ASME B56.9 pdf download Safety Standard for Operator Controlled Industrial Tow Tractors 41.2 Part I contains broad safety standards applicable to tow tractor operation. Only authorizedoperators trained to adhere strictly to the operatinginstructions stated in Section 5 shall be permitted to operatc tow tractors.Unusual operating conditions may require additional safety precautions and special operatinginstructions. 4.2 Modifications, Nameplates，Marking,andCapacity 421 Modifications and...