Case930 diesel starter stopped working

Milk · Mar 16, 2022

Hi guys,
I have an older case930 diesel tractor that had the starter suddenly quit working for me. It has been working good with no starting problems when suddenly when starting it again between loads of corn, it partially turned over the engine then suddenly quit. I pulled starter off, put the charger onto boost, connected the ground and positive to the switch on solinoid,snaps drive gear in but doesnt look like its turning the gear fast enough and with enough force to turn the engine over. MY question is, when engaging the starter is the driver gear supposed to snap in and turn at a fast speed? Thank you for your responses!

SVcummins · Mar 16, 2022

Sounds like the starter gave up the ghost

dpendzic · Mar 16, 2022

I don't know if a charger on boost would give enough amperage to get the starter to snap and spin fast--a jumper to a good battery would tell better

Milk · Mar 16, 2022

Thats what Im thinking also!not many people work on starters anymore.

rustred · Mar 16, 2022

probably the brushes are worn out. time for a brushes and bushings. cause if your bench testing it in a vise it will spin like crazy. and on
the floor the starter will jump and tip right over.

Milk · Mar 16, 2022

Thanks for reply! It doesnt jump when engaged, just spins slo! I am going to have it checked out tomorrow, just got my curiosity going!

Steve@Advance · Mar 16, 2022

Using a charger to test a starter is not a real good test. It may not have
enough amperage to power the starter. Even successfully spinning a starter
with a battery tells little about its ability to crank an engine under load.

The best test is with it still on the engine and connected to the battery.

Typically, with that type starter, bad brushes will cause the starter to fall
silent, no drive pull in, no spin, just nothing.

A hard solenoid pull in with no starter spin is the internal solenoid contacts
that send power to the starter.

And there are other possible problems, there may very well be an internal
problem with the motor it's self.

What you are describing sounds like possibly a bad battery connection, be it
at the battery, or one of the cables, the ground. Testing under load, on the
tractor, with a test light or volt meter, is the first step.

caterpillar guy · Mar 17, 2022

I'd start with cleaning all connections then try. If not any better and it only snaps the gear out by sound on tractor then I would look at the contacts behind the solenoid cap. I am betting they are burned if so change solenoid. If not then it is probably brushes and bushings time. While in there polish the commutator too. That is the surface the brushes run on.

Milk · Mar 17, 2022

Checked all the connections, battery is fully charged, good contact from battery, just nothing up to the switch or lights on the dash, Wierd!! I am taking it today to get checked . Thanks though!!

Milk · Mar 17, 2022

Ok, I will try your suggestions! Theres no juice coming up to the switch or lights on the dash. Ive got juice coming from battery to the starter with continuity probe light , not enough power to turn engine even one revolution! Just trying to figure this thing out! Thanks though!

teddy52food · Mar 17, 2022

If it lost the lights too, you have a bad connection some place.

used red MN · Mar 17, 2022

If you have power at the starter and none at at the ignition switch you need to determine why. There should be a heavier gauge wire 10 ga or so connected to the terminal the battery connects to on the starter that runs up behind the dash to feed power up there. It may junction at the voltage regulator. You have to figure out why the power is not getting up to the ignition switch.

Milk · Mar 17, 2022

Okay, thanks ! I am going to check out this afternoon.

Milk · Mar 17, 2022

Thanks, I didnt think about checking to see if the lights still work!

Milk · Mar 17, 2022

Found the problem guys, I had starter checked, checked out find, put it back on and same thing! No connection. Tried another cable to positive post still nothing!!Checked the ground cable and found that it was a little loose, just enough that it wasnt visible or making a good contact! Thanks for all your suggestions, I read them all and used most of them.

Case930 diesel starter stopped working

Milk

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SVcummins

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dpendzic

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Milk

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rustred

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Milk

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Steve@Advance

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caterpillar guy

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Milk

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Milk

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teddy52food

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used red MN

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Milk

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Milk

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