wet kit for lowboy????

[Oliver182]

Have my truck set up with a wet kit for my end dump trailer. The way i understand it is a end dump requires more flow(20-25gpm) but lower pressure(2100psi). Hooked truck up to lowboy trailer and it wont lift a heavy load. Called kaufman and they said i need 3000psi and lower flow,like 10gpm tops. What is going to be a good solution to this? Called local truck shop that set up my truck in the first place and they estimated 4000$ to get it set up. That seemed rather high to me. One guy suggested checking out the pump to see if it had a set screw that would adjust the pressure. That would get me a higher pressure but would have to remember to back it off for my end dump so i dont blow out the cylinder. Raining now or i would see if my pump had the adjusting screw. Any other ideas other than just buying a pony motor set up? thanks

 

[06Pete]

I have set up a few just using the dump pump just let it idle when using the lowboy. One of them after many years you have to speed up the truck to lift my 320 but the rest it still lifts at idle it is just the pump wearing out. Also when you hook up the pump you want to use the third line on the pump so it will bypass the extra flow back to the tank you need a little piece to put in the pump before you hook this line up any good hyd shop will know what it is make sure this line goes right back to the tank or through a return filter then the tank. You just use the pressure line right to your lowboy and then hook up the return back to your tank. The last one I did cost about $800 with a new pump and return filter and the lines I did the labor. That pump was rated at 45 gpm @1800rpm it works fine never had over heat problems but I do cut the pto off after I detach.

 

[Oliver182]

Maybe i didnt understand your post but what are you doing about the pressure issue? East says 3000psi will blow the seals out on my dump trailer but lowboy requires 3000psi to lift anything.

 

[mitch504]

There are selectable remote mounted relief valves available, so that you won't have to hook up a guage and crawl under the truck to change from job to job.

 

[johndeere123]

I use an end dump with my truck and my pump is set to 4900psi. As long as you don't let your end dump dead end it should not be an issue.

 

[06Pete]

I don't know what my pump is set at but it was sold as a dump pump. At idle I doubt it has more than 2000 psi as said above as long as the dump does not bottom out with your foot to the floor I doubt any seals will blow. That is how I have done it and it works for me maybe with drivers that don't care it might be a problem.

 

[Randy88]

I've done the same thing as 06 Pete, after we set the truck up, we then adjust the pressure relief on the trailer so it lifts the load we need it to lift. You have two different systems being run by one pump, when you have the dump trailer line in use, it puts out more volume and less pressure, when you hook it to the lowboy, it puts out less volume and more pressure, its done with valving and the use of different circuits. You need to chat with a hydraulic expert near you that can help you set it up right. The dump portion can run at any speed, the lowboy circuit needs to only run at idle if you plan on doing it with one pump on the truck.

I don't know how often or how long at any one time you plan on running the lowboy circuit, but this is pretty common with most contractors who use it as needed, if your going to use it hours on end days at a time and don't want to climb into and out of the truck to operate it, or if your trailer has a winch to run, then you need two pumps on the truck, one dedicated to the lowboy and the other for the dump trailer.

If you have to have two systems on the truck, shop local salvage yards for the second pto setup for your transmission and have a hydraulic specialist get you a basic gear pump to run what you need to do, save some cash and put it together yourself, you already have the hydraulic tank on the truck.

I'm not sure what kaufman runs for cylinders on the trailers, but some of the newer trailers do require much higher pressures to lift them verses the older lowboy's, most who have gone down this road before know ahead of time what questions to ask before they buy one.

As has been mentioned before here, when the valving is setup correctly on the truck, that lowboy circuit will literally cut down on volume and increase the pump's pressure to max output and will lift most any lowboy, just don't leave it engaged for long periods of time at any one time, your basically dead ending the pump's pressure and capability.

The last thing is does your semi have a one line wet kit or two now? Most dump trailers are single line systems and those pumps put out almost 40gpm's in order to lift the trailer in about a minute or so, two line trailers require less flow and have smaller cylinders and cycle less oil, you also need to know what pump is currently on your truck now, then chat with a hydraulic person to see if your even capable of doing anything with it, there are several dump pumps on the market, mine are all the largest made and have the capability to do as 06 Pete has said, the smaller one's, I'm not sure will work. Its been a few years since I've had to know this information and I've forgotten what the valving is called you need to install to make it work. I did this the last time I switched trucks and trailers and its been too many years ago to remember it all. I had a hydraulic guy help me with the valving and pumps I needed, we ended up switching pumps on trucks before I sold off the old one to save buying another new pump for my current truck. I haven't had time to even think about it, but still have one trailer set up with a pony motor and its valving yet, I haven't gotten around to switching it over to run off the dump pump on the semi yet, as they say its on the "to do list"

 

[RZucker]

One thing I saw once was a Hi volume Lo pressure gear motor running a Lo volume Hi pressure pump as a convertor on an Aspen Lowboy years ago. Im not sure who set it up,. But it Kinda made sense to me at the time. You wouldnt have to mess with the settings on the dump pump that way.

 

[lantraxco]

Yep, find a two section gear type flow divider rated for your maximum flow and pressure, run the pressure line into it, and plumb one side outlet back to tank, the other to your lowboy. Essentially will give you half the flow and double the pressure, you would need a relief valve on the outlet if your system doesn't already have one. Cheers

 

[theironoracle]

Your pump on your truck will operate your trailer just fine if set at 2100 psi. I am sure your dump trailer And lowboy both are plumbed with two braid hoses with a working pressure of 2500 psi, now if your trying to lift a D-8 dozer with a ground bearing 35 ton witzco challenger it ain't gonna work unless you get that thing backed up on the trailer as far as possible lift it then move it forward, hope this helped.....TIO

 

[still learn'n]

I agree with TIO! I have a 55 ton Trail King and haul a Deere 350D and it lifts it with the tracks 4-5 ft from the front with 2100 psi! For a while it didn't lift it after I had the pump changed and I took it back to truck shop and there was a little air line that was unhooked that they plugged off that made all the difference! I don't remember what they said it was for! We use regular end dump pumps to run our lowboy all the time! Jerry

 

[Deeretracks]

We have a TK110 also and I run it at 2200psi. It has never has an issue lifting Our PC400 or ZX450. We swapped from Lowboy to side dump all the time w/o any adjustments.