Net Tractor Talk

       

Go Back   Net Tractor Talk > Other Equipment Forums > Kubota RTV Owners Group Forum

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 01-29-2011, 06:04 PM
ed53 ed53 is offline
Junior Member
 
Join Date: Jan 2011
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
ed53 is on a distinguished road
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
Reply With Quote
  #2  
Old 01-29-2011, 06:33 PM
Onfoot Onfoot is offline
Senior Member
 
Join Date: Apr 2007
Location: in the bush, near Whitehorse, Yukon, Canada
Posts: 468
Thanks: 0
Thanked 0 Times in 0 Posts
Onfoot is on a distinguished road
Default

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
Reply With Quote
  #3  
Old 01-29-2011, 09:49 PM
Kanook's Avatar
Kanook Kanook is offline
Senior Member
 
Join Date: Feb 2010
Location: CANADA
Posts: 507
Thanks: 43
Thanked 53 Times in 36 Posts
Kanook has a spectacular aura aboutKanook has a spectacular aura about
Default

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.
Reply With Quote
  #4  
Old 01-30-2011, 06:56 AM
ed53 ed53 is offline
Junior Member
 
Join Date: Jan 2011
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
ed53 is on a distinguished road
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
Reply With Quote
  #5  
Old 01-30-2011, 07:26 AM
bordercollie's Avatar
bordercollie bordercollie is offline
Senior Member
 
Join Date: Apr 2007
Location: central Mississippi
Posts: 3,243
Thanks: 407
Thanked 284 Times in 201 Posts
bordercollie is on a distinguished road
Default

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
Reply With Quote
  #6  
Old 01-30-2011, 09:21 AM
Kanook's Avatar
Kanook Kanook is offline
Senior Member
 
Join Date: Feb 2010
Location: CANADA
Posts: 507
Thanks: 43
Thanked 53 Times in 36 Posts
Kanook has a spectacular aura aboutKanook has a spectacular aura about
Default

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.
Reply With Quote
  #7  
Old 01-30-2011, 11:29 AM
ed53 ed53 is offline
Junior Member
 
Join Date: Jan 2011
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
ed53 is on a distinguished road
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
Reply With Quote
  #8  
Old 01-30-2011, 11:37 AM
Onfoot Onfoot is offline
Senior Member
 
Join Date: Apr 2007
Location: in the bush, near Whitehorse, Yukon, Canada
Posts: 468
Thanks: 0
Thanked 0 Times in 0 Posts
Onfoot is on a distinguished road
Default

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?
Reply With Quote
  #9  
Old 01-30-2011, 12:41 PM
Kanook's Avatar
Kanook Kanook is offline
Senior Member
 
Join Date: Feb 2010
Location: CANADA
Posts: 507
Thanks: 43
Thanked 53 Times in 36 Posts
Kanook has a spectacular aura aboutKanook has a spectacular aura about
Default

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?
Reply With Quote
  #10  
Old 01-31-2011, 04:10 AM
muleman's Avatar
muleman muleman is offline
Senior Member
 
Join Date: Apr 2007
Location: Ny/Pa. border
Posts: 892
Thanks: 23
Thanked 35 Times in 29 Posts
muleman is on a distinguished road
Default

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.
Reply With Quote
  #11  
Old 01-31-2011, 06:12 AM
ed53 ed53 is offline
Junior Member
 
Join Date: Jan 2011
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
ed53 is on a distinguished road
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
Reply With Quote
  #12  
Old 01-31-2011, 08:38 AM
Kanook's Avatar
Kanook Kanook is offline
Senior Member
 
Join Date: Feb 2010
Location: CANADA
Posts: 507
Thanks: 43
Thanked 53 Times in 36 Posts
Kanook has a spectacular aura aboutKanook has a spectacular aura about
Default

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??????
Reply With Quote
  #13  
Old 01-31-2011, 05:15 PM
ed53 ed53 is offline
Junior Member
 
Join Date: Jan 2011
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
ed53 is on a distinguished road
Default 900 for birthday

Yea, the salesman wanted to know if she had a sister!
ed
Reply With Quote
  #14  
Old 02-09-2011, 07:10 PM
cov62431 cov62431 is offline
Senior Member
 
Join Date: Jan 2011
Location: Southern, Louisiana
Posts: 157
Thanks: 0
Thanked 4 Times in 3 Posts
cov62431 is on a distinguished road
Default

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.
Reply With Quote
The Following 2 Users Say Thank You to cov62431 For This Useful Post:
phastmac (01-19-2015), thunderdome (06-27-2015)
  #15  
Old 01-19-2015, 06:06 PM
phastmac phastmac is offline
Junior Member
 
