A system for a pallet truck load wheel mechanism, the system comprising: a logic device comprising a processor; a first sensor arrangement secured to the pallet truck on a first side of the load wheel mechanism and operatively connected to the logic device ; a second sensor arrangement secured to the pallet truck on a second side of the load wheel mechanism and operatively connected to the logic device ; wherein the first sensor arrangement includes a first sensing field that defines a first edge of an operability window ; wherein the second sensor arrangement includes a second sensing field that defines a second edge of the operability window ; wherein the logic device has an operable state indicating that the load wheel mechanism can raise a pallet lifting device and an inoperable state indicating that the load wheel mechanism should not raise the pallet lifting device; wherein the logic device is initialized in the operable state; wherein the logic device is configured to change to the inoperable state in response to each time the first sensor arrangement detects an edge of a board intersecting the first edge of the operability window ; wherein the logic device is further configured to change to the operable state in response to each time the second sensor arrangement detects an edge of a board intersecting the second edge of the operability window ; characterized in that , the logic device comprises a counter; wherein the logic device is further configured to change to the inoperable state by incrementing the counter; wherein the logic device is further configured to change to the operable state by decrementing the counter; and wherein the logic device indicates an operable state for the load wheel mechanism to raise a pallet lifting device occurs when the counter equals zero. a logic device comprising a processor; a first sensor arrangement secured to the pallet truck on a first side of the load wheel mechanism and operatively connected to the logic device ; a second sensor arrangement secured to the pallet truck on a second side of the load wheel mechanism and operatively connected to the logic device ; wherein the first sensor arrangement includes a first sensing field that defines a first edge of an operability window ; wherein the second sensor arrangement includes a second sensing field that defines a second edge of the operability window ; wherein the logic device has an operable state indicating that the load wheel mechanism can raise a pallet lifting device and an inoperable state indicating that the load wheel mechanism should not raise the pallet lifting device; wherein the logic device is initialized in the operable state; wherein the logic device is configured to change to the inoperable state in response to each time the first sensor arrangement detects an edge of a board intersecting the first edge of the operability window ; wherein the logic device is further configured to change to the operable state in response to each time the second sensor arrangement detects an edge of a board intersecting the second edge of the operability window ; characterized in that , the logic device comprises a counter; wherein the logic device is further configured to change to the inoperable state by incrementing the counter; wherein the logic device is further configured to change to the operable state by decrementing the counter; and wherein the logic device indicates an operable state for the load wheel mechanism to raise a pallet lifting device occurs when the counter equals zero. <EOS>