Komatsu Excavator serial # A80017

old · Oct 20, 2015

So with this serial number does that help you guys help me?? Plan is to go and look at it again tomorrow and try switching the battery cable and starter cable on the solenoid and see if that helps or not. Also plan to check with it running what voltage is on the battery so I know if the alternator is charging or not.
Thanks

Den N Ms · Oct 20, 2015

Does it have a parallel switch on it that starts with 24 volts then goes back to 12 volts?

old · Oct 20, 2015

Not that I have found. The way the battery hooks up there is no way it could be 24 volts start and 12 volt charge.. True series hook up in the batteries

Den N Ms · Oct 20, 2015

Look close,that may be why the alternator maybe disconnects when the start switch is is in the start position.

RBoots · Oct 20, 2015

I worked at a Komatsu dealer for almost 10 years and EVERY one I ever saw/worked on was 24 volts. Matter of fact, ALMOST ALL construction equipment larger than a backhoe is 24 V.

Ross

CBBC · Oct 20, 2015

So this may not help but...I have a PC 60 -5 I believe. We had all kinds of trouble with it not starting, clicking. And then all of a sudden it would work fine.

I changed the starter switch (key). The starter and solinoid was taken off and checked in an excellent shop. I would trace the power. But it would work most of the time and then when it stopped I would come back later with the meter it would run. Very frustrating.

Eventually I was going through the parts book and came across a wiring harnesses connector which lead to one of the solonoids or relays. When I unplugged it it was dirty and wet. I was going to replace it but first I took my wife's hair dryer and let it run blowing warm air over the open harness.

I haven't had a problem since. When I put it back together it was covered in dielectric grease. What I remember is that it was a pain to get at. It was behind the fire wall on the front of the engine compartment and the fuel tank. There was an acces panel which came off and I was able to twist in and get my arm in to unhook the connector.

Good luck. There may be more room on the bigger machine.

old · Oct 20, 2015

both batteries are hooked up + to - and the + of the cable goes to the starter and the - to ground and there are no other wires or cables so it has to be a 24 volt alternator

Den N Ms · Oct 20, 2015

Looks like a 24 volt system to me

old · Oct 20, 2015

That picture is not even close to what this one looks like. 2 batteries side by side and one simple cable between the 2 of then hooked + to - and then the normal battery cables on the other 2 posts not extra wires or any thing else

Den N Ms · Oct 20, 2015

Old you better have your eyes checked because that is SN A80017

old · Oct 20, 2015

I did not get that number the guy who owns it gave it to me so can not say much more since I can only go by what he told me. But I can say there is not all that clutter in the battery box of the machine he has just a simple cable between the 2 batteries and then one on each of the other posts.

NCWayne · Oct 20, 2015

Bad as I hate to say it, you can't take anything for granted anymore. I was working on a JD wheel loader the other day, and needed a jump. There was a newer D6 sitting close that I figured would work just fine for my needs, until I popped the side cover where the battery compartment was. The thing had one, truck sized, 12V battery. Yep, construction equipment has been 24 volts for a lot of years, but with the new electronics, they have begun using 12V, I assume, to make it easier for them to incorporate all of the junk electronics.

Another good one for you. I pulled the starter off of one of a JD compact track loader the other day. The thing has a 4 cylinder, diesel engine, but the starter looked like it should have come off of a B/S gas engine. I guess that's why it fried as quickly as it did.

Den N Ms · Oct 20, 2015

Why would he give you that SN # A80017 if that is not his machine? Take a pic of it tomorrow and post it.

old · Oct 20, 2015

Well like with any body going by memory they can be wrong and get hings out of place or leave a number etc out. Can you rattle off serial number or your machines off the top of your head?? Yes I do plan to look for my self tomorrow if I get there. As for pictures not likely since I will be there to do a job but will make sure I look at the numbers my self to make sure what he told me is what they really are. But as I said no where near all that stuff on top of the batteries of his machine I know I took off all of them and cleaned them all to make sure a bad connection was not the problem

RBoots · Oct 20, 2015

Wayne,
When I left that line of work a few years back, things were changing so fast,it was hard to keep up with that stuff then. The dash 8 Komatsu excavators were fresh off the line, almost everyone had some version of tier 4 engines. The dealer I worked for was a Komatsu, JD, JCB, and Wirtgen dealer, and would take any brand trade ins. Glad I got out of that field when I did, I don't work on that stuff anymore unless for a real good friend or our own stuff. I would rather work on small ag equipment when I want to. I just wish I had quit BEFORE I had torn up my shoulders. I tip my hat to you, that is a very taxing occupation.

Ross

Handyman · Oct 20, 2015

(quoted from post at 18:28:17 10/20/15) That picture is not even close to what this one looks like. 2 batteries side by side and one simple cable between the 2 of then hooked + to - and then the normal battery cables on the other 2 posts not extra wires or any thing else

he way you describe the battery connections it is wired for 24 volts, to get 12 volts you would need to connect the battery posts + to + and - to -.

old · Oct 20, 2015

That is why I got out of electronics way back say 25 years ago. Things where changing so fast a person could not keep up with it. Sure wish I still remembered what E=MC squared was or how to count binary and octal

Komatsu Excavator serial # A80017

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