1370 powershift kills engine, revisited...

wore out

Well-known Member
https://forums.yesterdaystractors.com/viewtopic.php?p=10766549&highlight=#10766549

I haven't been able to get back to the tractor, as it is snowed in out in a field 'til spring.

Just a thought, if they overfilled the main case with hydraulic oil, by say 5 or 10 gallons, would that cause the P.S. transmission to ''kill'' the engine as soon as the ''clutch'' pedal is released?

Before winter closed in I did check for stuck shift valves (they weren't) and in thinking about it oil drained out of the lower ones at a high flow (engine NOT running, of course), getting me to thinking they may have filled the oil well above the upper sight glass.

I didn't think at the time to check for the oil being overfilled, just now thinking about it and wondering if could be what happened as the transmission had been working normally before the hose blew, and they added oil after repairs were made.

Anyone got any comments on that possibility?
 
(quoted from post at 15:23:30 01/24/23) https://forums.yesterdaystractors.com/viewtopic.php?p=10766549&highlight=#10766549

I haven't been able to get back to the tractor, as it is snowed in out in a field 'til spring.

Just a thought, if they overfilled the main case with hydraulic oil, by say 5 or 10 gallons, would that cause the P.S. transmission to ''kill'' the engine as soon as the ''clutch'' pedal is released?

Before winter closed in I did check for stuck shift valves (they weren't) and in thinking about it oil drained out of the lower ones at a high flow (engine NOT running, of course), getting me to thinking they may have filled the oil well above the upper sight glass.

I didn't think at the time to check for the oil being overfilled, just now thinking about it and wondering if could be what happened as the transmission had been working normally before the hose blew, and they added oil after repairs were made.

Anyone got any comments on that possibility?

It was Case's recommendation to run 5 gallons over full because of lower shaft lube issues. That will cause no issues. If you are sure there no stuck pilot spools then there must be internal issues with the clutch packs. Stuck pilots cause the symptoms but if the unit was run with stuck pilots the clutches will be destroyed.
 
Thanks for the reply.

Ir will be interesting (in the spring) to get at it and find out what's REALLY going on.

As you well know one can't always take the operator's story at it's word, but the story is they blew a hydraulic hose, quickly shut the tractor off, and refilled the oil before running it again, and that's when the issue cropped up.

It wasn't doing hard fieldwork, he was moving round bales with the loader when the hose blew.

Seems STRANGE.
 
On the valve body plate there are 5 test ports, one for each clutch and one lube pressure, there may only be pressure at 2 ports at any time, 1st PS =C1-C2-------2nd PS=C1-C3-------3rd= C2-C3. Reverse C2-C4. Clutch down no pressure on C2 in any PS position. C2s pressure should vary as you move the inching pedal up and down as C2 serves as the master clutch. The best way would be to have a 4 gauge manifold set of gauges and have all hooked up at once so you can watch all the gauges. With more than 2 clutches at once pressurized, damage will be very quick so you may have to start and watch and shut off quickly. System pressure should be 180-210 and I like them at top of spec. Lube pressure 75 lbs or close. Unless there is something very rare going on, pressure on more than 2 clutches is a pilot spool issue. If you find pilot spool issues, please get back on here and we will tell you how to free them up without destroying the spool or it's bore.

This post was edited by mEl on 01/25/2023 at 02:05 pm.
 

Thanks for the comeback.

Yes, when the snow leaves and I can get back to it that was my plan, to monitor all 4 clutch pressures.

To be clear, I have verified that all 4 pilot spools are free in their bores in the valve body and springs are intact.

I bought the tractor MANY years ago with gear transmission problems and a failed planetary final drive, and I split it back to the gear transmission and repaired it, then sold it to the current owner.

He used it for many years for haying and had NO problems 'til this happened a few years ago and it was parked/abandoned.

Late last fall the owner was wondering if I wanted to buy it back in it's current condition, and I went and started to check it out.

The starter would hardly crank the engine, so I removed it for repairs and checked the pilot spools while I was there.

Then winter closed in before I got the starter back on so I could proceed with figuring out what's going on.

I've been researching and thinking this over as I wait for spring.

I'd like to get it back to my place and functioning and install and 8' Erskine snowblower that I have on it.
 

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