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.
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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
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On a 7hp Yardman mower, the oil plug is typically located on the side of the engine, often near the base or the crankcase. It usually has a dipstick attached, which helps you check the oil level. To add or change oil, you would unscrew the plug or dipstick, depending on the design. Always refer to the owner's manual for specific instructions related to your mower model.
SAE 10w30 any major brand full synthetic.