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Homelite UT20780 trimmer/brushcutter

Homelite UT20780 trimmer/brushcutter Parts

Here are the diagrams and repair parts for 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

  • Electrical L for Homelite UT20780 - Part A06963

    Lead

    Part #UP04536

    Replaced by #A06963

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    Manufacturer substitution
    This part replaces UP04536. Substitute parts can look different from the original.
    This item is not returnable
    In Stock
    $2.29
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  • Screw Thd. F for Homelite UT20780 - Part 82513

    Muffler/air cleaner diagram

    Screw

    Part #UP04082

    Replaced by #82513

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    Manufacturer substitution
    This part replaces UP04082. Substitute parts can look different from the original.
    This item is not returnable
    In Stock
    $2.16
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  • Cupped Washe for Homelite UT20780 - Part 04409

    Shaft/spool/string/grass deflector diagram

    Washer

    Part #UP04129

    Replaced by #04409

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    Manufacturer substitution
    This part replaces UP04129. Substitute parts can look different from the original.
    This item is not returnable
    In Stock
    $2.74
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  • Trigger With for Homelite UT20780 - Part UP03207A

    Trigger

    Part #UP03207

    Replaced by #UP03207A

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    Manufacturer substitution
    This part replaces UP03207. Substitute parts can look different from the original.
    This item is not returnable
    In Stock
    $3.74
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    Qty
    Plus Item
  • Interlock,th for Homelite UT20780 - Part PS01128

    Interlock

    Part #UP03173

    Replaced by #PS01128

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    Manufacturer substitution
    This part replaces UP03173. Substitute parts can look different from the original.
    This item is not returnable
    In Stock
    $7.31
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    Qty
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  • Screw Thread for Homelite UT20780 - Part 82563

    Screw

    Part #UP03900

    Replaced by #82563

    Info Icon
    Manufacturer substitution
    This part replaces UP03900. Substitute parts can look different from the original.
    This item is not returnable
    In Stock
    $2.16
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    Qty
    Plus Item
  • Spring Compr for Homelite UT20780 - Part 06713

    Head Spring

    Part #UP06526

    Replaced by #06713

    Info Icon
    Manufacturer substitution
    This part replaces UP06526. Substitute parts can look different from the original.
    In Stock
    $25.57
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  • Spring & Con for Homelite UT20780 - Part 638033001

    Spring

    Part #UP03917

    Replaced by #638033001

    Info Icon
    Manufacturer substitution
    This part replaces UP03917. Substitute parts can look different from the original.
    In Stock
    $28.22
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    Qty
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  • Adapter Shaf for Homelite UT20780 - Part 04355

    Shaft/spool/string/grass deflector diagram

    Shaft

    Part #UP04128

    Replaced by #04355

    Info Icon
    Manufacturer substitution
    This part replaces UP04128. Substitute parts can look different from the original.
    In Stock
    $13.77
    Minus Item
    Qty
    Plus Item
  • Cylinder Kit for Homelite UT20780 - Part UP07145A

    Engine internal diagram

    Cylinder Kit

    Part #UP04136

    Replaced by #UP07145A

    Info Icon
    Manufacturer substitution
    This part replaces UP04136. Substitute parts can look different from the original.
    In Stock
    $36.42
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Most common symptoms to help you fix your line trimmers

Choose a symptom to see related grass line trimmer repairs.

View all

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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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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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 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…

Read more

Repair time and Difficulty

 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 …

Read more

Repair time and Difficulty

 15 minutes or less
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…

Read more

Repair time and Difficulty

 15 minutes or less

Effective articles & videos to help repair your 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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Line trimmer: Preventing fuel vapor lock in hot summer conditions

Line trimmer: Preventing fuel vapor lock in hot summer conditions

Vapor lock can stop your trimmer cold in summer heat. Learn how to prevent it and keep your lawn looking sharp…

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Straight shaft vs curved shaft trimmers: What’s the difference?

Straight shaft vs curved shaft trimmers: What’s the difference?

Trying to decide between a straight shaft and curved shaft trimmer? This guide compares both designs to help you underst…

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Can you cut grass with a weed whacker?

Can you cut grass with a weed whacker?

Wondering if your weed whacker can pick up the slack for your broken lawn mower? You're not alone. In this guide, we bre…

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