Balancing M2 chopper

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 ?

Don't know what's going on there but should be 3 at every position.

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 ?

Haven't done any chopper work in 20+ yrs. It is what it is. If it runs smooooooth no worries.

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.

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 .