[swigin]

Hi guys, I need some help with my Onan 316 that has an H2 system from a 318 including the hydro cooler.

I mounted the H2 valve body where the original H1 unit was mounted and used all the lines from the 318 and all was good in the world.

After a year or so I got to thinking about mounting the original H1 body in a new location and shortening my original lever to make my 316 have 3 spools. This is what I came up with.

Mounting every thing was the easy part and the linkage works well with no binding. The part that worries me is how do I plumb this to my pump?

I jumped into this thinking you can just run a T fitting on the high pressure side of the pump and on the return line as well. Apparently it's not that simple and I'm too worried about ruining my pump or anything other parts for that matter to try without asking first.

Both the H2 and H1 valve bodys do not have a power beyond port, which I have since learned is normally how you would do this sort of thing.

I have since found out that Aux-Hyd sells a H3 kit for the 318 that looks to be a H1 valve body mounted kinda like I did. I do not want to bother him with my question since I don't think I need to buy anything from him. And since I have no power steering his setup would be different anyway.

So I guess my question is how should I plumb my H1 unit into my H2 system?

Thank you

 

[swigin]

For the record the H1 unit will just run the deck/rock shaft cylinder and the H2 unit will just work the 4 front ports. They will not be used together at the same time if that makes a difference.

 

[wyogreen]

The hydraulic fluid is always flowing thru the valve except when you operate the valve. So if you "T" the line, the fluid will flow thru the unused valve and not build any pressure in the valve being operated. You could put a hydraulic splitter in the supply line to split the flow between the two valves, but you will end up with reduced flow and slower acting cylinders. The reason you can't just put them in series without using a power beyond port is the high pressure from operating a valve will feed back to the output of the other valve, blowing seals not meant to handle high pressure.

Hope this helps some, Steve

 

[coalminer16]

I answered you question on MTF as I saw it there first. Basically-you need to run one valve after the other in series or it won't work. This is how aux-hyd does it. If you look at control valve banks-they are tied together with the in's on the one after hooked to the out on the previous valve.

 

[barkerwc4362]

I have converted my 332 to H3 basically the same way using a kit from Auxiliary Hydraulics. I have the instructions I can scan if you want to PM or email me. The instructions will show you one way of plumbing the H3 setup.
Bill

 

[swigin]

Thanks for the info guys!

I did the fab work for this about two years ago and have been too scared to go any farther with it. I think it's time to get some lines made up!

William Barker, I sent you an email and appreciate the offer.

 

[jerry_s]

Hey SWIGIN,

Let us know how you finish this project. I added H2 with hard lines, an oil cooler, and dual brakes to my '85 316 all with the help of your detailed posts on the MTF forum. And I've held on to my H1 valve just to do the same at some future time.

The photos you post have been a great help in upgrading my 316. I'm looking forward to seeing how the addition of the H1 valve works out.

 

[swigin]

Thanks for the kind words.

It might be awhile till I get around to adding the H1 back on since I need it for snow removal right now. But if the snow looks like it might be done in a month or so I'll get some lines made up.

 

[swigin]

I just wanted to post some pictures of the H1 mount I came up with.

 

[coalminer16]

One thing people need to remember with hydraulics is you really shouldn't T into them like you would with electrical-you want to put them back to back (series). Good to see progress.