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Starter problems.

D

dmiller

Member
Specifically this is on a JD620, but it shouldn't matter, it is a generic starter issue.

The starter spins but will not turn the flywheel. When looked at while parked the teeth of the starter and flywheel appear to engage normally. When trying to start it though...
The starter sounds like it works fine, but the bendix gear just spins really fast without turning the flywheel. When you let off the starter button, it grabs the flywheel as it slows down, but then doesn't have enough force to turn the flywheel. It doens't seem to matter where on the flywheel you are. I oiled the shaft on the starter to make it easier for the bendix gear to spin.
???
What to do? Need to use this tractor tomorrow.
 
I think it has a one way clutch on the pinion/drive if it slips, it will do so often untill the motor slows down and then it will work and move the engine a little bit. I would replace the drive pinion. Jim
 
Could be a number of problems. Weak battery will do that. Or burrs on the bendex gear making it so the stater drive will not slide into the ring gear teeth. Or a bad ring gear sliding on the flywheel instead of holding tight to the flywheel
 
Janicholson and 504, thanks for giving me a second opinion. That's what I think it is, but wanted a second opinion before I tore the starter off to rebuild it.
Old, I also thought of a weak batter, but know that's not it. Charged it and tried to jump it. spins really fast but to grabbing the flywheel.
Thanks,
 
Also- units with the solenoid mounted on the starter generally have a lever which, using the movement of the plunger in the solenoid, forces the drive gear out into the ring gear. But, whatever it is in there, if you need it that soon, it sounds like you might be looking at trading for a reman. unit.
 
If you can't make the repair you can pull start your tractor if you have another tractor or truck. Check your battery as been mentioned using a hydrometer. Should see about 1.275 on all cells. If the battery is ok you may need a new bendix. I would have it checked at your local repair shop that repairs starters, generators or alternators. Cold temps are hard on batteries. Inspect your battery cables for any fraying or cracks. Buy new cables if needed. Hal
 
anyway to trick it a few times??
Need to use it the next few days and will not be able to get the part in till next week.
 
Take the drive off the starter shaft, clean inside bore of the drive & the shaft thoroughly. DO NOT OIL!!!!!
It should be squeaky clean & dry. Clean enough to do open heart or brain surgery in there.
Willie
 
There are two main types of starter drives; Bendix(large spring visible on outside) and overrunning clutch which uses a lever activated by magnetism (solenoid mounted on starter).
IF the starter spins and IF the starter pinion teeth ARE engaged with ring gear teeth either the Bendix spring is broken or the overrunning clutch drive is worn internally. It has several little rollers that lock the drive to the starter shaft when cranking and overrun when the engine fires up until the solenoid releases the lever allowing the pinion teeth to dis-engage from the ring gear.
SO: which type starter drive so you have?? The older style (Bendix or sometimes called inertia drive) OR overrunning style (no visible big outer spring)??
When that issue is clarified then you can get more accurate information from the folks here.
Pictures help if you are in doubt.
Happy New Year.
 
I think this is the one with the overrunning clutch. I has what looks like an enclosed bearing behind the bendix. Different than the one on my old JD A (rebuilt that one a few times over the years).
Watched it closely as it was trying to crank. Bendix comes out, engages the flywheel, then the starter moter spins but the bendix quits.
Tried to drop it this afternoon and the battery cable bolt is spinning on the inside. Going to have a fight getting a wrench into the back side of that little bolt.
Will see what it looks like on the bench tomorrow.
 
Not that is safe for the starter motor. Kocking it would do, but the motor could easily get spun to 10,000 rpm and explode. Pull start the tractor! Jim
 
(quoted from post at 22:39:02 01/01/15) Not that is safe for the starter motor. Kocking it would do, but the motor could easily get spun to 10,000 rpm and explode. Pull start the tractor! Jim
Click to expand...

Pretty much had that happen on our 3010D. The drive clutch must have locked up. When the engine was started my dad could not hear that the starter was still engaged. The armature windings were thrown out of the separator plates and destroyed the field coils before locking up. Once the armature locked the drive broke loose again so it didn't kill the engine. Sure did destroy the starter though.
 
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