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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
Gasket
Part #UP03916
The manufacturer no longer makes this part, and there's no substitute part
#10
Engine internal diagram
Cover
Part #UP00019
The manufacturer no longer makes this part, and there's no substitute part
#11
Shaft/spool/string/grass deflector diagram
Grass shield
Part #UP04888
The manufacturer no longer makes this part, and there's no substitute part
Svc rear h
Part #UP02964
The manufacturer no longer makes this part, and there's no substitute part
#11
Shaft/spool/string/grass deflector diagram
Screw
Part #UP05572
The manufacturer no longer makes this part, and there's no substitute part
#15
Carburetor/fuel tank diagram
Clamp spring
Part #UP03913
The manufacturer no longer makes this part, and there's no substitute part
#7
Shaft/spool/string/grass deflector diagram
Hex nut
Part #UP03399
The manufacturer no longer makes this part, and there's no substitute part
Muffler
Part #UP04634
The manufacturer no longer makes this part, and there's no substitute part
#8
Muffler/air cleaner diagram
Screw
Part #UP04082
The manufacturer no longer makes this part, and there's no substitute part
Machine screw
Part #UP04258
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.…