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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Browse Parts for
UT20780 Line Trimmers
Gasket UP03916
Gasket

Part #UP03916

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

Cover UP00019
#10

Engine internal diagram

Cover

Part #UP00019

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

Grass Shield UP04888
#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 UP02964
Svc rear h

Part #UP02964

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

Screw UP05572
#11

Shaft/spool/string/grass deflector diagram

Screw

Part #UP05572

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

Clamp Spring UP03913
#15

Carburetor/fuel tank diagram

Clamp spring

Part #UP03913

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

Hex Nut UP03399
#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 UP04634
Muffler

Part #UP04634

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

Screw UP04082
#8

Muffler/air cleaner diagram

Screw

Part #UP04082

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

Machine Screw UP04258
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

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

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

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.

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.…

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…

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.…