Where is the lawn mower belt adjustment? Need to tighten belt.

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.

Cathy, there is a way to adjust belt tension on some models whether it is by the cable or a slotted bracket where the idler wheel is mounted, depends on make and model. If you have your manual check in it for belt adjustment. Could be stretched belt, stretched cable, worn/oil on pulley, seized tensioner, stretched/broken spring on tensioner,etc.
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There is no 'adjustment ' to be made other than routing the belt correctly. The tension on the belt is made by the idler pulley which is spring loaded. If you can provide the model number of the mower, I will search for a belt routing and parts daigram.

There is an adjustment to tighten up the drive belt tensioner pulley. You should be able too see it after you remove the safety shield. Tighten adjustment nut to snug belt.

You don't tighten the belt, there is a idler pulley it's between the motor pulley and the blade pulley where the chute is.

This has a spring that keep tension on the belt, so either the spring is bad, or see if there is another slot for the spring to make it pull more, or you have the belt routing on wrong.

Your manual should show the belt track.

If you can't move the spring and the belt is correct, get a new tension spring.

And clean off that deck, LOL

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it is better to replace the belt then to tighten it

You will have to disconnect the deck from the tractor. There might be some rods hanging down by the pulley on the motor. You have to loosen those not remove. Then install the new belt with the inside of belt (V) into the pulleys. The outside of belt (flat side) goes up against any idlers (oversized pulleys). Once you get the belt routed properly the belt will be snug in the pulleys. If you have excess play you have to use trial and error to get the belt routed the right way around the idlers.
Once belt is on reattach the deck and tighten the rods by the motor that keeps the belt from comming off. They need to be close but not touching the engine pulley.

Good luck and let me know if this helps.

roundo4

If the belt is loose it may simply be worn out and need to be replaced. Look carefully to be sure that the belt didn't come off one of the pulley wheels as this might give it the appearance of being loose.

The way the belt tightener is engineered, there is no tightening to it, just spring tension. Get back and let me know where it is at. I know I can assist you in gettting to the bottom of this problem.