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Case Tractors Discussion Forum
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Backwards fan ?

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Bill in Wiscons

10-28-2005 19:12:38




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I just changed the fan belt on my brother in laws 350 Case crawler and noticed when I got it done that the fan blows through the front of the radiator. I've worked on alot of tractors in my time and never seen this before. Could someone have put the wrong fan blades on before I worked on it?




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Can't even use my name

10-31-2005 11:40:47




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 You can't turn the fan in reply to Bill in Wisconsin, 10-28-2005 19:12:38  
Ya'll can't just turn the fan and one way it blows air and the other way it sucks air. No matter how you put it on the fan will still move air the same direction.



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Roger (Mi)

11-02-2005 05:36:54




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 Re: Specially made pull/push fan in reply to Can't even use my name, 10-31-2005 11:40:47  
You're right about a fixed blade fan. My Case 1150 dozer has a fan that will either push or pull. Simply push each blade in one inch, turn the blade to pull or push, and release.



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Can't even use my name

11-02-2005 18:21:03




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 Re: Specially made pull/push fan in reply to Roger (Mi), 11-02-2005 05:36:54  
Well ya have me there. I have seen ads for fans the automatically change blade pitch according to cooling requirements. Need less air movement and they go almost flat to reduce the power needed to spin them. They opened up to pull more air and every so often reversed the air flow to clean the radiator out! Never actually saw one though, one of those ideas that really makes sense but in the real world doesn't work I guess.

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Case man2

10-29-2005 07:12:00




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 Re: Backwards fan ? in reply to Bill in Wisconsin, 10-28-2005 19:12:38  
The main reason for the backward fan was, that most dozers are used to push dirt, this creates a lot of dirt coming back on the radiator. When the fan is sucking through the radiator the dirt and sand will erode the fins and tubes in a very short time.



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chiefrider

10-31-2005 17:40:03




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 Re: Backwards fan ? in reply to Case man2, 10-29-2005 07:12:00  
As for fans blowing one way.I put mine on backward once by mistake.It didn't move air like it was suppose to.You couldn't feel air moving very well.



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DJM75

10-29-2005 05:43:15




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 Re: Backwards fan ? in reply to Bill in Wisconsin, 10-28-2005 19:12:38  
A couple of guys here are right it is to keep the radiator clean farmall had it many years ago as an option as I"m sure some others had.



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South Texas Case

10-28-2005 20:38:22




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 Re: Backwards fan ? in reply to Bill in Wisconsin, 10-28-2005 19:12:38  
It's called a pusher fan down here. They are used on dozers to blow leaves and trash out away from the radiator to help keep the radiator cleaner. With a regular fan on a tractor pushing mesquite you might have to blow the radiator out several times a day. Tony



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Doc Larry

10-28-2005 19:45:03




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 Re: Backwards fan ? in reply to Bill in Wisconsin, 10-28-2005 19:12:38  
I don"t know about Case but many Cat crawlers have a reversible fan that can be set to blow either direction.

Larry



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Bill in Wisconsin

10-28-2005 19:54:41




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 Re: Backwards fan ? in reply to Doc Larry, 10-28-2005 19:45:03  
This fan is rigid, not adjustable, as long as it isn't going to hurt anything I'm gonna leave it alone. I'll just tell the bro-in-law his crawler doesn't suck, it blows. I'm a J.D. man myself.



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Wisconsin Bill

10-28-2005 21:09:48




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 Re: Backwards fan ? in reply to Bill in Wisconsin, 10-28-2005 19:54:41  
Case, being made in Wisconsin was aware of operator comfort when machines were used in freezing weather and also in the near 100 degrees of summer. That and the fact, your Case probably does not have a heated/air conditioned cab. Turn the blade to push in the winter to cool the engine and not roast the operator. Then turn the fan around to pull the heat back to the operator in the winter. Yea sure, but remember the point in time, no cab, etc. It did and still does make a difference!

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Doc Larry

10-29-2005 04:48:19




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 Re: Backwards fan ? in reply to Wisconsin Bill, 10-28-2005 21:09:48  
Which is exactly what we did in Colorado. In the winter we put canvas skirts on the engine and the fan blew hot air on the operator to keep warm. In the summer, reversed the fan and blew the hot air out the front. That first 20 minutes or so in the winter was a bit cold, though....

Larry



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