Join Date: Jan 2015
Posts: 2
Thanks: 1
Thanked 0 Times in 0 Posts
phastmac is on a distinguished road
Default

I did what you suggested. The fan came on but the test light didn't light up. So, I am guessing the sensor is bad. Thanks for the instruction.
Reply With Quote
  #16  
Old 01-19-2015, 08:22 PM
Mark.Sibole Mark.Sibole is offline
Senior Member
 
Join Date: Apr 2011
Location: Fife Lake Michigan
Posts: 1,156
Thanks: 30
Thanked 96 Times in 77 Posts
Mark.Sibole is on a distinguished road
Default

As stated above there are 3 things to effect the fan basically.The relay the temp sensor and fuse.when the ignition is on it throws the relay to apply a constant 12 volts to the fan. when the engine heats up do its desired temp the temp sensor switch will activate and apply a ground to the circuit completing the connection to make the fan to come on.If you have checked the fuses and they are good it leaves the temp sensor or the relay.If you disconnect the wire from the sensor and apply the wire to ground the fan should come on.If not its the relay.It is a very basic circuit to troubleshoot.On my 2004 the sensor just went south on me.They range from 29 to 54 depending on what one you have.In the mean time i keep a close eye on temp and if i see it running a bit hot i just flip a switch I added that completes the circuit to ground and let the fan run.If you turn off they key the fan goes out.So there is no worries to run down the battery.When i get caught up with bills and such ill replace the sensor but for now the switch works fine.In fact the way I have it wired in on pigtails its set up for a duo system.It can be done manually or fully automatic. Hope my rambeling helped.
Mark
Reply With Quote
  #17  
Old 01-20-2015, 05:54 PM
phastmac phastmac is offline
Junior Member
 
Join Date: Jan 2015
Posts: 2
Thanks: 1
Thanked 0 Times in 0 Posts
phastmac is on a distinguished road
Default

Thank you for the help. I may do the manual switch too.
Reply With Quote
  #18  
Old 01-20-2015, 06:29 PM
rjglenn rjglenn is offline
Member
 
Join Date: Jun 2010
Location: Fort White, Fla.
Posts: 58
Thanks: 10
Thanked 8 Times in 7 Posts
rjglenn is on a distinguished road
Default

Down here in Florida the fix is simple. Cut the blade connector off and install an eye and bolt that sucker to ground so the fan runs all the time - at least whenever the key is on.
Reply With Quote
  #19  
Old 01-20-2015, 08:28 PM
bordercollie's Avatar
bordercollie bordercollie is offline
Senior Member
 
Join Date: Apr 2007
Location: central Mississippi
Posts: 3,243
Thanks: 407
Thanked 284 Times in 201 Posts
bordercollie is on a distinguished road
Default

I replaced the cooling fan on my 2005 RTV900 with an aftermarket and saved a big wad. It cooled better than the oem too.. am thinking I may do the same to this 2011 model this summer. There is a thread about it on my favorite RTV forum ........ this forum., of course My sensors were all fine and just made sure to wire it for the proper rotation. collie
http://www.nettractortalk.com/forums...t=13665&page=3

Last edited by bordercollie; 01-20-2015 at 08:42 PM.
Reply With Quote
  #20  
Old 06-27-2015, 01:27 PM
Black'n'White Black'n'White is offline
Junior Member
 
Join Date: Jan 2012
Posts: 1
Thanks: 0
Thanked 1 Time in 1 Post
Black'n'White is on a distinguished road
Default

I was in the same boat as the OP. Fan worked when I applied 12V directly to it, but not when I grounded the pink wire to the coolant temperature sensor. When I looked at the schematic for the coolant temperature switch relay, I found that both the trigger lead and the power lead were fused.

Fuse 12 provides trigger current to the Coolant Temparature Switch Relay on a Red/Green wire. When the Coolant Temperature Switch gets hot enough it grounds the trigger coil in the relay, which closes the contacts to provide power to the fan.

Fuse 6 provides power to the fan motor through the Coolant Temperature Switch Relay on a Red/Blue wire.

Both fuses must be in place and working for the fan motor to operate.

With the ignition on, I wasn't getting any voltage on the Red/Green wire to the coolant temperature switch relay.

In the manual, fuse 12 is labeled as controlling a work light, which my RTV doesn't have. When another fuse blew, I pulled #12 and used it as I didn't have any fuses on hand. So the first time the RTV got hot enough to need the fan, it didn't come on and the temperature gauge went into the red. Replacing fuse 12 with a new one fixed the problem.

Hope this helps somebody else out there...
Reply With Quote
The Following User Says Thank You to Black'n'White For This Useful Post:
Cajunrotor (06-27-2015)
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



All times are GMT -5. The time now is 03:20 PM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Copyright 2002 - 2012, www.DotHQ.com