MTD
Gas Line Trimmer

Model #25A-203L729 Official MTD high wheel trimmer mower

Here are the diagrams and repair parts for MTD 25A-203L729 high wheel trimmer mower, as well as links to manuals and error code tables, if available.

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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.

Owner’s manual

    Showing 10 of 47 parts

    Lawn & Garden Equipment Hex Bolt, 3/8-24 x 1-1/2-in#46

    Mower Diagram

    Lawn & garden equipment hex bolt, 3/8-24 x 1-1/2-in

    Part #710-1044
    BEST SELLER
    This item is not returnable
    In Stock
    $2.79 | 
    28% OFF 
    MSRP: $3.90
    Lawn Mower Handle Knob#12

    Mower Diagram

    Knob wing nut

    Part #720-0284
    Replaced by #720-04072A
    ?
    Manufacturer substitution
    This part replaces 720-0284. Substitute parts can look different from the original.
    BEST SELLER
    This item is not returnable
    In Stock
    $5.79 | 
    32% OFF 
    MSRP: $8.50
    Lawn Tractor Screw, 1/4-20 x 5/8-in#17

    Mower Diagram

    Lawn tractor screw, 1/4-20 x 5/8-in

    Part #710-1652
    BEST SELLER
    This item is not returnable
    In Stock
    $5.29 | 
    16% OFF 
    Phone Price: $6.29
    Lawn Mower Throttle Control Housing#6

    Mower Diagram

    Lawn mower throttle control housing

    Part #746-0883
    This item is not returnable
    In Stock
    $21.39 | 
    19% OFF 
    Phone Price: $26.39
    Lawn & Garden Equipment Saddle Washer#13

    Mower Diagram

    Washer

    Part #736-0451
    Replaced by #936-0451
    ?
    Manufacturer substitution
    This part replaces 736-0451. Substitute parts can look different from the original.
    This item is not returnable
    In Stock
    $6.39 | 
    14% OFF 
    Phone Price: $7.39
    Line Trimmer Extension Spring#38

    Mower Diagram

    Line trimmer extension spring

    Part #732-1022
    This item is not returnable
    In Stock
    $4.40
    Lawn & Garden Equipment Bell Washer#45

    Mower Diagram

    Bell washer

    Part #736-0452
    Replaced by #936-0452
    ?
    Manufacturer substitution
    This part replaces 736-0452. Substitute parts can look different from the original.
    This item is not returnable
    In Stock
    $3.13
    Lawn & Garden Equipment Flat Washer#23

    Mower Diagram

    Lawn & garden equipment flat washer

    Part #736-0182
    This item is not returnable
    In Stock
    $4.33
    Lawn & Garden Equipment Cupped Washer#24

    Mower Diagram

    Lawn & garden equipment cupped washer

    Part #736-0270
    This item is not returnable
    In Stock
    $3.49 | 
    22% OFF 
    Phone Price: $4.49
    Lawn & Garden Equipment Carriage Bolt#32

    Mower Diagram

    Lawn & garden equipment carriage bolt

    Part #710-0703
    This item is not returnable
    In Stock
    $6.29 | 
    14% OFF 
    Phone Price: $7.29

    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.