Most Yard Man mowers have two drive belts. The small one in the rear is usually the one that causes this trouble. If you didn't replace it that is probably your problem.
How to adjust brakes on a yardman lawn mower
The Yardman Series push mower uses a 21 inch blade.
With tools
I need a transmission belt diagram for a yardman MTD 1338
a rider will or an electric start will.
to get rear wheel off yardman mower
Perhaps it is the starter drive. That happened to my riding mower. Got the drive replaced, works fine.
Many riding mower don't have oil filters. If your's does it is on the side of the engine toward the bottom and probably on the left side as you sit on the mower.
mower manuls are at this link http://manuals.mtdproducts.com/mtd/DocGetter?doc=769-00533.pdf
how do you rout a belt for 42 inch master cut 13aj7955059
SAE 10w30 any major brand full synthetic.
You can change the drive belt, on your lawnmower, by loosening the tensioner pulley. With the tensioner pulley, loosen the drive belt will come off and can be replaced.