i need some kind of valve.

[Espeefan]

Something to think about.....

With a single acting hydraulic cylinder, you'll have to find a way for the oil to flow back to the tank, once you are ready to lower the dump box. If you simply T off the pressure line to send oil to the hoist cylinder, the pump will have to be stopped in order for the box to lower back down. Depending how good your hydraulic pump is, the oil might take a really long time to flow through the lines and back into the tank, when going this route. All pumps have some slippage, which is basically how much oil gets past the gears and doesn't get pushed out the hydraulic lines. The poorer the pump tolerances, the easier the oil will flow through the pump and back into the tank, as gravity is pulling the dump box back down. If the pump is a high quality unit, with good tolerances, the oil might very well get trapped, in which case you'll be stuck with having to run your pump in reverse to draw the oil back out of the cylinder. That may or may not be a good idea, depending how your system is plumbed.

On the cheap, and manually, what you could do is split the hydraulic line that supplies oil to the hoist cylinder, with a T fitting, and have one small needle valve, pinch valve, or ball valve in each line. Open one valve to fill the hoist cylinder and dump the box, then close it and open the other needle valve to release the oil from the cylinder and route it with the other hose back to the tank, bypassing the pump. Basically venting that line back to the tank. Doing it this way, your pump could run continuously, if you wish.

Manual miniature valves could prove expensive and hard to find though. Considering you can purchase a single hydraulic spool valve for about $100, you might want to keep that in mind as you shop for a couple manual valves. Good ones can get expensive.

Something along these lines might be helpful. It's a pneumatic valve, but might very well work okay for hydraulics. Kind of big, so if space is tight, it might not be a good option.

http://www.mcmaster.com/#48965k24/=ryz37b

[cosworth34677]

Originally Posted by Espeefan

Something to think about.....

With a single acting hydraulic cylinder, you'll have to find a way for the oil to flow back to the tank, once you are ready to lower the dump box. If you simply T off the pressure line to send oil to the hoist cylinder, the pump will have to be stopped in order for the box to lower back down. Depending how good your hydraulic pump is, the oil might take a really long time to flow through the lines and back into the tank, when going this route. All pumps have some slippage, which is basically how much oil gets past the gears and doesn't get pushed out the hydraulic lines. The poorer the pump tolerances, the easier the oil will flow through the pump and back into the tank, as gravity is pulling the dump box back down. If the pump is a high quality unit, with good tolerances, the oil might very well get trapped, in which case you'll be stuck with having to run your pump in reverse to draw the oil back out of the cylinder. That may or may not be a good idea, depending how your system is plumbed.

On the cheap, and manually, what you could do is split the hydraulic line that supplies oil to the hoist cylinder, with a T fitting, and have one small needle valve, pinch valve, or ball valve in each line. Open one valve to fill the hoist cylinder and dump the box, then close it and open the other needle valve to release the oil from the cylinder and route it with the other hose back to the tank, bypassing the pump. Basically venting that line back to the tank. Doing it this way, your pump could run continuously, if you wish.

Manual miniature valves could prove expensive and hard to find though. Considering you can purchase a single hydraulic spool valve for about $100, you might want to keep that in mind as you shop for a couple manual valves. Good ones can get expensive.

Something along these lines might be helpful. It's a pneumatic valve, but might very well work okay for hydraulics. Kind of big, so if space is tight, it might not be a good option.

http://www.mcmaster.com/#48965k24/=ryz37b

well im using the magom hrc pump, and in my other trucks it will lower the bed with the weight of the bed. so if i run the pump backwards that is bad? they don't have a direction noted on there pump.