A high lift rider truck may be operated without the guard, providing all of the following conditions are met:
1. Vertical movement of the lifting mechanism is restricted to seventy-two inches (1800 mm) or less from the ground.
2. The high lift rider truck will operate only in an area where:
a. The top of a tiered load will not be more than one hundred twenty inches (3000 mm) high.
b. The bottom of a tiered load will not be more than seventy-two inches (1800 mm) high.
c. Only stable loads are handled.
d. The operator is protected from objects falling from high stack areas.
The overhead guard is not intended to withstand the impact of a maximum capacity load of the PIT.