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Allis Chalmers Discussion Forum
:

power director prolem??

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NWMO 901 SOS

11-28-2007 20:42:19




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Hello again,

Short recap. Friend"s D17 went kaput some time back and we have been waiting to get a shed built to work on it. It"s sitting where it quit, with these reported symptoms:

1) starts fine and sounds good (with clutch in)
2) let clutch out and tractor dies, no horrible noises
3) with clutch in and transmission in nuetral, tractor will roll and can be pulled. Let clutch out, wheels lock up.

I am pretty green and was going down the path of the transmission being stuck in two gears causing the bind and the engine to die. However, after studying I&T AC-13 and looking at Dan"s awesome pics, it would seem if the tractor will roll, the pinion and gears must be moving freely in the tranny and thus be in Nuetral. If stuck in two gears, it appears that would lock the pinion shaft and therefore the rearend making it impossible to roll.

If I am correct (and may not be), it would seem with the transmission clutch in and the tranny in nuetral, the problem area is isolated to the "power director" and/or trasmission input shaft.

Is my deduction reasonable and if so, what is the best starting point? We have a manual (AC-201) on the way, I just like to give myself some time to ponder and better understand the possible problems. TIA for any input.

Chris

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NWMO 901 SOS

11-29-2007 13:51:46




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 Re: power director prolem?? in reply to NWMO 901 SOS, 11-28-2007 20:42:19  
Thank you Texas Denny,

I'm only a shadetree mechanic and wasn't sure if I was thinking right or not. I appreciate the time and effort you took in responding. I will see my friend shortly and have him review my symptom description to confirm its accuracy. Thanks again.

Chris



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Texas Denny

11-29-2007 13:38:09




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 Re: power director prolem?? in reply to NWMO 901 SOS, 11-28-2007 20:42:19  
I've reread your message three times with hours between each reading. I think you are correct in most of your diagnosis. If the transmission were locked in two gears, you would not be able to get it to roll no matter where the shift lever is. Therefore the transmission is free. The problem could be in the power director but, to me, that doesn't seem likely. But it is possible. There are other sources.

Was the oil level correct in the power director? There are two other possible sources. First the power director has a shaft driven gear pump. If one of these gears lost a tooth, I think that would stop everything. Again it is unlikely. Also, the hydraulic system is between the engine clutch and the transmission. If the hydraulic oil was run low or out, the pistons might gaul in their cylinders and freeze up. This isn't uncommon but they usually freeze in the in position and don't keep the cam from turning. And of course there are a bunch of bearings.

So all of the possible problems seem unlikely but clearly one of these unlikely problems has happened.

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NWMO 901 SOS

11-29-2007 18:54:24




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 Re: power director prolem?? in reply to Texas Denny, 11-29-2007 13:38:09  
I would like to add that this tractor was parked outside during cold weather and frozen water may have contributed. Just speculating as I've not seen the tractor yet and don't know if there was water in any of the fluids.

Chris



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Texas Denny

11-29-2007 19:23:55




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 Re: power director prolem?? in reply to NWMO 901 SOS, 11-29-2007 18:54:24  
Yes, that could be an issue. I have a tractor right now that could not be shifted when I bought it. When I got into it, two gears had so much rust that they couldn't turn. Oddly enough, they did clean up well and make no noise. Water would be especially bad for the hydraulics.



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NWMO 901 SOS

11-29-2007 08:08:02




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 Re: power director prolem?? in reply to morton, 11-28-2007 20:42:19  

Kentb of SWMO said: (quoted from post at 09:20:02 11/29/07) One of your symptoms does not make since. You say with the trans in neutral and the clutch in the tractor will roll but the wheel lock-up when you let out the clutch. the tras should still be in neutral and should still roll. The only way this could happen is for you to have a shifter problem in which the tractor is still in gear even though the shifter LOOKS to be in neutral.
Kent


Kent,

Thank you for your response. I am working with second hand info and I apologize. I assume before letting the clutch out, my freind must have put it in gear, or yes, it would still roll freely.
If the transmission were stuck in two gears, the tractor wouldn't roll under any circumstance would it? Transmission tied directly to pinion gear controlling rear end, axles, etc. Thank you again for your help.

Chris

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Kentb of SWMO

11-29-2007 06:20:02




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 Re: power director prolem?? in reply to NWMO 901 SOS, 11-28-2007 20:42:19  
One of your symptoms does not make since. You say with the trans in neutral and the clutch in the tractor will roll but the wheel lock-up when you let out the clutch. the tras should still be in neutral and should still roll. The only way this could happen is for you to have a shifter problem in which the tractor is still in gear even though the shifter LOOKS to be in neutral.

Kent



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NWMO 901 SOS

11-28-2007 20:48:38




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 Re: power director prolem?? in reply to NWMO 901 SOS, 11-28-2007 20:42:19  
Early D17, serial # < 24,000.

Chris



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