8050 power director problem-slow hi shift

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   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

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pirlbeck Members Profile Send Private Message Find Members Posts Add to Buddy List Silver Level Joined: 01 Dec 2009 Location: West Central IA Points: 226	Post Options Post Reply Quote pirlbeck Report Post Thanks(0) Quote Reply Topic: 8050 power director problem-slow hi shift 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

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jiminnd Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 16 Sep 2009 Location: Rutland ND Points: 2271	Post Options Post Reply Quote jiminnd Report Post Thanks(0) Quote Reply 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.

DrAllis Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Points: 21359	Post Options Post Reply Quote DrAllis Report Post Thanks(0) Quote Reply 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.

SteveM C/IL Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Location: Shelbyville IL Points: 8467	Post Options Post Reply Quote SteveM C/IL Report Post Thanks(0) Quote Reply 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.

pirlbeck Members Profile Send Private Message Find Members Posts Add to Buddy List Silver Level Joined: 01 Dec 2009 Location: West Central IA Points: 226	Post Options Post Reply Quote pirlbeck Report Post Thanks(0) Quote Reply 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.