HEUI Hydraulic pump components

heui hydraulic pump component

The pump control valve (1), also referred to as the “injection actuation pressure control valve,” controls the angle of the pump swashplate which varies the pump oil flow. Also mounted on the hydraulic supply pump group is the hydraulic temperature sensor (2). This sensor is used by the ECM for viscosity compensation to maintain consistent fuel delivery and injector timing regardless of viscosity changes caused by varying hydraulic temperatures. Both sensors are threaded into the supply pump case.

heui hydraulic pump component 2

The oil pressure sensor (1) is mounted on the hydraulic pump. The oil pressure sensor is used by the ECM to generate a low pressure warning for the operator.

Also visible in this view are the hydraulic temperature sensor (2) and the pump control valve (3).

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