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Ryobi 990R string trimmer Parts
Here are the diagrams and repair parts for Ryobi 990R string trimmer, as well as links to manuals and error code tables, if available.
By Schematic
SELECT DIAGRAM
Browse Parts for 990R Line Trimmers
#NI
All parts diagram
Line
Part #180120
The manufacturer no longer makes this part, and there's no substitute part
Cylinder head diagram
Hose
Part #181026
The manufacturer no longer makes this part, and there's no substitute part
Lower boom & cutting head diagram
Blade Assembly
Part #682061
The manufacturer no longer makes this part, and there's no substitute part
Handle and upper boom diagram
Screw
Part #181095
The manufacturer no longer makes this part, and there's no substitute part
Cylinder head diagram
Gasket
Part #181029
The manufacturer no longer makes this part, and there's no substitute part
Cylinder head diagram
Screw
Part #181025
The manufacturer no longer makes this part, and there's no substitute part
Clutch,starter module&fuel tank diagram
Isolator
Part #181072
The manufacturer no longer makes this part, and there's no substitute part
Cylinder and crankcase diagram
Wrist Pin
Part #181006
The manufacturer no longer makes this part, and there's no substitute part
Clutch,starter module&fuel tank diagram
Housing
Part #181071
The manufacturer no longer makes this part, and there's no substitute part
Carburetor and muffler diagram
Gasket
Part #181048
The manufacturer no longer makes this part, and there's no substitute part
Most common symptoms to help you fix your 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 carbure…
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 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 time and Difficulty
15 minutes or less
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 time and Difficulty
15 minutes or less
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 time and Difficulty
15 minutes or less
Effective articles & videos to help repair your line trimmers
Use the advice and tips in these articles and videos to get the most out of your grass line trimmer.
Vapor lock can stop your trimmer cold in summer heat. Learn how to prevent it and keep your lawn looking sharp…
Trying to decide between a straight shaft and curved shaft trimmer? This guide compares both designs to help you underst…
Wondering if your weed whacker can pick up the slack for your broken lawn mower? You're not alone. In this guide, we bre…
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