MTD
Lawn & Garden Engine

Model # 478-SU Official MTD engine

Here are the diagrams and repair parts for Official MTD 478-SU 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 111 parts  |

Lawn Mower Fuel Cap 951-10649
#100

Engine diagram

Lawn mower fuel cap

Part #951-10649

Replaced by #951-12533

?
Manufacturer substitution
This part replaces 951-10649. Substitute parts can look different from the original.
BEST SELLER
This item is not returnable
$31.39
14% OFF Phone Price : $36.39
In Stock
Snowblower Throttle Knob (replaces 751-11224, 951-10757) 951-11224
#114

Engine diagram

Snowblower throttle knob (replaces 751-11224, 951-10757)

Part #951-11224

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
#34

Engine 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
Snowblower Carburetor 951-11193
#67

Engine diagram

Snowblower carburetor

Part #951-11193

Replaced by #951-14024A

?
Manufacturer substitution
This part replaces 951-11193. Substitute parts can look different from the original.
$91.43
30% OFF MSRP : $130.00
In Stock
Snowblower Engine Oil Drain Pipe And Cap (replaces 751-10641) 951-10641

#NI12

All parts diagram

Snowblower engine oil drain pipe and cap (replaces 751-10641)

Part #951-10641

This item is not returnable
$19.90
9% OFF Phone Price : $21.90
In Stock
Lawn & Garden Equipment Engine Fuel Bowl Mounting Bolt 710-04945
#138

Engine 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 & Garden Equipment Engine Flange Bolt 710-04974
#37

Engine diagram

Lawn & garden equipment engine flange bolt

Part #710-04974

This item is not returnable
In Stock
Choke Knob 951-11191
#35

Engine diagram

Choke knob

Part #951-11191

Replaced by #951-11302

?
Manufacturer substitution
This part replaces 951-11191. Substitute parts can look different from the original.
In Stock
Cylinder Baf 951-11180
#36

Engine diagram

Cylinder baf

Part #951-11180

In Stock
Snowblower Carburetor Insulator Gasket 951-11225
#64

Engine diagram

Snowblower carburetor insulator gasket

Part #951-11225

This item is not returnable
In Stock

Symptoms for electric ranges

Main causes: faulty surface element, burner control switch failure, temperature limiter not working properly, loose wiri…

Main causes: impact from dropping an item on the glass surface, ceramic glass surface flaw, surface element temperature …

Repair guides for electric ranges

How to replace a range hidden bake element

How to replace a range hidden bake element

These step-by-step instructions guide you through replacing the oven hidden bake element in an electric range.…

Repair difficulty
Time required
 30 minutes or less
How to replace an electric range oven door outer glass panel

How to replace an electric range oven door outer glass panel

Learn how to replace a damaged outer window panel on your oven door with these step-by-step instructions. …

Repair difficulty
Time required
 45 minutes or less
How to replace a range glass cooktop

How to replace a range glass cooktop

These step-by-step instructions explain how to replace a damaged ceramic glass cooktop on an electric range. …

Repair difficulty
Time required
 45 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.…