BX24 blowing hydraulic filters

[KWentling]

A note of caution: Running hydrostatic trans without charge flow for any period of time will potentially damage the hydrostatic pump. It relies on the charge pressure for hydro-dynamic lubrication for rotating group when in neutral.

Good point. I would expect within a few seconds one would know one way or the other.

 

[grsthegreat]

You ever think about rehooking the backhoe, reconnect hoses and see what happens?

 

[jyvas12]

If it were mine, I would clean the relief and make sure the "spool" slides freely in the bore. Might even be tempted to bump the starter to flush a little oil out. Reassemble and give it a try. If I wanted to test the pressure, I would rig hose to the test port, to a tee with a pressure gauge and a ball valve so I could block the flow. I would start the tractor with the valve mostly open and then close it down watching the gauge. If it rises over the 71 psi as the valve is closed you would know there is still a problem.

When you say "spool" do you mean the spring? I have seen this word, but I am not sure if that's what they mean. I did see the spring and the ball bearing, and everything seems easy to move in and out. thanks

 

[jyvas12]

Thanks K

Those diagrams kind of confirm that if flow does not get to or through the charge relief the filter would see excessive pressure.

Jyvas,
Did steering or implements functions stop working or change speed before the filters failed?

I would not try operating the tractor until you feel confident the problem is resolved or you may damage something else from the excess pressure.

Everything seemed fine right up to the point of blowing out the filter. I backed up to a flat surface as it was pissing out and shut it off. it was definatly a sudden problem, not a slow workup.

 

[oldnslo]

Everything seemed fine right up to the point of blowing out the filter. I backed up to a flat surface as it was pissing out and shut it off. it was definatly a sudden problem, not a slow workup.

If sudden then need to find what passage or flow path is plugged from the filter into the hydrostatic curcuit. I believe the filter flows from outside to inside so path in question would be through the filter mounting stud into the HST.

When you removed the charge relief did oil pour out of that opening? It should connect directly to the transaxle reservoir and I would think below oil level but not 100% certain of that.

Did you try turning the engine over with charge relief removed to verify flow to the charge relief?

Or with filter off and relief removed blow some air through from filter to see if air and oil come relief port. Don’t get crazy with air pressure since this circuit is only supposed to run 70 PSI max.

If air blows out relief possibly try putting relief in without spring and ball. Remove trans fill port cap and gently blow some air into the filter stud. Should just make bubbles in the trans reservoir if path is open with little to back pressure. Again low pressure since don’t want to damage anything further.

Keep everything as close to surgically clean as possibly.

If air seems to flow then try installing the charge relief assembly and see if any air flows past it if you can seal the connection to the filter stud. I have a rubber tipped air nozzle so it might work. Be extra nice if had some way of regulating air pressure into that filter - charge assembly.

I know easier for me type than doing the actual oil in your face testing..

 

[KWentling]

When you say "spool" do you mean the spring? I have seen this word, but I am not sure if that's what they mean. I did see the spring and the ball bearing, and everything seems easy to move in and out. thanks

Not the spring. In this case it would be ball.

 

[dougtrr2]

Anyone else think we may be getting trolled by AI or a person? Three people have claimed to have this filter blowing up issue. BUT, all three are new members that haven't posted anywhere but this topic, and none have answered my question on the specifics of what "blowing up" a filter means.

Doug in SW IA

 

[RjCorazza]

I skimmed this thread, and don't have much technical knowledge to add. I will say that the filters themselves can operate on the edge of failure.
We had a cold snap years ago (unusually cold) and my L3410 "blew out" the HST filter (blew seal at base resulting in gallons of fluids lost in seconds). Further investigation revealed an internal Kubota service bulletin that recalled the filters in the geographic area just north of me. I don't remember the wording, or if there was an actual recall, but the filter design was determined to be insufficient in cold climates.

 

[JPGR]

Thanks for the response's, when I say it blew out I mean the seal blew out or the pressure blew the filter off the inside of the canister. It did not rupture the can. I have cleaned everything I can think of and only use Kubota parts.

 

[JPGR]

Anyone else think we may be getting trolled by AI or a person? Three people have claimed to have this filter blowing up issue. BUT, all three are new members that haven't posted anywhere but this topic, and none have answered my question on the specifics of what "blowing up" a filter means.

Doug in SW IA

just did