Murray Select Model # 405000X8 trong vibration when I engage mower deck. Also can't keep deck even.

SOURCE: Knocking in mower deck or belt clutch when engaging blades, motor bogs / slows down

YOU MAY HAVE A BENT BLADE OR EXESSEIVE BUILD UP UNDER THE DECK

SOURCE: need parts for old murray rider mower 36 in

If you send me your email address I will send you a PDF file of the parts for your mower

m o w e r m a n 1 at h o t m a i l dot c o m

Use correct format and without the spaces

SOURCE: deck trouble with a murray 40: cut mower

A hanger may have come loose from the deck that needs to be reattached.
Plus check your tire pressure, one tire with less air than the other will make it cut lop sided.

SOURCE: how do i level the deck on a murray riding mower

Park the tractor on a firm, level surface. . .
At the lower end of the lift/lower travel slot, there should be a plastic cover which you pop up so that your blade lift handle goes all the way down (it should say something about blade level on there somewhere. . . . .
After you have the handle in this position, look at the front lift arms of the mower deck and find the 2 large wing nuts, one on each side. . . . .
Loosen these while the deck is down and then retighten them Your deck is now level

SOURCE: how to adjust the mower deck on my murray rider,

Park the tractor on a firm, level surface. . .
At the lower end of the lift/lower travel slot, there should be a plastic cover which you pop up so that your blade lift handle goes all the way down (it should say something about blade level on there somewhere. . . . .
After you have the handle in this position, look at the front lift arms of the mower deck and find the 2 large wing nuts, one on each side. . . . .
Loosen these while the deck is down and then retighten them Your deck is now level and will lift to its highest recommended position when you raise the lever