PUMP GP-GEAR 4466911 - Caterpillar

Optional Three-Point Hitch
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Three-point hitch components and lines (1) Implement control valves (15) Adapter between three-point hitch control valve and implement control valves (16) Signal line from implement control valves and hitch for load pressure (20) Lines to head end of three-point hitch cylinders (21) Lines to rod end of three-point hitch cylinders (23) Three-point hitch control valve (24) Solenoid valve (25) Supply line for pilot oil to solenoid valve (26) Return line for pilot oil from solenoid valve (32) Quick couplers
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(19) Three-point hitch lift cylindersThe three-point hitch hydraulic system is an attachment to the machine. The hitch hydraulic system consists of hitch cylinders (19), hitch control valve (23), solenoid valve (24), and associated lines groups. The three-point hitch components are an addition to the standard implement hydraulic system.
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Three-Point Hitch Controls (40) Adjustable stop (41) Setpoint switch (42) Hitch mode switch (43) Hitch control leverHitch control valve (23) is electrohydraulically operated by solenoid valve (24) .Solenoid valve (24) receives pilot oil from charge pump (17). The pilot oil enters solenoid valve (24) and the oil shifts the main control spool in hitch control valve (23). The implement control valves supply oil to the three-point hitch control valve.An electrical signal from the electronic control shifts an internal spool in solenoid valve (24). When the internal spool shifts, pilot oil from the charge pump enters the hitch valve. The pilot oil from the charge pump shifts the main control spool in hitch valve (23). Supply oil from the implement control valves is then directed through lines (20) to the head end of hitch cylinders (19). The rod end of the hitch cylinders are always open to the hydraulic tank through line (21) .The hitch control valve has a main control spool that determines the amount of flow and rate to the load. Hitch valve (23) is equipped with a relief valve. The relief valve relieves the pressure in lines (20) at 20685 480 kPa (3000 70 psi). Also, hitch valve (23) has a flow control spool that serves as a load check valve that shuts off flow at approximately 620 kPa (90 psi) or less.Since the hitch valve is the last valve in the stack, the hitch valve does not have a resolver valve. The hitch valve has a passage in order to send the load pressure of the hitch valve to a resolver valve. The resolver valve is located in adjacent manifold (15) .Control lever (43) raises or control lever (43) lowers the three-point hitch. In order to raise the hitch, the operator must move the control lever to the rear. In order to lower the hitch, the operator must move the control lever forward. Move control lever (43) all the way forward in order to place the hitch in the FLOAT position.Adjustable stop (40) allows the operator to set a certain depth of operation. The adjustable stop can be bypassed. The adjustable stop cannot be bypassed when the adjustable stop locks the control lever