SP25 carriage gear adjustment

I have a problem with the large power carriage motor gear touching the edge of the carriage. Not sure I’m using the correct terminology but I have attached a photo. I had this problem once before and was able to correct it but now I can’t remember what I did.  (I took off the cap on the gear to take a look inside which is why it is missing in the photo).

How do I make an adjustment to back the gear away? Anyone know? TIA

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The Arm NYC
1 year ago

I see now that you stated that you removed the parts I mention in my last reply.

Find the allen head set screw in the F-971 clutch tensioning collar and loosen it.

Use a pin or the end of a small allen wrench to back off that collar in the direction of the motor. It is okay to go nice and far.

Put back the parts you had removed on the end of the clutch and make sure it is well tightened and the clutch is seated correctly.

Re-tension the clutch collar. You want it to be set tight enough that it will go without slipping over a form, but it should slip if it hits something over type high.


The Arm NYC
1 year ago

You appear to be missing the flat plate and allen head screw that compresses the unit and keeps it in place. F-921 in Paul’s schematic there.


Paul Moxon, Moderator

See the threaded hole on the mounting bracket and back out the set screw. There may be another one on the opposite side. You should then be able to push the gear and clutch toward the motor. Retighten the set screw.

Paul Moxon, Moderator

Is there a screw in the cap? If so, check that the threads are not stripped.
Is the gap between the gear and the clutch greater than in the attached image? You may be able to tap the gear toward the clutch and retighten.

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