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Homelite
Gas Line Trimmer

Model # UT20779 Official Homelite string trimmer/brushcutter

Here are the diagrams and repair parts for Official Homelite UT20779 string 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 132 parts  |
Screw UP04140
#4

Carburetor/fuel tank diagram

Screw

Part #UP04140

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

Svcknob Kt UP05137
Svcknob kt

Part #UP05137

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

Hex Head Cap UP04158
Hex head cap

Part #UP04158

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

Rotor UP03009
Rotor

Part #UP03009

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

Shaft Assembly UP03851
#12

Shaft/spool/shaft/grass deflector diagram

Shaft assembly

Part #UP03851

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

Short Block UP02994
Short block

Part #UP02994

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

Clamp Spring UP03913
#21

Carburetor/fuel tank diagram

Clamp spring

Part #UP03913

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

Svc Rear H UP02964
#22

Ignition/rotor/starter/clutch diagram

Svc rear h

Part #UP02964

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

Head Spring UP03210
Head spring

Part #UP03210

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

Truss Hd S UP04247
Truss hd s

Part #UP04247

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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