what has caused my fuse to melt on my Jinma: Jinma Farmpro Agracat  -- Chinese Tractors Discussion Forum and Review what has caused my fuse to melt on my Jinma: Jinma Farmpro Agracat -- Chinese Tractors Discussion Forum

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 03-20-2011, 16:25 Post: 177474
neilgoody



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 what has caused my fuse to melt on my Jinma

When tying to start my Jinma by using the glo plug setting on the ignition- after 4 seconds the actual 30 amp plastic casing on the fuse melted , it did not blow the actual fuse wire, but smoke was visible! since this happened I have nothing at all when i turn the switch, it is completely dead. Do you have any ideas please? I am only a novice and very confused about this! Any help greatly appreciated






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 03-20-2011, 18:35 Post: 177477
greg_g



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 what has caused my fuse to melt on my Jinma

Despite what it looks like, that fuse is likely blown. Remove and discard it. Check for heat damage to the fuse holder, you may have to replace the fuse panel as well.

Later machines fused the glow plug circuit separately. Sounds like yours one of the older ones where the GP circuit is protected only by the system fuse. When the system fuse goes, nothing works. Probable cause is a short in the glow plug circuit.

The glow plugs are tied together with either a copper buss bar or a short set of wires. Inspect it for any way the bar or wires are touching metal (other than the glow plugs themselves). If not, follow the bar or the wire set to a connecting point, usually close to the lower front side of the fuel tank. Disconnect the buss bar/wire set from the electrical system. Assuming the fuse holder is usable, plug in a new 30A system fuse. If you don't blow another fuse, it's time to replace the glow plugs.

//greg//






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 03-21-2011, 13:14 Post: 177489
neilgoody



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 what has caused my fuse to melt on my Jinma

Thanks so much for that information, the tractor is an older one (1999)so therefore I will check the fuse panel and replace the fuse as advised. I will let you know after i have done this.Your help is greatly appreciated!
Neil.






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 04-03-2011, 16:08 Post: 177767
neilgoody



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 what has caused my fuse to melt on my Jinma

Thanks for the advice, all working now and electric system back up and running,took the advice and replaced the glo-plugs.Neil.






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 04-03-2011, 23:23 Post: 177770
greg_g



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 what has caused my fuse to melt on my Jinma

One point about replacing the GPs. Each has a tiny little copper sealing washer. I hope you accounted for all three old rings before you installed the new GPs and new sealing rings. Cuz the old ones sometimes don't want to come out with their GPs

//greg//






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 05-08-2011, 09:34 Post: 178355
neilgoody



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 what has caused my fuse to melt on my Jinma

more problems!So Sad since replacing my GP's and managing to get the tractor going ok- i then tried to start it again and nothing!dead again!! just a click which i believe was from solenoid area? I followed an earlier thread on forum re starting problems 'starter dead' and followed instructions about jumping terminals S and M to energize solenoid, then jumping terminals M and B- this did spin the starter motor. Do i need a new solenoid?
Any help greatly appreciated
Neil.






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 05-08-2011, 09:47 Post: 178356
greg_g



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 what has caused my fuse to melt on my Jinma

Not familiar with where you may have come up with those designators, so I'll postulate
B+ is likely the large post where the positive battery cable is attached
M is likely the motor post (the 2nd large post)
S is likely the small switch post on the solenoid

1. Jumping B+ and M tests the starter motor. It either spins or it doesn't. Operative word is "spin", this test will not actually turn over the engine. If it spins, move on to #2. If it doesn't, the starter's shot.
2. Jumping B+ and S tests the starter solenoid AND starter motor. This test should in fact turn over the engine. If it doesn't, the solenoid's shot. If it does, move on to #3
3. Turning the key to START should replicate test #2. If it does, you're good to go. If it doesn't, you have either a bad switch or a bad connection between the switch and the solenoid. If/when you get to this point, we can pick up the troubleshooting from there.

//greg//






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 05-09-2011, 11:18 Post: 178375
neilgoody



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 what has caused my fuse to melt on my Jinma

hi,
Did the 1st test jumping the said terminals- this did spin.
Did 2nd test but this didnt turn over the engine.
need to do test 3 yet to check switch, but looks like solenoid shot.
thanks
Neil






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 05-09-2011, 11:24 Post: 178376
greg_g



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 what has caused my fuse to melt on my Jinma

Don't waste your time on test 3 right now, just order a new solenoid. Reason being is that test 2 isolated the keyswitch, the clutch interlock switch and all the associated wiring. Once the new solenoid is installed, repeat test 2. Assuming it passes, THEN perform test 3 to make sure everything's good between the keyswitch and the solenoid.

//greg//






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 05-11-2011, 14:49 Post: 178409
neilgoody



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 what has caused my fuse to melt on my Jinma

Greg Thanks once again.I have taken another look today and noticed that the S terminal was very loose and i could waggle it about.Can i take the solenoid apart? this i have never done before. There seems to be two Philips screws holding it together but on loosening these there was a resistance,is this because of the magnets and i just wasn't brave enough to prise apart.Or am i wasting my time?? Thanks
Neil






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Discussion Boards > Active Subjects > Messages as Posted > Jinma Farmpro Agracat Forum

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