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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

JD450C Starting issues

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Mark2 (NY)

08-29-2006 07:27:11




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My JD450C is still suffering starting issues. When the start button is pushed I can hear the solenoid make noise but the engine does not turn over. This is the same symptom that caused me to replace the starter several months ago, after which, things worked fine for the next three months or so of very intermittent use. The symptom then returned and I again replaced the starter along with the batteries one of the grounding straps. Things then worked fine for another three months of intermittent use... until now.

In one case I was able to get it started after charging the batteries and messing with every battery connection and all the connections on the starter.

In another case, doing all that made no difference, but after tapping on the starter a few times, it started right up.

I've read that every 1000 hours I'm supposed to "lubricate the wicks" on the starter. I assumed that isn't something I need to do on a new starter?

Is there something I'm doing (or not doing) that could be causing the starters to fail? Other things I should be checking? These are remanufactured starters from the JD dealer.

Thanks!

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jdemaris

08-29-2006 19:28:21




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 Re: JD450C Starting issues in reply to Mark2 (NY), 08-29-2006 07:27:11  
You don't need to worry about lubricating your wicks. Also, I assume the clicking you hear is the solenoid contacts clicking, and not eslewhere? I also assume that if you take 12 volts positve and jump it directly to the S terminal on the solenoid - it still just clicks? You DO need to ascertain if your problem is lack of battery current getting TO the starter, or a malfunction within the starter itself. You could isolate the problem instantly with a carbon-pile type load tester. Just attach the load-tester to the big post on the starter-solenoid (where the POS battery lead hooks) and verify there is adequate amperage available at proper voltage at that point. If it reads anything over 400 amps at 9 volts, then the batteries and connections are fine. If you don't have access to a load tester, next best thing is . . . put a voltmeter on the same post - it should read full battery voltage (approx. 12.5) when sitting idle. Then try to crank over the engine. When it "clicks", check the voltage - it should drop to somewhere around 9 volts. If it drops below that - you are not getting enough power TO the starter. If it does not drop, or only slightly, the problem is within the starter/solenoid. By the way, the 450C is supposed to have a 900 amp starter, whereas older 450s have 700 amp starters. It doesn't really matter except in very cold areas. But, the 900 amp housing is one size the entire length, and the 700 amp steps down and has two diameters.

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