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Re: David Brown 990

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Author  [Modern View]

09-05-2013 03:48:43

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You could by-pass the lift pump by installing an electric fuel pump. can you tell if the front seal is leaking? What is wrong with the injection pump you had "fixed" that it is not working? Injection Service gets spendy fast

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UP Oliver

09-05-2013 06:05:59

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 Re: David Brown 990 in reply to dzc3, 09-05-2013 03:48:43  
I had this same kind of problem with my Oliver 1755, and I took the injection pump gear off and eventually discovered the leak on the outside of the pump shaft tube. (I can't remember the official name of that tube)

I thought about doing this with the 990, hopefully if there is a leak in the front I will see it.

I sent the pump in when I rebuilt the tractor to get looked at since the tractor had not been running for a couple years. They rebuilt the pump for about $550. I had fuel getting in the oil and someone suggested it had to be the lift pump. I got a new one and that did not stop the fuel getting in the oil. So I was told to send my pump back in and have them replace the front seals. The guy told me they can last for 2 day or 10 years or whatever. So there is a chance that they are shot again. It seemed like the oil level went up pretty quickly after I had those seals replaced on the pump.

Anyway, I'm going to look more at the lift pump and if that seems OK I'm going to take the gear off the injection pump and see if any fuel is leaking out the front.

It has to be one or the other. And to leak 3 quarts in 25 or 30 hours of tractor use to me is a bad leak.


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09-06-2013 13:26:13

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 Re: David Brown 990 in reply to UP Oliver, 09-05-2013 06:05:59  
Is it a CAV DPA or a CAV DPS pump ?. Remember trouble with DPS shaft seals on new pumps , Installing new seals overcome problem. The DPA pumps are very reliable and not known for this problem although it can happen. They can operate without lift pump, this is fitted to pump air out in case you run your tank empty. Another thing to check is the fuel pressure in the pump housing.

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UP Oliver

09-08-2013 11:11:11

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 Re: David Brown 990 in reply to J.WJansen, 09-06-2013 13:26:13  
Thanks for the response. I have a DPA pump. It has been rebuilt and sent in again later. I hope I don't have to send it in again. If I do, it is not going to the same place it went for the rebuild and the front seal replacement.


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