*NOTES: The motor pulley supplied with a 2-step pulley. The small step to be used for bins 30-feet {9.144m} in diameter and smaller. The large step is for bins larger than 30-feet {9.144m} in diameter.
Model SP4 and SP4S
Model SP4 spreads bin diameters of 37-feet to 60-feet {11.28m to 18.29m}
Model SP4S spreads bin diameters of 36-fee6t {10.97m} or less