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Safety and Preparation
Serious injury can occur if the engine or mower blades accidentally start while you are working with lawn tractors. To prevent this, drive the Murray lawn tractor onto a flat work surface and disengage the mowing deck cutting blades. Engage the parking brake to keep the mower from moving; chock the wheels with a wooden block or brick. Adjust the mowing deck to the lowest position. Turn off the engine and remove the key from the ignition. While not necessary, you may even wish to disconnect the spark plug wire from the spark plug.
Mowing Deck Removal
You must remove the mowing deck on a Murray lawn tractor to gain access to the belts. Remove the adjustment rod hairpins, followed by the adjustment rod pins from the front left and right sides of the mowing deck. At the rear on the left and right sides, pull out the retaining hairpins and slide the mowing deck suspension links from the adjuster plates to separate the rear mowing deck from the frame. Remove the blade control rod stud, including the hairpin and washer, from the top of the blade control lever shift linkage at the left rear of the deck. Remove the front hanger rod, including the hairpin and flat washer that hold the rod in place. Loosen the belt guide retaining bolts with a socket wrench and remove the engine stack pulley belt so you can slide the mower deck out from under the tractor
Transmission Drive Belt Installation
Slide the new transmission drive belt between the engine stack pulley belt guides, over the belt guide plate and under the engine stack pulley. Fit the transmission drive belt around the top engine stack pulley. Push the free end of the transmission drive belt up through the transmission shifter hole in the lawn tractor floorboard. Slip the transmission drive belt loop over the transmission shifter. Pull the transmission drive belt down through the transmission shifter hole. Fit the transmission drive belt around the transmission drive pulley and tighten the transmission drive pulley belt guide retaining bolts to hold it in place. Fit the transmission drive belt flat side around the idler pulley. Slide the idler pulley onto the idler pulley stud while holding the belt in place. Tighten the transmission idler pulley retaining nut with a socket wrench to secure the idler pulley to the idler pulley stud.
Mowing Deck Drive Belt Installation
Pull back on the right side mowing deck mandrel pulley spring-tensioned belt retainer. Guide the new mowing deck drive belt around the right side mandrel pulley and release the belt retainer. Pull the drive belt spring-tensioned retainer away from the mowing deck idler pulley, guiding the deck drive belt around the idler pulley. Fit the mowing deck drive belt around the left side mandrel pulley and under the rear mowing deck cross link rod between the right and left side mandrel pulley. Slide the mowing deck under the right side lawn tractor frame, reconnecting the deck to the frame in reverse order of removal. Engage and disengage the mower deck while driving the mower to test the belt for proper operation.
The engaging of the mowdeck is cause an excessive demand of your engine. From that, we can assume your problem is in the deck. Since the power drive is all about belts and it threw the belts, from your information I can only deduce that either an object (stick-wood-rock) has wedge into a position that has stopped rotation of the blades. Also, each blade has a pulley/spindle. These have bearings which must be free to rotate. A bearing failure or seizing can also cause the problem you report.
Follow safety rules in your manual to insure the engine cannot start. Attempt to rotate each blade to check for free rotation. If the do not you most likely will need to remove the mower deck and check further. An obstruction or seized spindle should be easy to determine and sit repair is easily possible.
start by disengaging the blade and putting the deck to it's highest position, prior to attempting to start the mower inspect under the mower deck making sure there is no Debee wedged interfering with the blade rotation, check your spindle's for play and inspect your mower and drive belts. once complete than give it a try. if by chance it does start but turns over you more than likely sheered the flywheel key.
The engine wont have an impact with the deck because its belt driven. It sure sounds like you have a bad set of spindle bearings,just turning it by hand you wont hear any noise it has to be going fast to hear it. The noise may be coming from your clutch instead of the deck,and it sounds like the deck. Have these things checked out.
I am not sure what time of lawn mower this is, but if the blade is directly tied to the motor, usually the belt will just slip if not, but if this is directly connected to motor, it might have jumped timing. If this is not the case, inspect under the mower deck, and determine if there is something jamming the blades against the deck or if their is something bound around the blade, this can cause more strain on the motor, which could result in the symptoms your experiencing.
sound like timing is off sherd a key in flywheel
take cover off where you pull the rope and then
take off nut off flywheel its going to be tight and hard to get off but can be done take a screwdriver to hold flywheel ones the nut off look around shaft see if flywheel key is sherd
or pry off flywheel be carefull dont damage anything if sherd replace key
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