YM2000D controls under seat.

[yavapai]

Just got a Yanmar 2000d and I wanted to better understand what the large "knob"? under the seat is. also the little lever next to it. I know there for the hydraulis' but I wanted an official description of what they are..

thanks for the help.

 

[HoyeTractor]

The big knob in the center is used to lock the three point in the up position. Raise the three point, close the valve, & it will (should) stay up. Leave it open when using the three point.

The other valve is the drop rate valve. Close it to help heavier implements lower slowly- open to get lighter implements to lower faster.

Aaron
Parts@HoyeTractor.com
(940)592-0181

 

[yavapai]

GREAT!

then I have another question

can the position of these valves effect the hydraulic pressures enough to cause me to blow hydraulic pump shaft seals? I have another post in the "Hydraulics" section of the forum, but your post has caused me to wonder.

Thanks,
Yavapai

 

[HoyeTractor]

can the position of these valves effect the hydraulic pressures enough to cause me to blow hydraulic pump shaft seals?

No. I don't think it would if everything else is working right. My guess would be that your loader is hooked up wrong or the relief valve is set too high.


Aaron
Parts@HoyeTractor.com
(940)592-0181

 

[yavapai]

relief valve.... cant find it.. dont mean to be asking somewhat dumb questions, but is there a possibility that my system does not have one? where would I look? the sky is the limit when it comes to ideas. Im not sure what could have been done to this tractor befire I got it (with a broken pump)

thanks
yavapai

 

[HoyeTractor]

I couldn't find a really good picture but it will look like the thing sticking out in the bottom left of this pump --

http://i18.ebayimg.com/05/i/000/c2/08/cabb_1.JPG

I have had several customers who thought their loader should lift more than it did & they cranked the relief valve up until it broke the pump. Reading your other post though it sounds like the loader never even moves which goes more back to the being hooked up wrong.

What exactly do you do just before the pump fails?

I just aquired a 2000d from my uncle who just upgraded to a new tractor after the hydraulic pump broke. Upon investigating I was advised that he was using the gannon when he lost all hydraulics at the snap of a finger.

What I found was the pin on the pump shaft had sheared, (of course) he lost all hydraulics. I replaced the pump (just because) upon startup I had partial use of the 3pt but no movement with the loader. the shaftseal broke and most of my hydraulic fluid ended up in the oil pan before I got it shut down. I replaced the seal in the pump, and the same exact issue, but the 3pt was at fulll strength before it blew the seal again, loader was still dead, absoloutley no movement.

Tractor is in good shape with 600 hours on it, and I think that this is a simple issue, but I am hydraulic dumb.

Now I have 2 working pumps both need seals, I have all the extra parts to make a fresh install AGAIN, but I know I will waste 5 gallons of hydraulic fluid again. Is it time for a professional? or is there an easy fix. I am a knowledgeable do it your selfer, but I am hydraulic dumb when it gets into too much detail. Also, the hydraulic filter is brand new

Aaron
Parts@HoyeTractor.com
(940)592-0181

 

[Dick_Jermyn]

Food for thought; The hyd. system is a 'normally open' system. If the system gets blocked and cannot return flow to the sump, something will blow up or break. Many of the FEL have a pressure relief valve up near the joy stick area. I am in agreement with others that it sounds like the FEL is not plumbed correctly. Hyd. fluid should go through the joy stick spool valve (in a normal/neutral position) and then return the rear sump via the master valve block (under the seat). Trace your plumbing and let us know what you find.

Dick

 

[yavapai]

I have traced the system. best example that I can provide is one of those "blind leading the blind" I am leaning to the QDs.

There are too many lines for me to completely understand. but as near as I can tell it looks like I have a complete circuit that ends up back into the tank. the only reasonable possibility of a problem are the qds.

What I mean is, the fittings on the entire system have that small film of oil, dust whatever on them and show no signs of having a wrench on them.

The QDs were detached once by my uncles neighbor who admitted that he really does not know tractors or hydraulics.

I am going to start there, but I just wish I had a better understanding of the plumbing before I just started blindly reversing lines on this thing.

You all are a great help. I havent had time to look into the relief valve yet, Thanks for the picture. Ill let you know.

 

[yavapai]

First, to one of the replies, the increase in RPMS blows the pump. To me that tells me that having partial flow to the 3pt causes partial relief of pressure, but when the rpms are increased the system cant handle the aditional load. that also makes me think that the blockage is in the loader valve. Let me know what you think of the post below.

I looked over the plumbing, and it looks fine to me. the lines travel from the pump to the inlet on the loader valve body, and right next to that there is an outlet for the 3pt. at the outlet side the valve body travels out to the return hose.

I was thinking and have started looking into another area. With the 3pt working, and the loader dead that has me leaning towards the valve, or some aspect of that valve. I know it has kind of been ruled out from previous posts, but what about the reliefe valve.

When this broke, my uncle stated that he worked on it for some time and could not get it to work.. lets say that he started wrenching on the relief valve for the loader. could it be turned all the way one way, or even slightly too far? would that cause it to blow the seal?

anyway, if I cant get anywhere in the morning Im taking it to a local hydraulic mechanic.