china kat

[bigford]

nope she is a real nice load on the lowboy

[Radar]

That is a great pic of that Kat on the low boy and that truck and trailer combo are killer thx for sharing

[daddycool75]

Hi Bigford,

What valve body did you order?

Cheers
Jamie

[bigford]

going to order the morpower off ebay same one rcfarmer is using
I just charged up the batteries and going to mess around with the lowboy and kat

[bigford]

how is the pressure regulator suppose to work if fluid bypasses it?? I assume there is a tee fitting
going into the reg from the blue line

[doodlebug]

The relief valve only opens when the preset pressure setting is exceeded, or the valves are in neutral (holding position for the cylinders). The picture is correct.
Cheers, Neil.

[Cooper]

Think of it as a pressure release (like a pop off valve) the pump sends pressured oil to valve block AND to the pressure release valve (regulator) when the cylinders are maxed out or no valve is open, or digging pressure is maxed out (like hitting a big rock) then all that pressured oil is diverted to the p.r.v. That is what you can call the regulator, can adjust pressure limit to where you want. I would suggest to get a gauge and see if you are getting enough pressure. Worse case is you would pop a hose off or burst one if pressure is too much. (I would think the hoses would go before the valve seals ?) and think how the cylinders work, only one end has pressure at a time, the other end is just being pushed out and returned to tank. Do you have a gauge? It might be as simple as you just don't have the prv set to enough to pressure and that's why it seems like no power.

[Cooper]

Oh and what does that say after kat in the above picture? I just can't make it out ? lol!! I forgot to mention you can get a gauge from McMaster, forget what the threads are but I drilled mine out and threaded m5 threads for hose fittings. The gauges are just brass fittings with a krimped copper pipe that expands/contracts under pressure. And there is plenty of brass to work with before any risk of getting to the actual expansion plate.

[rc_farmer]

Originally Posted by bigford

how is the pressure regulator suppose to work if fluid bypasses it?? I assume there is a tee fitting
going into the reg from the blue line

I can you a pic of my setup if you like. With the help of a couple fellow excavator drivers, i was able to figure my plumbing out.

[bigford]

sounds good to me!!! i need to get mine smoother then coopers cat

[Cooper]

Well if that's how it is, make sure you connect all hoses from pump directly to cylinders and then use a toggle switch to activate the pump!! Should get the Rams screaming!! Lol!!!!

All kiddin aside, don't worry about getting them smooth, first get your pump and pressure settings how you want. Then use the limiting of your servo throws to (end points) adjust how far they open. That will allow the cylinder to be fed by less volume but same pressure. I forget where I have mine set but everyone will be different. Like boom down was almost 30% if I remember correct. Weight of bucket, stick, boom, and gravity help on the down. Any drifting should be one of two things, valve is not centered or compromised piston seal in cylinder. That was the problem I had with my stick cylinder, the piston came loose on the shaft and oil was bypassing the piston/seal allowing for drifting. But get the valves centered, pressure set, pump speed, prv ect before you try and smooth out movements. And most likely you don't have to have the pump screaming to make pretty good pressure. Really need a pressure gauge. Doesn't have to stay in model but for setting the pressure from time to time.

[bigford]

I know ralph but if I cant pick on the Canadians then you will have to do!!!

[speedy8305]

Hey from the photo the Kat looks like it was a good load on the trailer so much that the trailers rear tires came off the ground

[bigford]

there are 3 screws per side going from the bed to
the rear deck that loosened up making the
rear axles lift under load...

[speedy8305]

hey it looks good none the less

[bigford]

well after messing with the cylinders I found them leaking under load
where the end cap screws into the body. I tried to seal them with pipe tape
and tightening them up but they still leak. new cylinder time
the valve body im still not sure about

[rc_farmer]

Do you have the new cylinders? I have the new ones and have found them to leak as well. I going to HDepot and get some sealant and and maybe some new O-rings. If you tighten the caps, you will also find that the inlets are not centered either....

[daddycool75]

I have the new cylinders, They leaked until I used Loctite 542, it seemed to hold.

I tried pipe tape at first, but no luck!!

But remember and have the screw holes lined up before the Loctite sets.

[bigford]

tightening up the bottom cap puts the bottom inlet at 11:00
i'll try the loctite

[bigford]

whats the difference between old and new and how do you tell them apart??
mine look like two rubber cups ontop of another. like the wedico piston
no O-rings