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Ryobi
Gas Line Trimmer

Model # 790R Official Ryobi trimmer

Here are the diagrams and repair parts for Official Ryobi 790R 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 108 parts  |
Fuel Line 791-181168
#17

Cylinder/fuel tank/flywheel diagram

Fuel line

Part #791-181168

Replaced by #791-181086

?
Manufacturer substitution
This part replaces 791-181168. Substitute parts can look different from the original.
$10.88 | 
16% OFF Phone Price : $12.88
In Stock
Yard-man Lawn & Garden Equipment Screw (replaces Gw-9733) 791-181862
#30

Cylinder/fuel tank/flywheel diagram

Yard-man lawn & garden equipment screw (replaces gw-9733)

Part #791-181862

This item is not returnable
$5.81 | 
15% OFF Phone Price : $6.81
In Stock
Line Trimmer Fuel Line Assembly (replaces 753-04886) 791-682039
#18

Cylinder/fuel tank/flywheel diagram

Line trimmer fuel line assembly (replaces 753-04886)

Part #791-682039

This item is not returnable
$22.44 | 
21% OFF Phone Price : $28.44
In Stock
Line Trimmer Drive Shaft Housing (replaces 753-04346, 753-04347, 753-04351) 753-04344
#8

Handle/drive shaft/shield diagram

Line trimmer drive shaft housing (replaces 753-04346, 753-04347, 753-04351)

Part #753-04344

$87.56 | 
6% OFF Phone Price : $93.56
In Stock
Blade 791-145873
#40

Handle/drive shaft/shield diagram

Blade

Part #791-145873

Replaced by #791-145873B

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

Get free shipping with Automatic Reorder

$57.59 | 
9% OFF Phone Price : $63.59
In Stock
Starter Handle 791-181079
#27

Cylinder/fuel tank/flywheel diagram

Starter handle

Part #791-181079

Replaced by #631-04164B

?
Manufacturer substitution
This part replaces 791-181079. Substitute parts can look different from the original.
This item is not returnable
$6.19 | 
14% OFF Phone Price : $7.19
In Stock
Carburetor Assembly 753-04331
#6

Cylinder/fuel tank/flywheel diagram

Carburetor assembly

Part #753-04331

Replaced by #753-04338

?
Manufacturer substitution
This part replaces 753-04331. Substitute parts can look different from the original.
$89.88 | 
6% OFF Phone Price : $95.88
In Stock
Troybilt Lawn & Garden Equipment Clamp Nut 791-181815
#15

Handle/drive shaft/shield diagram

Troybilt lawn & garden equipment clamp nut

Part #791-181815

This item is not returnable
$7.43
In Stock
Bolens Line Trimmer Blade Driver 791-182196
#28

Handle/drive shaft/shield diagram

Bolens line trimmer blade driver

Part #791-182196

This item is not returnable
$30.36 | 
17% OFF Phone Price : $36.36
In Stock
Yard Machines Lawn & Garden Equipment Carburetor Rebuild Kit 791-180090

#NI02

All parts diagram

Yard machines lawn & garden equipment carburetor rebuild kit

Part #791-180090

$81.22
In Stock

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…

Read more
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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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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How to tune up a grass line trimmer video

How to tune up a grass line trimmer video

Tune of your grass line trimmer, following the steps in this video.…

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