80R knife head.
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=125447
Printed Date: 22 Sep 2025 at 9:10pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 80R knife head.
Posted By: JohnH123
Subject: 80R knife head.
Date Posted: 05 Jul 2016 at 11:55am
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Hello, folks! I have a model 80R (i think) sickle mower. I broke the knife head a few years ago and the mower has sat ever since. It broke while mowing and it was welded back together. It broke again putting the knifehead back on the cutterbar. I'm trying to get it running again as a summer project and I need a new knife head. does anyone know a good place to get parts from? I also need a belt and tail wheel. one other question I have is what is the best travel speed? I had it running on the 4510 at full throttle going at about 2 MPH. any faster and it will ball up the mower. any advice? Thanks for the help! ------------- Ignorance is curable- stupidity is not. ~427435 |
Replies:
Posted By: SteveM C/IL
Date Posted: 05 Jul 2016 at 12:58pm
| don't quote me but I'd bet it should be run at 540 pto speed,not wide open....might have something to do with the broken head |
Posted By: Allis dave
Date Posted: 05 Jul 2016 at 1:08pm
| When we mowed hay with sickle bar haybines we always ran about 1700 rpm which is probably like 450 on the PTO? Maybe we could've ran faster, but it was Grandpa's haybine and that's what he said to do. It's worked well, and I don't think speeding up really helped any. |
Posted By: JohnH123
Date Posted: 05 Jul 2016 at 1:55pm
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One more question; where is the model # located? I still need to confirm it is an 80R. thanks!! ------------- Ignorance is curable- stupidity is not. ~427435 |
Posted By: Mikez
Date Posted: 05 Jul 2016 at 10:22pm
| Show us a picture. We can tell you |
Posted By: DennisA (IL)
Date Posted: 05 Jul 2016 at 10:33pm
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The head breaks because something else is wrong. Check all of the bearings in the connecting arms. ------------- Thanks & God Bless Dennis |
Posted By: MACK
Date Posted: 06 Jul 2016 at 7:26am
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I should have a good used one. Too many RPMs, dull knife, worn out ledger plates, improper adjusted ware plates, improper adjusted hold downs, and speed cause brokerage. MACK
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Posted By: Clay
Date Posted: 06 Jul 2016 at 7:32am
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Try Webb's Sickle Service http://www.sickleservice.com/parts/knifeheads/450-141.html" rel="nofollow - http://www.sickleservice.com/parts/knifeheads/450-141.html
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Posted By: wekracer
Date Posted: 06 Jul 2016 at 10:51am
| I second a bad bearing. Dad always said a bearing going out would snap the head off. Also agree with Mack. You should be able to run 4-5 mph at 3/4 throttle. |
Posted By: JohnH123
Date Posted: 06 Jul 2016 at 12:00pm
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can you elaborate on which bearings? ps. I'm going to go get some pics right away. hang on a minute. ------------- Ignorance is curable- stupidity is not. ~427435 |
Posted By: wekracer
Date Posted: 06 Jul 2016 at 1:10pm
| Connecting rod bearings. They need to be in good shape |
Posted By: JohnH123
Date Posted: 06 Jul 2016 at 2:12pm
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whats the best way to check them? ------------- Ignorance is curable- stupidity is not. ~427435 |
Posted By: Auntwayne
Date Posted: 06 Jul 2016 at 2:25pm
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Our 80R was completely rebuilt by dad before he died, so it is in really nice (new) condition. I never run more than 1/3 throttle as it never needs more no matter how thick /tall whatever I am mowing. Anything more sounds as if the sickle bar would fly off. ------------- Dad always said," If you have one boy, you have a man. If you have two boys, you have two boys". "ALLIS EXPRESS" |
Posted By: orangereborn
Date Posted: 06 Jul 2016 at 2:42pm
Orangereborn 964?? 192nd Ave New Richmond, WI 54017 715-247-3079 715-781-2055 mailto:Orangereborn@hotmail.com" rel="nofollow - - Orangereborn@hotmail.com |
JohnH123 wrote:Posted By: Gary Burnett
Date Posted: 06 Jul 2016 at 3:00pm
If you can shake the cross arms up and down much at all the bearings are worn.Also the original cast sickle heads break easy anyway the ones from Webbs Sickle Service are much stronger.The sickles on AC Twin Wheel Drive mowers need to be kept very sharp if not you're going to have problems.Also those mowers can't take running the PTO at 540 RPM I can tell you that from personal experience. |
Posted By: JohnH123
Date Posted: 06 Jul 2016 at 5:22pm
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"Is the sickle head connection smooth or serrated? Dale" serrated. @gary there is quite a bit of slop in the connecting rods. I see new bearings in my future. I do have some pics but it won't let me upload. I'll try uploading to a different sit and linking it here ------------- Ignorance is curable- stupidity is not. ~427435 |
Posted By: CTuckerNWIL
Date Posted: 06 Jul 2016 at 7:09pm
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In all the years we mowed hay with a sickle mower no one every ran more than half throttle to mow. Proper set up with sharp edges makes for a LOT easier mowing, not fighting the thing all day. ------------- http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF |
Posted By: Gary Burnett
Date Posted: 06 Jul 2016 at 8:31pm
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The large rear bearing on the gearbox are pretty cheap and can be found easily the bearings on the cross arms are aircraft bearings and last i priced were around $70 each. |
Posted By: tractorboy
Date Posted: 06 Jul 2016 at 9:46pm
| My 80-r cut really nice this spring, after new sections from webbs! I was never more than 2/3 throttle on my WD-45. |
Posted By: HudCo
Date Posted: 07 Jul 2016 at 3:19pm
| ours is ran at 2/3 throttle max thats only to pick up a little ground speed in alfalfa. mower runs the best at about half throttle . key thing good ledgerplates and clips and sharp sections, and a pump of grease in the cross arm bearings every couple hours . second or third gear with the wd depending on grass or alfalfa with that being said it will do a job that looks like you went in a done it with your lawn mower |
Posted By: JohnH123
Date Posted: 08 Jul 2016 at 6:21pm
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OK, I got pics. http://www.greentractortalk.com/forums/implements-attachments/70193-help-me-identify-sickle-mower.html#post1028513 please ignore the first two or three responses. they were created as a result of technical difficulties. ------------- Ignorance is curable- stupidity is not. ~427435 |
Posted By: JohnH123
Date Posted: 12 Jul 2016 at 4:36pm
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quick question on bearings. if I extract the old ones, could I maybe run them over to napa or grainger and get replacements? Or would I have to track down some new ones fromsomewhere else? ------------- Ignorance is curable- stupidity is not. ~427435 |