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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

CAT D3B Slow crank

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Paul Grothouse

12-03-2005 14:33:24




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Ever since I've had my D3B (about 1-1/2 years) it cranks over so slow. I have had the starter rebuilt and replaced the battery (it has the huge one). It just turns so slooooow. When I give it shot of ether from the the factory direct injection it just about stops the starter.

When I use my truck to jump it on top of the battery it makes hardly any change.

It's OK in the warm months, but now that it's getting cold it's a bear to get started with it cranking so slow.

Any suggestions?

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Paul Grothouse

01-10-2006 14:49:48




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 Re: CAT D3B Slow crank in reply to Paul Grothouse, 12-03-2005 14:33:24  
Just a follow up, I replaced both cables with OO gauge and made the ground cable longer and attached it directly to the starter. Turns over perfectly now. Thanks for the input.



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ben brown

12-04-2005 11:25:53




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 Re: CAT D3B Slow crank in reply to Paul Grothouse, 12-03-2005 14:33:24  
one other thing run your ground cable to the starter and ground it to the starter mounting bolt make sure your tractor battery is charged up good



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TomD3B

12-04-2005 05:34:32




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 Re: CAT D3B Slow crank in reply to Paul Grothouse, 12-03-2005 14:33:24  
Paul:

I have the same machine with the same problem. Every time the temp drops into high 20s for any period of time could never start it even with BRAND new batteries. Turned over very sloooowly.

Had the local NAPA dealer make me new 2/0 cables and so far has seemed to fix the issue. Cables are really heavy and stiff but since I have 2 880CCA batteries hooked in series I suspect I needed the extra diameter.

Hope this helps!
Tom

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Bob/Ont

12-03-2005 18:35:23




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 Re: CAT D3B Slow crank in reply to Paul Grothouse, 12-03-2005 14:33:24  
Paul, you could take a volt meter and check the voltage drop in each cable as you crank. Do this after the engine has been running and warm. Hook it up with the Red at the bat pos and the Black at the starter pos. Then crank the starter and read on 2 volt scale. The meter will read the voltage drop or line loss in that cable. Should be no more than 1 volt, idealy 1/2 volt. Do this to the ground side too. Red on the starter Ground and Black on the bat neg. This will tell you if you have a cable problem. If you find a big loss in any cable clean the ends and connections and retry. If no better replace that cable. Since boosting doesn't help much your battery is likely fine but a load test would be good too.
Later Bob

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