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Oliver OC3 starter

M

myonlyfarmall

New User
Hello, my starter is not working at all. The starter did get hot and the engine did not turn over. When we take the starter out of the crawler and hook a battery up to it, it spins. The pinion gear though is always in the same spot , (closest to the starter housing) it doesn't move back and forth on the shaft unless you manually move it with your fingers. So it does slide, just by hand.
What makes it return to the other side of the shaft, closest to the spring end on the starter??? There is about a half inch of cap between the pinion gear and the spring now, when its in the start position. Looks to me that its always in the start position...unless moved by hand.
The teeth on the flywheel looks good
My engine does turn over easy by hand, so the engine is not seized.
My father took the starter to a repair shop and said its ok! He may take it back to the repair shop again today but we are just confused on how this starter is suppose to work, it doesn't have the solenoid like a car starter....
Thanks
 
Hello again, also trying to figure out the year of this crawler. The ID tag says model number HG OC3-42 serial number looks like 9WH488
The ID tag does say Oliver on it. thanks again!!
 
WH prefix letters are used on OC-3 tractors, GA prefix letters are used on the HG crawlers. Your tractor is a later 1952 model. There were 2 different starters used. Which one do you have? How fast does the starter spin when it is on the bench? Those starter drives are also known to get sticky and will not move freely.
 
Thanks for replying!
There is no tag on the starter. The starter spins over fast when you apply 12 volts to the I believe 6 volt starter, that is on the bench.
My farmall H is setup that way to. It turns over nice and starts right away so the starter doesn't get hot at all. 6 volt starter,12 volt battery.
On the Oliver, when the starter is installed in the tractor, the engine didn't turn over and the starter wires got hot so we disconnected the 12 volt battery. The starter has 3 mounting holes and one stud for power.
The starter was hard to remove from the crawler as I believe the pinion gear was lined up( Meshing with ) with the ring gear on the flywheel. I believe the pinion gear should have been pushed back ,normally in the non start position and the starter would have come right out. I can push the pinion gear back and forth on the starter shaft ok. Just not sure how this starter theory should work.....with no solenoid like a modern car has.
Thanks
 
Inertia, or bendix type as they are known, rely on a quick start to throw the pinion into the starter ring gear. They are normally thrown out of mesh as the engine fires or the return
spring acts to do the same, otherwise.

While cranking speed is improved, with 12V onto a 6V starter, they will overheat if used for too long at a time. The bendix also gets hammered by the faster start, throwing it out
much more energetically. Some last OK and some fail prematurely. I would think a new bendix is likely the cure.

If the pinion is in mesh the starter is likely to remain in stall condition and draw excess current (as a resistive load) when the solenoid or switch is operated. Usually only a couple
areas on the ring get worn/damaged, as the engine will usually stop in one of two places (as the next cylinder coming onto compression arrests the crankshaft). Rough teeth can
cause the pinion to remain in mesh, particularly if the return spring is past its best.
 
Hello, it would be the inerta type starter. That would make sense to me how it works! I am getting ready to work on her now. Does the spring on the end of shaft absorb the shock from the pinion gear getting thrown back after engines starts?? Funny thing is tractor engine turns by hand starter works on test bench but when starter is installed in tractor, it doesn't rotate engine and starter wire got hot. Going to work on again now and see what happens!! Thanks
 
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