MTD
Lawn & Garden Engine

Model # 4P90HU Official MTD engine

Here are the diagrams and repair parts for Official MTD 4P90HU 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 170 parts  |

Lawn Tractor Engine Manifold Gasket 951-12258
Lawn tractor engine manifold gasket

Part #951-12258

Replaced by #951-12258A

?
Manufacturer substitution
This part replaces 951-12258. Substitute parts can look different from the original.
This item is not returnable
$6.35
14% OFF Phone Price : $7.35
In Stock
Lawn & Garden Equipment Engine Flywheel Key 951-10307
#77

Crankshaft/gear 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
Guide 951-12268
#150

Cylinder head/camshaft diagram

Guide

Part #951-12268

This item is not returnable
In Stock
Lawn Tractor Engine Sump Filter 951-12249
#100

Crankshaft/gear diagram

Lawn tractor engine sump filter

Part #951-12249

This item is not returnable
$6.35
14% OFF Phone Price : $7.35
In Stock
Lawn & Garden Equipment Engine Valve Cover Gasket 951-12267
#144

Cylinder head/camshaft diagram

Lawn & garden equipment engine valve cover gasket

Part #951-12267

This item is not returnable
$14.25
12% OFF Phone Price : $16.25
In Stock
Lawn & Garden Equipment Engine Piston Ring Set 951-12275
#176

Short block diagram

Lawn & garden equipment engine piston ring set

Part #951-12275

This item is not returnable
$32.76
15% OFF Phone Price : $38.76
In Stock
Lawn Tractor Engine Oil Drain Plug (replaces 710-05311) 951-11644
#84

Crankshaft/gear diagram

Lawn tractor engine oil drain plug (replaces 710-05311)

Part #951-11644

This item is not returnable
$15.69
11% OFF Phone Price : $17.69
In Stock
Linkage 951-12230
#59

Short block diagram

Linkage

Part #951-12230

This item is not returnable
In Stock
Lawn & Garden Equipment Engine Exhaust Gasket 951-12271
#158

Cylinder head/camshaft diagram

Lawn & garden equipment engine exhaust gasket

Part #951-12271

This item is not returnable
In Stock
Lawn & Garden Equipment Engine Cylinder Head Gasket 951-12273
#170

Cylinder head/camshaft diagram

Lawn & garden equipment engine cylinder head gasket

Part #951-12273

$52.66
10% OFF Phone Price : $58.66
In Stock

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.…