BX24 blowing hydraulic filters

[TMGT]

The OP didn't say what the loader was doing when pressure was measured. That pressure should vary from (0) psi to full relief pressure (2900 psi) depending on what they are trying to lift . 1250 psi is about right for just raising and lowering an empty FEL.

There are a number of other ports where a pressure gauge can be hooked up. Basically anywhere that there is a relief valve, a pressure gauge can be hooked up. That is why the Amazon gauge kits come with so many adapters, gauges, & hoses. There are lots of relief valves identified in the WSM. One of them is not doing its job. It should pretty obvious because it should be hot and rattling and squealing.

We never did ask what hydraulic oil was used to replace the old when you replaced the first filter? Can you find a can and copy the label? Old hydraulic oil is sort of milky and stringy if it has gotten water in it.

Factory relief on the loader circuit is about 1750psi, empty loader lift is maybe a couple hundred psi.

The filter on the BX is part of the hst circuit, he'll have to find the test ports on the hst to check those pressures. I haven't had to do pressure test on a BX but I imagine it similar to the B7200 I had to test a while back, should be some plugged ports on the hst assembly itself to check the different circuit pressure.

I would like to see what the filter looks like, only seen interior of filters collapse on suction due to restriction or blow out the can from overpressure (or blow the threads off the mount!).

 

[WranglerX]

What bothers me is everybody is saying filter is in hydraulic circuit which I interpret as high pressure side.... Confused as to whether filter could stand 1700-1800 PSI... Would seem to me filter would be on low pressure return to tank side, or suction side....

 

[dicktill]

What bothers me is everybody is saying filter is in hydraulic circuit which I interpret as high pressure side.... Confused as to whether filter could stand 1700-1800 PSI... Would seem to me filter would be on low pressure return to tank side, or suction side....

I think that the hydraulic filter is on the return flow from the steering valve, just as it is on the Massey Ferguson GC's. That's what the diagram that @rScotty posted above (post #31) shows. On the Massey Ferguson GC's that pressure is controlled by the power take off (PTO) relief valve set at ~79 psi. If that pressure relief valve were jammed open than the pressure could be much higher and could be causing the filter to blow.

Sorry, on edit, that doesn't make a whole lot of sense. The relief valve is normally open most of the time as the flow has nowhere else to go unless the PTO valve is open, and then that flow isn't much. Jamming it shut would increase the pressure, but the filter shouldn't see that. So, seems like it needs something downstream of the filter to cause such a high pressure. IDK (I don't know) ....

 

[altoonapillarrock]

I am 83 and I have learned so much about my 2008 BX24 from tractor by net and the occasional YouTube video. Thanks so much to all you folks who contribute.

 

[oldnslo]

What bothers me is everybody is saying filter is in hydraulic circuit which I interpret as high pressure side.... Confused as to whether filter could stand 1700-1800 PSI... Would seem to me filter would be on low pressure return to tank side, or suction side....

On the BX the factory filter is in the charge pump circuit for the HST. So low pressure circuit

Standard spin-on filters are typically rated for around 100 - 150 PSI with normal operation at 50 PSI or less.

I do not recall if it has been confirmed that this is the filter in question but suspect that it is.

 

[TMGT]

On the BX the factory filter is in the charge pump circuit for the HST. So low pressure circuit

Standard spin-on filters are typically rated for around 100 - 150 PSI with normal operation at 50 PSI or less.

I do not recall if it has been confirmed that this is the filter in question but suspect that it is.

It is, the only cartridge filter is the hst filters, the only other hyd filter is the suction screen. I couldn't remember the exact pressure of the charge circuit but most are only 1-200psi.

I would really like to see what the failed filters look like.

 

[TMGT]

To the OP, does the filter fail immediately or only after an operation, like driving or turning or using the PTO?

 

[rScotty]

Sad to say, but most older tractor hydrulic problems are due to contanimated fluid that forms globs that won't pass through the various ports. Then those blobs cause an intermediate failure which puts more crud into the system. There never was anything wrong with it except age & old fluid

My guess with this one is there are blobs on top of blobs of old hydraulic fluid and water all the way through blocking flow....especially where the output of the hydraulic filter enters the HST. That appears to be a complete blockage. You may have to probe that to get the goo out. Or disassemble.

The first thing to do with any older hydraulic system that begins to show problems is to drain it, flush it, clean off any cleanable filters - and run the flush through many times with an open hydraulic filter. this can take hours. Then when/if the third or forth flushing fluid begins to look like clear oil again, put in real transhydraulic fluid and a filter.

This should have been done when the first filter failed....all my opinion, but does anyone have a better?

rScotty

 

[Suki]

doesn't adding shims increase the pressure?

Went with no shims.

 

[Suki]

Sad to say, but most older tractor hydrulic problems are due to contanimated fluid that forms globs that won't pass through the various ports. Then those blobs cause an intermediate failure which puts more crud into the system. There never was anything wrong with it except age & old fluid

My guess with this one is there are blobs on top of blobs of old hydraulic fluid and water all the way through blocking flow....especially where the output of the hydraulic filter enters the HST. That appears to be a complete blockage. You may have to probe that to get the goo out. Or disassemble.

The first thing to do with any older hydraulic system that begins to show problems is to drain it, flush it, clean off any cleanable filters - and run the flush through many times with an open hydraulic filter. this can take hours. Then when/if the third or forth flushing fluid begins to look like clear oil again, put in real transhydraulic fluid and a filter.

This should have been done when the first filter failed....all my opinion, but does anyone have a better?

rScotty

So the hydraulic fluid but will certainly let the guys know. Our friend, a. hydraulics guy has been doing some research and after all the testing, thinks a valve may be stuck. Also, not sure why the pressure test happens where it does and not in the line itself. Will keep everyone posted.
We are also checking to make sure correct filters were sent from Kubota.