13.8.2 Storage

Jacks should always be stored upright. When not in use, they should be returned to a designated storage area and not be left laying about work areas. The storage area should meet the general requirements given in section 1.7.2 Storage and Handling of this code, in addition to which the following recommendations are made:

  1. In the case of hydraulic jacks, the ram should be lowered prior to storage, thus protecting the face of the ram from damage. Some hydraulic jack designs incorporate leather cup washers. In this case, the jack should be given a single stroke of the operating handle and the release valve kept closed whilst in storage to ensure the cup washers will remain expanded. In other cases, the release valve should be left open to keep the system pressure free. In case of doubt, seek the supplier’s recommendations on storage which should be followed. Operating levers should be removed, identified and stored separately from the jacks.

    Note

    During storage, seepage of oil may occur and such leaks should be investigated and if necessary, the jack should be overhauled.

  2. Prior to storage, mechanical jacks should be lubricated and greased to protect the teeth of racks, pawls and screw threads from corrosion. The jack should be stored in its lowest position to protect the teeth of racks and screw threads from damage. The operating lever or tommy-bar should be removed from the jack, identified and stored separately from the jack.

    Note

    Care is needed when lubricating ratchet jacks as research has shown that excessive grease can cause the holding pawl to stick and not engage with the rack to sustain the load. The holding pawl has a fall back action which is vital to the safe use of the jack and any delay to this action can result in the load being dropped.