On-Site Magazine

Enerpac Cube Jack lifting system

By Adam Freill   

Construction Equipment

(Photo courtesy of Enerpac)

The Enerpac Cube Jack lifting system is designed to enable safer excavator maintenance. Based on the hydraulic industrial tools specialist’s SCJ-Series Cube Jacks, the system enables lifting and holding of the entire cab, boom and arm, allowing the undercarriage to be safely removed.

During maintenance of the excavator’s swing drive and bearings, the undercarriage unit must be separated from the upper body cab and arm to give access to the swing motor and multiple sets of planetary gears, and is usually a two-person job, says the company. It says its system offers a safer, CE-certified, approach to removing the undercarriage.

The system uses two pairs of cube jacks that provide coordinated hydraulic lifting for loads up to 25 tons per jack to a height of six-and-a-half feet. Two cube jacks are positioned under a lifting beam at the rear of the excavator, while two cube jacks are located under the arm’s bucket lugs. Each pair of cube jacks is connected to a hydraulic pump to synchronously lift and lower the excavator body and arm.

The excavator lifting system automatically self-locks so that engineers can work safely under the raised cab without the need for secondary jack stands, says Enerpac, whose SCJ-Series Cube Jacks use a base lifting frame and self-aligning, lightweight steel cribbing blocks to provide high-capacity and stabilized lifting. The system self-locks as each cribbing block is manually added or removed, instead of being held by hydraulic pressure. Once the mechanical lock engages, the lift cylinder retracts, and another cribbing block can be added or removed.




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