8430 trans oil light - Page 2 - The Combine Forum
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post #11 of 19 (permalink) Old 05-24-2019, 09:14 AM
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Could the dealer have installed a "clean up" filter? It so perhaps that was slowing the flow down.

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post #12 of 19 (permalink) Old 05-24-2019, 02:14 PM Thread Starter
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Not that they mentioned, and these guys have been pretty good about being very open and honest about what's going on. I 'm still suspicious that I got a bunch of white snot out of the drill cylinders if it had been parked a while.

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post #13 of 19 (permalink) Old 06-02-2019, 11:26 AM Thread Starter
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Well... I thought we had this one solved when I changed the filters, but just as I was finishing up rolling the soys, the clutch did the 20 second delay thing again. Easy job so it wasn't being overworked or overheated, and I've never had the feeling that the clutch was slipping so hopefully (crosses fingers) this isn't going to turn into a big expensive job. I think I need to go back and check those pickup filters some of you guys mentioned. No word of them in the repair manual, only thing I could find was this schematic that seems to show 2 of them. I'm guessing the front one is only accessed when the engine is out. Back one appears to be nice handy location behind the frame rail and fuel tank under the door? Anyone know how much trans hydraulic I'm going to lose pulling the back one? I assume it's replaced from the back diff when it's running? Or is there somewhere else to refill it up front? The light on the dash hasn't come on since the filter change. Pressure gauge reading is normal.
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post #14 of 19 (permalink) Old 06-02-2019, 01:46 PM
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I wonder if a piece of filter gasket or crud got into the clutch circuit, not sure what one would do to flush it out but something to ponder anyway since it mostly works and then suddenly has a hickup.
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post #15 of 19 (permalink) Old 06-02-2019, 09:03 PM Thread Starter
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Possible... but I didn't notice any pieces of the gasket material missing... just loose.
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post #16 of 19 (permalink) Old 06-04-2019, 08:30 PM Thread Starter
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So that schematic above "seems" to show the clutch circuit picking up it's oil out of 2 locations within the clutch housing and I don't see any way to access them from the outside of the housing. Where is this pickup you guys are talking about? If it's for the hydraulics circuit, I doubt it's the issue. The only "side plug" I see on the tranny is behind the rear filter and single acting cylinder switch... a large round plug with a 1/2" square drive plug hole in it. Is that it? I'm thinking if it is, it will pretty much dump all the hydraulic oil when I pull the plug.
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post #17 of 19 (permalink) Old 06-04-2019, 10:53 PM
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There are 4 screens, one behind that plug with the 1/2" drive, forward and higher is a 1" steel line that has a compression fitting to hold it in the housing that has a screen behind it. there is another in the clutch housing and a small one in the hyd. pump that is driven by the crank. The small one and the one in the clutch have always been clean on my 8440. The other 2 plugged with brake material on my tractor from water contamination.


You will have to drain the oil to clean the back two IIRC.


At least the one with the 1/2" drive

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post #18 of 19 (permalink) Old 06-05-2019, 09:25 AM Thread Starter
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Yea... that was the answer I was hoping not to hear... but thanks for the info.
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post #19 of 19 (permalink) Old 06-07-2019, 02:34 PM
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I think you got more than a screen plugging issue, though of course, rule out the simple **** first, but I'm suspecting you got some kind of a valve issue, something is hanging up IMO. As NF said, might be some crap caught up in a spool or check valve somewhere. Def before tearing anything apart, do the full run of flow and pressure tests on the entire tranny system. If it works 99% of the time, this is an intermittent simple thing.
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