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Jim, The former owner of my 270 had the same complaint. I must have cleaned out 50 broken shear bolts from the tool box. As previously mentioned, check the knotter brake. Mine was coated with grease and would not hold the needles in the home position, causing the safety latch dog to engage. To check the timing, I would first check the plunger to feeder tine timing. Rotate the flywheel in the direction of the arrow until the plunger crank arm is vertical and is located between the marks located in the top of the bale chamber. Then, remove the rear cover and check to see that the feeder tine bar pivot point (where the grease fitting is located) is located between the two marks stamped in the framework of the feeder. To re-time, remove the master link from the feeder drive chain (which is located under the L.H. chain cover closest to the flywheel), line up all the marks and reinstall the chain. Now the feeder and plunger are timed. Next, check the needle/knotter drive timing. The timing is correct if the needles just begin to enter the bale chamber when the tips of the projections on the face of the plunger have passed the points of the needles by 1/4" to 3/4". Manuals are available from CNH Publications. Their number is: (800) 635-4913. I hope this is helpful to you. Good luck,
Scott
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