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Case Tractors Discussion Forum

Case 990 questions

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White half trac

01-29-2014 17:38:45

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Hello everyone. New to this forum but not to yt. Am working on a 990 1976 449 David Brown tractor for a friend or will be. Going to order a manual I promise but curiosity is killing me as I haven't seen the tractor. I have been looking at pics and it appears there is a subframe under the engine. As I am pulling the engine is it possible to pull the engine and leave the subframe? If it was split briefly to pull the clutch and then reassembled for stability? Is the oil pan covered by this subframe under the engine? Any tricks to pulling the engine aside from engaging pto so coupler doesn't drop.

Any help is appreciated and I promise to use a manual. I am just thinking it through ahead of time. Seems I do a job in my head about 20 times before I start. Thanks in advance for any help. New to David browns.

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01-30-2014 03:53:04

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 Re: Case 990 questions in reply to White half track, 01-29-2014 17:38:45  
For what it is worth, the 990 is the easiest of all the DBs to split and pull. The smaller ones require pulling the transmission cover, The bigger ones require playing in hydraulic oil.

Don't remove the fuel tank or the upper clutch cover(leave it bolted to the back half of the tractor) when you do the split, it saves lots of time, and it is easier to line her back up with it still on.

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joe stewart

01-30-2014 03:08:33

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 Re: Case 990 questions in reply to White half track, 01-29-2014 17:38:45  
Look here for some David Brown manuals that will probably help you. Downloadable, free and no registration required.


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White half track

01-30-2014 17:22:34

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 Re: Case 990 questions in reply to joe stewart, 01-30-2014 03:08:33  
Thanks for all the great responses everyone. That really helps.

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01-29-2014 18:39:18

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 Re: Case 990 questions in reply to White half track, 01-29-2014 17:38:45  
The Subframe is the crankcase. The cylinder block is bolted to the top face, the oil sump onto the lower face. If you are removing the engine (cylinder block) from the frame I would remove the oil pump from below first, one little swing on your hoist and the oil pump will snap off like a carrot if it contacts the frame on the way up, been there done that.
To service the clutch the engine does not have to be lifted out of the frame, the only time I can think of that you will need to lift the engine is to service the crankshaft main bearings.

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White half track

01-29-2014 19:01:48

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 Re: Case 990 questions in reply to richardinnz, 01-29-2014 18:39:18  
Thanks for responding. I am removing the engine block to rebuild repair a spun bearing.

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