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Homelite
Gas Line Trimmer

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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Model diagram and schematic

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ALL PARTS
Showing 10 of 141 parts  |
Hex Nut, Left UP04127
#29

Shaft/spool/string/grass deflector diagram

Hex nut, left

Part #UP04127

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

Screw UP03897
#14

Engine internal diagram

Screw

Part #UP03897

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

Blade UP04890
Blade

Part #UP04890

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

Tubing 0143910
#10

Carburetor/fuel tank diagram

Tubing

Part #0143910

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

Head String DA04591A
Head string

Part #DA04591A

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

Spacer UP04118
Spacer

Part #UP04118

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

Square Head Screw UP04892
Square head screw

Part #UP04892

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

Driveshaft UP05071
#8

Shaft/spool/string/grass deflector diagram

Driveshaft

Part #UP05071

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

Spool UP00145
Spool

Part #UP00145

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

Housing Head Cup UP06567
Housing head cup

Part #UP06567

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 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 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 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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Top 10 electric lawn and garden tools for 2023

Top 10 electric lawn and garden tools for 2023

Learn about the top 10 must-have electric lawn & garden tools for 2023…

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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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Grass line trimmer maintenance checklist

Grass line trimmer maintenance checklist

Find out how to take care of your grass line trimmer from the start of the trimming season until the end, with this help…

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