Murray 14.5 hp lawnmower/is there a adjustment for motion belt i put a new belt on and it want pull. like its still slipping, is there a tension adjustment? thanks for any help.

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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.

Your owner's manual should tell you

Try this site to get your manual and see if the exploded parts diagrams help

make sure it is the right belt should not haveto adjust

check the tension of the drive belt sounds like the belt is slipping also check it for oil if you have a oil leak and the oil got on the belt that will make it slip as well

if you have the belt installed correctly, the idler pully is the only adjustment and thats automatic. i trust you have installed the correct belt.

It may be the belt is stretched and need to be replaced.
Plus is the idler pulley putting tension on the belt, there may be a spring missing that hold tension on the idler pulley. Have you had the wheels off and forgot to put the square keys back in the axle. Unless the pulleys are loose you may have to go into the transmission.

The simplest way, is to take hold the belt, with the tension from the engine pully/clutch mechanism, then to follow the shape around the rest of the cutter mechanism. (You don't have to worry which direction the belt travels,)
Bearing in mind, the tensioner direction.
Then, you will see the correct route, very quickly:)
Hope you can manage, with that.

I need your model # took look it up , I am a Murray dealer.
The thing to rember there are two kinds of idler pulleys flat idlers that ride on the back side of belts and v pulleys that ride inside the belt . wont be back to the shop until the feb 10.
good luck