zetor 5611 lift stuck

[greendragon3]

hello everyone , bit of a brain teaser , my 5611 was on its maiden voyage after a full restoration the other day and the lift went up to its full height and now it wont drop at all , i have tried everything , any suggestions ??

 

[Renze]

is the D-M-P lever in D ? It should be in P. But if something is stuck, trying different DMP positions and pushing on the toplink bracket might free things up