BX 23 Relief Valve location

radioman · Mar 16, 2009

ok- any volunteers to prove this ?

ACHINBAC · Mar 16, 2009

Funny thing happened to me on the way to the woodpile . . after reading Alaska's post the other day I felt he may be correct, though understand there are two discrete hydraulic circuits. Of course it could have been that cold one I drank on your behalf Radioman. Did seem more abrupt though. Regardless, the upgrade is worth the inconvenience if there is one.

Dave

FishAlaska · Mar 16, 2009

Are you sure they are on different pumps? I thought the BX only have one pump....that is why you see a decrease FEL performance while moving. If they were on different pumps you wouldnt see this performance decrease in the FEL would you?

On my BX24 if you are traveling and raise the bucket you will feel the tractor slow down a bit.....same pump and pressure for both it appears....could be way off though.

Volfandt · Mar 17, 2009

Technically the BX has two pumps.
Integral to the HST is the drive pump which provides the hydraulic power to propel the tractor. Thats it's only function.

External to the HST is the implement pump. It provides the hydraulic power to operate the implement circuit(s), i.e. the power steering, pto valve, 3ph, FEL (if installed), BH (if installed) and 3rd function valve (if installed).

There is a Flow Priority Valve that "divides" the oil flow between the power steering circuit, the PTO valve and the 3ph, FEL, BH and any other hydraulic implement control thats installed so the power steering will work when other implement controls are operated simultainiously.

Since the hydraulic drive circuit has it's own independant pump and control circuit, increasing the pressure in the implement control circuit has no effect on it.

The abrupt reverse stop isn't effected by an increase in implement control pressure.

radioman · Mar 17, 2009

thanks for the good explaination of the BX pumps Volfandt! I feel I understand my own tractor better. (easier then woman ehh?

,ducking)

tommu56 · Mar 17, 2009

Here is the 23 hydraulic circuit

tom

FishAlaska · Mar 17, 2009

According to that chart the backhoe is not affected by the relief valve either correct? It comes off between the pump and the relief valve (7).

tommu56 · Mar 18, 2009

FishAlaska said:
According to that chart the backhoe is not affected by the relief valve either correct? It comes off between the pump and the relief valve (7).

FishAlaska

The releif valve will work on all non drive curcuits.
On the pdf presure is on the left of valve and dumps out the right with the spring pictured on the bottom of the valve as the pre load to keep it closed.
Then it dumps back to the tank that is tie u shaped symbol further right of the valve withthe line running up.

tom

ibnxe · Mar 18, 2009

From the illistration of the hydraulic circuit, I would agree that there is no direct connection between the relief pressure and the operation of the HST. My tractor also stops abruptly when I take my foot of the pedal, but this only happens in low range. I think this has more to do with the spring that controls how fast the pedal returns to neutral. There is a brief description of its operation along with an illustration in the BX23 operator´s manual

Yesterday I purchased a glycerin-filled gage and connected it to an extra female quick-disconnect fitting I had lying around. I was a little surprised at only seeing a mximum 1625 PSI, and plan on boosting the pressure when I have more time this weekend. I will also verify if there is a change to the way the tractor comes to a stop.

FishAlaska · Mar 19, 2009

Please do....if you get it up near 2000 PSI....let me know if you hear anymore hydraulic noise and if the abrupt stop in reverse gets worse....I get it worse in high range.

I do have a BX24 and the extra noise I am hearing may be in the power beyond loop or BH....it just seems noisier.