Ryobi
Gas Line Trimmer

Model #720R-1 Ryobi trimmer

Here are the diagrams and repair parts for Ryobi 720R-1 trimmer, as well as links to manuals and error code tables, if available.

There are a couple of ways to find the part or diagram you need:

  • Click a diagram to see the parts shown on that diagram.
  • In the search box below, enter all or part of the part number or the part’s name.

Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

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

    Showing 10 of 102 parts

    Line Trimmer Bump Feed Knob

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    Knob assembly

    Part #153066
    Replaced by #791-153066B
    ?
    Manufacturer substitution
    This part replaces 153066. Substitute parts can look different from the original.
    BEST SELLER
    In Stock
    $10.39 | 
    26% OFF 
    MSRP: $14.00
    Line Trimmer Primer Bulb and Hose Assembly#8

    Engine Diagram

    Primer hose

    Part #683974
    Replaced by #791-683974B
    ?
    Manufacturer substitution
    This part replaces 683974. Substitute parts can look different from the original.
    BEST SELLER
    In Stock
    $14.23 | 
    35% OFF 
    MSRP: $22.00
    Line Trimmer Spool#26

    Boom & trimmer Diagram

    Inner reel

    Part #153600
    Replaced by #753-1155
    ?
    Manufacturer substitution
    This part replaces 153600. Substitute parts can look different from the original.
    BEST SELLER
    In Stock
    $20.69 | 
    19% OFF 
    Phone Price: $25.69
    Line Trimmer Flexible Drive Shaft, Lower#13

    Boom & trimmer Diagram

    Shaft

    Part #683608
    Replaced by #791-181852
    ?
    Manufacturer substitution
    This part replaces 683608. Substitute parts can look different from the original.
    BEST SELLER
    In Stock
    $52.59 | 
    12% OFF 
    MSRP: $60.00
    Lawn & Garden Equipment 2-Cycle Engine Oil, 6-pack

    #NI

    All parts Diagram

    2-cycle oil

    Part #147541
    Replaced by #21603
    ?
    Manufacturer substitution
    This part replaces 147541. Substitute parts can look different from the original.

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    In Stock
    $9.99 | 
    9% OFF 
    Phone Price: $10.99
    Lawn & Garden Equipment Engine Carburetor Mounting Gasket#7

    Engine Diagram

    Gasket

    Part #610675
    Replaced by #791-610675
    ?
    Manufacturer substitution
    This part replaces 610675. Substitute parts can look different from the original.
    This item is not returnable
    In Stock
    $5.29 | 
    16% OFF 
    Phone Price: $6.29
    Pull Handle#33

    Engine Diagram

    Handle

    Part #610300
    Replaced by #631-04164B
    ?
    Manufacturer substitution
    This part replaces 610300. Substitute parts can look different from the original.
    This item is not returnable
    In Stock
    $6.19 | 
    14% OFF 
    Phone Price: $7.19
    Line Trimmer Cutting Blade

    #NI

    All parts Diagram

    Blade

    Part #145873
    Replaced by #791-145873B
    ?
    Manufacturer substitution
    This part replaces 145873. Substitute parts can look different from the original.
    In Stock
    $57.59 | 
    8% OFF 
    Phone Price: $62.59
    Line Trimmer Drive Shaft Housing#7

    Boom & trimmer Diagram

    Housing

    Part #683603
    Replaced by #753-04344
    ?
    Manufacturer substitution
    This part replaces 683603. Substitute parts can look different from the original.
    In Stock
    $84.69 | 
    6% OFF 
    Phone Price: $89.69
    Lawn & Garden Equipment Engine Carburetor Mount Gasket#13

    Engine Diagram

    Gasket

    Part #612115
    Replaced by #753-1208
    ?
    Manufacturer substitution
    This part replaces 612115. Substitute parts can look different from the original.
    This item is not returnable
    In Stock
    $21.49 | 
    19% OFF 
    Phone Price: $26.49

    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 Lyle Weischwill

    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 Lyle Weischwill

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

    March 1, 2016

    Grass line trimmer maintenance checklist

    By Lyle Weischwill

    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.