Posted by Jim Becker on September 14, 2010 at 12:08:13 from (173.57.154.186):
In Reply to: 990 Sickle Adjustment posted by Kerwin on September 14, 2010 at 09:30:14:
I assume the answer is the same as it is for the older mowers. If so:
First, you need to check for big parts that are bent (like the cutter bar itself). This usually isn't the problem.
The top of the ledger plates in the guards should all be in line through the length of the cutter bar. IH had a gauge that rested on top of the cutter bar and the ledger plate to check position. But you can usually get a good idea by sighting down the tops of the plates. Bend the guards to adjust.
If the guards are all in line and the knife sections are in good shape, you can then check clearance between the sections and ledgers. You adjust the clearance by bending the hold down clips. They are supposed to be adjusted with a hammer. Hit the front of the clip to bend it down. Hit the middle of the clip to bend it up. Most of the time, my aim with a hammer isn't good enough to have much luck doing that adjustment.
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