Enerpac Jack Up Systems

push up system

The jack up system is a custom developed multipoint lifting system. A typical system setup includes four jack up units positioned under each corner of a load. A four unit setup has a lifting capacity of 2,000 metric tons (500 tons per unit).

The lifting frame of a jack up unit contains four hydraulic cylinders in each corner which lift and stack steel boxes. A load is lifted in increments as boxes are slid into the system, lifted, and stacked; forming ‘lifting towers’. A jack up system is operated and controlled by a computer control unit. Each unit’s lifting and lowering operations occur simultaneously; the computer control unit’s synchronous technology maintains the balance of the load. The hydraulics power units are embedded within each unit’s lifting frame. Safe lifting heights are dependent on the expected side load.

A Jack Up System is comprised of 3 main components

  • Multiple jack up units
    – The most common system setup includes 4 jack up units.
  • Computer control unit
    – A touch screen control for operating the jack up system with automatic and manual lifting settings.
  • Electronic controlled diesel power unit
    – Supplies hydraulic power to the system. The JS500 is powered by an external powerpack. The EP5000 powerpack is embedded within each unit’s lifting frame.

A Jack Up Unit is comprised of 6 main components

  • Base frame
    – Supports the lifting frame, skid track attachments are optional.
  • Skid tracks (optional)
    – Enables the jack up system to be skidded into two directions.
  • Lifting frame
    – Contains hydraulic cylinders located in each corner to lift the boxes and locking strips for stable stacking.
  • Steel Boxes (barrel)
    – Boxes are slid into the lifting frame and are lifted up by the cylinders. Each box is designed to carry a load of 500 metric tons.
  • End box (barrel)
    – The top box the load is placed upon
  • Box insert rollers
    – Rollers facilitate easy entry of boxes into the lifting frame.
jack_up_system_ _group
enerpac js series line drawing
Capacity per Tower Model Number Maximum Sideload Base Frame Dimensions
Barrel Dimensions
L x W x H
ton (kN) A B C D (mm) (kg)*
125 (1250) JS-125 3% @ 6m 1200 1100 990 1850 600x600x250 2200
250 (2500) JS-250 3% @ 10m 2250 2050 1475 3450 1150x1150x500 7500
500 (5000) JS-500 4% @ 15m 2800 2300 1700 4500 1700x1700x700 13.000
750 (7500) JS-750 5% @ 20m 3670 3250 2375 6100 2300x2300x1000 24.000

* Weight per jack-up unit, excluding barrels.