Note: When turning the drive system by hand to check for binding, be sure to rotate all drill shafts in their normal direction of rotation. Compare the torque values required to drive given sections of the machine against similar sections on the opposite side.

Shear pins can become deformed after extended use. In this condition, it is possible for the shear pin to fail without a machine malfunction. Replace all shear pins annually.

Verify that drives can be turned by hand before replacing pin and resuming planting.

Common causes for binding include the following:

Improper care and lubrication of drive components and meters.

Debris caught in row unit chains.

Jammed chemical or seed meters.

For shear pin locations on this machine see REPLACE SHEAR PROTECTION PINS in Service and Adjustments section.

Half width disconnect failure due to overload.

Inspect half width clutch and repair as needed.

Inspect chains, sprockets, and idlers within the transmission. Repair, align, or replace as necessary.

Poor maintenance of row unit drives and meters.

Perform maintenance on seed and chemical meters and the components that drive them.

Improper contact drive tire adjustment.

Adjust contact drive tire to proper specification. See ADJUST SEED AND FERTILIZER TRANSMISSION WHEEL ENGAGEMENT POINT in Service and Adjustments section.

Build-up of mud and residue around transmission engagement tire.

Remove obstructions from around contact drive tire and proceed. If the machine is not equipped with mud scrapers on the chassis tire which drives the transmission tire, consider seeing your John Deere dealer about obtaining one.

Excessive down force setting on row units.

Decrease row unit down force.

Note: When drive couplers become excessively worn, the left-hand and right-hand couplers can be exchanged to provide new wear surfaces.

Examine chains, sprockets, and idlers associated with failing section of the machine and fix, align, or replace as necessary. For proper drive coupler alignment, see ADJUST METER CHAIN DRIVE in Service and Adjustments section.

Failed or disconnected Pro-Shaft™ drive.

Reconnect, or replace PRO-SHAFT drive as necessary. For proper drive coupler alignment, see ADJUST METER PRO-SHAFT DRIVE in Service and Adjustments section.

NOTE: While adjusting flex shaft, be sure that drive couplers are properly aligned.

Flex shaft must slide back and forth freely on level ground. Shaft slides approximately 9 mm (0.34 in.), or full length of the slots in the flex shaft ends. This movement allows for telescoping to occur as the machine travels over uneven terrain. If the cover of the flex shaft has been cut, torn, or worn through, replace it. See ADJUST DRILLSHAFT COUPLERS AND FLEX SHAFTS in Service and Adjustments section.

Binding between ends of the flex shaft and drill shaft it connects.

NOTE: While adjusting flex shaft, be sure that drive couplers are properly aligned.

Clean and lubricate the junction between the flex shaft and the drill shaft ends to which it is connected then reinstall and adjust. See ADJUST DRILL SHAFT COUPLERS AND FLEX SHAFT in Service and Adjustments section.

OUO6435,0001EF0-19-20090526