1.40 HYDRAULICS Crowd cylinder (51) The crowd cylinder is fitted inside the head of the boom and controls the operation of the head attachments. The crowd cylinder is supplied with operating pressure oil from the crowd/compensator section (28) and a load control valve (52). Specification: Stroke 350 mm Bore 125 mm Load control valve (52) The load control valve for the crowd cylinder is fitted between the crowd cylinder (51) and the crowd/compensator section (28). The valve prevents any load movement in the event of hose bursts or leakage. If the valve is defective, a complete new cartridge must be fitted.
The load control valve is factory set and should never be dismantled or adjusted except for resealing. Key to Load Control Valve 1. From the crowd/compensator section (28) 2. Crowd/compensator cylinder (rod side) 3. Crowd/compensator cylinder (full bore side) 4. From the crowd/compensator section (28) 5. Pilot pressure 6. Supply pressure 7. Pressure relief