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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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Showing 10 of 132 parts  |
Nut 81208
#24

Shaft/spool/shaft/grass deflector diagram

Nut

Part #81208

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

Rope UP03912
Rope

Part #UP03912

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

Screw UP03895
Screw

Part #UP03895

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

Driveshaft Housing Assembly (includes Keys 5 Thru 8) UP04357
#4

Shaft/spool/string/grass deflector diagram

Driveshaft housing assembly (includes keys 5 thru 8)

Part #UP04357

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

Screw UP03896
Screw

Part #UP03896

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

Fitting UP03831
#20

Carburetor/fuel tank diagram

Fitting

Part #UP03831

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

Screw 82531
Screw

Part #82531

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

Clutch UP04103
Clutch

Part #UP04103

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

D/shaft Hs UP03956
#12

Shaft/spool/string/grass deflector diagram

D/shaft hs

Part #UP03956

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

Interlock UP03173
Interlock

Part #UP03173

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 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 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 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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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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Solving 3 common problems with line trimmer cutting lines

Solving 3 common problems with line trimmer cutting lines

Follow these tips to prevent the cutting line on your grass line trimmer from breaking or feeding out too much or too li…

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How to replace a line trimmer fuel line video

How to replace a line trimmer fuel line video

Follow the steps in this video to replace a leaking fuel line in a line trimmer.…

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