HFfarms would it stay up before that line blew?? If it did cylinders would seem to be OK. Most of them have metering on the way down and in a spot where a blown hose wouldn't let it fall,because it will bend your frame when it hits. You should be able to let your loaded bed down regroup and spread some more without any danger to your frame. A new to the fleet truck came in the crew got it load locked and when it fell put two sickening puckers in the frame.
The bed has always done this since I've had the truck. In full upright position, once the PTO is disengaged, the bed slowly drifts back to the down position. It is slow though, taking 10 minutes or so to fully lower. Disengaging the pump allows the bed to return down at normal speed.
The control valve should have a check valve built within, that would be my first thought of not holding pressure, the oil could be bypassing internally within the cylinders but the control check or worn valve spool would be more common.
This was my current thought. Any advice on location of this valve? Is it the piston valve attached to the main engagement lever below? If so, I did discover today that the lever extension was contacting the frame and once removed, allowed the piston to close/seat completely as shown in the photo. Before you could still see 1/4" of the piston sticking out. Maybe that was the root of the problem and its just this simple fix? Also discovered a grease zirk I didn't know existed just below this that was obscured by decades of grime.
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Neverminded the seemingly leaky pump. Its just leakdown from the main fittings from detaching the hydro lines. The pump itself has never leaked to my knowledge.
I was under the truck tearing down the diff today and took a look at the pump again. Due to the design, it really isn't possible to drop the pump from the truck without cutting off the welds that hold the reservoir to the frame. Although the pump is bolted to the reservoir supports, the fittings between the reservoir and pump are large and in a spot where no wrench can get to them due to the crossmember that the apparatus is mounted directly behind. Seems like a poor design.
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