STX500 Regulated pressure problem - The Combine Forum
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post #1 of 12 (permalink) Old 04-12-2019, 04:54 PM Thread Starter
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STX500 Regulated pressure problem

Hi guys. New to forum. I'm working on a STX500 quadtrac. Park brake light doesn't turn off or does so erratically. Replaced switch in valve block. No change. Tested pressure at switch, 160 PSI. Checked regulated pressure, 160 PSI at test port by remotes. Tried adjusting reg pressure at valve above hydraulic filter by batteries. The one with 1-1/4" jam nut and 12mm allen on spool. Absolutely zero change when I turn in or out. Pulled spool out and all seems fine. Changed both hydraulic filters. No change. As I understand the system, the regulated pressure from the charge pump which supplies main pump and oil for diffs and brakes. My question is basically, where do I go from here and what could be the issue?

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post #2 of 12 (permalink) Old 04-13-2019, 01:01 AM
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So is the brake dragging?
What's the charge pressure spec?

Had a neighbour's couple years ago that had a case 4wd that the park brake would not disengage. . I believe it turned out to be a blown seal in the park brake release circuit....


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post #3 of 12 (permalink) Old 04-13-2019, 01:08 AM Thread Starter
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The brakes are releasing fine. It coasts normally.
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post #4 of 12 (permalink) Old 04-13-2019, 02:04 AM
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So the concern is strictly the light?

You tried adjusting a relief.... is the pressure out of spec?
(I'm not familiar with that particular tractor, just kicking ideas around)

Charge pressure is typically around 300 to 400 psi. ???

Could it be a wiring issue?

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post #5 of 12 (permalink) Old 04-13-2019, 09:10 AM Thread Starter
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The spec is 300 psi. I find it odd that adjusting the relief is not changing my reading. I’m sure at some point the low pressure will create problems.
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post #6 of 12 (permalink) Old 04-13-2019, 10:46 AM
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On my 2006 Stx500 there is a sensor or electrical part around the battery box related to the parking brakes that went. The parking brakes applied on their own and would not come off. Once I replaced it I was good to go and have not had problems with it since.
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post #7 of 12 (permalink) Old 04-13-2019, 11:15 AM
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Originally Posted by AnviL View Post
So the concern is strictly the light?
Normally I'm of no use in situations like this but I have a solution for this one!!!



Oh and welcome to the forum. (That's all I really wanted to say...ha ha)
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post #8 of 12 (permalink) Old 04-13-2019, 11:58 AM
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Haha... I moved onto my grandparents farm... there was a piece of tape covering the engine oil pressure light on the 276 versatile..... the sensor was broken.... so I spent the $15 and put a new sensor in it 🙂

Back on topic...
Are you sure the adjustments you attempted were correct for that circuit?
If the oil is bypassing quickly enough to be dumping most of that volume the relief will be closed completely, so an adjustment wont make any change.. [get where I'm coming from?]
Is there a way to apply pressure to the park brake circuit from say a porta power?
In doing this you can narrow down a major leak or bypass.... should be able to pressure up that circuit to 300psi and it should hold that pressure for at least a few minutes... I would think.
If its bleeding pressure off you would find a blown seal somewhere.

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Last edited by AnviL; 04-13-2019 at 12:09 PM.
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post #9 of 12 (permalink) Old 07-04-2019, 12:36 PM
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im having the same problem on our 385 quadtrac. what did you do to fix your problem?
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post #10 of 12 (permalink) Old 07-04-2019, 01:23 PM Thread Starter
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Easy problem to fix. It ended up being the hoses at the charge pump were swapped. They look like. The hose coming from front of tractor would go on front of pump but it actually goes on rear. Easy to screw up and easy to fix.

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