Snow Plow angle ability?

[Anonymous Poster]

I am working on modifying my Fisher snow plow to fit my 1994 Kubota B-2150 it has worked so far but I do have one major road block. I thought I would be able to use the tractor's hydraulic bucket "dump" and "roll back" circuits to power angle my plow.

I have it rigged so that my right angle is "dump" and the left angle is "roll back"... Here is where the problem lies... it will only angle left. When you try to angle right the hyd. whines and the tractor will almost stall.

My angle pistons are one way but my bucket rams are two way. My guess is that for some reason the fluid cannot bleed back out of the cyl. but why will it work one way? Even with the 2way rams the excess fluid has to go SOMEWHERE! Doesn't it bleed back through the valve bank?

My real concern is, is it possible to make this work cheaply? I've spent $75 on hyd. hoses & fittings so far I don't want to go broke doing this!

Thanks!
~John Sylvester

 

[beenthere]

That hydraulic setup, as you have it, works for my Deere 4300, but if I push the control lever hard to the far right to "dump", it goes into a "fast" dump circuit mode (called regenerative, I believe) and the blade will not angle to the right. So I don't push that control all the way to the right, but just part way (which works fine). I am not sure your 'Bota hydraulics is the same, but might be worth a try.

 

[Anonymous Poster]

This circuit should work, presuming you have a line that would be connected to one eod of the dump cylinder to each of the one way cylinders.
BIG CAUTION HERE- Make certain you have a snow plow type releif valve in the circuit between the valve and the cylinders. A noow plow blade developes tremendous forces against those cylinders, and without a releif system the pressure will be sufficient to bust hoses, lines, and cylinders.

 

[Anonymous Poster]

I found a double relief valve on Prince Hydraulics closeout website for around $32 + shipping. 2000 psi lift. Here is the link:
http://www.princedirect.com/pages/closeout_list.cfm?category_id=14

 

[Ekim_Otsiam]

The setup wont work that way because of the way the regenerative circuit works.Copy and paste this link because I cant seem to link it here.<font color=blue> http://www.tractorbynet.com/cgi-bin...ykubota&Number=101191&page=&view=&sb=&o=&vc=1 </font color=blue> Read the 1st post by Kubmech and scroll down to his explaination of the 3- pos. valve. I think thats your problem.

 

[Anonymous Poster]

A $400 mistake?

Well it looks to me that without a new 4 way control valve I'm going to have to like plowing in one direction...
Unless there is a wayto override the regen function, maybe I'll contact Kubmech...

Well I'm glad I know this now!! Thanks for the word Ekim_Otsiam!!

Looks like I may rig up that old headgear and control valve & cables sooner than I thought!

Thanks,
John Sylvester

 

[Trev]

A number of people have mentioned this having something to do with the "regenerative" function. On my 4300 I have a lever down near the diff lock, if I recall, which has three positions, one of which turns off this regenerative function.. and they recommend it be used for anything besides a FEL.

Doubt if this helps, but who knows..

Bob

 

[Egon]

Trev:

" "the "regenerative" function." "

Will this also work on a tired old body like mine???

Egon

 

[Trev]

Sorry Egon, I think our warranties are up! /w3tcompact/icons/laugh.gif

 

[Anonymous Poster]

Re: A $400 mistake?

Something isn't making sense with regard to this regenerative situation. All that should be happening in regen is that the oil leaving one end of the piston is being sent to the other end of the piston, rather than being dumped into the reservoir, so you should be able to connect the "bucket tilt" hoses to the single acting cylinders, thru a overpressure valve, and the blade should function properly.
I'm not conversant with the tractor model in question, but unless the regen system you guys are referring to involves a bucket leveling cylinder, the system will support hydroturn easily.

 

[Anonymous Poster]

Re: A $400 mistake?

Well I think I can remove the FEL and use the aux. hydraulic block to get hyd. power to the valve bank on the snow plow's head gear. Judging by the attached picture I should be able to connect the pressure port to my inlet and my outlet to the tank port. The power steering and 3 pt hitch should still work A-OK. I will post some pictures as soon as I fab the plow headgear to the front of my already fab'd plow frame.
-John Sylvester

 

[Anonymous Poster]

Re: A $400 mistake?

The more I read this the confuseder I get. I looked at Trev's rig today, and he has hydroturn operating on his plow.
I'm thinking you have a hose misconnected someplace because his uses the dump/curl hoses to swing the blade left/right.
The hydraulic function of the D/C circuit is exactly like the function of left/right with single acting cylinders on the plow A frame. You should have the dump hose connected to Left, and the curl hose connected to Right.
If I'm reading correctly, you have that, and are jamming in one direction.
Do you have an overload releif valve between the loader connections and the blade? If so, that could be connected wrong, and causing the problem.
Are you sure the single acting pistons worked properly before you hooked up?
Also, you could have a non operating quick connect in the line running to the cylinder (direction it won't extend) and that would also cause the problem you are describing.
Since I'm not hands on, I need more information.
You DEFINITELY don't need to come back to the power steering diverter valve to make this operate. If you add a valve at that point, it must be in series with the circuit, or nothing will operate.

 

[Anonymous Poster]

Re: A $400 mistake?

I even switched the hoses at the plow to see if one cyl was bad and when I tried it, it just angled the opposite way and jammed in the other.

The post by Kubmech about the regen. feature of dump is the best explination I've heard about what is happening. Pressure to both cylinders while pushing the joystick to dump (or angle right when the plow is on) would cause the cylinders to lock.

I have no overload relief valve that I have installed I'm sure there is one built into the tractor valve bank and built into the plow's valve bank. So that is out.

"You DEFINITELY don't need to come back to the power steering diverter valve to make this operate"... Well I'm not really going back to it, I'm going to the quick-connects that the FEL was hooked to; they in turn run back to the previously attached diagram's hydraulic block (the power steering diverter valve).

I think I'm all set now, I feel confident about the info I've gotten and I'm ready to go back to work reattaching the plow's head gear(the lift piston assembly). As I said before I will post some pics when its done! hopefully by the end of the week!

Thanks for all the help!!
~John