Hydraulic question on a Kubota M 6800

   / Hydraulic question on a Kubota M 6800 #1  

HCJtractor

Veteran Member
Joined
Jan 28, 2009
Messages
1,544
Location
upstate South Carolina, Greenville
Tractor
Kubota M6800, Massey Ferguson 240
I hooked up my new grain drill to the 3 point hitch and lifted it. Weighing in at 3000 lbs, it was a load. I also tilted it forward with the hydraulic top link to gain more ground clearance. I then tried my FEL and it would barely move, very slow response. When I sat the drill down, the FEL seemed to be normal. I suppose the hydraulic system was overloaded. Is this a normal response? I was lifting it to load onto my trailer, and as I go up the ramps, it would be nice to be able to alter the FEL just to get clearance and balance. Just wondered if this is to be expected or if something is not as it should be. Never had that happen before. If I have a bush hog or disc on the rear, the FEL always works fine. Of course, the drill is somewhat heavier.
 
   / Hydraulic question on a Kubota M 6800 #2  
The 3pt should be in neutral when using the FEL, or it will cause problems with back pressure.
 
   / Hydraulic question on a Kubota M 6800
  • Thread Starter
#3  
Thanks JJ. By neutral, I assume you mean with no load at all, with the drill resting on the ground? Frequently, I drive around with my disk, box blade, or cutter raised with the 3 point, and the FEL works just fine. Is the difference simply the excessive weight of the drill that is causing the FEL to almost not work when the drill is lifted? I am o.k. with that if that is the case, but just wanted to make sure this response is normal, not an indication of some issue in the system.
 
   / Hydraulic question on a Kubota M 6800 #4  
I would say you are right at the point of maxing out your 3pt and when you use the loader it opens the relief valve, then loader well work slow or not at all.
 
   / Hydraulic question on a Kubota M 6800 #5  
By neutral, I mean you have the load whee you want it, and then you go to neutral. This locks the 3pt in place and no fluid gets in or out.

With the 3pt in neutral, the fluid from the pump flows through the 3pt valve with no resistance.

Also when using the FEL, it is first in the series flow path and it has priority, and there is usually no fluid available for the 3pt, unless you are in the feather mode. Then the fluid is shared by the FEL and the 3pt, assuming the 3pt is not fully loaded.

Try not to use both at the same time.
 
   / Hydraulic question on a Kubota M 6800 #7  
What position are you in on the 3pt if you are not raising or lowering? That means that the 3pt cyl is getting no more fluid and not dumping fluid.

If your piston or the 3pt valve is not leaking, the load will stay where it is in neutral.

Excerpt:

The position of the control valve determines where the oil goes next. If the control valve is in neutral, the oil is simply directed back into the reservoir (transmission housing). If raise is selected, the oil from the pump is directed, by the control valve, into the lift cylinder, causing the lift arms to rise. If lower is selected, the oil from the pump is directed, by the control valve, to the reservoir (just like neutral); however, a passage is also opened which will allow oil to escape from the lift cylinder, allowing gravity to lower the lift arms.
 
   / Hydraulic question on a Kubota M 6800 #8  
3-Point Hitch:
Rear Type: I,II
Rear lift: 4550 lbs [2063 kg]


Above information for the Kubota M6800. So put that 3000 pounds back a little farther and chances are you are at the three point limit as per Leejohn.:)
 
   / Hydraulic question on a Kubota M 6800
  • Thread Starter
#9  
I had my drill raised to the max with my 3 point. I then tried to raise and lower the FEL. I was going up my trailer ramp. Wanted drill high for clearance and had to raise FEL to clear ramps, but then needed to lower FEL as i went up to keep center of gravity low. Thats when it was slow to respond.

Still confused on "neutral". How do you put 3 point in neutral if it is raised to max? If it is not either going up or down, is it not in neutral? If i was not moving the drill with the 3 point, why was it using hydraulics if the valve was closed? Sorry but i am a hydraulic simpleton.
 
   / Hydraulic question on a Kubota M 6800 #10  
Still confused on "neutral". How do you put 3 point in neutral if it is raised to max? If it is not either going up or down, is it not in neutral? If i was not moving the drill with the 3 point, why was it using hydraulics if the valve was closed? Sorry but i am a hydraulic simpleton.

I'm confused as to what the heck JJ's talking about also.
 
 
Top