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TW10 - Dual Power Shift

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HeyPigFarmer

12-30-2007 10:16:54




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On our 1979 TW10 when you shift the dual power either up or down it slams in extremely hard. Still new to this thing, didn't know if it should be a point of concern yet or not. There is nothing gentle about the shift, nearly lifts the front wheels when shifting on the road.
An update on some of my other issues. 2 sending units and the oil and temp gauges work, still no luck on volt/amp gauge. The factory battery box was rotten, imagine that, so some time with a metal break, torch, angle grinder, wire welder it now has two 1000's in there and it looks like the factory box complete with lid. A starter rebuild with new cables. Still started hard and had low power (I know the starter won't increase power output) so I got the bright idea to replace the line going into the pump from the second filter with clear hose, presto chango air in the fuel and lots of it. All new lines starts like a champ and doubled the power. Diff lock doesn't work yet, getting around to that one, still have a long way to go before spring.

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HeyPigFarmer

01-02-2008 18:52:24




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 Re: TW10 - Dual Power Shift in reply to HeyPigFarmer, 12-30-2007 10:16:54  
Thanks for everyones input so far. Like I said still learning.



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HeyPigFarmer

01-02-2008 18:15:23




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 Re: TW10 - Dual Power Shift in reply to HeyPigFarmer, 12-30-2007 10:16:54  
Well, not shifting it in the higher gears makes sense because those are the only ones that it seems really harsh in. In the field I hardly ever use it because it has good enough hydraulics to that I don't slow down on the ends. I know my dad never does other than to set the correct speed for the equipment. I'm just still not used to this thing and I didn't know if it should coast on the down shift like an IH-Torque amp or what it was supposed to do, that's what I don't like about buying equipment I'm not familiar with. I'm trying to explode the thing and didn't even know.
Another diff lock question. I tried to pull it up and turn it, but I didn't twist very hard because I don't want to break it yet, either way it didn't come up any. How far should that pedal move? Right now I have maybe a little over an inch and I can see under the cab where it goes into the control box and that is moving in and out but should I have more travel than that?

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sotxbill

12-31-2007 13:14:30




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 Re: TW10 - Dual Power Shift in reply to HeyPigFarmer, 12-30-2007 10:16:54  
YES, dual power shifts in higher gears are pretty rough so i dont recommend them..

but the locking rear..if its a rowcrop, you can have the button/lever set in the off position.. you have to pull it up.. and turn it half a turn and lower it to engage the roll pins to make the diff lever raise up.. then you can push lever down and push the spring loaded pin in the the side of the housing... hth.. bill

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edhOH

12-31-2007 09:19:29




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 Re: TW10 - Dual Power Shift in reply to HeyPigFarmer, 12-30-2007 10:16:54  
I don't want to contradict Bern, as I have read his posts for some time and he is far more knowledgeable than I on the actual inner workings. However, I did want to relay my own operating experiences. First, as the others have said, I wouldn't shift the DP in road gears. The main thing we used the DP for was to reduce speed at the end of the field when turning, and yes, it was a jolt if you weren't used to it. We had an 8700 and 7000, both with DP, and both had a pretty good jolt each time you shifted. On the other hand, we had both tractors for many years and many hours, and never had a lick of trouble with the DP.

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Bern

12-30-2007 18:24:59




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 Re: TW10 - Dual Power Shift in reply to HeyPigFarmer, 12-30-2007 10:16:54  
Those dual powers shouldn"t shift that hard, especially the older ones. The 5 series shifted somewhat hard, but not the 10 series. Makes me think something is really wrong inside. Possibly the wrong clutch disc also, it should be dampened.



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paul

12-30-2007 15:41:53




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 Re: TW10 - Dual Power Shift in reply to HeyPigFarmer, 12-30-2007 10:16:54  
I'd not use the DP in higher gears at fast speed. It is not feathered, it is a jolt to the system. They work well, but they are an on/off switch.

Keep us updated on the diff lock, my TW-20 is the same. Haven't looked at it at all, haven't needed it - but like to know.

--->Paul



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kyhayman

12-30-2007 10:50:25




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 Re: TW10 - Dual Power Shift in reply to HeyPigFarmer, 12-30-2007 10:16:54  
Everything I've had with dual power shifted pretty hard. I talked to my dealer about it years ago. He told me 1. unless you like buying DP units, dont shift them in the higher gears at high throttle. 2. purpose of them is to reduce speed slightly and magnify torque when under load in the field. As a secondary consideration, I did like having them as a 3rd gear low range for running a round baler. Just seemed to be the perfect speed.

As I understand the way a DP unit works there isnt the brake and feathering used in most powershifts. Oil is applied to one side of the piston for low range and the other side for high range so it is a positive mechanical shift when it happens.

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