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.
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.
A53593-UN-08JAN04
Vacuum Meter Shown
A - Shear Pins
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 will shear when excessive load is put on drillshafts. Meter 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 chains, jammed or misaligned seed or chemical 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.
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