Homelite
Gas Line Trimmer

Model #UT20779 Homelite string trimmer/brushcutter

Here are the diagrams and repair parts for Homelite UT20779 string trimmer/brushcutter, as well as links to manuals and error code tables, if available.

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For DIY troubleshooting advice and repair guides, visit our repair help section.

    Showing 10 of 132 parts

    Lawn & Garden Equipment Engine Spark Plug

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    Spark plug

    Part #UP03883
    Replaced by #RCJ6Y
    ?
    Manufacturer substitution
    This part replaces UP03883. Substitute parts can look different from the original.
    BEST SELLER
    This item is not returnable
    In Stock
    $3.19 | 
    11% OFF 
    Was: $3.59
    Flat Washer, 8-pack#11

    Shaft/spool/string/grass deflector Diagram

    Flange washer

    Part #UP03415
    Replaced by #STD551025
    ?
    Manufacturer substitution
    This part replaces UP03415. Substitute parts can look different from the original.
    This item is not returnable
    Back Order
    $2.29 | 
    30% OFF 
    Phone Price: $3.29
    Flat Washer, 8-pack#19

    Shaft/spool/shaft/grass deflector Diagram

    Washer

    Part #84006
    Replaced by #STD551025
    ?
    Manufacturer substitution
    This part replaces 84006. Substitute parts can look different from the original.
    This item is not returnable
    Back Order
    $2.29 | 
    30% OFF 
    Phone Price: $3.29
    Line Trimmer Cutting Head Assembly

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    Spl&string

    Part #UP00147
    Replaced by #000998265
    ?
    Manufacturer substitution
    This part replaces UP00147. Substitute parts can look different from the original.
    In Stock
    $57.05
    Leaf Blower Fuel Line#16

    Carburetor/fuel tank Diagram

    Tubing

    Part #UP04292
    Replaced by #01439-10
    ?
    Manufacturer substitution
    This part replaces UP04292. Substitute parts can look different from the original.
    This item is not returnable
    In Stock
    $2.16
    Line Trimmer Cutting Head Assembly

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    Head string

    Part #DA04591A
    Replaced by #000998265
    ?
    Manufacturer substitution
    This part replaces DA04591A. Substitute parts can look different from the original.
    In Stock
    $57.05
    Truss Hd S

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    Truss hd s

    Part #UP04247
    This item is not returnable
    In Stock
    $2.16
    Piston Rod#2

    Engine internal Diagram

    Piston rod

    Part #UP00768
    In Stock
    $55.40
    Gasket#5

    Engine internal Diagram

    Gasket

    Part #UP03857
    This item is not returnable
    In Stock
    $2.73
    Washer#20

    Shaft/spool/shaft/grass deflector Diagram

    Washer

    Part #83009

    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: cracked fuel lines, bad carburetor seals, leaky fuel tank cap, damaged fuel tank
    Main causes: stale fuel, cracked fuel lines, dirty carburetor, bad spark plug, worn piston rings
    Main causes: stale fuel, clogged fuel filter, faulty spark plug, clogged air filter, cracked fuel lines, clogged carburetor

    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.

    October 1, 2013
    By Lyle Weischwill
    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 these instructions to do the job in under 30 minutes.

    Repair difficulty
    Time required
     15 minutes or less
    October 1, 2013
    By Lyle Weischwill
    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 instructions to replace the carburetor in under 30 minutes.

    Repair difficulty
    Time required
     15 minutes or less
    October 1, 2013
    By Lyle Weischwill
    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 yourself, following these instructions.

    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.

    August 30, 2022

    How to enjoy all the online benefits we offer on our Sears PartsDirect website

    By Sears PartsDirect staff

    Learn about all the convenient features on our Sears PartsDirect website that make your parts purchases easier.

    June 1, 2016

    Tips for a hard-to-start grass line trimmer

    By Sears PartsDirect staff

    These tips may help you get your hard-to-start gas line trimmer running.

    March 1, 2016

    Grass line trimmer maintenance checklist

    By Sears PartsDirect staff

    Find out how to take care of your grass line trimmer from the start of the trimming season until the end, with this helpful maintenance checklist.