Not an old tractor, but wondering if anyone has some input on an intermittent AC problem. Some days the AC will work like normal and the next day the compressor won't kick on. Then the following day, it will work again. It can be a warm day or a cooler day. Condensor and radiator are clean. AC was checked at dealer (but was working that day). This is a Case Maxxum, just seeing if it might be a sensor that would cause this.
- Thread starter mlauk
- Start date
Janicholson
Well-known Member
there may be a loose or failing relay in the system. The pressures are probably fine, when it won't work is when analysis needs to be accomplished. A wiring diagram, and a test light are minimal required tools. Jim
wore out
Well-known Member
Connect a test light at the compressor clutch connection and operate the tractor with it connected until it acts up.
This will tell if the problem is in the controls and wiring or in the clutch itself.
Some compressor clutches (especially the Sandens with a tin cover over the clutch) can get flaky and not always engage when power is applied.
Do you know what compressor your tractor has or can you post a photo?
wore out
Well-known Member
Open clutch.
Covered clutch.
In my experience, I have seen more Sandens with the covered clutch act up than with the open clutch (which you would think is a good idea).
Trouble is, with the covered clutch you can't see if it actually engaged and is driving the compressor.
Anyhow, I'd start my troubleshooting by connecting a test light and determine whether or not the clutch is being powered while the system is not cooling.
Just this season I dealt with one on a MF windrower and a 2188 CIH combine that would act up.
Both compressors got replaced as just changing the clutch is not much of a thing anymore and both systems worked flawlessly after that.
onefarmer
Well-known Member
- Location
- 6735 S Lowell Rd, St Johns, Mi 48879
Check your system voltage. My F250 was doing that and it turned out the voltage regulator was very intermittent on how much voltage it would make. I put a volt meter in the power port and found it.
Hobo,NC
Well-known Member
- Location
- Sanford, NC
I suggest you google "how does a magnetic ac clutch work"
One farmer is correct the voltage to the clutch is suspect. They become problematic with as little as 1 volt drop. Just because you dash gauge looks normal voltage can drop in the circuit to the clutch coil. Voltage drop is not as much a problem on modern systems as it use to be it is one of those forgotten test.
A quick down and dirty test is to bump the clutch hub with a wood rod if it applies a "worn clutch hub", coil are "low voltage" is suspect. You can also put a metal wrench are extension on the clutch hub are retaining nut. If it sticks the metal to the clutch (magnetism) suspect the same. This test is normal as most compressors are not easily accessible in my world.
Read and understand how it works, the test are basic as basic gets. There are work rounds to some clutch issues but first confirm proper circuit operation.
One farmer is correct the voltage to the clutch is suspect. They become problematic with as little as 1 volt drop. Just because you dash gauge looks normal voltage can drop in the circuit to the clutch coil. Voltage drop is not as much a problem on modern systems as it use to be it is one of those forgotten test.
A quick down and dirty test is to bump the clutch hub with a wood rod if it applies a "worn clutch hub", coil are "low voltage" is suspect. You can also put a metal wrench are extension on the clutch hub are retaining nut. If it sticks the metal to the clutch (magnetism) suspect the same. This test is normal as most compressors are not easily accessible in my world.
Read and understand how it works, the test are basic as basic gets. There are work rounds to some clutch issues but first confirm proper circuit operation.
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