MIL-J-26149E
f. Foolproofness - Where improper installation of an item could cause malfunction of the Item or the equipment in which it is Installed, an unsymmetrical mounting means shall be provided where practical. That mounting shall allow the item to be Installed only in its proper operating position. If an unsymmetrical mounting means is not practical, the item shall be so mounted that its proper operating position can be readily and visibly determined by service maintenance personnel.
g. Repair kits and soft kits shall be designed and developed to extend the life of the jack assembly by repairing or replacing those piece parts that are subject to wear during normal use.
3.6.4 Capacity and type. The rated capacity shall be specified in U.S. tons (kg.). The type of jack shall be specified as axle, cantilever, unipod or tripod (see 1.2 and 6.2).
3.6.5 Floor loading. The jack base Or foot pads shall be of such proportions, relative to floor contact area, as to prevent floor loading in excess of 400 psi (2758KPa) when supporting a rated capacity load. However, in these circumstances where tight clearances or special accommodations are necessary, the floor loading may not exceed 600 psi (4137 kPa). Floor loadings
*in excess of 400 PSI (2758KPA) will require approval of the responsible procuring activity.
3.6.6 Mobility. Jacks having a gross weight in excess of 120 pounds
(54.4 kg.) shall be provided with type I, class lb mobility in accordance with
MIL-STD-1784 except that the slope requirement shall be a maximum of 15°.
3.6.6.1 Casters or wheels. Unless otherwise specified by the procuring activity, all casters shall be furnished in accordance with requirements of MS24380. Casters on tripod or axle jacks may be spring loaded for ease of placement.
3.6.6.2 T owbar.
A towbar meeting the requirements for type I, class 2 of
MIL-STD-1784 shall be provided. When specified, provisions shall be made to secure the towbar to the jack structure when not in use.
3.6.6.3 Carrying handles. All hand carried jacks shall have carrying handle(s). The design of the carrying handles shall favor the user. Handles shall be ruggedized and located in relationship to the center of gravity (cg) such that the jack is easily controlled while it is being moved about. Also, if possible, the carrying handles may be used to protect the controls while the jack is in operation. A jack having a gross weight not to exceed 60 lbs. (27.2 Kg) shall require only one handle. For a jack weighing between 61 lbs. (27.7 Kg) to 120 lbs. (54.4 Kg), two handles shall be required. Any jack exceeding 120 lbs. shall meet the mobility requirements stated herein.
3.6.7 Heat treatment. Heat treatment of steel materials shall be in accordance with MIL-H-6875.
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