Record the model numbers and serial numbers, then contact the manufacturers of the pump and of the hoist. If they are still in business, they will likely send you their owners manuals for free.
It sounds like it could need a flow control adjustment or cleaning.
If you lift the bed a little with a load on it, and then lower it back down with a load still on it, does the lower faster?
Oil flow volume through a restriction is dependent on the oil pressure. An empty bed at a steep angle may not have much down force to push out the oil with much pressure until it is nearly all the way down. You need to keep enough resistance so you can still lower a fully loaded bed slowly enough not to damage anything. That's my thoughts, check with the manufacturers to be certain.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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