TM 9-243TYPES AND USES - ContinuedRATCHET LEVER JACKSA vertical ratchet lever jack has a rack bar that is raisedor lowered through a ratchet lever. Some are equippedwith a double socket, one for lowering, one for raising.Others have one socket and have an automatic loweringfeature.An outrigger ratchet jack is ratchet operated and has anextra reverse ratchet handle and a base plate.HYDRAULIC JACKSA push-pull hydraulic jack consists of a pump (1) andram (2) connected by a hydraulic or oil hose (3). Thesejacks are rated at 3, 7, 20, 30, and 100-ton capacitiesand have many different applications.The push-pull hydraulic jacks are furnished with anassortment of attachments that enable you to performcountless pushing, pulling, lifting, pressing, bending,spreading, and clamping operations. The pump is handoperated. Simply turn the control valve (4) on the side ofthe pump clockwise, stroke the hand lever (5) up anddown and the ram will extend. The flexible hydraulic oroil hose allows you to operate the ram from a safedistance in any desired position.The ram retracts automatically by turning the controlvalve counterclockwise. The attachments can bethreaded to the end of the plunger, to the ram body, orinto the ram base.A hydraulic jack operates through pressure applied toone side of a hydraulic cylinder which moves the jackhead. These jacks are automatically lowered by releas-ing the pressure. Vertical hydraulic jacks come in avariety of types, in capacities from 3 to 100 tons, havingdifferent extended heights.2 0 - 3
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