1500D Hydraulics

[gerlacr]

I am in the final stages of finishing a CADLoader for my YM1500D and have a question regarding the hydraulics. I have purchased the new control valve for the loader and will be inserting this in-line on the high pressure line between the pump and the three point cylinder. It has a "Power Beyond" port which feeds the three point cylinder. It also has a return port that needs to dump fluid from the loader cylinders back to the reservoir, which in this case is the rear gear box. Is there a port or a tapped hole on the three point cylinder/control valve assembly that can be used to dump fluid back into the gear box?

 

[blackd]

There probably is a connection point but DO NOT do it. I connected my FEL off the 3 Pt feeds and returned back through them and there isn't enough flow volume. I have draft control and the valves restrict flow, consequently, my FEL is slow. I am waiting for better weather to replumb.

Take the return back to the point you first picked up hydraulic pressure. If you picked up pressure from out of the pump (cut the high pressure line) then go right back in to the system there. There is little chance of effecting the rest of the hydraulic system. If you are picking up pressure at another point go back there, but make sure there aren't any volume issues.

Don

 

[lens12]

Return port can go to hydraulice fill hole . This will have no afffect on loader speed.

 

[EFC]

blackD, reread Gerlacr's post again, he is doing it exactly the right way. He cut into the high pressure line and is returning to the 3 point from the power beyond. This spring when you do yours it will be a big improvement. and your loader capacity won’t be limited by the 3 point valve bypass.

Len is right, return the oil fill hole, you can get a fitting that will screw in and has a right angle JIC built in.

 

[gerlacr]

Buck

Where do I find one of these filler tube extensions with a right angle fitting? I assume you are referring to the oil fill hole with the plastic cap that is about an inch to an inch and a quarter in diameter that is mounted next to the gear shifter and dip stick. Can I use some common low-pressure hose for the return line since there is virtually no back pressure. I can use a slightly larger ID size to insure no restrictions.

Ron

 

[EFC]

I will measure it and see what the dimensions are for the filler adapter, it is metric. You can buy them through hydraulics shops or the like, or any one of us dealers that sell hydraulic parts. It is low pressure but I still use high pressure hose. The oil can get pretty hot and if it were to get pulled off then you would get one hot shower. You can use a larger hose if you want and it will speed up your multiple spool retracting operations.

 

[Anonymous Poster]

I have an F16D that is plumbed with the power beyond as described above, but the loader is still pretty slow. Is there an adjustment that can be made to dump more fluid through the return line, rather than sending it all back to the 3 pt and then to sump? I noticed that if I disconnected the PBY hose, the loader moves very quickly.

Also, I would be interested in the measurement for the 1500D hole and/or the part. I know someone that needs one of those so he can set up PBY on his tractor.

Thanks,
Matt

 

[gerlacr]

The rear gear box on my 1500D has cover plates on each side that are about 2" in diameter and are secured with three screws. They are located above the normal fluid level and must be for some uninstalled feature. One of these would be a nice candidate to install a hydraulic fitting for the return fluid. R & R would be simple. Any thoughts?

 

[bruce1966us]

Assuming you are using an open center valve, you need to tap into only the pressure line. DO NOT put a tee in the line . Cut a small section out of the pressure line and connect the hoses as followes.

The line from the pump should go into the hole on the valve marked pressure or inlet. The other hose from the valve goes back into the pressure line going to the back of the tractor.

If you have any questions call me at (931) 455-6999

Thanks,
Bruce

 

[Inspector507]

Bruce,
The outlet goes back to the hydraulic line that was cut?
What about a return line to the tank?

 

[Tractors4u]

Bruce is right. It is the simplest way to hook it up. Think of it in terms of electricity. You are put the controller in "series". When you connect the line out back the supply line that runs to the rear of the tractor you are completing the circuit. The fluid is still under pressure and it is going to the 3 point to do more work and then it is dumped back into the tank.

 

[Inspector507]

I guess I was wondering where the "used" or return fluid goes. I assume from your post it returns to the hydraulic system and is still under pressure through the outlet port.

 

[EFC]

Open center systems always have to maintain flow from the pump to the sump if it is ever blocked the pump goes BOOM! You can just plumb form one valve to the next going in and out in and out till it dumps in the sump. Until you activate a spool there is no real pressure. The three point is just a valve like your loader valve and works no differently. It has an input and output. you plumb from the loader valve out to the 3pt valve in. That works great unless your three point valve has a sticky spool or there is a block in the line like a quick disconnect coming unplugged. Then there is no place for the pressure to go so the pump goes BOOM (or heats up and smokes like a stuck spool would cause! The way around that is to use a PB valve. you plumb from the PB valve on the loader to the input of the 3pt valve. the output of the loader goes directly to the sump. Inside the loader valve is a high pressure bypass circuit. If the 3pt spool or a quick disconnect came unplugged the loader valve would just port that pressure to the sump so the pump is saved. Either way works on these low flow pumps but if you run quick disconnects or remote disconnects then I would most definitely use the PB valve. I have about 40 pumps in a box that are ruined from quick disconnects coming unplugged.

 

[Inspector507]

Thanks Buck,
I think I'm finally understanding most of this.
/forums/images/graemlins/grin.gif

 

[gerlacr]

Buck

I do not recall seeing an answer to my question about an extender for the filler tube on my YM1500D. I am finally done with the loader and all of the hydraulic lines except for the low pressure return to the sump. The plastic filler cap threads are approximately 1.25" in diameter. You stated that I should be able to find an extension with a right angle JIC fitting built in. Any suggestions of where to find one.

Ron

 

[lens12]

The fill hole is NPT. Use a nipple , plu, & tee