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Model # UT20780 Official Homelite trimmer/brushcutter
Here are the diagrams and repair parts for Official Homelite UT20780 trimmer/brushcutter, as well as links to manuals and error code tables, if available.
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Browse Parts for
UT20780 Line Trimmers
Hex service engine
Part #UP02963
The manufacturer no longer makes this part, and there's no substitute part
Starter assembly
Part #UP02962
The manufacturer no longer makes this part, and there's no substitute part
Lock washer
Part #UP03409
The manufacturer no longer makes this part, and there's no substitute part
Flange washer
Part #UP03415
The manufacturer no longer makes this part, and there's no substitute part
#6A
Carburetor/fuel tank diagram
Shaft
Part #UP04278
The manufacturer no longer makes this part, and there's no substitute part
#1
Shaft/spool/string/grass deflector diagram
Handle
Part #UP06534
The manufacturer no longer makes this part, and there's no substitute part
#30
Shaft/spool/string/grass deflector diagram
Holding
Part #UP04100
The manufacturer no longer makes this part, and there's no substitute part
#9
Engine internal diagram
Screw
Part #UP04345
The manufacturer no longer makes this part, and there's no substitute part
Spark plug
Part #UP03883
The manufacturer no longer makes this part, and there's no substitute part
Gasket
Part #UP03916
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, clogged fuel filter, faulty spark plug, clogged air filter, cracked fuel lines, clogged carbure…
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…
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
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.
Learn about all the convenient features on our Sears PartsDirect website that make your parts purchases easier.…
Follow these tips to prevent the cutting line on your grass line trimmer from breaking or feeding out too much or too li…
Follow the steps in this video to replace a leaking fuel line in a line trimmer.…