172Cylinder3Pumpin the catalogue, upon request. Please contact us for further information.● Be sure to use a cylinder within the operating pressure range. If the internal pressure exceeds the maximum operating pressure, the cylinder or the hose may be damaged resulting in an accident. ● The cylinder must receive a vertical load at its center. Install the cylinder vertically to the receiving surface. An eccentric load may overturn or damage the cylinder. ● The allowable eccentric load is within 2.5 % of the load specified in the specifications. Do not apply a diagonal load or impact load. Doing so may overturn or damage the cylinder. ● In the case of manual pumps and two-stage electric pumps, low-pressure discharge volume switches to high-pressure one automatically. Rapid traverse is made under no load condition, which increases work efficiency. ● A combination of valves determines the suitable control circuit, such as a falling-by- self-weight prevention circuit or a pressure control circuit. See the examples of combi- nations (see pages 9 and 10) and the examples of valve applications with circuits (see pages 104 and 105). Please contact us for further information. ● When refilling the hydraulic oil, use ISO VG 32 oil. Use ISO VG46 for MP-17 electric pumps or larger ones and electric pumps of the 200 MPa series. For hydraulic oil, see “Riken’s Genuine Power Oil” on page 175. For details on hydrau- lic oils made by oil manufactures, see page 224. ● The collar thread must be usually used to secure the cylinder with a flange or the like (see page 49). ● Be sure to use a cap or relative item if the piston thread receives a load directly. In addition, use parts for cylinders (see pages 48 to 52) according to the application.● If using cylinder parts such as caps, be sure to screw them completely. If they are not screwed com- pletely and are also used frequently, the piston thread may be damaged. Accordingly, they may be broken off or not be able to be removed. If the orientations of cylinder parts such as cylinder bases and clevises are required to be aligned, please let us know your request. ● If the cylinder is frequently used, use a strong-type cylinder (see pages 34 to 36). Cylinders may be damaged and need repair at an early stage. ● The cylinder output must be within 70 to 80 % of the maximum output. Cylinders may be damaged and need repair at an early stage. ● Select a cylinder that is longer than the necessary stroke. Avoid abutting by using the whole stroke. Otherwise, device failure could result.An external force is required to return thepiston. For the return force, see the speci-fications for the cylinder.The return spring generates force to re-turn the piston only.In addition, the return time varies depending on the hose length, the hydraulic oil temperature, and so on.Select a double-acting type if the cylinderis frequently used and the operating cycletime needs to be managed, if pull outputis required when a heavy jig is attached tothe piston, or if pressure fluctuations arelarge.Single- acting type[Load-return type][Spring-return type][Double-acting type]cat-No.78E since2017Output requiredWhile the cylinder is operating, the output must be 70 to 80 % of the maximum outputspecified in the specifications.Select a cylinder that is longer than the stroke to be used.●We can manufacture 5000 kN or larger cylinders and even those that are not listed Selecting a single- or double-acting typeA single- or double-acting type can be selected by return type.Selecting a manual (foot) pump or electric pumpModel SelectionHow much output is required ?selectionselectionStrokekNmm
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