Ryobi
Gas Line Trimmer

Model #780R Ryobi 2-cycle gas trimmer

Here are the repair parts and diagrams for your Ryobi 780R 2-cycle gas trimmer. 

The diagram(s) below can help you find the right part.  If you’d like help, we invite you to call our customer service number at the top of the page, or click chat.

On this page, you can also find any manuals, installation guides and error code tables associated with this model.

For advice on diagnosing problems with appliances, lawn & garden equipment and other products, check out the videos, repair guides and articles in our DIY section.

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Showing 10 of 101 parts

Line Trimmer Flexible Drive Shaft

#34

Boom and trimmer parts Diagram

Line trimmer flexible drive shaft

Part #791-181817
?This is a manufacturer substitution. Part may differ in appearance but is a functional equivalent to prior parts including  791-181817
This part replaces 791-181817

$47.82

In Stock

Line Trimmer Fuel Line

#17

Engine parts Diagram

Line trimmer fuel line

Part #791-181086
?This is a manufacturer substitution. Part may differ in appearance but is a functional equivalent to prior parts including  791-181168
This part replaces 791-181168
This item is not returnable

$5.25

In Stock

Repair

#NI03

All parts Diagram

Repair

Part #791-180091
?This is a manufacturer substitution. Part may differ in appearance but is a functional equivalent to prior parts including  791-180091
This part replaces 791-180091

$19.80

In Stock

Line Trimmer Bump Feed Knob

#31

Boom and trimmer parts Diagram

Line trimmer bump feed knob

Part #791-180814B
?This is a manufacturer substitution. Part may differ in appearance but is a functional equivalent to prior parts including  791-180814
This part replaces 791-180814

$14.66

In Stock

Lawn & Garden Equipment Engine Recoil Starter Spring

#26

Engine parts Diagram

Lawn & garden equipment engine recoil starter spring

Part #791-613102
?This is a manufacturer substitution. Part may differ in appearance but is a functional equivalent to prior parts including  791-613102
This part replaces 791-613102

$17.07

In Stock

Clutch Cover

#36

Engine parts Diagram

Clutch cover

Part #753-04889
?This is a manufacturer substitution. Part may differ in appearance but is a functional equivalent to prior parts including  791-182797
This part replaces 791-182797

$13.48

In Stock

Line Trimmer Handlebar Clamp

#10

Boom and trimmer parts Diagram

Line trimmer handlebar clamp

Part #791-683295
?This is a manufacturer substitution. Part may differ in appearance but is a functional equivalent to prior parts including  791-683295
This part replaces 791-683295

$31.62

In Stock

Line Trimmer Cutting Head

#NI14

All parts Diagram

Line trimmer cutting head

Part #791-147498
?This is a manufacturer substitution. Part may differ in appearance but is a functional equivalent to prior parts including  791-147498
This part replaces 791-147498

$75.74

In Stock

Clamp Handle

#12

Boom and trimmer parts Diagram

Clamp handle

Part #791-181812
?This is a manufacturer substitution. Part may differ in appearance but is a functional equivalent to prior parts including  791-181812
This part replaces 791-181812
This item is not returnable

$5.60

In Stock

Lawn & Garden Equipment Screw

#38

Engine parts Diagram

Lawn & garden equipment screw

Part #791-182519
?This is a manufacturer substitution. Part may differ in appearance but is a functional equivalent to prior parts including  791-182519
This part replaces 791-182519
This item is not returnable

$3.15

In Stock

Symptoms for gas line trimmers

Choose a symptom to see related grass line trimmer repairs.

Main causes: stale fuel, cracked fuel lines, dirty carburetor, bad spark plug, worn piston rings
Main causes: cracked fuel lines, bad carburetor seals, leaky fuel tank cap, damaged fuel tank
Main causes: stale fuel, clogged fuel filter, faulty spark plug, clogged air filter, cracked fuel lines, clogged carburetor

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.

October 1, 2013
By Lyle Weischwill
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 yourself, following these instructions.

Repair difficulty
Time required
 30 minutes or less
October 1, 2013
By Lyle Weischwill
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 these instructions to do the job in under 30 minutes.

Repair difficulty
Time required
 30 minutes or less
October 1, 2013
By Lyle Weischwill
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 instructions to replace the carburetor in under 30 minutes.

Repair difficulty
Time required
 30 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.

June 1, 2016

Tips for a hard-to-start grass line trimmer

By Sears PartsDirect staff

These tips may help you get your hard-to-start gas line trimmer running.

June 1, 2015

How to replace a line trimmer fuel line video

By Sears PartsDirect staff

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

March 1, 2015

Easy DIY grass line trimmer repairs

By Sears PartsDirect staff

Learn about some very easy do-it-yourself repairs for a grass line trimmer.