Dump trailer hydraulics

[1gr8bldr]

I had asked on this forum before, my dump trailer does not want to raise fully. It gets really slow towards the top. It has no way to tell about the fluid level. I have disconnected the line and added fluid. It could not have enough, have to much... or need rebuilding, I don't know. Last time I asked, responses were for pics. Here is a pic;

 

[1gr8bldr]

http://www.tractorbynet.com/forums/...-top-dump-trailer.html?highlight=Dump+trailer

 

[1gr8bldr]

Another view;

 

[George2615]

Assuming that's the factory pump your fluid reserve tank is probably low. There should be a fill port on the tank.
There is a possibility the tank may be too small if you have ever replaced the cylinder with a larger diameter cylinder with a long stroke.
When I converted my manual hyd. tilt trailer to a power tilt I bought a hyd. power unit similar to yours and replaced the round tank with a larger square tank.

 

[1gr8bldr]

Assuming that's the factory pump your fluid reserve tank is probably low. There should be a fill port on the tank.
There is a possibility the tank may be too small if you have ever replaced the cylinder with a larger diameter cylinder with a long stroke.
When I converted my manual hyd. tilt trailer to a power tilt I bought a hyd. power unit similar to yours and replaced the round tank with a larger square tank.

The guy I bought it from said that occasionally he added to it. But he said it only took a thimbal full. It was leaking at the time. I fixed the leak but have no way of knowing how much to add. I would consider plumbing in a relief valve, overfilling and let it spray out... If that would work?

 

[1gr8bldr]

Does anybody know that pump ??? Hal_dex??????

 

[1gr8bldr]

It is a Haldex. Looking at other Haldex pics, it seems to be plumbed wrong. It looks like it has a hose connected where it should have a filler/ breather cap

 

[Leejohn]

If the cyl's are all the way closed, I don't think you can over fill.

 

[1gr8bldr]

If the cyl's are all the way closed, I don't think you can over fill.

Are you saying to lower the bed and fill full. This would be hard to do because the bed covers the unit,,, but I could figure out a way

 

[gengine]

I wouldn't lower the bed and fill all the way up, as you are using it, the Hyd. fluid gets warm and expands, which will result in the brown gold laying in the dirt. Bed down, 3/4 full should be plenty. If you need a little more, then try it, but you have to have some expansion room. If the last owner put the pump on, the reservoir may be undersized for the ram.

 

[gengine]

The hose with the hose clamp is not a pressure hose, and that is where your breather should be, which is also the filler cap. Where does that hose run? maybe it was a way for the last guy to fill the reservoir remotely with the bed down?

 

[George2615]

Are you saying to lower the bed and fill full. This would be hard to do because the bed covers the unit,,, but I could figure out a way

Is your trailer power up / power down or power up / gravity down?
I only see one relay in your pic so guessing it a power up only unit.
If it is power up / gravity down then you don't need that extra hose going back to the tank. Fluid will return through the pressure up hose when the handle (or pressure release) is set to lower. Remove and plug the cylinder where that hose goes.

 

[jenkinsph]

I would think the reservoir only needs to hold enough to displace the cylinder rod when fully raised, most of these cylinders are double acting with the fluid on both sides of the piston. If it were me I would add a small amount at a time to prevent a big spill.

 

[Halftrack]

The 2 hoses confuse me. Is it a double acting cylinder and the clamped on hose is attached to the top side of the cylinder as an additional reservoir? If that is the case, shouldn't he be able to raise the bed, and then add fluid via the clamped hose connection, run it up some more, add more until he reaches the full dump position. Huh?

 

[1gr8bldr]

There is a hose going to each end of the ram, I think, but for sure both hoses go to the ram.

 

[1gr8bldr]

The hose hookup on the lifting end of the ram has a clamp like the clamped one on the pump

 

[1gr8bldr]

Is your trailer power up / power down or power up / gravity down?
I only see one relay in your pic so guessing it a power up only unit.
If it is power up / gravity down then you don't need that extra hose going back to the tank. Fluid will return through the pressure up hose when the handle (or pressure release) is set to lower. Remove and plug the cylinder where that hose goes.

Not sure. It has a button. up and down on the hand held... but not sure if it is gravity. How would I know? If I release the down button, it stops

 

[George2615]

The hose hookup on the lifting end of the ram has a clamp like the clamped one on the pump

That's an accident waiting to happen. If that hose clamp lets go and the hose blows off the cylinder the box will come down real quick.

 

[Halftrack]

I think we need a photo of the cylinder and a plumping diagram of the hoses to get a full understanding of his system.

 

[1gr8bldr]

Here is another pic. It shows the hose with a clamp at the top