HOSE AS 3714841 - Caterpillar

Illustration 1 g00683042
Vibratory Valve (1) Vibratory pump (2) Charge pressure line (3) Charge pressure test port (4) Line to oil cooler and tank (5) Line to vibratory motor (Loop line) (6) Charge relief valve (7) Pressure override valve (POR valve)Charge Relief Valve
The charge oil is supplied by the steering pump. The charge oil performs the following functions:
cool the main circuit.
flush the main circuit.
cool the pump case.
flush the pump case.
cool the motor case.
flush the motor case.The charge oil replenishes the lost oil in the main circuit, and the charge oil supplies control oil for the vibratory pump. The charge pressure is limited by the charge relief valve (6). The pressure of the charge relief valve is checked at test port (3). All return oil to the hydraulic oil cooler goes through the charge relief valve. The oil return line is connected to the vibratory valve at line (4). See Specifications, Systems Operation, and Testing and Adjusting, KENR2829 for further information on the steering system.Pressure Override Relief Valve
Illustration 2 g00592689
Pressure Override Relief Valve (1) Adjustment screw. (2) Locknut. (3) Spring. (4) Passage. (5) Valve. (6) Passage. (7) Piston. (8) Chamber. (9) Passage. (10) Slug. (11) Passage.Oil from the high pressure side of the closed circuit enter the POR valve at either passage (9) or (11). Passage (9) or (11) is dependent on the side of the closed circuit which is pressurized. Slug (10) will move upward if the high pressure is in passage (11). Slug (10) will move downward if the high pressure is in passage (9) .When the system pressure equals the setting for the pressure override valve, this pressure will cause the piston (7) and the valve (5) to move against the spring (3). Passage (4) directs the pressure oil from the charge pump into passage (6). The oil leaves passage (6) for the drain. As the servo pressure drains, the centering springs reduce the angle of the swashplate.While the vibratory system is operating and the system is under peak load, the valve (5) modulates the holding charge pressure on the swashplate. The stroke of the swashplate angle is held in a position in order to supply makeup oil for system leakage. The swashplate angle also maintains the circuit pressure at the POR setting until the load is reduced.During the start-up of the vibratory system, the POR valve limits the rate for the stroke of the pump swashplate. The POR valve reduces the power requirements of the oil in the closed circuit. The POR valve eliminates the unnecessary heating of the oil in the closed circuit. The POR valve does not protect the pump or the motor during moments of spikes.The pressure from the POR is checked at the test port of the main loop on the vibratory pump. The pressure can be adjusted by loosening the locknut (2) and adjusting the screw (1) .