1000 Series Select-O-Speed Question

Check Break · Sep 23, 2022

I bought a 4200 row crop with a locked up motor. The previous owner told me he towed it twice before I bought it. My guess is the combined tows are about five miles. I asked him if he disconnected the differential first, but he told me it wasn't necessary. I don't think he knew what I was talking about. I visited it today to take pictures and see he shifted it into 10th gear before towing. I didn't think that possible, but on second thought, why not. You can push a powershift so you ought to be able to pull one. I see the problem as there's no lube oil pressure when towing, or is there. I assume I'm going to hear, you're xxxx-ed now. So, what happens when you tow a SOS with a dead motor with traction lock engaged. Taking the lazy way out instead of reading the manual.

Sean in PA · Sep 24, 2022

The S-O-S transmission has a hydraulic pump in the front of it, and it uses the hydraulics to supply pressure to brake band servos and clutch packs to control which gear it is in. When the engine is not running there is no hydraulic pressure and the transmission is in Park. The gear selector simply controls a hydraulic valve inside the transmission that controls where the hydraulic pressure gets applied based on the position of the gear selector, but when there is no pressure due to the engine not running, then it does nothing and the transmission is still in Park. The rear wheels should not be able to turn when the transmission is in Park, and so either the traction disconnect was disconnected when he towed it, or else he severely damaged something, or else the rear wheels weren't turning and he dragged it instead of towing it.

Check Break · Sep 24, 2022

(quoted from post at 22:02:31 09/23/22) The S-O-S transmission has a hydraulic pump in the front of it, and it uses the hydraulics to supply pressure to brake band servos and clutch packs to control which gear it is in. When the engine is not running there is no hydraulic pressure and the transmission is in Park. The gear selector simply controls a hydraulic valve inside the transmission that controls where the hydraulic pressure gets applied based on the position of the gear selector, but when there is no pressure due to the engine not running, then it does nothing and the transmission is still in Park. The rear wheels should not be able to turn when the transmission is in Park, and so either the traction disconnect was disconnected when he towed it, or else he severely damaged something, or else the rear wheels weren't turning and he dragged it instead of towing it.

Thanks for the info. Gave me incentive to pull out the manual. As you say, she's mechanically locked when there's no oil pressure. Bands 2 and 3 apply. The rear wheels on my 4200 turn freely (and the selector is in 10th, likely where the operator had it when he seized the engine) so either she's disconnected or I have serious damage. Attached is a picture of the center housing. Looks like the traction disconnect is in the up position. If I read the book correctly, she's disconnected. Any chance I got it right.

Sean in PA · Sep 24, 2022

I don't have my manual or my '73 S-O-S 4000 nearby, so I can't check to be certain, but I believe that up is disengaged, and down is engaged. I remember standing on the right foot rest with my right foot and pushing up on the lever with my left toe as I rocked the right rear tire the last time I disengaged it. It took about 10 seconds of rocking the rear tire back and forth by hand until the lever moved up. After towing the tractor, dropping the lever to re-engage was easier and quicker.

Ultradog MN · Sep 24, 2022

(quoted from post at 23:36:15 09/23/22)

(quoted from post at 22:02:31 09/23/22) The S-O-S transmission has a hydraulic pump in the front of it, and it uses the hydraulics to supply pressure to brake band servos and clutch packs to control which gear it is in. When the engine is not running there is no hydraulic pressure and the transmission is in Park. The gear selector simply controls a hydraulic valve inside the transmission that controls where the hydraulic pressure gets applied based on the position of the gear selector, but when there is no pressure due to the engine not running, then it does nothing and the transmission is still in Park. The rear wheels should not be able to turn when the transmission is in Park, and so either the traction disconnect was disconnected when he towed it, or else he severely damaged something, or else the rear wheels weren't turning and he dragged it instead of towing it.

Click to expand...

Thanks for the info. Gave me incentive to pull out the manual. As you say, she's mechanically locked when there's no oil pressure. Bands 2 and 3 apply. The rear wheels on my 4200 turn freely (and the selector is in 10th, likely where the operator had it when he seized the engine) so either she's disconnected or I have serious damage. Attached is a picture of the center housing. Looks like the traction disconnect is in the up position. If I read the book correctly, she's disconnected. Any chance I got it right.

Looks to me like someone at least knew a little about it.
Yes, I would say it is in the up/disconnect position.
Original owners manual confirms up is correct to tow.
Btw, looking at your photo reminded me of all the extra stuff there is on a RC under there. And having an SOS adds more to it.
In front/under your fuel tank in addition to the steering stuff you see you have an oil cooler line for the trans and also the pair of cross over lines for your side mounted hydraulic pump. Try removing the pump sometime. That will have you pulling hair and gnashing teeth. Here is a photo of mine after I switched to an 8 speed and and got rid of some of the rat's nest of lines under there.
See if I can add photos in this goofy modern view.

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Bern · Sep 24, 2022

The only way the tractor could have been towed with the wheels rolling and the traction disconnect still engaged would have been to back off bands #2 and 3. If this is truly what happened, and it was towed for 5 miles, I'd be very concerned about internal damage inside the transmission, because indeed there would have been no lube pressure. With half of the components inside still rotating, it might look ugly in there.

Check Break · Sep 24, 2022

(quoted from post at 03:53:50 09/24/22)
Looks to me like someone at least knew a little about it.
Yes, I would say it is in the up/disconnect position.
Original owners manual confirms up is correct to tow.
Btw, looking at your photo reminded me of all the extra stuff there is on a RC under there. And having an SOS adds more to it.
In front/under your fuel tank in addition to the steering stuff you see you have an oil cooler line for the trans and also the pair of cross over lines for your side mounted hydraulic pump. Try removing the pump sometime. That will have you pulling hair and gnashing teeth. Here is a photo of mine after I switched to an 8 speed and and got rid of some of the rat's nest of lines under there.

I was noticing some of that yesterday. Fortunately not as bad as Caterpillar. Thanks to all who responded. Have a crew coming that need direction so won't get back to this until tonight.

Check Break · Sep 24, 2022

(quoted from post at 06:06:25 09/24/22) The only way the tractor could have been towed with the wheels rolling and the traction disconnect still engaged would have been to back off bands #2 and 3. If this is truly what happened, and it was towed for 5 miles, I'd be very concerned about internal damage inside the transmission, because indeed there would have been no lube pressure. With half of the components inside still rotating, it might look ugly in there.

The previous owner did all the mechanical for he and his dad's business. I think he knew what to do or figured it out when the engine locked up and doesn't remember.

I haven't seen one of these in 30 years. Going to save it and have it scanned.

1000 Series Select-O-Speed Question

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Sean in PA

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Sean in PA

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Ultradog MN

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Bern

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