Ok so I just picked up a new truck for this season and Im having trouble with the dump bed. (Bought as is from dealer so no help there and the dealer is no help anyway, wouldnt do business with again) The body has a scissor hoist, single ram, electric over hydraulic hoist. power up gravity down. And thats the problem. It will go all the way up with no problem but after about 3/4 of the way up it wont come back down. It does eventually after someone jumps on the hoist while another holds the button down (i know, horrible idea) but what else can we do. Any one have any ideas as to what is causing this or how we can fix it?? Dont want to replace the whole system. Pump is fine. Any help is much appreciated, dont know much about these hydraulics myself.