Hydraulic valve help

[Yooper]

I thought I'd start a new thread because I'm probably boring half of you to death with my stump grinder build.

I'm at the point in the build where I have to figure out the hydraulic valves. For the up and down and sideways, I purchased a joystick valve which will take care of the bulk of the work. (Thanks Wolfman for the suggestion!)

I want to go with a solenoid valve to engage the hydraulic motor that drives the cutting wheel. I know it can't be a regular on/off type because the inertia of the wheel spinning will turn the motor into a pump as its winding down. There has to be a path for this oil to go. In my research, I see solenoid valves listed with a 'motor spool'. Sounds like what I need, but I have no experience with them. Can anybody educate me in the right type of valve? This would be actuated by a switch on my dash.

The other challenge is the extend/retract cylinder. I need a solenoid valve that will send pressure to the lock cylinders when in the 'middle', but release the pressure and engage a cylinder forward or backwards when energized with a three position switch. Is there even such a valve? If so, this would allow me to control the grinder with one handle, which would be awesome!

Looking forward to the replies on this!

 

[Dave_eng]

Yopper
Seeing you have not had any responses to your Aug 14 post, I would reluctantly make this suggestion.
Become a member of the other forum as well as this one.
http://www.tractorbynet.com/forums/members/j_j.html
There is a guy identified as J_J who is an absolute wizz when it come to hydraulics.
Try posting in the hydraulic section of this forum and even send J_J a personal message.
He was a big help for me.
Dave

 

[Alphonse]

Yooper
I hope you have everything sorted out by now.
Sorry I can't tell you HOW to do this, but YES the gear exists.
I will verify the vendor and see if they sell retail.(I've been retired fifteen years and not in that loop).

Also I think you could configure the cutting wheel drive to more or less brake instantly if desired.

 

[Kennyd4110]

Sorry I've just seen this...

Yes, you want whats referred to as a "motor" spool valve or sometimes called "open center" where the work ports are open to the tank in neutral-this is opposed to a "tandem center" valve that has the work closed in neutral to hold a cylinder from moving.

I'll assume 12 volts, so one like this would work perfectly (with the proper subplate of course)

http://www.surpluscenter.com/Hydrau...-GPM-OC-MOTOR-SPOOL-SOLENOID-VALVE-9-6137.axd

Or:

http://www.northerntool.com/shop/tools/product_200329577_200329577

 

[Yooper]

If you go to my 'Stump grinder build' thread, on the last page I have a picture of the valves and their purpose where I pose a few questions.