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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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Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

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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
Throttle 791-182803
#3

Boom and trimmer parts diagram

Throttle

Part #791-182803

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

J-handle A 791-181099
#9

Boom and trimmer parts diagram

J-handle a

Part #791-181099

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

Rope 791-613103
#30

Engine parts diagram

Rope

Part #791-613103

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

Gear Assembly 791-182194
#36

Boom and trimmer parts diagram

Gear assembly

Part #791-182194

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

Gear 791-182198
#38

Boom and trimmer parts diagram

Gear

Part #791-182198

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

Screw 791-181345
#37

Engine parts diagram

Screw

Part #791-181345

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

Reel And Line Assembly 791-147345

#NI13

All parts diagram

Reel and line assembly

Part #791-147345

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

Repair Kit 791-180090

#NI02

All parts diagram

Repair kit

Part #791-180090

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…

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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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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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