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Murray went out of business and was bought out by new outfit. Do not know if new Murray (kept the name) manufacturer will support the older products produced previously. You can always check and cross your fingers.
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 forward reverse pedal linkage needs adjustment. Remove mower deck pins and slide out of the way. Pull linkage pin out then turn clockwise one full turn .move brake pedal while looking at it .You should see a small brake disc on side of rearend with a nut bolt going through the disc. Pull rod on back of mower that allows you to push mower freely.set parking brake try to move mower by pushing if it moves with break set tighten bolt that goes through brake disc til mower don't move.release parking brake try to move mower should roll easy.if not losen bolt 1/2 turn til it moves easy.reengauge rod on rear of mower to drive it test and be sure to place cable ties on any thing under mower dragging ground .If test works .reinstall mower deck.
Gavin, the symptoms indicate that the intake valve is stuck open, it could be that the exhaust is also stuck, but normally when an engine sets up, only one stem corrodes and gets stuck. It matters little though which one is stuck, you will still need to have a valve job.
I am going to presume that this clutch actually installs on the lower end of the engine crankshaft. There should be a bolt that goes up thru the center of the clutch into the shaft. There's probably a spring or rod that will hold the outside of the clutch solid. Part of the clutch will be turning with the engine when it's running and when you throw the switch to engage the clutch, the other portion is activated by the current to connect to the turning portion.
To get the old one off, you'll need to get under the mower with a socket wrench. These can be quite stubborn to break loose, as the engine will want to turn over as you turn the bolt. If you have a gear drive machine you may be able to let the transmission help hold the engine from turning, but that, too, is run by a belt, so it may slip. Worse case is to use an air impact wrench, which will apply pressure so fast that it will make the bolt turn without turning the engine. Good Luck.