NH Haybine Should the Sprocket drive-pins look like this?

Brett24 · May 22, 2017

I pulled the gearbox out of my New Holland 469. After removing the sprocket assembly from the shaft, the drive pins (I likely have the terminology wrong) were revealed . Of the four spring-loaded pins, two were in a position where they could engage the sprocket assembly. The other two were down where they would not.

Is this the way it is supposed to be?

The two that are down, are easily pushed in a little, and bounce right back to their starting point, so they are not stuck, and there is a spring behind them that is still working. I, however, expected all four to be fully out and able to help drive the sprockets.

Bret4207 · May 22, 2017

I don't think so. Probably rusted in place. Try some penetrating oil and tapping it. I had a similar thing on a baler and ended up drilling a hole from the back side and using a punch to loosen things up. I sealed the hole with caulking IIRC.

Northvale - PA · May 27, 2017

All four are spring loaded and should stick out. So, break them loose. Maybe the springs are shot. I had a 461 which only had 2 drive pins. The
469 has four which make it twice as strong. A basic mechanical improvement over the 461.

Brett24 · May 27, 2017

Thanks for the ideas.

I didn't realize those pins pulled out so easily. I used a magnet to pull the sunken ones out (they offered no resistance). The springs under them were in several pieces (photo attached).

I'll be replacing all four springs.

NH Haybine Should the Sprocket drive-pins look like this?

Brett24

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Bret4207

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Northvale - PA

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Brett24

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