MTD
Lawn & Garden Engine

Model # 478-SUC Official MTD engine

Here are the diagrams and repair parts for Official MTD 478-SUC engine, 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 141 parts  |

Lawn & Garden Equipment Engine Fuel Tank Cap (replaces 951-10649a, 951-12532) 951-12533
#22

Fuel tank/mounting diagram

Lawn & garden equipment engine fuel tank cap (replaces 951-10649a, 951-12532)

Part #951-12533

BEST SELLER
This item is not returnable
$31.39
14% OFF Phone Price : $36.39
In Stock
Throttle Knob 951-10757
#3

Muffler & controls diagram

Throttle knob

Part #951-10757

Replaced by #951-11224

?
Manufacturer substitution
This part replaces 951-10757. Substitute parts can look different from the original.
This item is not returnable
$12.09
14% OFF Phone Price : $14.09
In Stock
Snowblower Ignition Switch (replaces 751-10637, 925-04031a) 951-10637
#5

Muffler & controls diagram

Snowblower ignition switch (replaces 751-10637, 925-04031a)

Part #951-10637

This item is not returnable
$18.67
10% OFF Phone Price : $20.67
In Stock
Lawn & Garden Equipment Engine Carburetor Float Bowl Gasket 951-11970
#U

Carburetor diagram

Lawn & garden equipment engine carburetor float bowl gasket

Part #951-11970

This item is not returnable
$10.46
16% OFF Phone Price : $12.46
In Stock
Lawn & Garden Equipment Engine Fuel Bowl Mounting Bolt 710-04945
#X

Carburetor diagram

Lawn & garden equipment engine fuel bowl mounting bolt

Part #710-04945

This item is not returnable
$6.46
13% OFF Phone Price : $7.46
In Stock
Lawn Tractor Engine Oil Drain Pipe (replaces 751-11350) 951-11350
#112

Crankcase diagram

Lawn tractor engine oil drain pipe (replaces 751-11350)

Part #951-11350

This item is not returnable
In Stock
Lawn & Garden Equipment Engine Carburetor Primer Bulb 951-11824
#174

Carburetor diagram

Lawn & garden equipment engine carburetor primer bulb

Part #951-11824

This item is not returnable
$17.13
10% OFF Phone Price : $19.13
In Stock
Lawn & Garden Equipment Engine Choke Control Knob 951-11302
#8

Muffler & controls diagram

Lawn & garden equipment engine choke control knob

Part #951-11302

In Stock
Cap 951-12081
#156

Cylinder head diagram

Cap

Part #951-12081

Replaced by #951-12269

?
Manufacturer substitution
This part replaces 951-12081. Substitute parts can look different from the original.
This item is not returnable
$9.65
9% OFF Phone Price : $10.65
In Stock
Retainer 951-12077
#153

Cylinder head diagram

Retainer

Part #951-12077

Replaced by #951-12077A

?
Manufacturer substitution
This part replaces 951-12077. Substitute parts can look different from the original.
This item is not returnable
In Stock

Symptoms for gas ranges

Main causes: gas supply problem, faulty pressure regulator, clogs in burner or orifice, control system failure, faulty t…

Main causes: burner igniter switch failure, bad spark module, dirty or damaged spark electrode, wiring failure…

Repair guides for gas ranges

How to replace oven door hinges on a gas range

How to replace oven door hinges on a gas range

See how to replace the oven door hinges on a gas range yourself, in just 30 minutes.…

Repair difficulty
Time required
 15 minutes or less
How to replace a range spark igniter switch

How to replace a range spark igniter switch

Follow these steps to replace the spark igniter switch—sometimes called a burner switch or spark switch—on a gas or dual…

Repair difficulty
Time required
 60 minutes or less
How to replace a gas range oven control board

How to replace a gas range oven control board

These step-by-step instructions explain how to replace an oven control board on a gas range…

Repair difficulty
Time required
 15 minutes or less

Effective articles & videos to help repair your lawn & garden engines

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.…

What are the main components of a lawn mower?

What are the main components of a lawn mower?

Learn about the main parts of a lawn mower and when to replace parts.…