Hydraulic system for a Dump Trailer?
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Re: Hydraulic system for a Dump Trailer?
Re: Hydraulic system for a Dump Trailer? -- rdvrs	Post Reply	Top of thread	Forum

Posted by: randykimball ® 12/03/2006, 09:36:40 Author Profile eMail author Edit

Ron, If you use a "three way" valve you would be able to power the cylinder in both directions and simply add hydraulic oil to the tractor's tank after the cylinder has been completely cycled a few times to purge all the air. As you know you would need quick change couplings in the lines where you want to uncouple the trailer and hydraulics. Of course you would need to make sure these couplings were "spick and span" before you attempted to couple them each time. If the tank on the tractor is small you would want to slowly extend and retract the cylinder the first time and add hydraulic oil as the volumn in the tank goes down to avoid sucking air into the pump. After that the fluid level in the tank should be fairly constant except for the difference in the volumn of the size of the cylinder ram on the retract side. In other words the volumn in the tank would be higher when the cylinder is retracted than when when extended by the volumn of the ram size (ram is the smooth rod that extends out of the cylinder and it must be kept scar/damage free). I'm guessing that the ram is likely about 1" in diameter. This means the ram has an area of about .78" x 24" (if the travel is actually 24"), this means the tank would have just under 19 cubic inches more fluid at the fully retracted position. This comes out to about .0816 gallons, or just over a cup and one half. A three way valve can be purchased from most any commercial supply house. The three way valve lets you be in the following positions... a. no action b. pressure to extend side and return the retract side to tank c. pressure to retract side and return the extend side to tank ..thus we call it three way... you have seen these at the controls of a fork truck. The three way valve has a port for the pressure from the pump and two returns on one side. Then on the other side will be two ports, one for each side of the cylinder. You would plumb both returns together to the return (tank) side of the tractor system. ... no big deal, if you are this far, you can handle it. The worst suggestion of your lifetime may be the catalyst to the grandest idea of the century, never let suggestions go unsaid nor fail to listen to them. Modified by randykimball at Sun, Dec 03, 2006, 10:07:37

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