Heater fan speed
- Thread starter Hartless
- Start date
Blower speed problems often reside in the blower resistor which you access by taking off the cab roof.
I have attached a page from the WSM showing how to test the resistor.
Dave
I have attached a page from the WSM showing how to test the resistor.
Dave
Attachments
Blower speed problems often reside in the blower resistor which you access by taking off the cab roof.
I have attached a page from the WSM showing how to test the resistor.
A page from parts illustration showing location of resistor.
Dave
I have attached a page from the WSM showing how to test the resistor.
A page from parts illustration showing location of resistor.
Dave
Attachments
Battery was low at 11.75 amps.
When started the battery tested above 14. I disconnected the power going to the blower motor and tested the volts going to the blower. All 3 speeds tested at 13.6 volts. When I disconnect the resistor the power tested on speed 3 is 13.6. Nothing at speed 1 and 2 with the resistor disconnected.
When started the battery tested above 14. I disconnected the power going to the blower motor and tested the volts going to the blower. All 3 speeds tested at 13.6 volts. When I disconnect the resistor the power tested on speed 3 is 13.6. Nothing at speed 1 and 2 with the resistor disconnected.
I have attached more info based upon eserv's wiring diagram.
It took me a little while to realize how the speed control is achieved.
In low speed, power for the blower passes through both internal resistors in the resistor.
In high speed, power bypasses the resistor completely utilizing a high speed relay controlled by the blower switch.
In medium speed, power utilizes one of two internal resistors within the main resistor and is controlled by a second medium speed relay which the blower switch turns on.
See if you can identify these two relays. It is possible the blower switch is gone but unlikely as it only switches relay trigger current.
A 5 amp fuse looks important in providing the blower switch with power to trigger both relays.
Dave
It took me a little while to realize how the speed control is achieved.
In low speed, power for the blower passes through both internal resistors in the resistor.
In high speed, power bypasses the resistor completely utilizing a high speed relay controlled by the blower switch.
In medium speed, power utilizes one of two internal resistors within the main resistor and is controlled by a second medium speed relay which the blower switch turns on.
See if you can identify these two relays. It is possible the blower switch is gone but unlikely as it only switches relay trigger current.
A 5 amp fuse looks important in providing the blower switch with power to trigger both relays.
Dave
It's the blower motor. After running a bunch of voltage and amp tests I hooked up an extra blower motor my buddy had for a duramax and it worked on all 3 speeds. Kubota wants $500 for the blower motor. I am calling a shop to see if they can clean it and put new bushings in it. If not, I am buying one online for $35 that is close to fitting and will make it work.Thanks for helping out with diagnosing the problem. I appreciate it.
Dave, I appreciate all the help you offer folks with their electrical problems. I read them all and try to learn. I have to read it (usually more than once), and then physically do it to really get electrical stuff in my head!
I'm a slow learner, but your diagrams and input really helps. Thanks.
I'm a slow learner, but your diagrams and input really helps. Thanks.
Does anyone know of a replacement blower motor that may fit in place of a Kubota blower motor? Or any reason why a $35 blower motor shouldn't be used to replace the $500 Kubota with a little modification. Thanks.
Bringing mine in Monday to a shop so it can be looked at and maybe fixed but the guy said they purposely do not make replacement parts so you have to buy a new one
Bringing mine in Monday to a shop so it can be looked at and maybe fixed but the guy said they purposely do not make replacement parts so you have to buy a new one
Thanks. Greatly appreciate your comments D2Cat!
When writing a post, I try and remind myself of how little I knew 60 years ago and how many people helped me along the way and write accordingly. In the beginning, invisible electricity is difficult to understand for everyone.
Dave
A few months ago helped a neighbor with his M9540 cooling system. He had to replace the motor on his tractor. The motor is mounted in a housing that could not be duplicated with any stock motor. Maybe your is different, but I have my doubts. Good luck and post some picture of the motor when you can. Thanks.
BAP
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2012 Kubota 2920, 60MMM, FEL, BH65 48" Bush Hog, 60"Backblade, B2782B Snowblower