Balancing M2 chopper
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=165957
Printed Date: 26 Sep 2025 at 12:44am
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Topic: Balancing M2 chopper
Posted By: OhKen
Subject: Balancing M2 chopper
Date Posted: 18 Nov 2019 at 10:24pm
| Put new bearings in the chopper . While we were there , we replaced the knives that had already been turned once and turned the ones that had not been turned . What made me scratch my head tho was the uneven number of knives . 2 rows had 8 knives and 1 row had 9 . How does that balance ? I assume on one end or the other , there is a counterweight to balance the odd knife . Can anybody shed light on how they balanced with that odd number ? |
Replies:
Posted By: Lonn
Date Posted: 19 Nov 2019 at 6:19am
|
You replace the knives in sets of 3 to keep it in balance. If you don't, you will shake it apart. I have never counted the knives on my L2 but the chopper was shook up pretty good and vibrated bad. I welded and reinforced and when I had a bad knife I replaced 3 knives as they went around no matter if the other knives looked good or not.... they have to be replaced in sets of 3....... smoothed it right out. ------------- -- --- .... .- -- -- .- -.. / .-- .- ... / .- / -- ..- .-. -.. . .-. .. -. --. / -.-. .... .. .-.. -.. / .-. .- .--. .. ... - Wink I am a Russian Bot |
Posted By: SteveM C/IL
Date Posted: 19 Nov 2019 at 6:31am
| Don't know what's going on there but should be 3 at every position. |
Posted By: FREEDGUY
Date Posted: 19 Nov 2019 at 6:35am
| If you replaced "some" of the knives with new and just "turned" others, the difference in weight of the knives alone will throw it out of balance I would think?? We replaced in sets of 3 also as Lonn said. |
Posted By: OhKen
Date Posted: 19 Nov 2019 at 9:02am
| Guys your missing or I'm á not doing a good job of explaining my point . Choppers have 3 rows of knives . That is why you always replace 1 in each row to keep it in balance. Knives always come in bags of 3 . Have replaced knives in L and F and never ran into this before . This chopper and I assume all M's are this way , It has 2 rows with 8 knives and 1 row with 9 knives . How did they get the chopper to balance with I row with an extra knife ? The chopper is balanced it runs smooth as silk . Dr Allis could you enlighten me ? |
Posted By: wekracer
Date Posted: 19 Nov 2019 at 9:53am
| I’ve never been around an M but I know The F and Ls have the same number on each row |
Posted By: DrAllis
Date Posted: 19 Nov 2019 at 9:59am
| Haven't done any chopper work in 20+ yrs. It is what it is. If it runs smooooooth no worries. |
Posted By: MACK
Date Posted: 19 Nov 2019 at 9:14pm
| I think the two rows with 8 have some weights in them. MACK |
Posted By: SteveM C/IL
Date Posted: 19 Nov 2019 at 9:25pm
| Well I'm confused. Parts book says use 9 sets of 3 to do complete replacement. Straight M series. First design M2 says use 11 sets....second design just says 3 hammers per set. Don't say how many sets to use. |
Posted By: FREEDGUY
Date Posted: 20 Nov 2019 at 5:10pm
I looked up his hammer # on the parts book and I found that the hammers are sold in 3's, but the bushings that go in them are a 25 pack ??
|
SteveM C/IL wrote:Posted By: OhKen
Date Posted: 21 Nov 2019 at 8:36am
| 1 row has an extra knife . All chopper knives are sold in 3's that is the way it has always been . It takes 25 knives and you must buy 27 . I'm going to go with Dr Allis's advice . I don't know how the Gleaner engineers got it to balance , but they did . It runs smooth as silk . Somewhere in the rotor there is provision to counter balance the odd knife . |
Posted By: MACK
Date Posted: 21 Nov 2019 at 8:21pm
| Like I said earlier, two rows have weights in them. MACK |