ENGINE AR-COMPLETE 1375480 - Caterpillar

When the emulsion spray system is operating in CLEANOUT mode, the reverse solenoid is energized. In this case, the left envelope of the pump control valve (1) is active. Charge oil enters the servo cavity of emulsion spray pump (5). The pressure in the cavity overcomes the spring force. The pump servo moves, and the angle of the swashplate changes.Supply oil from the reverse side of emulsion spray pump (5) flows to reverse combination valve (2). This oil also flows to the reverse side of emulsion spray motor (9). The supply oil causes the motor to counterrotate. After turning the motor, reduced pressure oil returns to the forward side of the emulsion spray pump. The returning oil completes the circuit.A flushing orifice is installed between port "MB" and port "T2" of the pump. This orifice allows some of the oil in the high-pressure side of the hydrostatic loop to flow into the pump case drain. Charge pressure acts on charge relief valve (7). When charge pressure reaches 2500 kPa (362 psi), the oil pressure overcomes the spring force, and the charge relief valve opens. This action directs charge pump flow into the case drain.
Illustration 4 g03812837
Emulsion Pump (operating)
(9) Emulsion spray motor
(10) Inlet valve
(11) To supply truck connection
(12) From emulsion supply truck connection
(13) Strainer
(14) Recirculation valve
(15) Emulsion pump
(16) Return valve
(17) Flow meter
(18) Spray bar
(19) From auxiliary pump
(20) Spray bar solenoid
(21) Emulsion spray cylinder
(22) From port "A" emulsion spray pump
(23) To port "B" emulsion spray pump When the emulsion spray system is activated, spray bar solenoid (20) is energized and the control valve shifts. Supply oil from auxiliary pump (19) is sent to the head end of emulsion spray cylinder (21). This action causes the cylinder rod to extend. In this case, the spray nozzles on spray bar (18) open and return valve (16) closes.Note: Emulsion spray cylinder (21) is mechanically linked to spray bar (18) and return valve (16). After a preprogrammed one-second delay, the emulsion spray motor (9) begins to rotate. Rotation of the emulsion spray motor causes the emulsion pump (15) to rotate. As emulsion pump (15) rotates, emulsion is drawn from emulsion supply truck connection (12) through open inlet valve (10) and strainer (13). In this case, filtered emulsion passes through the pump. The emulsion then passes through flow meter (17) and is delivered to spray bar (18). When the spray nozzles on spray bar (18) are open, emulsion is delivered through the nozzles to the mixing chamber. Note: Spray bar solenoid (20) and emulsion spray cylinder (21) are part of the auxiliary hydraulic circuit. For additional information about the auxiliary hydraulic circuit, refer to Auxiliary Hydraulic System.
Illustration 5 g03812838
Emulsion Pump - (recirculate) Back to Pump
(9) Emulsion spray motor
(10) Inlet valve
(11) To supply truck connection
(12) From emulsion supply truck connection
(13) Strainer
(14) Recirculation valve
(15) Emulsion pump
(16) Return valve
(17) Flow meter
(18) Spray bar
(19) From auxiliary pump
(20) Spray bar solenoid
(21) Emulsion spray cylinder
(22) From port "A" emulsion spray pump
(23) To port "B" emulsion spray pump The above illustration shows the emulsion