Power Steering & FEL on Yanmar F16 project

jimmer2880 · Dec 8, 2007

DRL said:
That is true. Did you ever check you PR valve like we talked about?

Did you get the 5cc figure out of your tractor manual? If that is per revolution of the pump you need to know the ratio of the drive to the engine.

DRL

I have not check the PR valve. I'm waiting to do any further testing until the PB sleeve comes in. I figure I should limit the amt of use until the tractor is plumbed up the proper way.

I got the 5cc figure off of the pump itself. The owners manual doesn't even get close to any specific hydraulic info. The shop manual is in Japanese, so that doesn't do me any good.

But, thinking about the 5cc/rev. The gear on the pump is rather small from looking at the casing. So, if it were 5cc/pump rev, then I would assume that the pump would spin at least 10 times per tractor rev. Then, I would end up with a 20gpm pump. There is no way that's a 20gpm pump. Which is why I chose tractor rev.

But, that is just 1 big guess and I could very easily be wrong.

One reason why I think I may be wrong, is how would the pump manufacturer know what the tractor gear size is? If I were a pump mfg, I would put cc/pump rev, not tractor rev, thus not tie'ing that pump to that specific tractor.

How nice it would be to not have to guess so many times

DRL · Dec 8, 2007

The way the pump is mounted, how hard would it be to see the drive gear. Count the teeth and the teeth that it meshes with and figure the ratio to engine that way. BTW if you do that do lots of measuring and take lots of pixs of the drive end and shaft of the pump in case you decide to go to a larger pump you will already have what you need to look for a replacement.

Also you could try asking on this web site in the forum for you brand of tractor. Someone would know what the ratio is I would think.

DRL

jimmer2880 · Dec 8, 2007

I had thought about taking it off & counting & measuring. I've never had one off before. I suspect it's not hard. But,knowing my luck, I'll end up messing up a seal, or something. I may/will probably end up doing that though.

As far asking on the Yanmar forum, I started a thread yesterday. But, my model isn't a real popular one. I haven't had much luck yet.

thank you again, and again and again for all of your help. I'm not ignoring it. I just think I should take it 1 step at a time, with the PB sleeve being first. Then, on to the rest of the troubleshooting.

I'll actually get some sort of measured results also (probably, just speed of raise, etc since I don't have a pressure guage). That's another reason why I want to wait on the sleeve.

jimmer2880 · Dec 16, 2007

I finally got the PB sleeve and installed it. No surprise, the rate didn't change much. However, because I had the stop watch & paper handy, I did play around with engine RPM ranges.

At 1500 RPMs, It takes approx 30 seconds to curl the bucket. ~15 to raise the FEL. The 3pt is about 15 seconds as well.

But, if I drop down to 1250 RPMs, all numbers easily double, or more. At 1000 RPMs, the FEL won't even raise.

Yes, it sounds like I have a serious flow problem.

Rick, the power steering guy, is swapping out the 2 gpm priority valve for a 1.5 gpm priority valve. The steering orbital pump is supposed to require 1.6 gpm. We are hoping that the 1.5 won't starve it into submission. That should make a huge difference. Rick volunteered to swap out the valve for only the shipping costs. Again, I am beyond 100% satisfied with the service I have rec'd from him. Especially now that I'm in "post sale" mode.

Unfortunately, I don't have a hose to do some of the "cut around" tests I was hoping to do.

I have a quote for a 20% bigger hydraulic pump. However, it's $400.00 +shipping. I hope I don't need to go that far, but I may not have much of a choice.

jimmer2880 · Dec 21, 2007

I swapped out the 2gpm priority valve for a 1.5gpm priority valve today (thanks to Rick). What a difference that .5 gpm made. I need to do the timings to see what the difference is. But, what I can say, is that I now have FEL & 3pt function at 1250 rpms (and, probably lower). The speed at 1500 rpm seem to have almost doubled. I'll try to take another set of timings to put some hard numbers on paper.

The steering MAY be a smidgen slower than before. But, it's really only noticable when I'm trying to spin the wheel as quick as possible. I checked it out doing mowing style maneuvers, at mowing speed and didn't have any problems.