Electrical

[kub boy]

I have a 2012 John Deere 2730 cab model with a/c and heat. Intermittently the a/c or heat and fan refuse to come on or it comes on after several minutes of usage. I'm thinking a problem with the ground? I also notice that my front wiper fails at the same time as the HVAC system. Anyone else ever run into this problem?

 

[Tx Jim]

Welcome to TBN
My guess is your tractor has a faulty cab accessory relay

 

[kub boy]

Thanks, I will try ordering one from the dealer.

 

[Slowpoke Slim]

Don't know if you have access to the shop manual for your tractor. But one thing I would be looking for is a block connector somewhere along that wiring harness that has those specific circuits running through it. Check those connections there. Look for loose, or corroded or wet contacts.

I seriously doubt it's a "relay" issue. Usually when a relay goes, it's permanent. Not an intermittent issue. I would not just start shotgunning parts all willy-nilly. Sounds to me like a circuit contact problem.

 

[LouNY]

On some of the IH's an intermediate ground issue will drop out some relays, a restart and they may hold for 10 minutes or 10 hours

 

[IndyJay]

I seriously doubt it's a "relay" issue. Usually when a relay goes, it's permanent. Not an intermittent issue. I would not just start shotgunning parts all willy-nilly. Sounds to me like a circuit contact problem.

I have seen weak relays that will drop intermittently before failing completely.

 

[PILOON]

Since it comes on after a bit I'd suggest the fan bearings ,probably bushings*, are the issue.
If bushings oiling them will be the cure, with bearings--replace them.

* WD40 would free up a bushing but you will still want to oil the bronze bushings.

 

[workinonit]

How do you explain the wiper in your scenario?

 

[Slowpoke Slim]

How do you explain the wiper in your scenario?

Yes, these fixes don't fit the symptoms.

I would start checking wiring harnesses coming in and out of the cab first.

But some folks fix things by "shotgunning" parts and some folks fix things by looking for the culprit based on the symptoms.

"Shotgunning" will eventually fix the problem. Sooner or later you will stumble over the actual problem, in your quest to replace your tractor, one part at a time.

 

[N80]

All the electrical problems I've ever had in my tractor came from mice.

 

[jaxs]

All the electrical problems I've ever had in my tractor came from mice.

Those dirty rats.

 

[N80]

It is funny but worth considering. Look for frayed and gnawed on wires.

 

[NormL]

It is funny but worth considering. Look for frayed and gnawed on wires.

Hmm,,, maybe wire manufacturers could add a delectable dose of warfarin to the recipe?

 

[PILOON]

Hmm,,, maybe wire manufacturers could add a delectable dose of warfarin to the recipe?

That or stop using soy (food) based insulation.

 

[rScotty]

That or stop using soy (food) based insulation.

Is that really what the insulation is made from? I don't have the slightest idea myself but am curious how you know.
rScotty

 

[bearthebruce]

I was aware they used soy oil in the machines that add the insulation to lube things. I was not aware the insulation was a soy based material.

 

[bearthebruce]

Google is our friend: https://nhoilundercoating.com/soy-based-wiring-how-to-help-keep-mice-out/

 

[Richard001]

"Shotgunning" will eventually fix the problem. Sooner or later you will stumble over the actual problem, in your quest to replace your tractor, one part at a time.

That's what the "technicians" at my local Chev dealership do. They just keep throwing parts at it until it's fixed. And OH by-the-way, they leave the parts in that didn't fix it and charge me for it.

Oh for the days when there were real mechanics instead of part replacers.

 

[rScotty]

Google is our friend: https://nhoilundercoating.com/soy-based-wiring-how-to-help-keep-mice-out/

uh.....OK. I was buying it until I came to the end and found that "article" is actually an advertisement for undercoatings. And that their source was their manufacturing association news blurb.
Sheesh,
rScotty

 

[Williy]

Its a good idea to first check your wiring
connections before buying parts.
You should always check your manual
in the problem section if you have one is
the first place to start because most of
the time all answers are there for what
you should check or where to start first!

willy