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Allis Chalmers Discussion Forum

5040 starter - again

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Author  [Modern View]

02-06-2012 16:27:01

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Took my starter in for a rebuild about 3 years ago and at the time the shop said it was only a bad solenoid. It has now quit again. Cleaned and checked all cables, key switch, starter switch, neutral safety switch, the normal routine. Would make one strong click when I jumped across the large battery post to the starter post on the solenoid. Took starter off(pain) and had it checked out at same local shop. Naturally it ran perfect on the bench tester with no dead spots so brought it home to re-install.
Emery clothed bendix end of starter and where it bolts up to the flywheel housing, re-installed on tractor and again zippo - dead, dead, dead - no chatter - nothing even when I jump at solenoid now. I have 12.78 volts at the solenoid, ignition switch and starter switch. Swapped out battery cables, again. When I turn the lights ON and try starter the lights stay full on and don't dim.
I have continuity at the neutral safety switch but there is no sign of voltage there - is that right? Anything I am overlooking or suggestions?

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02-07-2012 03:47:16

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 Re: 5040 starter - again in reply to prawnfarmer, 02-06-2012 16:27:01  
If there"s continuity, but no voltage at the neutral safety switch, then there"s a problem with that circuitry. One side of the switch has to show voltage when the keyswitch is on & the rotary switch on the dash is turned to start.

One time I had "no starter" on the 5040 but it wasnt the starter itself. The problem was a bit different than you describe.... the neutral safety switch was not making contact. It was easy to find as I just jumped across the terminals with a screwdriver, turned the rotary switch and it started.

The switch is a crimp-sealed unit. I was able to get it apart and found corroded contacts inside. Cleaned the contacts and put it back together"; no problems since. But, it was a bit of a chore to alter the case to get it back together without the crimp.

However, I"d suggest double checking that neutral safety switch by temporarilly bypassing it. If that works, the switch is bad or corroded inside.

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02-07-2012 17:40:36

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 Re: 5040 starter - again in reply to gatz, 02-07-2012 03:47:16  
Gatz: It will be 3 years in June that you helped me get this same starter off this tractor. Time goes by pretty quick and I appreciate your input!
Tonight - after reading your post- went out and tried again to jump across the 2 poles of the neutral switch- but no luck. Took another try to find some sort of voltage there and, for the first time ever, did manage 3.8 on the multi-meter. Should it be 12 volts? Its hard for my old eyes to make out the wire schematics in the Jennsales manual, but, it looks like one of the wires (blue w/blk stripe) from the safety switch goes to the starter switch and the other to maybe the key switch? When I get off work tomorrow evening I'll concentrate on cleaning the posts of all switches again and see what happens. Any other ideas?

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