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Air conditioning belt keeps jumping off?
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Ron(AB) View Drop Down
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Joined: 27 Dec 2009
Location: Alberta
Points: 959 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ron(AB) Quote  Post ReplyReply Direct Link To This Post Topic: Air conditioning belt keeps jumping off?
    Posted: 14 May 2016 at 10:40pm
I've put the air on the last two days while doin' fieldwork, and each day the belt jumps off. This is on a 8070 with the old style gm compressor.

First time the belt went into the fan, got a few bites taken out, and then got spit out.

Second time, it jumped onto the alternator belt, sort of, and wore both belts before I noticed.

Two belts junk!

The ac does work good when the belt stays on properly… Its the weekend, and I need new belts, and I have field work to do in hot weather - 70 above F.

What's causing this?
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MACK View Drop Down
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Joined: 17 Nov 2009
Points: 7664 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MACK Quote  Post ReplyReply Direct Link To This Post Posted: 14 May 2016 at 10:52pm
Replace the fluid damper  on front of crankshaft.       MACK
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 21723 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2016 at 6:57am
X-2 !! get that fluid dampner replaced before it breaks the crankshaft !!
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jkoby View Drop Down
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Joined: 26 Aug 2014
Location: New Castle, IN
Points: 179 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jkoby Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2016 at 8:55am
Without ac, wouldn't you have more power? More power means moving a little faster? Faster speed means more wind? Open the windows and feel the breeze!

Some of us don't have ac!
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SteveM C/IL View Drop Down
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Joined: 12 Sep 2009
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Points: 8565 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2016 at 9:33am
Doc and MACK agree with me
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littlemarv View Drop Down
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Joined: 10 Jun 2013
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Points: 1834 		Post Options Post Options   Thanks (0) Thanks(0)   Quote littlemarv Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2016 at 9:37am
How does a damper throw a belt?
The mechanic always wins.

B91131, WC23065, WD89101, CA29479, B1, Early B10, HB212, 416H
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DrAllis View Drop Down
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Joined: 12 Sep 2009
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Because it isn't working. Too many harmonics going on making the belt act like a guitar string twanging.
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Leon B MO View Drop Down
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Joined: 12 Sep 2009
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Points: 2181 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Leon B MO Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2016 at 12:03pm
This is info that I need to store somewhere in the back of my head. I would have never came to the conclusion that an 8070 throwing the AC belt is due to a bad dampener. The information available here never ceases to amaze me.
Leon B 
Uncle always said "Fill the back of the shovel and the front will take care of itself".
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 21723 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2016 at 12:53pm
7080-7580-N5/N6- 8070- 4W220
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Ron(AB) View Drop Down
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Joined: 27 Dec 2009
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Points: 959 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ron(AB) Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2016 at 2:16pm
Thanks everybody.

The tractor is parked in the shed until the damper is replaced.

Now I just have to get a new one and figure out how to get the old one off….?
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Lynn Marshall View Drop Down
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Joined: 13 Sep 2009
Location: Dana, Iowa
Points: 2362 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Lynn Marshall Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2016 at 3:32pm
The dampener is not the pulley.  The pulley is solid on those models. The dampener just bolts to the pulley with 6  7/16 capscrews. Easy as pie, except the part where you have to pay for it.
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tbran View Drop Down
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Joined: 14 Sep 2009
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Points: 3510 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tbran Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2016 at 8:37pm
when we have this we also check to see that liquid Freon is not getting to the compressor and locking it up - replacing the expansion valve and drier usually fixed.
When told "it's not the money,it's the principle", remember, it's always the money..
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SteveM C/IL View Drop Down
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Joined: 12 Sep 2009
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Points: 8565 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2016 at 9:52pm
Good point Tim....for others,it's not just viscous dampers that go bad.If the rubber ring gets bad on those without a viscous damper you end up with BAD harmonics there too. My uncle's 190 was wrecking alternators and throwing belts before he noticed the ring wobbling some.
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Ron(AB) View Drop Down
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Joined: 27 Dec 2009
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Points: 959 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ron(AB) Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2016 at 1:49pm
Ouch!

$1680.00 Can to replace…

Ahhhh but we love allis tractors…

Orange is a beautiful colour…..
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Stan IL&TN View Drop Down
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Joined: 13 Sep 2009
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Points: 6730 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Stan IL&TN Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2016 at 2:47pm
I'd want to make darn sure the old one was bad before writing that check.
1957 WD45 dad's first AC

1968 one-seventy

1956 F40 Ferguson
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DougS View Drop Down
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Joined: 03 Nov 2011
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Originally posted by Ron(AB) Ron(AB) wrote:

Ouch!

$1680.00 Can to replace…

Ahhhh but we love allis tractors…

Orange is a beautiful colour…..

There is a thread lurking here in the archives where getting the damper rebuilt by a guy in Salem, Oregon was discussed. He was able to do it for a fraction of the cost.

ETA: Here's the thread:

http://www.allischalmers.com/forum/forum_posts.asp?TID=96740&KW=damper&PID=844184&title=426-harmonic-balancer-dampner-front-pulley#844184

Edited by DougS - 16 May 2016 at 3:50pm
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 21723 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2016 at 4:39pm
That's for the rubber mounted style, not the viscous style.
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SteveM C/IL View Drop Down
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Joined: 12 Sep 2009
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Points: 8565 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2016 at 5:42pm
I assume viscous dampers are sized to the engine ie displacement and or stroke etc. The ones on my class eight trucks are much larger than my 8070.I just remembered my 6-71 Detroit had a pretty lrge one and it was 426 two stroke.
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randy View Drop Down
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Joined: 12 Sep 2009
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Points: 1217 		Post Options Post Options   Thanks (0) Thanks(0)   Quote randy Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2016 at 6:27pm
I am going to guess that if you price one for a Deere or a Caseih they are quite pricey also!
CA WD WD45 D17 D17 Diesel 7060 8050 8070
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SteveM C/IL View Drop Down
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Joined: 12 Sep 2009
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Points: 8565 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2016 at 10:11pm
Can you purchase direct from Fluidamper?
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LeonR2013 View Drop Down
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Joined: 01 Jan 2013
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Points: 3500 		Post Options Post Options   Thanks (0) Thanks(0)   Quote LeonR2013 Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2016 at 10:12pm
You can check the damper with a mic. Just polish the damper on four points and see what the measurement is. When the viscous material starts to harden then the very thin metal on the front starts to bulge as the viscous starts to gang up on one side. You should have been getting a vibration by this time. I personally wouldn't even start it again until it's fixed. Leon R  Cmo
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