TC40D fuses: New Holland Tractor Review  -- New Holland Tractors Discussion Forum and Review TC40D fuses: New Holland Tractor Review -- New Holland Tractors Discussion Forum

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 05-21-2002, 20:40 Post: 38886
chris82715



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 TC40D fuses

I haven't heard of anyone having a similar problem, but my TC40 (28 hours) wouldn't start the other day. I found the #2 fuse blown and replaced it only to have it blow when I tried to start the tractor. My dealer says they have had some problems with the fuel solenoid causing this, and they are supposed to be out to repair it tomorrow. Just a heads up, and I'll let you know what the fix is.






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 05-22-2002, 07:54 Post: 38899
DavidJ



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That's good to know. Did the dealer go into whether it was a rash of defective solenoids or something else to cause the failure?






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 05-22-2002, 18:02 Post: 38909
cutter



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 TC40D fuses

Chris,

I don't know if this is related, but my tc29d would not start the first time after it was delivered. I went through a box of fuses trying to find the problem and it turned out to be a shorted glow plug in the pre-heat system. The instant you would hit the key the fuse popped.






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 05-22-2002, 19:28 Post: 38912
Steve W
2002-05-22 00:00:00
Post: 38912
 TC40D fuses

That is really strange, one week ago I couldn't get my TC40 started. It is 120hrs on it. Guess what it was the same fuse






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 05-23-2002, 05:11 Post: 38926
TomG

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 TC40D fuses

It's got my curiosity up a bit, and I'm curious what size of fuse was blowing. Glow plugs draw quite a bit of current. Wiring systems are different, but on my Ford 1710 the glow plug circuit doesn't run through the fuse box. Protection is provided by a fusible link, which also protects other circuits. Fusible links are sort of like main breakers. Such a design avoids bringing high current wiring into the fuse box, but it's a pain if the fusible link ever blows. Fortunately, newer tractors don't have fusible links, but I don't know what replaced them.






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 05-23-2002, 09:36 Post: 38944
chris82715



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 TC40D fuses

Ok, here is the scoop from my dealer. The #2 fuse (10 amp) covers the fuel solenoid and a couple other things I can't remember. they say that the solenoid draws a lot of amps, and coupled with the other draw while starting, this overloads the fuse. They installed a circiut breaker in the fuse slot and say this should take care of it. Apparently there is nothing wrong with the solenoids, there is just too much draw for the circuit
On a second note, I was having problems with the brake release. I would set the brake and then when climbing off the tractor it would release. NH has issued a service bulletin on this and they have a new setup to be installed, including new brake pedals and brackets.

I'll let you know if anything else comes up.

CT






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 05-23-2002, 09:59 Post: 38948
DavidJ



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What size breaker did they install? If they installed a larger one is the wiring sufficient? Sounds like NH didn't do their field testing thouroughly enough.






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 05-23-2002, 10:37 Post: 38950
cutter



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 TC40D fuses

Tom, I no longer have the machine so I can't check the fuse size. It was a seperate link though.






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 05-24-2002, 06:18 Post: 38973
TomG

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It makes sense that glow plugs have their own link. I think the cold glow plug draw on many tractors would be more than 30A. Certainly there's enough capacity below the fused protection level to heat things up and potentially start fires. Seems like good design if high current carrying wires don't run anyplace they don't have to.

Regarding NH replacing a fuse with a breaker: The breaker could be the same value as the fuse. I think breakers take a bit longer to pop than ordinary fuses. I know there are slow-blow fuses used in circuits that feed electric motors, but I think these fuses are too slow to provide protection for devices other than motors.

If the fuel solenoid has a startup surge and that's what's popping the fuse, a breaker may fix the problem. At any rate, the solution may seem a bit odd, but you've got to go with the factory solution and assume it's adequately engineered. Another possibility is that the wiring is over-designed to start with and a slightly larger fuse/breaker is within what ever standards apply.






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 05-25-2002, 08:29 Post: 39022
chris82715



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It is a 10 amp breaker they installed. I have started the tractor about a dozen times since and have had no problems. so far so good!






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Discussion Boards > Active Subjects > Messages as Posted > New Holland Tractor Review Forum

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