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Toro
Gas Line Trimmer

Model # 51974 (310000001 AND UP) Official Toro trimmer

Here are the diagrams and repair parts for Official Toro 51974-310000001-AND-UP trimmer, 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 80 parts  |
Line Trimmer Screw 660734001
#28

Powerhead/upper shaft/handle diagram

Line trimmer screw

Part #660734001

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

Spark Plug 870174001
#7

Muffler/carburetor/fuel tank/housing diagram

Spark plug

Part #870174001

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

Grass Deflector 638125003
#3

Trimmer head/straight shaft/guard diagram

Grass deflector

Part #638125003

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

Cover Assembly 308207004
#25

Muffler/carburetor/fuel tank/housing diagram

Cover assembly

Part #308207004

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

Line Trimmer Clamp 518038001
#23

Powerhead/upper shaft/handle diagram

Line trimmer clamp

Part #518038001

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

Line Trimmer Housing 300754023
#36

Muffler/carburetor/fuel tank/housing diagram

Line trimmer housing

Part #300754023

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

Element (a 560873001
#24

Muffler/carburetor/fuel tank/housing diagram

Element (a

Part #560873001

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

Line Trimmer Drive Shaft, Upper 308159015
#4

Powerhead/upper shaft/handle diagram

Line trimmer drive shaft, upper

Part #308159015

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

Carburetor Gasket 900711008
#30

Muffler/carburetor/fuel tank/housing diagram

Carburetor gasket

Part #900711008

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

Label War 940230132
#2

Trimmer head/straight shaft/guard diagram

Label war

Part #940230132

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

Symptoms for gas line trimmers

Choose a symptom to see related grass line trimmer repairs.

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Why won't my gas line trimmer start?

Main causes: stale fuel, cracked fuel lines, dirty carburetor, bad spark plug, worn piston rings…

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Why does my gas line trimmer run rough?

Main causes: stale fuel, clogged fuel filter, faulty spark plug, clogged air filter, cracked fuel lines, clogged carbure…

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Why does my gas line trimmer leak gas?

Main causes: cracked fuel lines, bad carburetor seals, leaky fuel tank cap, damaged fuel tank…

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Repair guides for gas line trimmers

These step-by-step repair guides will help you safely fix what’s broken on your grass line trimmer.

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How to rebuild a line trimmer carburetor

How to rebuild a line trimmer carburetor

If the line trimmer engine won't start even though there's fuel in the tank, the carburetor could be the problem. Follow…

Read more
Repair difficulty
Time required
 15 minutes or less
How to replace a line trimmer carburetor

How to replace a line trimmer carburetor

If the line trimmer won't start even though there's fuel in the tank, the carburetor could be the problem. Follow these …

Read more
Repair difficulty
Time required
 15 minutes or less
How to replace a line trimmer fuel line

How to replace a line trimmer fuel line

The fuel line on a grass line trimmer deteriorates with time and eventually can split or crack. You can replace it yours…

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Repair difficulty
Time required
 15 minutes or less

Articles and videos for gas line trimmers

Use the advice and tips in these articles and videos to get the most out of your grass line trimmer.

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Top 10 electric lawn and garden tools for 2023

Learn about the top 10 must-have electric lawn & garden tools for 2023…

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How to enjoy all the online benefits we offer on our Sears PartsDirect website

Learn about all the convenient features on our Sears PartsDirect website that make your parts purchases easier.…

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Grass line trimmer maintenance checklist

Grass line trimmer maintenance checklist

Find out how to take care of your grass line trimmer from the start of the trimming season until the end, with this help…

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