HOUSING 1141479 - Caterpillar

When the tilt lever is moved to the TILT BACK position, the tilt lever position sensor sends a PWM signal to the Implement ECM. The Implement ECM analyzes the input signals from the tilt lever position sensor and the tilt linkage position sensor. The Implement ECM then sends current to energize the tilt back solenoid (22A). The Implement ECM electrical output is proportional to the input signals from the tilt lever position sensor and the tilt linkage position sensor.The tilt back solenoid valve directs pilot oil to the tank and decreases the oil pressure at the top end of the tilt spool (22). The pilot oil pressure at the dump end of the tilt spool moves the spool up to the TILT BACK position.The tilt spool directs oil from the implement pump (1) through the load check valve (22C) to the head end of the tilt cylinder (17). The tilt cylinder extends. The tilt spool also opens a passage for oil in the rod end of the tilt cylinder to return to the tank.The tilt back line relief valve (25) limits the oil pressure in the head end of the tilt cylinderDUMP Position
Illustration 8 g03667032When the tilt lever is moved to the DUMP position, the tilt lever position sensor sends a PWM signal to the Implement ECM. The Implement ECM analyzes the input signals from the tilt lever position sensor and the tilt linkage position sensor. The Implement ECM then sends current to energize the dump solenoid (22B). The Implement ECM electrical output is proportional to the input signals from the tilt lever position sensor and the tilt linkage position sensor.The dump solenoid valve directs pilot oil to the tank and decreases the oil pressure at the bottom end of the tilt spool (22). The pilot oil pressure at the tilt back end of the tilt spool moves the spool down to the DUMP position.The tilt spool directs oil from the implement pump (1) through the load check valve (22C) to the rod end of the tilt cylinder (17). The tilt cylinder retracts. The tilt spool also opens a passage for oil in the head end of the tilt cylinder to return to the tank.The dump line relief valve (26) limits the oil pressure in the rod end of the tilt cylinder.RAISE Position
Illustration 9 g03667033When the lift lever is moved to the RAISE position, the lift lever position sensor sends a PWM signal to the Implement ECM. The Implement ECM analyzes the input signals from the lift lever position sensor and the lift linkage position sensor. The Implement ECM then sends current to energize the raise solenoid (21A). The Implement ECM electrical output is proportional to the input signals from the lift lever position sensor and the lift linkage position sensor.The raise solenoid sends pilot oil to the tank and decreases the oil pressure at the top end of the lift spool (21). The pilot oil pressure at the lower end of the lift control valve spools moves the control