LT15 wide sawhead tilt

[lazyflee]

My saw head keeps getting out of whack. I adjust the tilt so it's level with bunks and after a few logs I notice the cants are off a bit (trapezoid). Yesterday I cut all day and the outside dropped about 1/4", today I leveled it, cut two cants and the outside dropped 1/8". Anyone ever have this problem? Anyone know what causes it? Anyone know how to fix it? 

[lazyflee]

As suggested by Beenthere, a little more info. Rails, bunks are flat and level so I don't think that is the problem. I've been using the tilt adjust nut on the operator side to get the blade back to perpendicular to the bunks. Went into the manual and saw to check the clearance of the wheel on the mast, it was caked in pitch and pretty tight. Cleaned and adjusted but may have to wait to mill, winter storm warning here.

[offrink]

Take a sharpie and make a line on your adjustment nut. Make a cut or two and look to see if it is backing off. 

[ACman]

If its flat and level i'd be looking for something loose. I looked at the wide online and see it has 2 rails thd head rides on. I would ckeck those bolts holding the rails on. Or maybe the bearings the head moves up and down on or the ones that are riding on the rails.

[lazyflee]

Thanks for the ideas! Will try those as soon as the storm stops.