MTD
Lawn & Garden Engine

Model # 478-SUB Official MTD engine

Here are the diagrams and repair parts for Official MTD 478-SUB 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 Spark Plug 951-10292
#108

Cylinder head diagram

Lawn & garden equipment engine spark plug

Part #951-10292

Replaced by #951-10292A

?
Manufacturer substitution
This part replaces 951-10292. Substitute parts can look different from the original.
BEST SELLER
This item is not returnable
$6.47
60% OFF MSRP : $16.00
In Stock
Snowblower Oil Drain Plug 710-04906
#80

Crankshaft/crankcase diagram

Snowblower oil drain plug

Part #710-04906

This item is not returnable
$10.26
16% OFF Phone Price : $12.26
In Stock
Throttle Knob 951-10757
#4

Muffler 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
Lawn & Garden Equipment Engine Huayi 178s & 178sa Carburetor (replaces 751-14024a, 951-11193a) 951-14024A
#133

Carburetor diagram

Lawn & garden equipment engine huayi 178s & 178sa carburetor (replaces 751-14024a, 951-11193a)

Part #951-14024A

$91.43
30% OFF MSRP : $130.00
In Stock
Snowblower Ignition Switch (replaces 751-10637, 925-04031a) 951-10637
#8

Muffler 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
#V

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
#Y

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
#78

Crankshaft/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
#135

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
Snowblower Oil Fill Plug Assembly 951-11283
#61

Crankshaft/crankcase diagram

Snowblower oil fill plug assembly

Part #951-11283

This item is not returnable
$10.77
16% OFF Phone Price : $12.77
In Stock

Symptoms for upright freezers

Main causes: clogged or frozen defrost drain tube…

Repair guides for upright freezers

How to replace a freezer control panel

How to replace a freezer control panel

A freezer control panel that doesn’t show the temperature or respond when you press the buttons could be broken. This DI…

Repair difficulty
Time required
 15 minutes or less
How to replace a freezer door switch

How to replace a freezer door switch

When the door switch fails, the freezer can’t detect that the door is closed. Follow the steps in this repair guide to r…

Repair difficulty
Time required
 15 minutes or less
How to replace a freezer thermistor

How to replace a freezer thermistor

When the thermistor can’t sense the freezer temperature, the freezer is colder or warmer than the set temperature. Follo…

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.…