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If you have no forward, no reverse but the motor is still running normally the most likely reason for this is the main drive belt. This connects the motor to the transmission. If it stretches, breaks or drops off the drive pulleys you will lose all movement.
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.
I think theres 2 flow paths forward and reverse try checking the fluid level you may have to lower the rear end out of the machine or most all ridders ive seen allow you to take the backing plate off and then block the rear tires off the ground the fluid level should be about and inch from the top of the threads... if yours has a resivor off to the side with a breather fill it to the bottom of the threads... now that the fluid is full and up on blocks or jack stands start the engine and at an idle put it all the way forward to flush the bubles out this has to be done in small chunks 5 minutes forward and then laiter go 10 back let sit for 20 minutes in between and check the fluid level a couple of times to see if it whent down from this... best of luck hope this helped
when you took off the bag did you pull the lever that allows you to push it around the one that puts the hydro drive in neutral its on the back a couple inches away from the eyelet you can tow with it should be released forward
Does it have gears or a hydrostatic (automatic) transmission?
If it's a gear model, sounds like a loose drive belt.
If it's hydrostatic, it could be a belt problem or a problem inside the transmission. If it's a tranmission problem, this is not good. Many of the transmissions on riding lawn mowers are not serviceable - they are just replaced.
a hydro uses a foot pedal on the right side , you push forward to go forward or rock the pedal rearward to go in reverse - a regular transmission has a shifter usually between your legs for reverse 1st 2nd or 3rd gear - you also said the blades wont engage . are they electric ( with a switch ) or do you manually move a lever .
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