace a riding lawn mower blade

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
How to replace a riding lawn mower fuel filter

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

Effective articles & videos to help repair your 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.

How to remove a lawn mower blade using a removal tool

How to remove a lawn mower blade using a removal tool

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

Charging a battery in a riding lawn mower video

Charging a battery in a riding lawn mower video

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

Riding mower and tractor common questions

Riding mower and tractor common questions

You might find the answers to your questions about your riding mower or lawn tractor in this list of frequently asked qu…