Replacing Shear Protection Pins

IMPORTANT: All shear protection pins should be replaced annually.

IMPORTANT: Replace shear pins ONLY with shear pin of the same size and type. Do not replace with other size or type of pin. Replacement countershaft shear pins (B) are located on the seed transmission frame.

NOTE: If drill shaft binds due to misalignment, loosen bolts on drill shaft bearings on planting units. Make certain shaft turns freely, then tighten bolts.

Shear protection pins (A) may become deformed through normal usage after extended use. In this condition, it is possible for the pins to eventually fail without a machine malfunction.

The shear pins (A), which connect counter shafts and transmission will shear when excessive load is put on drillshafts. Meter shear pins will shear when excessive load occurs in meter.

Infrequent or improper lubrication causes "binding" of moving parts within the machine. This "binding" can cause the shear pins to shear, thus preventing breakage of machine parts. Other common causes of binding include compaction of field residue on row unit drives, jammed or misaligned seed meters.

If either the left-hand and right-hand drive shear pin shears, turn the drill shaft by hand to locate where the "binding" is occurring. When the drill shaft can be turned freely by hand, replace the shear pin.

A-Shear Pins
B-Replacement Countershaft Pins

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