[quote=&quot;55Super88&quot;:1wbvmz9q]My Super 77 with the bosch pump hasnt been started in a few years. Of course I am worried about damaging thehydraulic head. I pulled off the timing window and the control unit and I am able to move the slotted plunger guide. Does this prove that the head/plunger will be free?[/quote:1wbvmz9q] you will get a quicker answer on the oliver site on yesterdays tractor. chuck