Just as the title states. I'm trying to increase hydraulic pressure at a remote valve on an Osh Kosh Concrete Mixer. The chute controls are ULTRA SLOW and I think with slight boost in pressure at the remote valve it'll solve my problem. Is anyone familiar with these types of valves? Its basically a glorified log splitter valve but its got 3 remotes in one unit. So its got 3 levers. One controls up and down, one controls left and right, and the last one folds and unfolds the chute. This is mounted under the bumper up front then 3 cables run into the cab to the joystick. I can see what looks like it would be the adjustment area, its got a 1/8" NPT looking pipe plug in the end of it which takes an allen wrench.

I know this is pretty off topic but theres got to be some people that have messed with remote valves before.

Thanks.

 

Well, I'm no expert, but I don't think increasing the pressure will do a whole lot unless the relief valve is bypassing all the time when the valve is activated. Sounds like you need more flow instead of pressure. Of course, what we're calling a relief valve may very well be a flow control instead. I've worked on a lotta stuff with similar problems as you're having only to find that someone had put flow restrictors in the fittings where the hoses connect to the valve because something worked too fast and was too hard to control.

Hope this helps.

chaikwa.

 

I see what you're saying. The only reason i'm thinking its one particular adjustment is because the mixer I had prior to this one had a problem with the chutes unfolding and folding ULTRA SLOW. So they did one particular thing and it sped all the functions up. Then up and down, left and right and chute flip were working at a reasonable pace rather than super slow like they were. Maybe theres a flow restrictor in the main line going into the remote, therefore its slowing all three functions down. That mechanic has since left so now everyone is scratching there head and i'm pulling my hair out.

 

If you increase the pump speed will any of the actions increase in speed or was it designed to be slow?

 

If I recall correctly your pressure will increase the capacity, more pressure on the cylinder piston equals more force, strength. The flow as mentioned above would increase the speed. How old is the truck, could have some pump issues. Are you running the engine at high idle? If not try that and does it speed up your functions? I know some pumps could be adjusted at the pump, we did several(many) at the Cat house on the bench and you had to make sure the pump would flow XX gpm at xxxx rpm, if not you could shim or adjust with a screw and jam nut. On a simple note I don't know if a dirty or clogged filter could affect it in anyway, but using the kiss method and thinking it could restrict flow if it is on the suction side before the pump. On the return side I don't think it would, but that's just me thinking out loud.....

 

If I rev the engine slightly all the actions speed up slightly, and I mean slightly. The problem with working them at a higher idle is this is a front discharge cement mixer so its almost always in a gear (Allison Auto) so you can't rev the engine or it'll drive through the brakes while in low range. Even at an idle you have to STAND on the brake pedal to hold the truck back. If you move the chutes either direction you can hear the hydraulics hissing like theres a restrictor on the line. I just think engineers and safety freaks got there hands on the prints and told Osh Kosh to slow the chutes down. You wouldn't even put a bruise on a fly if you swung the chutes into it thats how slow they are now.