8430 4wd transmission pressure

well i bought the 8430 today that i asked about a couple weeks ago with the seized up top shaft. it is seized in the 1-2 gear so it took me close to 7 hours to drive it 90 miles home in D2. after i was going a while and everything was warmed up the pressure gauge by the shift quadrant was about 11:45-12 o'clock position in high and was right on the line on the gauge face in low. that was at 2200-2250 rpm. does that sound kinda low? it was about 20 degrees out so how much will it change when its 60-70-80 degrees out and actually working the tractor instead of just driving down the road.

also there is a puddle of oil in the cab under the seat that i didn't notice when i left the place, don't think it was there when i was looking over the tractor, where could that have came from? i didn't notice anything obvious out side the cab when i got home and it doesn't appear to be coming from the steering/dash area.
 
IIRC, that gauge is for transmission LUBE pressure, which is basically the oil flow that is left over after the needs of the main clutch and 2-speed are met, (oh, yeah, and the PTO clutch and brake) and varies with engine speed and oil temperature/viscosity.

It's the least of your worries at the moment, 'til you get the main issue fixed, and check the sump screen and change the two filters.
 
yeah i was wondering if there is anything i would need to check while i'm in the transmission or if the issue, if its an issue, is else where on the tractor. i don't know where the gauge would normally run as i haven't spent any measurable amount of time in a 30 series 4wd since i was about 5.
 
(quoted from post at 14:40:26 12/14/19) do you know what tests i would need to do to determine what/where/if there is an issue with the pump or a seal somewhere?

The factory technical manual has a VERY detailed troubleshooting flowchart.

The point I was trying to make is that transmission lube pressure is very different than engine oil pressure, as the clutch pump oil flow left over from supplying the engine clutch, the PTO clutch or brake and the planetary two speed clutch and brake is dumped back into the sumps by being channeled through various ports and hollow-drilled shafts to trickle out and lube and cool various components. Unlike an engine, there are few "friction" bearings or seals in the transmission that are likely to wear or fail in such a way as to affect transmission lube pressure.


The main factors are that the clutch pump has adequate capacity and there are no significant leaks in the hydraulic systems that operate the clutch, PTO clutch or brake, and two-speed.
 

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