hi all,we're trying to do up my old zetor so i can donate it to a charity. its been stored under cover for last 10 years or so and we've got it running but cant get the arms to lift. iv'e tried every which way with hi/low lever,pto in gear and out,pto 540/1000 in all positions and hydraulic speed response lever. the lever is moving the shaft its connected to and not slipping. i would be very grateful if any of you guys have an easy. quick and cheap way to remedy this. the pump is working as external supply is flowing and we topped up gearbox oil yesterday.