Can’t find your part?   Contact us:
+1-309-603-4777
Sears Parts Direct
Orders

  • Keep track of the models you own in your profile

    Sign in or Register to view or add models

Schedule a repair
MTD
Lawn & Garden Engine

Model # 478-SUA Official MTD engine

Here are the diagrams and repair parts for Official MTD 478-SUA 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 151 parts  |
Lawn & Garden Equipment Engine Fuel Filter (replaces 751-10651) 951-10651

#NI07

All parts diagram

Lawn & garden equipment engine fuel filter (replaces 751-10651)

Part #951-10651

BEST SELLER
$19.98 | 
23% OFF MSRP : $26.00
In Stock
Key 731-05632
#7

Muffler & controls diagram

Key

Part #731-05632

Replaced by #951-10630

?
Manufacturer substitution
This part replaces 731-05632. Substitute parts can look different from the original.
BEST SELLER
$8.44 | 
11% OFF Phone Price : $9.44
In Stock
Lawn & Garden Equipment Engine Carburetor Primer Bulb (replaces 951-10639) 951-10639A
#133

Carburetor diagram

Lawn & garden equipment engine carburetor primer bulb (replaces 951-10639)

Part #951-10639A

BEST SELLER
$26.71 | 
16% OFF Phone Price : $31.71
In Stock
Lawn & Garden Equipment Engine Carburetor Float Bowl Gasket 951-11349
#X

Carburetor diagram

Lawn & garden equipment engine carburetor float bowl gasket

Part #951-11349

Replaced by #951-11349A

?
Manufacturer substitution
This part replaces 951-11349. Substitute parts can look different from the original.
BEST SELLER
This item is not returnable
$5.24 | 
22% OFF MSRP : $6.70
In Stock
Fuel Cap 951-12532
#16

Fuel tank & mounting diagram

Fuel cap

Part #951-12532

Replaced by #951-12533

?
Manufacturer substitution
This part replaces 951-12532. Substitute parts can look different from the original.
This item is not returnable
$31.39 | 
14% OFF Phone Price : $36.39
In Stock
Snowblower Carburetor Gasket (replaces 751-11223) 951-11223
#131

Carburetor diagram

Snowblower carburetor gasket (replaces 751-11223)

Part #951-11223

This item is not returnable
$8.09 | 
11% OFF Phone Price : $9.09
In Stock
Throttle Knob 951-10757
#4

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 Recoil Starter Assembly (replaces 751-11208) 951-11208
#96

Starting system & blower housing diagram

Snowblower recoil starter assembly (replaces 751-11208)

Part #951-11208

$88.72 | 
26% OFF MSRP : $120.00
In Stock
Lawn & Garden Equipment Engine Flywheel Key 951-10307
#56

Crankcase diagram

Lawn & garden equipment engine flywheel key

Part #951-10307

Replaced by #751P10307A

?
Manufacturer substitution
This part replaces 951-10307. Substitute parts can look different from the original.
This item is not returnable
$3.22 | 
24% OFF Phone Price : $4.22
In Stock
Snowblower Carburetor Insulator Gasket 951-11225
#129

Carburetor diagram

Snowblower carburetor insulator gasket

Part #951-11225

This item is not returnable
$6.03
In Stock

RECOMMENDED MAINTENANCE PARTS AND ACCESSORIES

Repair guides for front-engine lawn tractors

How to replace a blade clutch cable on a riding lawn mower

How to replace a blade clutch cable on a riding lawn mower

If the blades don't spin on your riding mower when you shift the lever, the blade clutch cable could be broken. Here’s h…

Read more
Repair difficulty
Time required
 30 minutes or less
How to replace the brake interlock switch on a riding lawn mower

How to replace the brake interlock switch on a riding lawn mower

If the engine won’t start even though the brake is on, the brake interlock switch could be at fault. Here’s how to repla…

Read more
Repair difficulty
Time required
 30 minutes or less
How to replace a riding lawn mower blade drive belt

How to replace a riding lawn mower blade drive belt

Replace the blade drive belt if it's broken or won't spin the cutting blades because of wear.…

Read more
Repair difficulty
Time required
 45 minutes or less

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

View all
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.…

Read more
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.…

Read more

Parts & More