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David Brown 1200 running out of power

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Bullfiddler

10-20-2007 16:05:21




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Have a DB 1200 that when running for a period of time, it is running out of top power. I just replaced a leaky injector line on #3 cyl thinking it would solve the problem, but after using it for 2 hours mowing, it slowly would start losing power and I could barely keep rpms up high enough to run the pto when I was finishing up. I'm trying to figure out if it is a fuel problem or worse like I'm losing compression or something.

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Patrick Tercho

10-20-2007 18:04:10




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 Re: David Brown 1200 running out of power in reply to Bullfiddler, 10-20-2007 16:05:21  
First thing that comes to mind is fuel filters, Bullfiddler if you haven't changed them in a while, might be worth it. Also check the transfer pump to see if it's pumping ok, might have a ruptured diaphram. You should be able to determine if it's working while you are bleeding out the new filters. Is the fuel fresh? Fuel that's set for months and has water in it gets an algae growing in it that plugs up filters, tank strainers, etc. This sounds like a fuel delivery problem, but also be worthwhile to check the air cleaner too. Good luck!

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Bullfiddler

10-21-2007 06:28:26




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 Re: David Brown 1200 running out of power in reply to Patrick Tercho, 10-20-2007 18:04:10  
Thanks, I'm going to check the transfer pump and change filters. What boggles me though is that it will run good for a while and then slowly start to run sluggish ie: crack the throttle open and it is slow to respond.



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Old Ford Mechanic

10-21-2007 14:04:55




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 Re: David Brown 1200 running out of power in reply to Bullfiddler, 10-21-2007 06:28:26  
Also check your fuel shutoff at the tank.It may have a strainer on top inside the tank.A prime spot to be clogged.Also if you have any small fuel leakages around any of the fuel lines check those very throughly.Run your fingers along the lines.Look for worn spots on the backsides where they might be rubbing against something.Makes them suck air which will cause the problems your speaking of.Also need to utilize your watertrap pitcock every day.This is especially true if the tractor is not used alot.

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richardinnz

10-21-2007 13:59:45




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 Re: David Brown 1200 running out of power in reply to Bullfiddler, 10-21-2007 06:28:26  
Check out your fuel system like Patrick says, but, David Browns have a push rod to operate the lift pump, these do wear and limit the stroke of the pump and cause fuel starvation symptoms.



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