Kubota Hydraulic pump adjustment

   / Kubota Hydraulic pump adjustment #1  
Joined
Aug 12, 2007
Messages
6
Does anyone know how to adjust the hydraulic pump on a B3030? I want to wet it down when friends borrow it (very rare occasion, but it does happen).
Mike
 
   / Kubota Hydraulic pump adjustment #2  
"Wet it down" ???

Do you mean you want to decrease the hydraulic pressure so you friends don't destroy the tractor? If so, I can help a small amount. This is L 10 series information, but it is probably the same on your B. Under the operators right foot, under the floor board is a hydraulic block. It will have the hoses coming from the loader. In the owners manual it probably tells you how to turn a knob there if you ever take off the loader. Anyway, that block holds the SYSTEM pressure relief valve. Lay on your back and look up at it. There is a bolt looking deal on one side. Take it off and you will find there is a spring and some washers and maybe the relief popit too (mostly it will stay put). Not much fluid will come out, about 2-4 oz. The spring pressure controls the system pressure. You increase it by adding washers. 0.10 mm of washer = about 34 psi pressure change. Target is about 2500 psi.

There may only be 1mm or less of washer in there. If you want to really drop the power, you may have to go to a custom spring.

Hope that helps!
jb
 
   / Kubota Hydraulic pump adjustment #3  
Mike,

The system relief valve is on the top cover - RH side - facing front behind the tractor. This would be over the RH rear tire approximately.

The long hex nut has the shims and spring inside it and you can remove whatever it takes to make it underperform. Don't loose any parts or you will have to put up with the low pressure performance as well!

I would just tell the would be borrowers to go buy a tractor like I did, but thats just me :D

Good luck
 

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