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Ryobi
Gas Line Trimmer

Model # 780R Official Ryobi 2-cycle gas trimmer

Here are the diagrams and repair parts for Official Ryobi 780R 2-cycle gas 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 101 parts  |
Blade 791-145873
#32

Boom and trimmer parts diagram

Blade

Part #791-145873

Replaced by #791-145873B

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Manufacturer substitution
This part replaces 791-145873. Substitute parts can look different from the original.

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In Stock
Mounting Hardware 791-182195
#20

Boom and trimmer parts diagram

Mounting hardware

Part #791-182195

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

Throttle Cable 753-04278
#6

Boom and trimmer parts diagram

Throttle cable

Part #753-04278

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

Cover Assembly 753-1192
#1

Engine parts diagram

Cover assembly

Part #753-1192

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

Cylinder Assembly (includes 49) 791-181622
#47

Engine parts diagram

Cylinder assembly (includes 49)

Part #791-181622

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

Housing 791-147486
#7

Boom and trimmer parts diagram

Housing

Part #791-147486

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

Mount Pad 791-612134
#14

Engine parts diagram

Mount pad

Part #791-612134

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

Fuel Line 791-181168
#17

Engine parts diagram

Fuel line

Part #791-181168

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

Lead Wire 791-182798
#40

Engine parts diagram

Lead wire

Part #791-182798

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

Shroud 791-153520
#20

Engine parts diagram

Shroud

Part #791-153520

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…

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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 …

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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

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

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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