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Remember my 1970 XT fan
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captaindana View Drop Down
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Joined: 14 Sep 2009
Location: Fort Plain, NY
Points: 2559 		Post Options Post Options   Thanks (0) Thanks(0)   Quote captaindana Quote  Post ReplyReply Direct Link To This Post Topic: Remember my 1970 XT fan
    Posted: 10 Jul 2018 at 5:08am
Issue? Well I finally was home long enough to tear into it. Hopefully my picture of the fan will post. The fans mfg. date is stamped 3-10-70 and the tractor rolled off the line later that year. The image shows the failed blade AND the 12:00 and 5:00 blades are cracked clear through the rivets. This model has 3500 original hours.
Blue Skies and Tail Winds
                          Dana
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captaindana View Drop Down
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Joined: 14 Sep 2009
Location: Fort Plain, NY
Points: 2559 		Post Options Post Options   Thanks (0) Thanks(0)   Quote captaindana Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jul 2018 at 5:19am
Oh one more question.....the old fans blades were evenly spaced and the new fans blades are NOT. Why????
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                          Dana
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Lonn View Drop Down
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Joined: 16 Sep 2009
Location: Назарово,Russia
Points: 29805 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Lonn Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jul 2018 at 5:31am
Originally posted by captaindana captaindana wrote:

Oh one more question.....the old fans blades were evenly spaced and the new fans blades are NOT. Why????
To reduce noise
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CrestonM View Drop Down
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Joined: 08 Sep 2014
Location: Oklahoma
Points: 8455 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CrestonM Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jul 2018 at 9:05am
That's very interesting, Lonn. I didn't know that was the reason. I've seen both kinds and always wondered why there was a difference. 
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Joined: 11 Sep 2009
Location: wisconsin
Points: 34307 		Post Options Post Options   Thanks (0) Thanks(0)   Quote JC-WI Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jul 2018 at 9:15am
Thanks Captain Dana for sharing your troubles,
It might perk the interest of others to give their blades a look to see if they are having failure too and possibly prevent a Radiator disaster happening for them too.

  The 200 Allis got a 7 blade fan in them.
He who says there is no evil has already deceived himself
The truth is the truth, sugar coated or not. Trawler II says, "Remember that."
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Stan R View Drop Down
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Joined: 03 Dec 2009
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Points: 992 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Stan R Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jul 2018 at 10:11am
less harmonic noise = less vibration
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Joined: 19 Aug 2012
Location: central IL
Points: 3530 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AC7060IL Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jul 2018 at 11:20am
Is this the tractor that it's 301 lost an injector tip into a cylinder? If so, and operator at the that time ran it too long, then wonder if that engine miss could have imbalanced things enough to cause this issue?? But maybe the harmonic crank pulley & fan blade belt would have softened any radical torquing to fan? Just thinking...
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Lonn View Drop Down
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Joined: 16 Sep 2009
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Points: 29805 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Lonn Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jul 2018 at 11:39am
Look at alternators. The little fan on many of them are not equal all the way around for noise purposes. I never thought of the vibration factor.
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hillmonkey View Drop Down
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Joined: 03 Apr 2010
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Points: 417 		Post Options Post Options   Thanks (0) Thanks(0)   Quote hillmonkey Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jul 2018 at 5:05pm
blades are off set for easier bolt access thu the one wide space.
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Lonn View Drop Down
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Joined: 16 Sep 2009
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Points: 29805 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Lonn Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jul 2018 at 5:09pm
Originally posted by hillmonkey hillmonkey wrote:

blades are off set for easier bolt access thu the one wide space.
That's just a side effect. The reason was for harmonic noise reduction.
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Joined: 19 Jan 2010
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Points: 11743 		Post Options Post Options   Thanks (0) Thanks(0)   Quote TramwayGuy Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jul 2018 at 5:43pm
I agree with Lonn. Making the blades uneven somewhat cancels out frequencies to amplify by generating multiple frequencies that are not a complement of each other.
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Joined: 18 Sep 2009
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Points: 1922 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DanWi Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jul 2018 at 9:40pm
So how bad did the radiator get skinned?
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Joined: 12 Sep 2009
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Points: 8613 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jul 2018 at 9:47pm
my 220 HAS one of those aluminium fans.....got me wondering. ...better have a look see.
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Mikez View Drop Down
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Interesting. How long have the tractor
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Joined: 14 Sep 2009
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Points: 2559 		Post Options Post Options   Thanks (0) Thanks(0)   Quote captaindana Quote  Post ReplyReply Direct Link To This Post Posted: 11 Jul 2018 at 5:16am
Hi guys I put a new fan assembly and radiator in the XT yesterday and headed out to bale 90 of new seeding. It does seem quieter. I will take the dinged 2 year old radiator to the shop and see if it can be repaired. If it can be repaired I'll have to sell it or buy another XT.😆
Blue Skies and Tail Winds
                          Dana
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Lonn View Drop Down
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Joined: 16 Sep 2009
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Points: 29805 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Lonn Quote  Post ReplyReply Direct Link To This Post Posted: 11 Jul 2018 at 5:25am
Originally posted by TramwayGuy TramwayGuy wrote:

I agree with Lonn. Making the blades uneven somewhat cancels out frequencies to amplify by generating multiple frequencies that are not a complement of each other.
I gotta look out the winder to check for flyin pigs. ShockedWink
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Joined: 31 Aug 2012
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Points: 12160 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tbone95 Quote  Post ReplyReply Direct Link To This Post Posted: 11 Jul 2018 at 10:40am
I remember waaaayyy back in the catacombs of knowledge, steel can be designed for very long fatigue life against repetitive load cycling and vibration.  You can basically design it to a point that says essentially if it lives this long, it's going to live, until an irregularity or impurity causes a crack.
 
Aluminum there is no such number, you can keep designing it longer, but there's no "plateau" so to speak like there is for steel. 
 
Interesting.  Admittedly, I don't know how that applies exactly to the situation, but interesting.
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Joined: 29 Nov 2010
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Points: 4053 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Orange Blood Quote  Post ReplyReply Direct Link To This Post Posted: 12 Jul 2018 at 8:42am
I got to ask Cap'n, any good pre-flight would have caught those cracks in the prop, are ya slippin' ?  LOL 
Still in use:
HD7 WC C CA WD 2-WD45 WD45LP WD45D D14 3-D17 D17LP 2-D19D D19LP 190XTD 190XTLP 720 D21 220 7020 7030 7040 7045 3-7060
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Ed (Ont) View Drop Down
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Joined: 08 Nov 2009
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Points: 1488 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ed (Ont) Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jul 2018 at 7:32am
This may be dumb but I was wondering if some of these aftermarket automotive fan blades would work as replacements. Stainless steel blades- come with different numbers of blades and you can choose different diameters. They sure move a lot of air at low rpm. They flatten out at higher rpm which would be insignificant on tractor application. Any thoughts??? 
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Lonn View Drop Down
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Points: 29805 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Lonn Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jul 2018 at 7:49am
Isn't stainless steel a little brittle if you are trying to find a fan that won't crack apart?
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Ed (Ont) View Drop Down
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Joined: 08 Nov 2009
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Points: 1488 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ed (Ont) Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jul 2018 at 8:03am
Don't know the answer to that Lonn. I do know they work extremely well on the hot rod stuff. Some of them are good to 10,000 rpm. I've not seen an issue with them - yet. LOL
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