Kubota B 1402 hydraulics overload protection

[Rosohatica]

Hi all, I have the title tractor. The hydraulic lift I think is rated to power of lifting of cca 200 kg. What would happen if I try to lift more than that, or if something heavier fell down on the lifting arms? Would it damage hydraulics or there is some kind of overload protection built in?

Thanks in advance.
Dario

 

[mcfarmall]

The systems internal relief valve would open and your tractor would not be damaged if you tried to lift something too heavy. If an elephant fell into the loader bucket while you were using it to trap butterflies, you might blow a hydraulic hose as the fluid would be trapped between the cylinder and loader valve with nowhere to go.

 

[Rosohatica]

The systems internal relief valve would open and your tractor would not be damaged if you tried to lift something too heavy. If an elephant fell into the loader bucket while you were using it to trap butterflies, you might blow a hydraulic hose as the fluid would be trapped between the cylinder and loader valve with nowhere to go.

Thanks, the elephant/butterfly gave me a laugh
What happened in real life situation is that I used hydraulics (via horizontal bar) to lift the heavy trailer arm until I hooked it to the tractor. Then I forgot to put the horizontal bar down which means the trailer arm has been leaning on the hydraulics while driving. No problem on the flat ground. But then I went over the bump in a terrain ( small hill) which made the whole trailer weight lean onto the horizontal bar attached to hydraulics. So I was wondering if it could have caused any damage?

 

[mcfarmall]

My mistake, I thought you were talking about the front end loader, but you were talking about the 3 point hitch. Either way the answer is pretty much the same.

 

[Rosohatica]

My mistake, I thought you were talking about the front end loader, but you were talking about the 3 point hitch. Either way the answer is pretty much the same.

So, if I got it right the systems internal relief valve would open if too heavy object would either be leaned on a 3 point hitch being at static position or if one would try to lift something too heavy?

 

[TheOldHokie]

Thanks, the elephant/butterfly gave me a laugh
What happened in real life situation is that I used hydraulics (via horizontal bar) to lift the heavy trailer arm until I hooked it to the tractor. Then I forgot to put the horizontal bar down which means the trailer arm has been leaning on the hydraulics while driving. No problem on the flat ground. But then I went over the bump in a terrain ( small hill) which made the whole trailer weight lean onto the horizontal bar attached to hydraulics. So I was wondering if it could have caused any damage?

I dont know the specifics of your tractor but generally 3pt lift arms have a relief valve in the lift circuit that protects against thst sort of overload. When you hit a bump that causes a shock load (pressure spike) in the lift circuit the relief opens and the lift will drop enough to absorb the shock. Loaders generally lack this feature.

There is a different relief valve tha limits the pump pressure when the loader or 3pt lift is engaged to lift a load.

Dan