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Old 01-29-2011, 06:04 PM
ed53 ed53 is offline
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Default How to check the cooling fan

Hi all, this is my first post. My wife surprised me with a special edition kubota rtv 900 a few years ago and it has been great but it seems the fan is not working properly. Does anyone know the best way to test the cooling fan?
Thanks for any help.
Ed
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Old 01-29-2011, 06:33 PM
Onfoot Onfoot is offline
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Welcome to the forum, Ed! And what a lovely wife you must have! Certainly she has good taste in machinery! :-) You will find that the forum is a gold mine of useful (and sometimes entertaining) information and advice.

Re. your cooling fan, what makes you think it is not working? It is not supposed to run all the time, but will cycle on and off as needed for cooling. Also, the RTV900s tend to run with their temp gauges on the high side of the scale. A number of folks have replace the OEM gauges with after market models that show actual temperatures. But if it not in the red on the OEM scale, there is nothing to worry about.

But this may be stuff that you know well. So perhaps you can provide more details about why you think the fan might not be working? (If temp gauge is going into the red, have you checked that your radiator is clean, for example?)

Also, we like to see pics, so feel free to post!

Cheers,

Onfoot
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Old 01-29-2011, 09:49 PM
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Kanook Kanook is offline
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The electric cooling fan is controlled by a relay and the motor is protected by a 20A fuse. The manual states that the coolant temp of 201f will start the motor and it will shut off when temp cools to 194f. Hope this helps.
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Old 01-30-2011, 06:56 AM
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Default cooling fan operation

Thanks guys for your input! I knew it came on at what I considered to be a high temp. I checked the fuse and pulled the led off the temp sensor and grounded it and it did not come on. So I will try batt direct to the fan and if it does not work I will get a replacement motor. I assume the lcl auto parts store could match it up. I typically do all my own work so I need to get a good shop manual, what do you guys recommend? I have 5 tractors ranging from 1940-1974 and I have shop manuals for all of them. My 900 only has 300hrs on it and so far no problems, hope it will stay that way.
Again, thanks for your help,
ed
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Old 01-30-2011, 07:26 AM
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I have the shop manual and parts book. I paid around $80 to a $100 for the 2. I have heard that they are available on CD for a fraction of that .I ordered my books from Messicks eqp. (on the net) and it was delivered to my door. Good Luck, Bordercollie
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Old 01-30-2011, 09:21 AM
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Quote:
Originally Posted by ed53 View Post
Thanks guys for your input! I knew it came on at what I considered to be a high temp. I checked the fuse and pulled the led off the temp sensor and grounded it and it did not come on. So I will try batt direct to the fan and if it does not work I will get a replacement motor. I assume the lcl auto parts store could match it up. I typically do all my own work so I need to get a good shop manual, what do you guys recommend? I have 5 tractors ranging from 1940-1974 and I have shop manuals for all of them. My 900 only has 300hrs on it and so far no problems, hope it will stay that way.
Again, thanks for your help,
ed
Provided that the key switch was in the "on" position, grounding the lead to the temp sensor should have picked the relay that controls the fan motor. The relay is on a separate fuse (15A). This is according to the schematic in the manual. There are also a 50A and 60A sloblo that could affect fan operation but would also affect other things as well...Not likely. As you have already said..applying 12vdc to the hot lead on the cooling fan motor will tell you if the fan motor is cooked...

Let us know the out come.
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Old 01-30-2011, 11:29 AM
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Default Ed' cooling fan

Ok guys, fan works(direct from batt). Does not work when grounding the lead off temp. Checked all fuses and they are good, all I can think is the fan relay is bad. There is a 15amp fuse that controls relay for fan, alt, and brake lgts. They all work, unless there is part of the relay that controls the fan, I am stumped. Going to call the dealer tomorrow and ask them, hopefully they will have some info.
Again, thanks for your help.
ed
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Old 01-30-2011, 11:37 AM
Onfoot Onfoot is offline
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Quote:
Originally Posted by ed53 View Post
Ok guys, fan works(direct from batt). Does not work when grounding the lead off temp.
I do not profess to know much about such matters (I am a mechanical blunderer more than anything else), but is it not the case that the temp. point would only have power if the thermostatic relay was in the 'on' position--i.e., the engine temp would need to be hot enough to trip the relay and therefore supply power to the temp lead?
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Old 01-30-2011, 12:41 PM
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If the fan motor operates with 12vdc direct (which it does) then the only thing it can be is the relay or the fuse or the coolant temp switch. (which is not the sending unit for the temp gauge). According to the schematic there is a 15A fuse for the relay and a 20A for the motor. According to the diagram I am refering to there should be a Purple wire running from the temp sw to the relay. Grounding this wire should pick the relay.

Are you sure the coolant is just not getting hot enough to activate the switch?
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Old 01-31-2011, 04:10 AM
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My fan rarely comes on in my 2006 900. The only time it comes on is if I have been really working it hard. High speed running on the road brings the temp up enough to kick it on but normal putting around hauling wood does not.
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Old 01-31-2011, 06:12 AM
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Default cooling fan working

Thanks guys for all your input. The fan does work when I ground the wire off the switch. Fan appears to be working fine, comes on when the gage reaches about 2/3 warm. That problem is solved, but you guys got me keeping a close eye on my U joints. They appear to be ok.
Thanks guys,
ed
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Old 01-31-2011, 08:38 AM
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Now ..... Back to the original entry.....Your spouse surprised you with the 900 on your birthday....SO what am I doing wrong here????Mrs Kanook surprised me with a new coffee maker (she broke the old one)...Any suggestions on where I am going astray here??????
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Old 01-31-2011, 05:15 PM
ed53 ed53 is offline
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Default 900 for birthday

Yea, the salesman wanted to know if she had a sister!
ed
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Old 02-09-2011, 07:10 PM
cov62431 cov62431 is offline
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If you have a testlight, you can hook it to the pos. terminal on the battery and touch the probe to the temp. sensor above the alternator. You should get a light on your testlight and the fan will come on. This will test your relay and fan together.
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