Pentalift Blog - Hydraulic levellers

What Are the Benefits of Interlocking Overhead Doors to Loading Dock Equipment?

If you have both a hydraulic dock leveler and an overhead door in the closed position and try to operate the dock leveler, the power of the dock leveler will damage the locked overhead door. If you have a vertical storing dock leveler in the rest (vertical) position and try and operate (lower) it when an overhead door is in the closed position, the dock will cause severe damage by impacting with the overhead door. In order to ensure that the dock leveler will not be able to operate when the overhead is in the closed position, you can equip the overhead door with an electronic interlock switch. Pit installed dock levelers or vertical storing dock levelers will only work if the overhead door is open.

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Why Are There So Many Horse Power Ratings For Lift Tables?

The reason lift tables have various horse power ratings is strictly to achieve typical speeds of vertical travel. The quicker the oil can be pumped into a cylinder, the quicker the cylinder extends, increasing the lift speed. Generally, the higher the capacity of the lift table, the more cylinders the lift table will require. In order to maintain typical lift speeds of 10 – 12 feet per minute, a higher rated power unit is used to achieve these speeds.

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Why Is There a Choice to Have Self-Contained or Remote Power Units for Dock Levelers?

Self-contained power units cost less and are the most common, however, there are alternatives. Remote power units are one of the alternatives and are best suited for wash down applications. When periodic maintenance is required, it is easier to access a remote power unit. At the time of installation, remote power units are typically installed 7’ – 8’above finished floor level on a wall mounting bracket. This moves the power unit up and away from potential impact. The hydraulic hoses are then run from the remote power unit to the dock leveler cylinder. Often the application determines the decision to go to a self-contained power unit or a remote power unit.

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“Pentaflow Cylinders vs. Regular Cylinders”

Pentaflow lift cylinders are unique. In the base of the cylinder piston there is a port. This port is sealed by a ball to prevent oil from passing through. When oil is pumped into the cylinder, the cylinder extends. When the cylinder is at full extension, an actuator pushes the ball off the port which allows oil to return to the reservoir. This prevents the cylinder from dead ending. This also helps bleed any air inside of the hydraulic system. When the cylinder retracts, it siphons hydraulic oil into the top of the cylinder keeping all components of the cylinder lubricated.

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What Does Low Height, Travel, and Raised Height Mean in Lift Table Terms?

In lift table terms, low height refers to the measurement of the top of the table’s platform to the floor when the table is in its lowest position. Travel refers to the amount of vertical lift from the tables resting position to its highest position. Raised position is the measurement of the table’s platform to floor when the table is at its extended height.

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