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Case Tractors Discussion Forum

Power Shift on Case Ih 3394 MFWD

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Dennis Tanner

10-26-2009 23:02:22

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My brother is having problems with the Power Shift/transmission on a 1986 Case IH 3394 MFWD. He has had two different mechanics work on the transimission Power Shift and they haven't been able to fix it. Several relays have been replaced and one mechanic says he thinks it might be a bad ground or possibly an O ring. Evidently after the 87 models they abandoned the electrical controls Have any of you had similiar problems with this model? Can you give me any suggestions as to places to look to find more information for my brother and the local mechanics. Have their been any dealer service bulletins, etc? How would I find information on a 1986 model? Thanks Dennis

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10-27-2009 19:15:06

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 Re: Power Shift on Case Ih 3394 MFWD in reply to Dennis Tanner, 10-26-2009 23:02:22  
You need to take it to a dealer familar with the Case RPS34 powershift. There is a electronic test unit commonly known as the Yes - No box and along with a 12 gauge bar set it will take it through the complete checklist and they can see what each clutch is doing during each shift as far as leakage and fill time and drop out time, and do electrical tests at the same time. Being that you have C5-C6 it is a 24 speed which means there are 4 soleniods on the right side and two on the left side being C5,C6

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Dennis Tanner

10-27-2009 12:20:50

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 Re: Power Shift on Case Ih 3394 MFWD in reply to Dennis Tanner, 10-26-2009 23:02:22  
Thanks for your replies, here is a little more information. A mecanic/shop foreman for the case dealership who is now in his own shop has worked on this tractor as well as a mechanic from the case Ih dealership in the area. Evidently the Circuitry board went out and has been replaced, as well as the solonoids for C5 and C6, and the two high pressure switches near C5 and C6. When the circuitry board went out they lost all of the odd gears. When they were using the tractor this spring the circuitry board is popping or clicking when you shift gears. When you push in the clutch you can hear clicking and a little time passes before it shifts into the gear selected. It appears that the delay in shifting is caused by the time it takes to build up the necessary pressure? I was told that they could use the tractor for discing, running in 3rd gear and just throttling down for turning, not shifting down, and raising and lowering the disc. The transmission seems strong, and the problem appears to be the power shift. My brother is trying to decide if it is worth breaking down the transmission, or calling it a "Parts tractor". We appreciate your comments and suggests and welcome more questions. Thanks, Dennis

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10-27-2009 17:32:57

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 Re: Power Shift on Case Ih 3394 MFWD in reply to Dennis Tanner, 10-27-2009 12:20:50  
I would suggest that he get a complete "by the book" flo meter test done on it. That is the only way to isolate the powershift faults if any. Slow response could be caused by slow pressure buildup from a leaky clutch. All the systems on the tractor are dependant on pump flow and that would be evaluated as well. mEl

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10-27-2009 10:33:29

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 Re: Power Shift on Case Ih 3394 MFWD in reply to Dennis Tanner, 10-26-2009 23:02:22  
Have a 3594 that we thought had an electrical issue. We had 1, 3 and 5 on the power shift so we thought solenoid valve for 2, 4 and 6 was bad. Checked it out and it was fine. There is 2 planetary type gears for those powershifts. They commonly go bad, had to go to several junkyards to find a good set. Tractor had to be split.

Mel is right. Give us more info and he can help you out.

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10-27-2009 04:44:31

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 Re: Power Shift on Case Ih 3394 MFWD in reply to Dennis Tanner, 10-26-2009 23:02:22  
Exactly describing the problem would be a good start. The electric controls were difficult to diagnose at best as low pressures can cause switches not to open and cause problems to appear as electrical in nature when they are actually hardware failures. As with any other model there are service bulletins on every area of the tractor. There are procedures outlined in service manuals for testing these powershifts. You may get lucky plugging new relays in but not likely. You need expert help which may cost bucks. Take it to a good CaseIH dealer. These are beyond the "shadetree" mechanic level. BTW they did not abandon the electric powershift, just moved on to a completely new powershift, at no point did they go back to the old valve and lever and cable setup in these models. mEl

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Dennis Tanner

10-30-2009 17:03:31

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 Re: Power Shift on Case Ih 3394 MFWD in reply to mEl, 10-27-2009 04:44:31  
Thank you for your responses and ideas. My brother has been surprised/impressed with the ideas and help via the internet and this forum. Thanks again, Dennis

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