FEL control valve on YM1900

[Gary Sweat]

I hope this topic has not been covered and I'm wasting every body's time but I'm stuck trying to understand how to plumb in the loader control valve I have on my YM1900 loader that I built. The guys in the hydraulic section have been very helpful in getting me to understand how the valve needs to be plumbed but I have a problem with the tank port and the PB port on the valve. I understand how the PB port works and the need for it to keep the 3pt working. The problems is that I don't have a "return" line anywhere on my tractor that I can find to route the "tank" port on the valve to and it appears I have to have this port hooked up.

It would help a great deal if anyone has a photo of their loader valve hose routing on a similar tractor series so I can see how it is done. I really want to get this loader operational but for now I'm stuck on this problem

Thanks in advance.

 

[normde2001]

Koyker loader install on a Yanmar

 

[Gary Sweat]

Koyker loader install on a Yanmar

Thanks for the link. I wonder if Koyker uses a control valve that can withstand the pressure from the pump on the tank port? This seems like the 3pt would raise the outlet pressure on the port to that of whatever the 3pt is putting on the system. I don't know what the max pressure my valve can take on the outlet port but most everything I read says they don't take much. I'll try to see if I can find a spec sheet on this Bailey valve and see what it says it can take. I don't really know how much it takes for the 3pt to lift a 4' bush hog but I would think it is would be quite a bit.

 

[California]

In that era the American Yanmars came with a diversion block, in series, just before the high pressure line goes into the 3-point cylinder. Fluid is routed out the diversion block to the loader then the loader control's return line comes back as the feed for the 3-point.

 

[Gary Sweat]

In that era the American Yanmars came with a diversion block, in series, just before the high pressure line goes into the 3-point cylinder. Fluid is routed out the diversion block to the loader then the loader control's return line comes back as the feed for the 3-point.

I know zero about hydraulics except for what I have learned in the past few days so I don't fully understand what you are saying. Here are some pics of my hydraulic system on the tractor that I am trying to hook up the valve to. My valve has both a PB and tank port. From what I have learned, I need the PB port to keep the 3pt working and a line from the tank port on the valve to return the cylinder oil to the tank (which on this tractor is the transmission). I just don't know where I can return the tank port to since I don't find any return lines on the tractor. I was wondering if anyone could let me know how I can get the cylinder return oil back to the transmission without it being pressurized by the PB port?

 

[deepNdirt]

I had the same concern back when I decided to install a FEL onto my tractor,
here is the link to my thread, please excuse the confusion, I didn't catch on right away, when this was explained to me either, you might find a couple of Photo's where the dump line comes out of the joystick remote control,
http://www.tractorbynet.com/forums/hydraulics/153131-front-end-loader-hydraulic-control.html

 

[Gary Sweat]

I had the same concern back when I decided to install a FEL onto my tractor,
here is the link to my thread, please excuse the confusion, I didn't catch on right away, when this was explained to me either, you might find a couple of Photo's where the dump line comes out of the joystick remote control,
http://www.tractorbynet.com/forums/hydraulics/153131-front-end-loader-hydraulic-control.html

Thanks Deep, once again you have saved me (back when we were discussing the front axles). I guess I am going to have to rig up a line like you did into the tranny fill cap to make this work. I 'm thinking of maybe making an extended tube from the tranny fill tube and routing the tank line into the side of it so I can keep a fill cap on top. Will have to make a modified dipstick due to the added height of the tube. I'll send you a photo after I make it. Thanks again, this will solve my problem as to where the tank line has to go.

 

[Gary Sweat]

The FEL's built, hydraulics installed. Now comes the question on how to bleed the air out since everything is new and I haven't started it up yet. If anyone has installed a completely new system or has bled systems before, please let me know the right way to do this so I don't mess it up right from the start. Thanks.

By the way, IMO, building the loader was a whole lot easier than figuring out all of the fittings and hoses! :confused2:

And thanks again to all those that helped me figure out the valve and hose routing.

 

[winston1]

Been waiting on someone to respond to this. I haven't installed a new system but I do have an opinion. If suction line to pump has not been tampered with the pump should be primed. If the suction line has been opened I would fill the spin on filter with fluid before installing. If pump is primed I believe all the rest will be self bleeding. Low rpms while moving loader controls all directions should take care of air in system. Being careful to monitor fluid level as it will go down some as you fill loader system. Procede at your own risk.

 

[Gary Sweat]

My concern is mainly with the cylinders since the bucket cylinders point down and the arm cylinders are at a slight angle up. I wasn't sure how the air at the low ends will get out or if it can get trapped in the lines and move back and forth. I've read about damage to cylinders if air is trapped in them under a load. I think the valve will self purge to the tank return on its own. I didn't know if the cylinders should be disconnected at the load end and cycled with the fitting a little loose like you do for a brake line or if it even matters. The return line has not been broken from the pump, just the pressure line for the valve to tie into. Any air that got in when the pump line was cut should (I think) pass through the valve to the return if I let it run a little bit before actuating the valve.