M8540 blower resistor alternatives

[bunchgrass]

Hey all,

I've seen a few posts about the cabin fan speed issue that's usually a resistor problem. I'm having that right now - good speed on 1,2,3 but 4 (high) is about like 1 or less. So want to change out the resistor but damn, ~ $100 seems ridiculous. Anyone found another resistor (not Kubota) that is the same as OEM but cheaper? Thanks.

Current 2012 M8540 with 2100 hrs (all mine). Cabin, 4WD, 12spd. Knocked my own front windshield out last month while putting the loader back on after haying. Stupid

 

[GreensvilleJay]

got a picture of it or the value ?? xx ohms / yy watts ??

 

[bunchgrass]

got a picture of it or the value ?? xx ohms / yy watts ??

I can post the pic of the OEM part number T1275-72180.

 

[GreensvilleJay]

OK, that's not a 'resistor', looks like it has 3 resistors inside of it.
sounds like one of the resistors has opened.
I checked the part online, yup the 'module' sits in the duct, has 3 resistors in it, one of which is open...
now if you had a good DVM, you could check the resistances and bodge a replacement.
I agree $100 (US ) is an obscene price BUT it's the correct part, cheaper than having dinner out though !

 

[Dustball]

Actually, this sounds like the opposite of a bad resistor. Typically a blower motor resistor pack has high to low resistance for low to high fan speeds. The highest fan speed is usually full battery voltage, no resistor.

Edit- found the M8540 WSM. It is what I suspected- for high speed, the resistor pack is fully bypassed allowing the blower motor full access to ground through the blower high relay.

If you are getting nothing from the blower when it's switched to high, look at either the blower high relay or the switch itself. Don't condemn the component without verifying the wiring and/or connections are still good. You may have corrosion at the connectors or at the grounding point.

 

[GreensvilleJay]

sure helps to see the wiring ! since no 'high', check the 'high blower relay (6)' --- switch (8) connections.
grounding the lower relay terminal should power up the relay and give fan high speed.
should be able to pull the relay, bench test.

 

[bunchgrass]

Resurrecting an old thread as my blower is acting up again --- blows normal on 1, 2,3 settings but only lightly on high (4). I know this was discussed above but in looking at the service manual I see this message


Functional Check

NOTE
• The relays described here are used same ones so that these
are interchangeable.

Does that mean I could swap one relay for another to test for a bad one?

 

[North Idaho Wolfman]

Functional Check

NOTE
• The relays described here are used same ones so that these
are interchangeable.

Does that mean I could swap one relay for another to test for a bad one?

Yes

 

[bunchgrass]

Success. Swapped #12 aux power relay for #11 high blower relay and she blows! Old #11 had some odd corrosion on one of the blades. Ordering a replacement (not what ever the heck that was I posted above.)
This is real deal.

 

[Dustball]

Success. Swapped #12 aux power relay for #11 high blower relay and she blows! Old #11 had some odd corrosion on one of the blades. Ordering a replacement (not what ever the heck that was I posted above.)
This is real deal.
View attachment 170489

Buy a couple to keep on hand for spares-

https://www.digikey.com/en/products/detail/panasonic-electric-works/CM1A-R-12V/647140

I've bought two myself.

That's the OEM for Kubota pn RD451-54382.

 

[bunchgrass]

Thanks ---

I was look at the relay you linked to and it says it's a 35A 12V relay. The Kubota I was looking at is a 20A relay. RD451-54382. Is the Panasonic you linked tthe correct replacement? Did it take a while to get those components since I assume they're shipping from Asia?

 

[Hugo Habicht]

Digikey is a US company. You should get the parts within a day (a few years ago I got parts from them to Ireland within 24 hours).

And 35A is certainly more promising than the 20A Kubota relay that is burning out.