Deck height adjustment

[KWA520H 2]

I have a 1995 Toro Wheel Horse 520H.I have the rear deck wheels up all the way,but deck still at same height.It's scalping spots on my lawn.Is there any other places I can adjust to correct this.Or is something broken?Using the lever to move it up or down doesn't allow for an accurate adjustment.Every time the mower is shut off the deck goes back down and setting is lost.

[daveoman1966 3,745]

You have the deck mounted correctly?...   If the 'yoke' doesn't engage the small rod, it will flop around on the lift/height adjuster.

[oldlineman 1,481]

When you say you have rear deck wheels up all the way do you mean they are lowered down all the way, because up all the way will lower the deck to its lowest cut setting.