How to Service an MTD Yard Machine Garden Tractor Starter

Introducing a procedure designed to assist owners in performing maintenance on the Starter Assembly of a 1997 MTD Yard Machine Garden Tractor Model 84A (840-series #14AS84AH062) 46" cut equipped with a 18.5hp Briggs and Stratton Twin-II I/C 42A700-series engine (Model #42A707).


This procedure serves as a reference to those service tasks necessary for removal, disassembly, servicing, and reinstallation of the machine's components.

Steps

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    Remove the tractor hood using the article described in the Related wikiHows section below
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    Remove the left-side panel. Again, use the article described below.
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    Remove the right side-panel from the mower.
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    Disconnect the battery cable, starting with the negative cable and finishing with the positive battery terminal cable.
    • Pull back the battery terminal protection-caps (if equipped) and, as each battery connection hardware is unique, disconnect the NEGATIVE(-) battery terminal cable using the necessary tool(s). Once the cable is disconnected, shield the terminal from making any accidental electrical connection.
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    • CAUTION! Use care in removing the negative battery cable especially when using tools not to allow contact with nearby metal as a direct-short will occur resulting in possible injury or death!
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    Detach the right-side wire harness. using a #2-Phillips screwdriver to remove the #10-1/2" machine tap-screw and the 3/16" flat washer holding the right-side (Wire Harness) Clamp to the top of the Blower Housing.
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    Detach the fuel line from the mower using a 3/8" wrench or ratchet/socket. The pieces you must perform this on, are the two machine tap-screws holding the (Fuel-Line) Clamps to the right-side Air Guide Cover.
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    Detach the oil fill tube using a 5/16" wrench or ratchet/socket is used to remove the two machine tap-screws holding the Oil Fill Bracket to the Blower Housing. Once both screws have been removed, lift the Bracket off the Tube's mounting tab.
    • CAUTION! The Oil Fill Tube is freely seated into the base of the engine Crankcase and is sealed with an O-ring. Take care that when removing the bracket that the tube is not allowed to come free of its seating else contaminants could possibly enter the engine's Oil Crankcase.
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    Remove the engine lift bracket. Use a 3/8" wrench or ratchet/socket to remove the tap-screw securing both the Engine Lift Bracket and the Blower Housing.
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    Detach and remove the right-side throttle cable. Use a #2-Phillips screwdriver to remove the #10-1/2" machine tap-screw holding the right-side wire harness clamp to the top of the Blower Housing.
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    Remove the engine shield hex-tap screws using a 5/16" wrench or ratchet/socket combination. These screws are located attach the Blower Housing to the left-side Air Guide Cover.
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    Remove the engine lift bracket, using a 3/8" wrench or ratchet/socket to remove the two hex tap-screws securing both the Engine Lift Bracket and the Blower Housing.
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    Remove the negative battery cable. The negative (-) battery cable must now be disconnected from its grounding point on the Blower Housing and removed using a ...
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    Remove the blower housing.
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    Remove the air guide cover.
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    Disconnect the starter cable.
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    Remove the starter assembly.

Tips

  • Work on surface areas that are clear of debris and obstructions in case parts or tools are dropped and can be easily found.
  • Attempt to use a workspace that allows access to the machine from all sides while it is being serviced.
  • SHORTCUT #02: Step #09 may be skipped prior to removing the Fender unit in step #11. In do so, it will take a slight-effort and patience to remove the Fender, working the Compression Springs through their respective openings.
  • SHORTCUT #01: Steps #02-#04 may be skipped if working in the tight-confinement required in step #07 is not an issue. Be aware that the carriage-bolts come into the Fender-mounting at a downward-angle which makes it difficult to manipulate a wrench.
  • After reassembly, starting of the engine may be difficult if fuel has been allowed to drain from the Fuel-Line and the Carburetor. Have a can of starting-fluid (Ether) handy to help get the Fuel-Line, Fuel-Filter, and the Carburetor primed.
  • Attempt to keep the work area clean and free of clutter.
  • Make use of Nitrile, Latex, or some type of work-gloves that will prevent fuel, oil, and contaminants from coming into contact with your skin.
  • Utilize a method for arranging, bagging, and tagging parts to insure proper reassembly.

Warnings

  • Gasoline is a highly-flammable liquid with a low flash-point! Adhere to all safety precautions when servicing the machine.
  • Prior to work: Insure that a fire extinguisher properly rated for flammable liquids is readily available in the work-area.
  • Gasoline is a Carcinogen and can be directly absorbed through the skin or inhaled! Use of Personal Protection Equipment (PPE) in correct working condition is highly recommended.
  • Perform service work only in a well-ventilated area.
  • Prior to work: Drain any remaining fuel from the tank.
  • Prior to work: Disconnect the battery terminals and insulate them from potential electrical discharges.
  • Prior to work: Insure that the unit is not hot and is cool to the touch.
  • Prior to work: Insure the work-area free of combustible materials.
  • Prior to work: Insure that proper safety equipment is worn at all times and is in good-working condition.
  • Adhere to and abide by all safety concerns and precautions specified by the OEM which takes precedence over this wikiHow.
  • Use only high quality unleaded-grade gasoline in this type engine to insure its top performance. Verify that the fuel is fresh, clean, and free of contaminates before using. Do NOT use Ethanol-enriched or any other alcohol-enhanced fuels in this engine.
  • While servicing the machine, especially in low-humidity, ensure that you are properly grounded to eliminate possible electrical static discharge.
  • Do not allow children or animals in or around the work-area.

Things You'll Need

  • Pliers: Regular
  • Screwdriver: #2-Phillips
  • Wrench: 7/16"
  • Ratchet and Sockets: 3/8" 1/2" 3/4"
  • Ratchet Extension

Sources and Citations

  • Briggs and Stratton Reference #M0300025 - Starter Reference Guide
  • Briggs and Stratton Reference #271172 - Twin Cylinder "L" Head Repair Manual
  • Briggs and Stratton Reference - Associated parts manual designated for the particular engine model.
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Article Info

Categories: Lawn Care