SAUER DANFOSS 90R 90L 90M Series Hydraulic Variable Displacement Piston Pump 90M130-NC-0-N-8N-0-F1-W-00-NNN-00-00-G3

SAUER DANFOSS 90R 90L 90M series Hydraulic Variable displacement piston pump 90M130-NC-0-N-8N-0-F1-W-00-NNN-00-00-G3

Design Danfoss Series 90 closed circuit piston pumps convert input torque into hydraulic power. The input shaft transmits rotational force to the cylinder block. Bearings support the input shaft at the front and rear of the pump. The shaft is splined into the cylinder block. A lip-seal at the front end of the pump prevents leakage where the shaft exits the pump housing. The spinning cylinder block contains nine reciprocating pistons. A ball joint at one end connects each piston to a brass slipper. Fixed-clearance hold-down brackets keep the slippers in contact with the swashplate. The reciprocating movement of the pistons occurs as the slippers slide against the inclined swashplate during rotation. The valve plate connects one half of the cylinder block to low pressure and the other half to high pressure. As each piston cycles in and out of its bore, fluid is drawn from the inlet and displaced to the outlet thereby imparting hydraulic power into the system. A small amount of fluid flows from the cylinder block/valve plate and slipper/ swashplate interfaces for lubrication and cooling. Case drain ports return this fluid to the reservoir. The angle of the swashplate controls the volume of fluid displaced into the system. The servo piston forces the swashplate into an inclined position. The pump control, acting on input from the operator, by modulating pressure balance across the servo piston, sets displacement in the system circuit.

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