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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  |
Screw, M4 660563002
#14

Powerhead/upper shaft/handle diagram

Screw, m4

Part #660563002

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

Clamp 518020001
#25

Powerhead/upper shaft/handle diagram

Clamp

Part #518020001

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

Heat Shield 638027002
#2

Muffler/carburetor/fuel tank/housing diagram

Heat shield

Part #638027002

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

Screw 660563001
#10

Muffler/carburetor/fuel tank/housing diagram

Screw

Part #660563001

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

(ut-04005) Eagle (no.67) (name 5-15r, Single) N/P
#29

Powerhead/upper shaft/handle diagram

(ut-04005) eagle (no.67) (name 5-15r, single)

Part #N/P

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

Rotor Nut 690689001
#39

Muffler/carburetor/fuel tank/housing diagram

Rotor nut

Part #690689001

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

Head Gear 308210001
#7

Trimmer head/straight shaft/guard diagram

Head gear

Part #308210001

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

Warning La 940657034
#4:1

Powerhead/upper shaft/handle diagram

Warning la

Part #940657034

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

Screw (10- 660736001
#4

Trimmer head/straight shaft/guard diagram

Screw (10-

Part #660736001

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

Nut (m5 X 690840001
#29

Muffler/carburetor/fuel tank/housing diagram

Nut (m5 x

Part #690840001

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

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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Solving 3 common problems with line trimmer cutting lines

Solving 3 common problems with line trimmer cutting lines

Follow these tips to prevent the cutting line on your grass line trimmer from breaking or feeding out too much or too li...

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How to replace a line trimmer fuel line video

How to replace a line trimmer fuel line video

Follow the steps in this video to replace a leaking fuel line in a line trimmer....

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