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9 1 21 29 3 7 25 10 24 11, 12 19 17 18 37 20 39 47, 50 42 8 23 52 26 27 38 40 22 14 31 32 4 15 35 36 43 45 49 6 46 51 44 48 RM 250X - RM 900X Sectional drawing / description of function 1 General Characteristics and Features Design: The radial piston hydraulic motor has been designed with a high load capacity. It is efficient, has a low moment of inertia, and is capable of very low speeds and has excellent reversing properties. The concept features make it extremely quiet, being suitable for servo control systems with facility to work either as amotor or pump in booth directions. Design andOperation DriveMotor Consists of a close grain, high strength, cast iron cylinder block. Eccentric crankshaft concept. Operating characteristics: Five radial piston/connecting rod assemblies (14) bear on the crankshaft (7) which is located by heavy duty tapered roller bearings. Crankshaft bearings (17 & 18): Pre-loaded to take the thrust in booth axial directions, ensures silent running and allows heavy radial and axial loading on the output shaft (e.g. gear drives). Connecting Rod (14.1): The computer optimated design is hydrostatically balanced on the crankshaft with sufficient leakage to ensure lubrication and cooling. Friction losses are reduced to a minimum and, stick slip action is avoided at low speeds. High starting torque and running torque combined with high speeds are important features of the design. Long service life is assured since con-rod slippers are unaffected by contamination and self adjustable. Non- inflammable fluids have been used with success. Noise generation is also reduced by the cushioning effect of the hydrostatic bearing design.