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990 frustrations and more

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Jeff Mc

03-24-2007 21:19:43

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Well you get what you put into it I guess. My clutch was shot last year and I finally got it into a shop in early January - trouble is the tractor is still there and is still not fixed. I'm hoping that I can get some guidance from some of the folks on this board to help when I go into the shop on Monday. Here is the info I have, the clutch was completely replaced, it was metal on metal and they had to machine one of the plates. After they put it back together the transmission won't slow down enough for to switch gears. Apparently there is a brake band that fits over the input shaft to the transmission that has worn out and the part can't be found. We've also discovered the steering housing is cracked and that needs to be replaced. Its my understanding that the clutch on DB 990's can be tricky. Here are the questions:
1) Where do I find a brake band? Is there another fix to this?
2) How long should a job like this take?
3) what should be done about the steering, do I need to buy the entire assembly?

All your help is GREATLY appriciated - I nee to get that tractor out fast, I'm going nuts!

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3-71 Fan

03-25-2007 09:51:39

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Re: 990 frustrations and more in reply to Jeff Mc, 03-24-2007 21:19:43

I totally misunderstood. I thought he was asking about an Oliver 990. I assumed the DB was a typo for DD (Detroit Diesel) I guess I sort have a one track mind and it's on Oliver. Sorry for any confusion.

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TomTX

03-25-2007 02:07:21

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Re: 990 frustrations and more in reply to Jeff Mc, 03-24-2007 21:19:43

Jeff, what we have here is a failure to commicate.

1. Answers below are related to Oliver tractor, and I think you have a David Brown
2. David Brown was bought out by Case
3. Go to Case board, there are David Brown experts there.
Good luck, Tom

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U.R. OFFAROW

03-25-2007 00:21:24

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Re: 990 frustrations and more in reply to Jeff Mc, 03-24-2007 21:19:43

Boys, I gets da feelin' dat you is not on da same page here.

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rrlund

03-25-2007 08:39:38

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Re: 990 frustrations and more in reply to U.R. OFFAROW, 03-25-2007 00:21:24

Slow down there Pecos,Oliver sold the 990 DB as an Oliver 600 before they were introduced to the US as a David Brown. The 850 DB was sold as an Oliver 500. That's why the reference to the Oliver forum.They started selling them here as a DB in 1963,so Oliver went to Fiat for their utility tractors.

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MR. POTATO HEAD

03-25-2007 09:05:59

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Re: 990 frustrations and more in reply to rrlund, 03-25-2007 08:39:38

I think it's fairly obvious from the conversation of these 2 individuals that they are talking about 2 totally different tractors.

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3-71 Fan

03-24-2007 22:50:52

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Re: 990 frustrations and more in reply to Jeff Mc, 03-24-2007 21:19:43

Well please don't go nuts. It can't be that bad.

The clutch on the 990 is one of the easiest ones there is. It's has the huge advantage that you don't have to break the tractor in half. Assuming all the bolts are free a good mechanic could have the clutch out in about 2 hours. There is no brake band over the input shaft. There are a number of things that could cause the clutch to fail to disengage. The clutch is kind of unique because it's inside the flywheel. Maybe that's what someone thought was tricky but it's not. If you don't have enough clearance between the clutch and sides of the flywheel or if the pilot bushing is to tight the clutch will not disengage properly. To diagnose the problem disconnect the shaft from the transmission and turn the shaft it by hand. It should turn easily with the clutch engaged but I bet yours doesn't. Try and determine were the drag is.

How long it should take is hard to say. There are so many variables. It would take me about 5 or 6 hours to remove and replace a clutch if I had everything I needed and I did not have any problems. But if something is stuck it could slow you down. That 5 or 6 hour estimate does not include any time machining. The flywheel cost a little more than most to machine because it has three surfaces to machine. Most only have one.

It's going to be very hard to find a steering assembly. Is it the steering gear box or the bracket that holds the steering gear box? Your best bet is to try to have it welded.

Hopefully I've answered your questions but if you more post on the Oliver board before you go nuts.

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jeffmc

03-24-2007 23:14:24

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Re: 990 frustrations and more in reply to 3-71 Fan, 03-24-2007 22:50:52

Thanks for the reply. I guess thats good and ba news. To talk to the mechanics at the shop its a huge mystery that the clutch didn't work when they put it in. Thats what prompted them to open up the transmission - When I go in Monday to discuss it, I'm sure they'll want me to pay for the additional hours they put in finding this brake band and opening the tranny. Thats bad news on the steering gear box, I'll see the item in question monday, but I was told its the box. It was cracked and full of water - everything in there was shot.

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3-71 Fan

03-25-2007 00:00:47

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Re: 990 frustrations and more in reply to jeffmc, 03-24-2007 23:14:24

I can't believe they opened the transmission but don't worry to much if you have to pay for the labor. It's pretty easy to pop the trans cover off. Especially if they already had the fuel tank off. Should not have taken them very long. I could email you a scan of the clutch from the service manual but it's not going to help them diagnose your clutch problem now. They've done something wrong. Did they replace the pilot bushing? It hard to explan but the clutch sits inside the flywheel. The outside edge of the clutch is probably draging against the inside of the flywheel. You might need a new mechanic.

Well if you need help with the steering gear box I'm sure I can help you with that too. I know them very well. It may not be as bad is it seems. If you have any more questions I suggest you post them on the Oliver board. Where are you located?

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