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NH Knotter Question.

S

steve terplak

Member
Baler question. Older New Holland. 311. Sheared the pin that holds the twine disc shaft onto the pinion gear. Knotter manual refers to it as a “grooved pin”.
But parts diagram does not list it. It is #15 and 16 in diagram, no pin listed.

Why is it a “grooved pin”? From what I can tell hole in the gear and shaft are smooth.
Am I looking for a N.H. specific part here? Or can any solid pin work?
cvphoto53894.png


cvphoto53895.jpg
 
A common roll pin should work fine. You probably can find roll pins and grooved pins at most any rural hardware store, or NAPA.
 
Hi, a grooved pin would be a little stronger than a roll pin being solid. The name groove pin is due to the fact that it will have probably 3 flutes stamped into it along it’s length. These flutes increase the diameter slightly and deform when the pin is driven in. It is this deformation which holds the pin tight. They should only be used once.
DavidP,South Wales
 
That is the mystery. Still not sure what happened.
Broke first shear bolt of the season (flywheel). Heard tremendous bang. Needles were up.

Right knotter’s pin and clip Which hold knotter in position were MIA.

Our guess: pin fell out, knotter dropped out of position, threw it out of time. Pin sheared when disc attempted to rotate.

It is our best guess.
Never happened before.
Baler’s protective measures did their jobs.

Didn’t notice pin sheared until a 3rd attempt at timing twine disc failed (wouldn’t stay in time past 1 knot cycle). Sheared pin is 1 of 3 reasons knotter manual gives.
 
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