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.

There are a couple of ways to find the part or diagram you need:

  • Click a diagram to see the parts shown on that diagram.
  • In the search box below, enter all or part of the part number or the part’s name.

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

We encourage you to save the model to your profile, so it’s easy to access parts and manuals for your appliance whenever you log in.

For DIY troubleshooting advice and repair guides, visit our repair help section.

Model diagram and schematic

SEARCH WITHIN THIS MODEL

?

This is the number corresponding to the part on the diagram / schematic

Search
ALL PARTS
Showing 10 of 108 parts  |

Spring 791-610636
#37

Handle/drive shaft/shield diagram

Spring

Part #791-610636

Replaced by #791-610636B

?
Manufacturer substitution
This part replaces 791-610636. Substitute parts can look different from the original.
BEST SELLER
This item is not returnable
$13.14
13% OFF Phone Price : $15.14
In Stock
Lawn & Garden Equipment Engine Start/stop Switch (replaces 182405) 791-182405
#5

Handle/drive shaft/shield diagram

Lawn & garden equipment engine start/stop switch (replaces 182405)

Part #791-182405

BEST SELLER
$8.87
48% OFF MSRP : $17.00
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

BEST SELLER
This item is not returnable
$14.14
48% OFF MSRP : $27.00
In Stock
Lawn & Garden Equipment Screw 791-182519
#47

Cylinder/fuel tank/flywheel diagram

Lawn & garden equipment screw

Part #791-182519

This item is not returnable
$6.19
24% OFF MSRP : $8.10
In Stock
Lawn & Garden Equipment Screw 791-182057
#18

Handle/drive shaft/shield diagram

Lawn & garden equipment screw

Part #791-182057

This item is not returnable
$6.87
13% OFF Phone Price : $7.87
In Stock
Tiller Clutch Cover Screw 791-181345
#35

Cylinder/fuel tank/flywheel diagram

Tiller clutch cover screw

Part #791-181345

This item is not returnable
$5.28
16% OFF Phone Price : $6.28
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.
$77.63
29% OFF MSRP : $110.00
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
8% OFF Phone Price : $62.59
In Stock
Line Trimmer Spool 791-147495
#38

Handle/drive shaft/shield diagram

Line trimmer spool

Part #791-147495

In Stock
Line Trimmer Gearbox 791-182193
#25

Handle/drive shaft/shield diagram

Line trimmer gearbox

Part #791-182193

$108.62
8% OFF Phone Price : $118.62
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: stale fuel, clogged fuel filter, faulty spark plug, clogged air filter, cracked fuel lines, clogged carbure…

Main causes: cracked fuel lines, bad carburetor seals, leaky fuel tank cap, damaged fuel tank…

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.

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…

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 …

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…

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.

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…

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.…

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…