disk timing on New Holland H7220 Diskbine

Andy C · Apr 14, 2020

I was changing blades on a customers New Holland H7220 Diskbine. Looking towards the back of the mower I started on my left and proceeded to change blades. All went well until I got to the last two disks. There was interference of the blades. It appeared the last disk was out of time. removal showed that this disk is solid splined versus the others which are only partially splined to allow a shear if rock or other obstruction is hit. The owners manual does not sat a procedure for timing disks. Has anyone here re-timed the disks on this style mower? I don't really understand what is going on as none of the shear disks are sheared and only the last one (the drive disk) seems out of time. any ideas or details on timing disks would be appreciated
Thanks,
Andy

Alvin 41 · Apr 14, 2020

Turtles (knife holders) have to be 90 degrees apart. You will have to move the drive hub to correct spline alignment.

Alvin 41 · Apr 14, 2020

Reason for being out of time could be that drive shaft spline between gearboxes is failing under load .

dcarp · Apr 14, 2020

Check out these.

dcarp · Apr 15, 2020

Sorry about the orientation of the pictures, IPhone went crazy last night.

Andy C · Apr 15, 2020

Thank you all for the comments. We got it right by starting from the drive end and timing the hubs using the vent holes as indicators. Using the probable four positions of the hub to fine tune the position is a slick setup!
Andy

disk timing on New Holland H7220 Diskbine

Andy C

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Alvin 41

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Alvin 41

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dcarp

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dcarp

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Andy C

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