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Sears
Lawn & Garden Engine

Model # 550E785 Official Sears diesel engine

Here are the diagrams and repair parts for Official Sears 550E785 diesel engine, as well as links to manuals and error code tables, if available.

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Model diagram and schematic

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ALL PARTS
Showing 10 of 371 parts  |
Rubber Ring 1610002A
#28

Fuel tank diagram

Rubber ring

Part #1610002A

The manufacturer no longer makes this part, and there's no substitute part

Pin 6x28 50035300
Pin 6x28

Part #50035300

The manufacturer no longer makes this part, and there's no substitute part

Cap 40000200
#21

Starter diagram

Cap

Part #40000200

The manufacturer no longer makes this part, and there's no substitute part

Grooved Dowel Pin 50009500
#15

Starting handel diagram

Grooved dowel pin

Part #50009500

The manufacturer no longer makes this part, and there's no substitute part

Hexagon Screw (speed Control Adjustable) 50025100
#76D

Flange diagram

Hexagon screw (speed control adjustable)

Part #50025100

The manufacturer no longer makes this part, and there's no substitute part

Hexagon Screw M6x8 50025300
#29

Additional oil tank diagram

Hexagon screw m6x8

Part #50025300

The manufacturer no longer makes this part, and there's no substitute part

Dirt Scraper At Bearing Flange 2812207A
#27

Additional oil tank diagram

Dirt scraper at bearing flange

Part #2812207A

The manufacturer no longer makes this part, and there's no substitute part

Reduction Gear 2,8:1 ) 40038200
#60E

Flange diagram

Reduction gear 2,8:1 )

Part #40038200

The manufacturer no longer makes this part, and there's no substitute part

Glow Starting Switch Bosch With Plastic Button 40009500
#6

Dynamo starter diagram

Glow starting switch bosch with plastic button

Part #40009500

The manufacturer no longer makes this part, and there's no substitute part

Merit Indicator Lamp 40001500
#7

Starter diagram

Merit indicator lamp

Part #40001500

The manufacturer no longer makes this part, and there's no substitute part

Symptoms for gas walk-behind mowers

Choose a symptom to see related walk-behind mower repairs.

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Why does my lawn mower run rough?

Main causes: engine needs tune up, dirty or clogged carburetor, damaged flywheel key…

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Why does my lawn mower cut unevenly?

Main causes: uneven wheel height settings, damaged wheel, dull or damaged cutting blade…

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Why does my lawn mower vibrate a lot?

Main causes: damaged cutting blade, loose cutting blade, damaged flywheel key, engine needs tune up…

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Why won't my lawn mower start?

Main causes: stale gas, engine needs tune up, bad spark plug, dead battery, bad recoil starter, faulty safety switch, ba…

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Why does my lawn mower stall?

Main causes: dirty carburetor, bad spark plug, clogged air filter, engine choke problems, clogged gas cap vent…

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Why won't my lawn mower move?

Main causes: drive control cable failure, worn or broken drive belt, bad transmission, broken drive wheel…

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Repair guides for gas walk-behind mowers

These step-by-step repair guides will help you safely fix what’s broken on your walk-behind lawn mower.

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How to replace a lawn mower spark plug

How to replace a lawn mower spark plug

Take a few minutes to replace the spark plug during your lawn mower's annual tune-up or if the spark plug is burnt or cr…

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Repair difficulty
Time required
 15 minutes or less
How to replace a lawn mower blade

How to replace a lawn mower blade

Check your lawn mower blade regularly and replaced it if it's bent or damaged. …

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Repair difficulty
Time required
 15 minutes or less
How to replace a lawn mower flywheel key on a flathead engine

How to replace a lawn mower flywheel key on a flathead engine

When you hit a hard object with your mower, the flywheel can shear to protect more expensive components. Learn how to re…

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Repair difficulty
Time required
 45 minutes or less

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

Use the advice and tips in these articles and videos to get the most out of your walk-behind lawn mower.

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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.…

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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.…

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