December 1, 2015

How to replace a snowblower stop switch

By Lyle Weischwill
How to replace a snowblower stop switch

This DIY repair guide gives instructions for replacing the stop switch on a snowblower. The stop switch prevents the engine from starting until you insert the key, and it stops electrical current to the spark plug when you remove the key. Replace the snowblower stop switch with the manufacturer-approved replacement part if the engine runs without the key or if the switch prevents the spark plug from sparking with the key inserted.

This repair procedure works for Craftsman, Bolens, MTD, Troybilt, Huskee and Yard Machines snowblowers.

Quick links
Tools required
Work gloves
Phillips screwdriver
Slot screwdriver
Needle-nose pliers
Wrench set
Socket and ratchet set
Repair difficulty
Time required
30 minutes or less
Repair difficulty
Time required
30 minutes or less
Replacing a stop switch on a snowblower

This video shows how to replace the stop switch on a snowblower.

Instructions

  1. 01.

    Disconnect the spark plug wire

    Pull the spark plug wire up and off the plug.

  2. 02.

    Remove the electric starter switch

    Remove the mounting screws and pull the starter switch off the bracket.

    Let the starter switch hang by the electrical cord.

    Remove the electric starter switch.

    Remove the electric starter switch.

  3. 03.

    Remove the engine shroud

    Remove the key.

    Pull off the choke and throttle knobs.

    Remove the acorn nuts that secure the carburetor to the engine.

    Remove the muffler shroud mounting screws.

    Work the engine shroud off the carburetor mounting studs to access the back of the stop switch, leaving the primer hose and breather hose connected.

    Remove the key.

    Remove the key.

    Pull off the throttle knob.

    Pull off the throttle knob.

    Remove the choke knob.

    Remove the choke knob.

    Remove the acorn nuts.

    Remove the acorn nuts.

    Remove the muffler shroud screws.

    Remove the muffler shroud screws.

    Pull out the engine shroud.

    Pull out the engine shroud.

  4. 04.

    Remove the stop switch

    Disconnect the stop switch wires.

    Press in the stop switch locking tabs and work the stop switch out of the engine shroud.

    Disconnect the stop switch wires.

    Disconnect the stop switch wires.

  5. 05.

    Install the new stop switch

    Push the new stop switch into the engine shroud.

    Reconnect the stop switch wires.

    Push the new stop switch into the shroud and reconnect the wires.

    Push the new stop switch into the shroud and reconnect the wires.

  6. 06.

    Reinstall the engine shroud

    Pull off the muffler shroud before reinstalling the engine shroud.

    Remove the belt cover mounting bolts and pull off the belt cover.

    Remove the bolts from the red chute support bracket and pull the support bracket forward, releasing the control rod from the 4-way control rod receiver.

    Remove the front muffler shroud mounting bolts.

    Release the wire control cables from the retainer clip and pull off the muffler shroud.

    Pull the breather hose off the rocker cover and reconnect the breather hose to the fitting on the engine shroud.

    Align the choke knob shaft and the 2 carburetor mounting posts with the openings on the engine shroud and work the engine shroud onto the engine. Make sure that the breather hose passes through the opening and lines up with the rocker cover breather hose fitting.

    Slide the breather hose over the rocker cover fitting and secure the hose with the clamp.

    Reinstall the 2 acorn nuts to secure the engine shroud to the engine.

    Slide the wire control cables into the retainer clip and position the muffler shroud on the engine.

    Reinstall the muffler shroud mounting bolts.

    Push the control rod back into the 4-way control rod receiver and line up the support bracket with the mounting holes.

    Reinstall the bolts in the red chute support bracket.

    Reinstall the belt cover using the mounting bolts.

    Reinstall the choke and throttle knobs.

    Tip: Removing the muffler shroud is necessary because the engine shroud fits under the bottom lip of the muffler shroud. You can remove the engine shroud without removing the muffler shroud but the muffler shroud must be removed for reassembly.
    Remove the belt cover bolts.

    Remove the belt cover bolts.

    Remove the belt cover.

    Remove the belt cover.

    Remove the chute support bolts.

    Remove the chute support bolts.

    Release the control rod.

    Release the control rod.

    Remove the muffler shroud bolts.

    Remove the muffler shroud bolts.

    Release the control cable.

    Release the control cable.

    Remove the muffler shroud.

    Remove the muffler shroud.

    Reinstall the muffler shroud.

    Reinstall the muffler shroud.

    Reinstall the control rod.

    Reinstall the control rod.

    Reinstall the chute support bracket.

    Reinstall the chute support bracket.

    Reinstall the belt cover.

    Reinstall the belt cover.

    Reinstall the choke knob.

    Reinstall the choke knob.

  7. 07.

    Reinstall the electric starter switch

    Position the electric starter switch on the switch bracket and reinstall the mounting screws.

    Reinstall the starter switch.

    Reinstall the starter switch.

  8. 08.

    Reconnect the spark plug wire

    Reconnect the spark plug wire.

  9. 09.

    Reinstall the key

    Push the key into the slot.

    Insert the key.

    Insert the key.

Warning: Undertaking repairs or maintenance to appliances or power equipment can be hazardous. Should you choose to undertake repairs or maintenance, you are assuming the risk of injury to your person or property. In an effort to reduce the risk, use the proper tools and safety equipment noted in the applicable guide and follow all instructions. Do not proceed until you are confident that you understand all of the steps and are capable of completing the repair. Some repairs or maintenance, however, should only be performed by a qualified technician.

Symptoms for gas snowblowers

Choose a symptom to see related snowblower repairs.

Main causes: snow build-up in chute, chute drive mechanism failure, bad chute control assembly
Main causes: broken shear pins, worn or loose auger drive belt, auger drive cable failure, damaged auger, bad gear case
Main causes: stale gas, clogged carburetor, clogged or broken fuel line, dirty spark plug, bad rewind starter, incorrect valve lash
Main causes: clogged chute, snow build-up in auger housing, broken auger shear pins, auger drive belt needs adjustment, auger cable problems
Main causes: punctured tire, damaged rim
Main causes: dirty carburetor, clogged fuel filter, dirty spark plug, incorrect valve lash, leaky engine gaskets
Things to do: replace the spark plug, change the oil, rebuild the carburetor, adjust valve lash, adjust or replace the belts
Main causes: dirty carburetor, stale fuel
Main causes: loose drive clutch cable, damaged drive clutch cable, worn friction disc, scraper blade scraping the ground, engine problems

Repair guides for gas snowblowers

These step-by-step repair guides will help you safely fix what’s broken on your snowblower.

December 1, 2015
By Lyle Weischwill
How to adjust a snowblower valve lash

Adjust the valve lash on your snowblower engine to keep the engine running smoothly.

Repair difficulty
Time required
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How to replace a snowblower chute control gearbox assembly

Replace the chute control gearbox on your snowblower if it's stripped or damaged.

Repair difficulty
Time required
 30 minutes or less
December 1, 2015
By Lyle Weischwill
How to replace a snowblower spark plug

You need a spark to fire up the engine of your snowblower, and that spark comes from a spark plug. You can replace one in minutes.

Repair difficulty
Time required
 15 minutes or less

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Use the advice and tips in these articles and videos to get the most out of your snowblower.

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