Danfoss 45 Series ER R130B axial variable piston pump

Series 45 Frame E pumps have a dual servo piston design with a cradle-type swashplateset in polymer-coated journal bearings.The bias piston increases swashplate angle.Thedisplacement piston decreases swashplate angle.At equal pressure, the larger diameterdisplacement piston overpowers the bias piston.Nine reciprocating pistons displacefuid from the pump inlet to the pump outlet as the cylinder block rotates on the pumpinput shaft.The block spring holds the piston slippers to the swashplate via the slipperretainer.The cylinder block rides on a bi-metal valve plate optimized for high volumetriceffciency and low noise.Tapered roller bearings support the input shaft and a viton lip-seal protects against shaft leaks.

An adjustable one spool (PC only, not shown) or two spool (LS) control senses systempressure and load pressure (LS controls).The control ports system pressure to thedisplacement piston to control pump output flow.