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Farm Pro 2420 Starter Issues
So reading through these forums I was able to diagnose a fuel issue last week and replaced sediment bowl etc. Tractor started up just fine this morning and have been working it for a couple hours.
Well again the tractor died like it was choking for fuel so I went through and checked for bugs and cleaned out sediment bowl.
Now I try to start and sounds like the starter is just spinning. I'm attaching a video and I'm sorry I'm no mechanic but can I get guidance on what may be happening please.
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Farm Pro 2420 Starter Issues
Alright got the starter off finally, Chinese assemblers dont make it easy.
Looked at the flywheel and doesnt look to bad.
Bench tested starter and gear come on out but don't spin. Hit it with some PB to see if it was gunked up waited a few and tested again same result. I'll attach what photos I can and video
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Farm Pro 2420 Starter Issues
Ok did as you said and tested it, gear spins as it should.
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Farm Pro 2420 Starter Issues
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Farm Pro 2420 Starter Issues
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Farm Pro 2420 Starter Issues
I was hoping the starter was bad to. When I took the starter off I took a pry bar to see if flywheel rotated and it did just fine.
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Farm Pro 2420 Starter Issues
Ok I understand what your saying and it took a little force to rotate the flywheel. It didn't spin like a top toy so to speak. Also when I initially tried to start it seemed the starter didn't even touch the flywheel, there was no movement in the engine but the starter screamed.
Someone else said it could just have been gunk in the starter keeping it from fully engaging. I'm going to go and re install it tomorrow if mother nature let's me and see what happens. Maybe I'll get lucky but will let you know.
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Farm Pro 2420 Starter Issues
Ok so I talked to an old diesel mechanic here that work on tractors for local farmers. He said the gunk is possible, but it is also possible that when the gear locks out the solenoid doesn't push it far enough making the gear spin. But won't know till I reattach. Said if it still is doing same and flywheel turns then it's more in likely the starter have some issue.
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Farm Pro 2420 Starter Issues
Said when bench testing there is no pressure on the starter. So it just may be weak when actually trying to turn over the motor. We will see.
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Farm Pro 2420 Starter Issues
Nowadays the old school starter and alternator shops are out of business. We had a small on her and the old man died. His kids worked there but had to sell out, just couldn't compete with these big auto parts store. Its unfortunate, I miss the days you could just take something and have it rebuilt.
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Farm Pro 2420 Starter Issues
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Farm Pro 2420 Starter Issues
Well here we are working on a Sunday, so I tested the starter correctly and the gears popped out and spun.
After talking to some old farmers and a diesel mechanic that does a lot of tractor work for the farmers out here. He said the starter could have been gunked up and just needed a good blast of PB or the solenoid might not be working and spinning properly when the starter is under strain, like when it engages the flywheel.
Now I checked the teeth on the flywheel and they don’t look bad and I also turned the flywheel. There was good compression and I could feel it turning the pistons. So thankfully its probably not something worse but something wrong in the starter itself.
I am going to go ahead and order a new starter and see what that does, so I can get back to the fuel choking out issue.
I have uploaded some videos and pictures. Hopefully it will help someone else in the future.
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Farm Pro 2420 Starter Issues
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Farm Pro 2420 Starter Issues
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Farm Pro 2420 Starter Issues
These bottom two things to try out were given on other forums, so I am going to try them out. Just including for people to know if they have the same issues.
"watching your video shows the solenoid is working ok, the bendix drive is extending and the armature is spinning as it should, now there is one more test you can do before you spend your money on a new starter and that is to lock the starter in a good vice and hook up the power cables and spin the starter, -- and with a piece of hardwood about 2x2 size, load up the bendix drive teeth with the wood, there is a one way clutch in the bendix that allows the armature to not over spin when the engine fires up, by loading the bendix, this tests the one way clutch to see if the clutch is holding, after time, they do slip.
If the bendix clutch is slipping, then the bendix can be replaced instead of the whole starter motor."
"While you have it off, Take the end off of the starter(opposite the gear end) and clean the carbon out of the brushes and off of the commutator where the brushes transfer current to the rotor. Shorted/messed up brushes, and or a weak connection to the starter could also cause stuttering/chattering. Voltage is good, you turn key to start, solenoid tries to engage, short or bad connection causes voltage drop, solenoid disengages, voltge surges, solenoid re-engages, repeat..."
Including so someone in future can us it to help troubleshoot
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Farm Pro 2420 Starter Issues
So I took it apart as advised cleaned every connection I could find, used a dang dremel wire wheel and shined all connections up. And here is new starter test.
Haven't tried testing with block of wood yet
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Farm Pro 2420 Starter Issues
So I took it apart as advised cleaned every connection I could find, used a dang dremel wire wheel and shined all connections up. And here is new starter test.
Haven't tried testing with block of wood yet
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Farm Pro 2420 Starter Issues
So before i forgot i wanted to share a few videos so future people can look and maybe it'll help them out with the starter. Take them with a grain of salt, tractor is in the field and I don't have a pretty shop  .
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Farm Pro 2420 Starter Issues
Video 2 of 5
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Farm Pro 2420 Starter Issues
Video 3 of 5
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Farm Pro 2420 Starter Issues
Video 4 of 5
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Farm Pro 2420 Starter Issues
Video 5 of 5
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Farm Pro 2420 Starter Issues
I was thinking that too. After pulling it off testing it, re installing testing, pulling off again and cleaning every nook and cranny of the starter, and testing again I just don't think its kicking the gear out far enough to turn the flywheel. Either it doesn't have the balls so to speak or just not engaging.
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Farm Pro 2420 Starter Issues
Also I have looked for a bendex earlier. Honestly less of a headache and not much more of a cost to just get a complete starter.
Chinese parts are just a pain.
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Farm Pro 2420 Starter Issues
I talk to a old timer tractor repair guy here that does tractor work for area farmers. He thinks he may have a starter that will work so when I get my hands on it we will see . No worries my memory isn't the beat anymore either.
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Farm Pro 2420 Starter Issues
Alright got a new starter and yep it was something wrong with the old starter
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Farm Pro 2420 Starter Issues
Hopefully someone in future gets some help from this thread. Ill be making a separate thread on how i troubleshot and fixed a fuel issue. Thank you everyone that help me with this.
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Farm Pro 2420 Starter Issues
Ya definitely, dang thing was making me pull what little hair out I have left.
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Farm Pro 2420 Starter Issues
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parks, what proved to be the problem? Just wondering. bogman, for a person asking where the mechanics were did a great job. ...
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It was the internals of the starter. Given the price to take it and rebuild it I was able to just buy a new one for just as cheap.
I did take it to a friend which has family that rebuild these things. Only information I got was internally connections where not connecting properly.
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Farm Pro 2420 Starter Issues: Jinma Farmpro Agracat Nortrac -- Other Tractor Brands Discussion Forum
05-31-2019, 20:45 
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