My 425 fan failed!!

BobRip · May 22, 2005

On my 422 the switch is set at 120 deg F. An hour seems like more than enough time to turn on the fan. Is the thermal switch in good physical contact (not loose) with the block it is mounted to? Is it clean between these two services. I know that the fluid for the wheel circuits does not go through the hydraulic cooler. If you use the PTO the fan is more likely to come on. At this time of year it should come on. Try heating the switch in a pan of hot water while slowly raising the water temperature.

Bob Rip

menchhofer · May 22, 2005

When I mounted the switch I was certain it did have good contact and firmly attached...I will keep an eye on it and if it continues not to work I will connect the two wires together and run it off the ignition........

RegL · May 25, 2005

" fluid for the wheel circuits does not go through the hydraulic cooler."

Thats interesting. I was doing some hard mini-hoe and loader work last week. The tank was getting pretty hot and wondered why the fan didn't come on. Maybe it would be better if the thermostat was attached to the tank.

Highridge · May 25, 2005

So the PTO lines run through the cooler?
(I haven't used the PTO much, that's probably why the fan hasn't came on yet)
I tested my fan today with a hair-dryer and it came on. First time it has since I bought the tractor last month. I was suprised how much air it moved. I did put a 30 amp fuse in just for kicks.

BobRip · May 25, 2005

The thirty amp fuse will now be protected by the wire burning up if there is a short circuit. I have a 10 amp fuse and I don't believe that it has blown. The fuse holder wore out at 400+ hours. Go back to a 10 amp fuse. Replacing the wiring is not easy. Having the tractor catch on fire (which is the main thing a fuse prevents) would be even worse. I am not an expert in this area, but I do have a degree in electrical engineering, I wired my own house, and I have designed production electrical equipment, and consumer electronics devices, so I am not novice either.

BobRip

pequeajim · May 25, 2005

amen... hallalujah brother. /forums/images/graemlins/wink.gif

Highridge · May 26, 2005

O.K, I'll put old fuse in. (BTW, it was a 20amp fuse)

MossRoad · May 26, 2005

<font color="blue"> 30 amp fuse </font>

YIKES! /forums/images/graemlins/grin.gif

As mentioned, if you let the smoke out of the wiring, it is hard to get it back in. /forums/images/graemlins/wink.gif

Trust me, as I have done that and wished I hadn't... (and I have two degrees in electronics and did it anyway. Call it "hands-on experimentation". I just wanted to personally test all those theories they were teaching us /forums/images/graemlins/shocked.gif /forums/images/graemlins/laugh.gif /forums/images/graemlins/tongue.gif).

Highridge · May 26, 2005

O.k. All Set
I put the 20amp back in and tested the fan again. Works Great!

menchhofer · May 26, 2005

So I believe I have learned from this discussion the cooler is used for PTO operations and if one is not using the PTO then the fan would probably not be activated. Interesting.