A bucket cylinder is used to move the bucket for a bucket OPEN or a bucket CLOSE operation. When the bucket cylinder rod EXTENDS, the bucket CLOSES. When the bucket cylinder rod RETRACTS, the bucket OPENS.
The main hydraulic pumps supply high-pressure oil to the main control valve. The main hydraulic control valve determines the direction and speed of the bucket cylinder in proportion to the movement of the joystick. A BUCKET CLOSE operation is accomplished when the oil delivery from the idler pump is supplied to the head end of the bucket cylinder. Flow combiner proportional hydraulic modulation valve (PHMV) is activated by the machine ECM. Flow combiner spool then shifts to the center, preventing idler pump oil to combine with drive pump oil. The oil from the idler pump then flows to the bucket independent metering valve (IMV) section.
Components of the bucket system include:
- Bucket IMV section
- Bucket cylinder
Note: Refer to the appropriate sections in this manual for more information.