BX 23 Relief Valve location

[srossman]

Ok, so I've been following another thread in increasing the relief valve pressure on my BX 23 and I've tested it and found that my pressure is down a bit. I've searched and searched for the location to put in a few shims to increase the pressure and I can't find it. Can anyone give a very detailed location or have a picture of where to adjust the pressure on my BX 23.

Thanks,
Scot

 

[tommu56]

Here is a couple of pages if I can get them attached


tom

 

[srossman]

Thanks Tommmu, That is exactly what I was looking for. Now if it will just warm up a little bit, I can get out there work on the tractor. 27 degrees is a little to cold to be fiddling with this stuff outside.

 

[tommu56]

Yea I need it to warm up too I "tried" to get to my cabin last weekend and slid off the road on the ice and did over $6000.00 in damage to it.
come on spring!

tom

 

[ibnxe]

My BX23 has a bit over 300 hours now, and seems to have lost some of it's grunt. I am collecting the pieces to test the releif pressure myself. The location information is great, but what is the correct releif pressure for this tractor?

 

[FishAlaska]

Be careful what you wish for. I boosted my BX24 and yes it has more power but it will make it more noisy and it appears my abrupt stop in reverse got way worse.

 

[srossman]

My BX23 has a bit over 300 hours now, and seems to have lost some of it's grunt. I am collecting the pieces to test the releif pressure myself. The location information is great, but what is the correct releif pressure for this tractor?

I think the correct pressure is somewhere around 1850 PSI. I boosted mine to about 1900 -1950 when it was all done. The documents that Tommu provided were dead on. Once I had them in hand it was a couple of hours and the job was done.

 

[radioman]

Be careful what you wish for. I boosted my BX24 and yes it has more power but it will make it more noisy and it appears my abrupt stop in reverse got way worse.

Wow- that is important info need to know! The reverse can get worse with bumped up power. . Now I gotta figure if this is worth it or should I get into swapping out shims as needed? If all I am doing is mowing, what happens if I lower the power from the way it is now, will the reverse become softer ?

 

[Yankee Clipper]

The two circuits are not related other than the same fluid is used.

Shimming the system rellief will have no bearing at all on the hydro - must be one of those perceived differences.

The hydro reaction is due to no dampening of the hydro linkage as was found on earlier machines.

 

[tommu56]

Be careful what you wish for. I boosted my BX24 and yes it has more power but it will make it more noisy and it appears my abrupt stop in reverse got way worse.

I don't think the reverse and the pressure boost on the hydraulic is is related.

They have same fluid and sump but different pumps and circuits completely.

tom

I guess Yankee Clipper is a faster typer than I am.

 

[radioman]

ok- any volunteers to prove this ?

 

[ACHINBAC]

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]

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]

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]

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

 

[tommu56]

Here is the 23 hydraulic circuit

tom

 

[FishAlaska]

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]

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]

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]

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.