186 OPERATION PTO Classification Rear-mounted PTO units, for MACK transmissions, are categorized according to operation. Intermittent Service — The PTO unit is operated, under load, for less than seven minutes and then allowed to cool before it is operated again. Note: If a PTO unit is operated for less than seven minutes but is "not" allowed to cool down before operating again, it is considered in Continuous Service. Continuous Service — The PTO unit is operated, under load, for seven minutes or more. Note: Rear-mounted PTO units operating under the Continuous Service guideline must not be run at more than 70% of the PTO output-rated torque/horsepower.
Side-Mounted PTO Locations The first choice location for Side-Mounted PTOs is either of the PTO openings on the main box. The second choice, which is the compound PTO opening, is restricted to those applications specifically requiring multi-speed PTOs with reverse capability, such as some mechanical winches or unique speed or multiple PTO requirements. However, a word of caution is in order when using these locations. Operators should be trained to understand and follow the proper operating procedures as described in the cab instructions, and avoid using the neutralizing feature as a power disconnect for vehicle propulsion.
PTO Operating Procedures Specific PTO operating procedures are described at the end of applicable transmissions in the following section.
