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John Deere Tractors Discussion Board

Re: JD1020 Starting Issue

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Posted by LJD on September 29, 2012 at 17:17:09 from (

In Reply to: JD1020 Starting Issue posted by acadianbob on September 29, 2012 at 11:34:28:

The easiest way to diagnose is with a 500 amp rated carbon-pile load-tester. You start by sticking it on the big post on your starter solenoid and other end to starter-ground and dial up the load while watching voltage. If you can get 300-400 amps and still maintain 9 volts - you know the power to the starter is good. If the power IS good, it easier to just yank the starter off and pull it apart for inspection. It's only a 15 minute job and 99% of the time - any problems with be clearly visible. Bad brushes and/or brush holders, solenoid problems, etc.

On a side-note . . . the solenoid on your Deere is the same as used on Chevy/GM cars and trucks from the 50s to the 90s. Complete new solenoid can be had for $18. That being said, it also repairable and has contact disks inside that can be flipped over for a new contact surface.

My starter went on my 300B last month (it's basically a yellow 1020). I yanked off the starter and the brushes and brush holders were fried. I decided while off I ought to go all through the starter. Well -after pricing a new starter drive, bushings, brushes, brush holders, and a solenoid - parts came to $85 (including shipping charges) and it was going to take a week to get the parts. That because we no longer have any local starter repair shops that stock parts. So, for $90, I bought a brand new, better-technology gear-reduction starter instead. It was here in 2 days. Kind of sad when it's cheaper to buy new then fix the old - but that's the way it is thanks to the 3RD world making stuff.

I assume you don't have a load-tester. Take a VOM or voltmeter. Hook to the big post on the solenoid and ground on the starter. Try to crank and see what voltage is. If it drops to below 9 volts -you've got power problems going up the the starter. If it stays at 11-12 volts - you've got a internal problems in the starter or solenoid OR the solenoid is not getting power to the little "S" terminal with the 10/24 stud and 11/32" hex nut.

If the tractor cranks - but cranks slowly and voltage hovers round 8.5 to 9 volts in warm weather - you might also have a hydraulic pump issue. Deere tractors are prone to the hydraulics making the engines crank hard. Especially when hot.

The brand new starters can be found for $79-$100, but you've got to shop around.

This one is for the 152 diesel used in the 1020 tractor, 350 crawler, 300 tractor, etc.



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