Mowing unlevel mower is brand new

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.

Have a look underneath while someone operates the height adjustment. There's probably a link arm come off which does deck height. Go to google images for this machine, type height adjustment and look at the pictures if you don't have a handbook. Google JD handbooks and see if you can find a free download.

There should be an adjustment on both sides of the deck. Move the nut up or down to raise of lower it.

Hi there, If you lower the deck to its lowest level and follow the track of the deck belt you'll see the tensioner pulley. Check its spring is still engaged and strong enough, some mowers let you hook the spring into different holes for more/less tension. Check the pivot bush isn't too slogged out for it to tension properly.

couldn't hurt to try but some cheaper mowers don't have a drain plug look on a parts break down on sears parts online but check the belt tension first

Find a level surface (concrete garage floor for example) ... adjust front to back ... use a tape meadure to mneasure floor to deck edge ... then adjust side to side.

If you have the owners/operators manual that came with the mower, it will have instructions on how to LEVEL the mower deck. That sounds like your problem. Deck wheels would greatly help also by stabilizing the deck so it doesn't bounce and "float" so much while mowing.

It sounds like your mowing deck is too close to the ground. Can you adjust the blade height with a lever? I have a Craftsman riding mower, my deck height is adjusted manually with the use of a locking level shifter, be sure yours is set to the proper minimum height and this will eliminate driving the blades into the turf.

check your front tire air pressures

Had same uneven mowing problem with new Toro Z4200 XTR mower. Problem was one side of the U-shaped rear deck hanger rod had popped out of its chassis mount (did hit something with mowing deck). Removed hanger chassis mount & its bolt. Put end of U-shaped rear deck hanger rod back in the chassis mount and remounted hanger chassis mount & its bolt. Z4200 now cuts lawn evenly again.