Laser grading hydraulic valve issue.

[mrmikey]

double post...deleted....Mike

 

[mrmikey]

That's the first one I came across.
Here's a link to some good but very deep info re the valve/solenoid http://tinyurl.com/ownk33b , definetly not nightime reading but very informative .
I'm wondering if the solenoid is indeed 24V instead of 12V if it's overheating baking the O rings causing the leak.
(never mind that thought, I see it's 11-32V)

I was told that the reason it failed was because I had hooked up my hoses backwards and applied pressure in the wrong direction

You did notice the 'T' and 'P' on the inlet section?....Mike

 

[Complete Turf Care]

Bump.

J_J, any suggestions on how to protect the 'coil'?

 

[glastron23]

Complete... as far as the coil voltage it's not the problem, your coil is 11-32 volts. If you reversed the pressure/return you more than likely jammed the pressure reduction valve that feeds the pilot valves ( these are on the coil side, the part you replaced) look on page 6 of this link. it's part #2 http://powersolutions.danfoss.com/s...uments/product_literature/11051935.pdf#page=1

 

[J_J]

Voltage or hyd pressure.

There should be o-rings around the solenoid shaft going into the valve. They should be sufficient if there is no hyd spike.

The proportional valve works in relation to the signal it receives, could be large or small increments.

Is there a sensitivity adjustment on the valve or in the laser system.

 

[npalen]

Both are open center Tractordata.com shows the Kubota at 14.7 gpm and the New Holland at 9.8 gpm.



Yes, that does seem to be what I have. But that company is in the UK. My tractor is 12 V as far as I know. It has one 12V battery

Why is it that those doggone Europeans always have to do things wrong. Examples: 220 volts rather than 120 volts for household use---driving on the wrong side of the road etc.
I'm surprised that they don't run their clocks backwards also.

Edit: Just kidding. (ducking and running):laughing::laughing:

 

[oldnslo]

Complete,
Can you check the tank line pressure on the Kubota. Most pilot valves on this type of unit require minimal back pressure on the tank line to function correctly. I would suspect it would be around 25 bar (350 PSI) or less. Excessive tank line pressure will damage the pilot controls. Some valves have the option of an auxiliary drain port just for the pilot section. Not sure if this is an option on your valve though.

 

[ishiboo]

Is the return line on the valve hooked to the "case drain" on the tractor? If it's coming off the loader valve, it probably isn't since there is only one case drain from the loader valve that goes back to the tractor.

Hooked to two sides of the same spool, you could be bleeding a bit of pressure off in neutral via the return OR accidentally activating the loader valve when off in the opposite direction.

The drain side should have NO pressure on it. Disconnect that line off the valve entirely and run it into the oil reservoir on the tractor until you have this figured out, so you don't kill another $$$ valve

 

[aczlan]

The drain side should have NO pressure on it. Disconnect that line off the valve entirely and run it into the oil reservoir on the tractor until you have this figured out, so you don't kill another $$$ valve

This. There are various plugs that will go in your oil fill port (assuming that there is one behind the seat) and let you add a quick connect to drain oil. See how a 3point post pounder is plumbed for some examples.

Aaron Z

 

[ishiboo]

Probably the right way to do this is to change the valve over to an open center, which will have a an "out" and a tank drain. It would then be connected in series with the loader valve.

This is how I operate my post pounder with the open center Kubota.