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Case Tractors Discussion Forum

Case 900 Pump Question

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02-23-2021 12:04:31

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Picked up a 1959 Case 900 Diesel with the later In-Line Pump. The tractor sat for several years. The guy I bought it from had someone with Diesel knowledge come out and get the tractor started. The guy told me it ran for just a few short minutes and he raised the loader (yes it has a loader if you can believe it) which promptly blew a hose so he shut the tractor off.

I got it home and gave it a pull and it did start right off. It is missing on I would say 2 cylinders. The other issue is it runs at full throttle and the throttle lever moves the lever on the pump, but makes no difference in the rpm's of the motor. The tractor engine is not trying to run away, just runs at full throttle.

Is there some way to look into this without taking off the pump? Any other suggestions? Thanks - Bob

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02-23-2021 20:31:48

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 Re: Case 900 Pump Question in reply to Bobl1958, 02-23-2021 12:04:31  
I had the same problem, soaked the racks by putting carb cleaner in one end and let it come out the front. Did it for three months, and each time I squirted new in dirty would come out the other. Never freed it. Had to take pump off, remove plate on inside wall, and again used carb cleaner which then got the plungers working. On reinstalling, note timing marks, and a service manual will tell you to install one tooth off so gear will line up with mark as it turns to seat. Not all really that hard, just a wrenching pain.

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02-23-2021 12:15:13

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 Re: Case 900 Pump Question in reply to Bobl1958, 02-23-2021 12:04:31  
The missing on two cylinders probably have those two pump plungers stuck, causing the rack to stick also. With pump side cover off you MIGHT be able to tap the stuck plungers down, those will be the ones stuck up when the cam tappet is down against the cam. I'd loosen all injector lines so engine won't start, then see if you can free the stuck parts up. Remove the front rack cap, when the rack will move easily BY HAND engine will be safe to start. DO NOT BEAT ON THE RACK!! That can break the plunger gear segment teeth.

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02-23-2021 17:38:40

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 Re: Case 900 Pump Question in reply to Dieseltech, 02-23-2021 12:15:13  
Many thanks for the reply. I don't think there is any plate on the side of this pump, not the outside anyway. Couple on the end next to the starter.

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02-23-2021 18:26:05

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 Re: Case 900 Pump Question in reply to Bobl1958, 02-23-2021 17:38:40  
Pump side cover is on inside next to block on 30 series.

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02-25-2021 11:05:22

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 Re: Case 900 Pump Question in reply to Dieseltech, 02-23-2021 18:26:05  
Thanks again. I plan to get the loader off and get it washed up this weekend. I'll see what it looks like then. Thanks - Bob

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