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Ryobi
Gas Line Trimmer

Model # 990R Official Ryobi string trimmer

Here are the diagrams and repair parts for Official Ryobi 990R string 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 155 parts  |
Fuel Line 181085
#22

Clutch,starter module&fuel tank diagram

Fuel line

Part #181085

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

Spark Plug 180852
#17

Cylinder head diagram

Spark plug

Part #180852

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

Lever 181057
#17

Carburetor and muffler diagram

Lever

Part #181057

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

Hex Nut 181034
Hex nut

Part #181034

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

Spring 181038
#14

Cylinder head diagram

Spring

Part #181038

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

Screw 683607
#4

Lower boom & cutting head diagram

Screw

Part #683607

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

Lever 181058
#18

Carburetor and muffler diagram

Lever

Part #181058

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

Spool Line 147345

#NI

All parts diagram

Spool line

Part #147345

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

Gasket 181056
#16

Carburetor and muffler diagram

Gasket

Part #181056

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

Clutch Drum 180232
#4

Clutch,starter module&fuel tank diagram

Clutch drum

Part #180232

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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