Posted by Hugh MacKay on October 07, 2008 at 06:21:41 from (209.226.247.1):
In Reply to: What size disc? posted by Derrick In NY on October 07, 2008 at 05:32:36:
Derrick: There are several factors to consider, and I never look at disks from a view point of total width of cut. Size of blades and blade spacing are a major factor. If the disk is mounted on a Super A then you also must consider what Super A will lift. You also don't say whether your looking at single gang or tandem disk. In a 5' or 6' disk, tandem is the only way to go. Small single gang disks have a tendancy to create burms.
Here has been my experience with mounted tandem disks behind these little tractors. I first had a 16 blade, 7.5" spacing and 16" blades. SA and 130 handled it easily, lifted it easily, however the downfall, it did not cut full width of tractor.
Next I went to a 24 blade disk, 7.5" spacing and 18" blades. With this larger disk, 130 and 140 run out of traction quite easily. It also taxes the hydraulic system to the limit lifting the larger disk. I have no problem getting this large disk to cut axle deep. I am considering removing one blade from each axle giving me 20 blades. I hesitate to do that as my disk has quite a heavy frame, thus I'm not sure 4 blades, 4 spacers and 30" of gang bolt will reduce the weight as much as I would like for lifting. Then I might just buy a heavier tractor.
I've come to believe the best mounted tandem disk would be a 20 blade, 7.5" spacing and 16" blades. I'd look for one with 1-1/4" arbor, as the larger bearings, spacers and bearings add a lot of weight. Such a disk will cut about 68" width, nicely covering tractor wheel tracks, as long as tractor is set 56" tread or narrower. I run my tractors on 52" wheel tread. I think a 20 blade, 16" blade disk would be the right combination for the Super A.
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