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806 hydraulics under load....

D

Dan Swanson

Member
Was working summer fallow today with my 806 and a 14' set of sweeps and dead rod. It has always seemed the tractor was under more load than it should be. I set the cylinder so that I was getting the weeds with the rod but still had weight on the wheels of the sweeps. I have an old case cylinder with the control pin that hits an adjustable collar on the ram for dept control. Any way for what ever reason I put the valve into float position,(pushed it clear forward). The tractor immediately smoothed out and ran a lot easier. Wasn't acting like it was under any load as before. So I played with several times and everytime I let the sweeps down and left in the normal position, the tractor seemed loaded more. Put in the float position and the tractor ran a lot better like it should. Might the problem be that the valve is constantly bypassing and needs rebuilt. Or, might it have something to do with the case cylinder? I am going to switch the hoses to the right set of outlets that are controlled by the right lever and see if it is any different. Any ideas?
Thanks Dan
 
The unloading valve is suppose to take the pressure off of the hydraulic system when you are not using it. Pull the spool out of the unloading valve and see if it moves easily in the bore. Check also that the bleed orfice is not pluged and the o-ring is not cut.
Chuck
 
I think that the depth pin on the cylinder is a shutoff valve, not a by-pass valve. It should kick your spool valve into neutral. When the pressure hits the back side of it, it resets. once you hit your depth, kick your lever back into neutral and out of drop.

From what I have read on some 00 series literature, the quick hitch is set up like that, so when the paddle hits the pin it spikes the pressure in the circuit and kicks the spool into neutral.
 
Is the unloading valve part of the valve spool or is is a seperate device, and if so, is it located close to the hyd valves? Thanks for the help Dan
 
This valve on the cylinder seems to work like it should. It kicks the lever/valve into neutral automatically but the tractor is still under load in the neutral position. Push the lever forwards into float and the load is no longer there as long as the lever stays in the float position. Going to switch to the other set of hyd. outlets and see if they do anything different. Thanks, Dan
 
It's on the front side of the rear housing cover,under the seat. There is a plug aproximatly two inches in diameter that may have either a 3/4 inch square on it or a plug that is held in with a snap ring. The unloading valve is behind this plug.
Chuck
 
Switch the case cyl. to an IH cyl. that would have been supplied with the tractor when it came new from the factory and let us know what happens. Armand
 
I switched to the other set of couplers and all works fine, so I'm taking Chuck's lead and check the bypass valve. Thanks for the help. Let you know what I find. Dan
 
If the problem is only on the one outlet and not the other then check to see if the unlatching mechanism is starting to unscrew from the valve spool. That would change the location of neutral position of the spool and keep the system on high pressure.
Chuck
 
(quoted from post at 19:25:00 08/20/09) Switch the case cyl. to an IH cyl. that would have been supplied with the tractor when it came new from the factory and let us know what happens. Armand
Click to expand...

???

Okay, I'll bite. Why on earth would that make a difference?

Besides, getting an original period-correct cylinder nowadays is going to be almost impossible. They were never supplied with the tractor; they were always optional equipment from day 1. Since then most of the original cylinders have been worn out and scrapped, lost, or traded off on a piece of old equipment. Heck, I think most equipment in the 1960's came with its own cylinder anyway.

A hydraulic cylinder is a hydraulic cylinder.
 
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