ok ... before some smart@#$ responds - I had not had a beer yet.
I have had it happen before while it was running - but I am sure it moved a little (and I thought it went up) just after I had turned it off. I'll chaulk it up to old age (mine) and leave it as that.
Now now calm down just a little frendly digging going on. I myself drink my beer while I am running the tractor.........I thought that was why they installed the beer holder on the fender heck that was the largest selling point for me!
I know you guys are I must admit that ever since I changed the hydraulic fluid to a synthetic blend it seems to be a little too thin in the hot weather - but works excellent uphere when it is minus 40 degrees. I'll just have to stop working and start drinking more on the hot days!
it's an internal leak in the lift circuit.. most usually from fluid leaking past the 3pt piston back into the hyds sump.. after it leaks a lil, the circuit regenerates if it is a position control feedback system.
It is possible for it to appear to go up, after first coming down. Lots of times, there is mechanical hysteresis, and a "pop" or "thud" will be heard when it drops, and after it drops, a bit of momentum pushed the tires down in the back, lightens them in the front, and as the stored energy in the tires and the linkages recover, it will go up.
The best solution for the problem is to not put a beer on a bushhog.