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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Starter rotation and Compression JD 350

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Wingnut

04-07-2004 17:57:43




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Rebuilt reversor,Replaced Starter soienoid....Ran loader for two days...Heard knocking from rear of engine and front of reversor when running...Still have oil pressure...Pulled engine ...Isolator Plate loose...No rub marks in housing where torsional isolator may have been knocking up against...Wanted to turn engine over to make sure knocking wasnt coming from engine..Now with new battery..(950 Cold Crank Amps) Engine hangin from hoist,Fuel line disconnected ,injectors still installed...Should starter and battery be able to turn engine over or is lack of combustion keep engine from turning over ...I also checked the mains and rod bearings all look new..These were replaced three years ago with loader not being used much at all...Also Engine can be turned over from front of crank with rachet by hand...Im stumped..Any suggestions...

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Wingnut

04-07-2004 20:21:25




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 Re: Starter rotation and Compression JD 350 in reply to Wingnut, 04-07-2004 17:57:43  
I might add that engine does turn over but very slowly til the solenoid cant take it any more then stops...Its like theres not enough power from battery or starter

Wing



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jdemaris

04-07-2004 19:54:51




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 Re: Starter rotation and Compression JD 350 in reply to Wingnut, 04-07-2004 17:57:43  
I don't understand what you mean about the starter. If it's bolted in, and hooked to the battery, it doesn't care if the engine is in or out and it doesn't matter if the engine is firing or not. Obviously, you have to ground the engine or the starter unless you've got some really big jumper cables.



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Wingnut

04-07-2004 20:15:02




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 Re: Re: Starter rotation and Compression JD 350 in reply to jdemaris, 04-07-2004 19:54:51  
JDE...What i was doing was jumping the starter with battery cables directly from the battery ,with the battery completely out of the dozer....Ground directly to starter housing, postive to terminal on starter...temperarely shorting with screw driver to s terminal



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jdemaris

04-08-2004 05:19:52




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 Re: Re: Re: Starter rotation and Compression JD 35 in reply to Wingnut, 04-07-2004 20:15:02  
The jumper cables are probably not capable of carrying enough current. The cables in your crawler are probably 0 or 00 gauge. Your jumper cables are probably #4 if goods ones, and #6 or #8 if "el cheapos." They're all gonna' be a lot smaller than the cables on the crawler. I see a lot of cables for sale that look big because they've got lots of rubber on them - but rubber doesn't conduct electricity well. When I'm using jumpers on a diesel, I usually use two sets of jumpers with two batteries. Put Vise-grips on the starter-post so you can hook two jumpers to it. Keep in mind, that in good cables, the wire will be at least 4 gauge, but 2 is much better, and the connectors - the ones you squeeze open to put on battery posts - will have the conductors wired to both jaws, not just one. Most stores don't stock cables of that quality, you either have to make them or order them.

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Wingnut

04-08-2004 18:10:44




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 Re: Re: Re: Re: Starter rotation and Compression J in reply to jdemaris, 04-08-2004 05:19:52  
JDe...Right on the money again.....Used a better set of jumper cables and worked great.....this forum works for sure and do appreciate the imput...

Wing



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