Farm Equipment - 8050 power director problem-slow hi shift

8050 power director problem-slow hi shift

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Topic: 8050 power director problem-slow hi shift

Posted By: pirlbeck
Subject: 8050 power director problem-slow hi shift
Date Posted: 07 Mar 2012 at 2:49pm

I have a customer's 8050 in the shop that for the last several years he has been complaining about the power director slipping/shifting slow into the hi side. He says it only does it the first upshift of the day, that it is worse with cooler weather and that it don't do it all of the time. We have had it here before and we have put pressure gauges on the low and hi side, but have never been able to replicate the problem. He wants us to split it and pull the power director clutch out and see if we can find anything. I have never been a fan of "exploratory surgery" and I am a little hesitant to go ahead and do it.

I am wondering if either the hi side piston seals or the if the rotating piston/seal rings could be bad or leaking?

Anyone ever run into something similar??

Thanks!

pat

Replies:

Posted By: jiminnd
Date Posted: 07 Mar 2012 at 3:31pm

Had a similar problem on early 7030, was some large seals, not sure as it was fixed by dealer under warranty.

Posted By: DrAllis
Date Posted: 07 Mar 2012 at 4:34pm

If you do take it apart, be sure to replace the two discs and two seperator plates and wave springs and piston seals in the hi side at a minimum. There's only two discs, so if they are worn/polished a lot they could do that....never slip under a pull once locked up, but slow to complete an upshift.

Posted By: SteveM C/IL
Date Posted: 07 Mar 2012 at 7:02pm

Well,on the lighter side,it isn't hard work-just time consuming.Be sure to have a service manual handy.

Posted By: pirlbeck
Date Posted: 07 Mar 2012 at 8:04pm

jininnd & DrAllis,

I was working at an AC dealer when the 7030 & 7050 first came out and we got into quite a few of the early P/D clutches. The piston seals had a problem with not applying properly with hot oil. The symptoms of that were you would let the clutch pedal out and the trans lube pressure light would come on and the tractor would not move. Usually, the operator would start revving the engine up and then the clutch would lock up and the tractor would take off pretty suddenly. The fix for that was to drill some small holes in the piston to direct oil under the lip of the piston seal. The factory fix on new pistons was to machine a chamfer into the OD and ID of the piston to allow the apply oil to get under the seal lip.

The other reason we commonly got into the P/D clutches was because of slow lazy shifts into hi side. The early tractors used a clutch separator plate that was stamped out of sheet steel and it was not at all flat. These stamped separator plates were replaced with a plate that was surface ground, which made the clutch a lot more aggressive.

We did both updates to every clutch we were into.