This question is asked often. A 1hp, 3hp; 5hp etc. power unit will all raise a dock lift of any capacity. The reason for increasing the horsepower rating is related to the lifting speed. As the lifting capacity gets increased, additional lift cylinders are required to lift the extra weight.
To fill the lift cylinders in a time that is acceptable to raise the dock lift, the volume of oil being pumped to the lift cylinders is increased. This requires a larger volume pump. To operate the larger volume pump, a higher horsepower rated motor is required.
The ideal lifting speed is in the range of 10’-12’ per minute, based on the dock lift capacity. Power units are sized to meet this target speed.
Contact a Pentalift Sales Representative for more information.