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Looking for suggestions to troubleshoot with , my tach and h/m are on same instrument , not sure where signal comes from , alternator or flywheel sensor? tractor has 250 hours , both tach and h/m will work on initial start for about 1 min , then freeze in their current reading until shutdown and restart.
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Do you have a pic of your panel?? On most tractors you have a tach sender at the flywheel,but since you are losing both it could be a bad power or ground,or a bad panel
Tommy
Affordable Tractor Sales
“Your Jinma PartsSuperstore”
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In my Jinma there is a flywheel sensor that triggers both hours and tach. It is on the left side (your left when you're sitting in the driver seat), about where you'd expect the flywheel to be. It is very sensitive to adjustment. To adjust: with the engine off, loosen the locknut and screw the sensor in until it touches the flywheel. Unscrew 3/4 turn and tighten the locknut. The sensor does seem to fail fairly often, I replaced mine after about 200 hours.
I don't know if your engine is similar, so this may not be helpful.
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Hi Guys , further investigation proved the Tach receives the signal from the Alternator , when the engine is running there should be between 6-14 volts AC between the Tach connection on the alternator and neutral , got this from another forum here on CTO , however I only have 1/2 Volt AC most of the time , therefore I think I need to order an alternator rebuild kit .
This site provided the info I needed to solve my issue , Thanks again guys
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Troysie wrote:
“therefore I think I need to order an alternator rebuild kit .”
All an alternator rebuild kit will have in it is a couple of bearings, brushes (unless it's brushless), and maybe a diode pack. It sounds to me like you possibly have bad stator windings.
Also: Good luck on finding a rebuild kit for a Chinese alternator.
You can most likely get the bearings at a bearing house, diodes at Radio Shack, and make your own brushes from a drill motor.
These alternators are TEFC, which is a good thing.
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On my tractor the alternator was such a wimpy little thing, putting out 15 amps, and the voltage regulator was a complete POS, that I replaced it with Delco 12Si (integrated regulator) two-wire type putting out a whomping 65 amps – what a huge difference in the lighting! I can now run two extra pairs of work lights, all headlights and anything else I need, including my 2000 watt inverter, without worrying about croaking the battery.
I got the 12Si for about $50 online and it bolted right on after I swapped the pulleys. Needed a better belt so I used a multi-link and all is good.
Just a suggestion if you are sure your alternator is bad – did you check its output voltage directly at the terminals when at 1200 rpm or higher?
Rich
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Hi Troy,
I have never had my hands on a YTO. I have received a couple of pic's from people on the smaller ones and around the engine is a lot like Jinma 200/300 series.
I am not saying the tach is not driven from the alternator but, diesel tractors that I have worked on use a sensor ….. easier/cheaper to get a accurate reading.
Looking forward to what you find out.
Ronald
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Here is a nice little read on alternator tach. signals.
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No, my tractor is a 304 Jinma with a TY395 engine. I got the alternator online from a place that sells them for boats and stuff, but if I lived in the States I'd have just gone to a junkyard for one or, failing that, to Autozone or some such. Pretty much any of the Delco 12Si alternators will work – just a slight difference in the two or three wire models. I opted for a 65-70 amp one, though they're available anywhere from about 40 to 100 amps capacity. I like the three-wire models as they start exciting at a lower rpm which is handy o a diesel tractor. But you can work around that by adjusting the size of the alternator pulley to some degree – not good to go too small, though.
I will say that changing my alternator was about the best hundred bucks I spent on the tractor. That's sixty for the alternator, twelve for the new voltmeter, and about twenty-five for the new segmented V-belt. I now have all the juice I need to run additional lighting and my 1500 watt inverter for running power tools in the field.
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We also have the upgraded OEM alternators 350watt or 500 watt
The standard 2JF200 is a 200watt that comes on the 254/284 tractors
Tommy
Affordable Tractor Sales
“Your Jinma Parts Superstore”
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