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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.
By Schematic
SELECT DIAGRAM
Browse Parts for
990R Line Trimmers
#10
Lower boom & cutting head diagram
Screw
Part #683304
The manufacturer no longer makes this part, and there's no substitute part
#NI
All parts diagram
Block
Part #181042
The manufacturer no longer makes this part, and there's no substitute part
#18
Cylinder and crankcase diagram
Shaft
Part #181017
The manufacturer no longer makes this part, and there's no substitute part
#10
Carburetor and muffler diagram
Cover
Part #181051
The manufacturer no longer makes this part, and there's no substitute part
#NI
All parts diagram
Cylinder
Part #181041
The manufacturer no longer makes this part, and there's no substitute part
#7
Carburetor and muffler diagram
Gasket
Part #181048
The manufacturer no longer makes this part, and there's no substitute part
#19
Carburetor and muffler diagram
Gasket
Part #181059
The manufacturer no longer makes this part, and there's no substitute part
Screw
Part #181003
The manufacturer no longer makes this part, and there's no substitute part
#30
Carburetor and muffler diagram
Ground tab
Part #611063
The manufacturer no longer makes this part, and there's no substitute part
#20
Cylinder and crankcase diagram
Oil pan
Part #181019
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.
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
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
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
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
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.
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…