{"data":{"news":{"items":[{"title":"Safer excavator maintenance with Enerpac cube jack lifting","date":"2024-06-19 00:01:12","id":5377,"author":"","blurb":"","blurb_image_uid":"https://dxfpracgmlczp.cloudfront.net/2024/06/1717294502027_Photo 1 - Enerpac cube jacks and excavator.jpg","blurb_expanded_image_uid":null,"article":"\n\t\n\n\n

Hydraulic industrial tools specialist, Enerpac, has introduced a lifting system for safer excavator maintenance. Based on Enerpac SCJ-series Cube Jacks, it enables lifting and holding of the entire cab, boom and arm, allowing the undercarriage to be safely removed.

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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. Until now, this would have involved at least two service engineers jacking up the body and holding it on stands – a time consuming and hazardous practice.

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The Enerpac cube jack lifting system offers a safer, CE-certified approach to removing the undercarriage. It comprises two pairs of cube jacks providing coordinated hydraulic lifting of loads up to 25 t per jack to a height of 2 m. Two cube jacks are positioned under a lifting beam at the rear of the excavator, while the other two 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.

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“The excavator lifting system has been developed in collaboration with a leading excavator maintenance company looking for a safer CE-certified approach to removing the undercarriage. It automatically self-locks so that engineers can work safely under the raised cab without the need for secondary jack stands,” said an Enerpac spokesperson. “It has been well received especially for its safety, secure load holding, precision lifting and lowering, and quick and easy set-up, which make it attractive to users and customers alike.”

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Enerpac cube jack technology has been employed in many industrial lifting applications. The SC-series Cube Jacks use a base lifting frame and self-aligning, lightweight steel cribbing blocks to provide high-capacity and stabilised lifting –offering a safer, controlled and more efficient alternative to climbing jacks with wooden cribbing.

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Lloyds witness tested to 125% of maximum working load, the incremental cube jack lifting system is self-locking to support the load 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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Enerpac Heavy Lifting Technology has successfully completed side-load stability testing of the SCJ-100 (self-locking cube jack) by performing a four-point lift with a 400-t load up to 3 m at its factory in Hengelo, the Netherlands. The SCJ-100 raises the bar for cube jack lifting from 2 m to 3 m and doubles the lifting capacity compared to the smaller SCJ-50.

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The SCJ-100 Cube Jack is a compact and portable hydraulic solution for synchronised incremental lifting and lowering of heavy loads. It uses a base lifting frame and self-aligning, lightweight steel cribbing blocks to provide high-capacity and stable lifting.

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Steel cribbing blocks have several benefits over wood cribbing, said Enerpac, including fewer cribbing components to handle and align, lifting up to eight times faster, and lifting higher than using traditional cribbing methods.

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During side-load testing, four units of the SCJ-100 were used to lift a 400-t test load. At 2 m high, the load was subjected to a side load of 10 t (2.5%) by attaching a cylinder to the load and pushing the load to the full stroke of the cylinder. At 3 m, the maximum lift height for the SCJ-100, the load was subjected to a side load of 6 t (1.5 %).

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“Even during the toughest side-load test, the performance of the SCJ-100 was impressive and enhances safety,” said Pete Crisci, product line director at Enerpac Heavy Lifting Technology. “By raising the lifting capacity and maximum lift height, we now offer users a way of tackling heavy lifts that would have been impossible before without excessive, and time consuming, use of climbing jacks with wooden cribbing.”

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Up to eighteen 24.5-kg steel cribbing blocks can be safely and easily stacked onto the SCJ-100 base frame yielding a maximum height of 3,006 mm. The base frame footprint measures just 655 mm x 636 mm, making it ideal for restricted operating space. A low 558 mm minimum initial jacking height increases flexibility and reduces operational start-up time.

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The SCJ-100 also comes with a storage frame to make tool maintenance and inventory management easier.

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Cube jacks operate with up to 700 bar hydraulic pressure and are compatible with standard pumps, such as the Enerpac split-flow pump that offers the ability to evenly operate multiple cube jacks.

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