RELAY (SEM) 5288660 - Caterpillar

Illustration 1 g01073733
CB-214E and CB-224E Vibratory System in the OFF PositionWhen the engine is running, the vibratory pump draws oil from the hydraulic tank through a strainer. Supply oil flows to the P port of the vibratory manifold. When the vibratory control switch is OFF, the solenoid for the front drum is not energized, and the anti-lope relief valve is closed. The solenoid for the front drum opens a passage which allows pump supply oil to flow through the oil cooler. The oil flows through the cooler to the tank. The anti-lope relief valve and the check valve block the return lines from the vibratory motors, and the motors do not turn.
Illustration 2 g01073754
CB-225E Vibratory System in the OFF PositionThough the vibratory system on the CB-214E and the CB-224E are similar to the vibratory system on the CB-225E, there are several main differences:
The CB-225E does not have a rear vibratory motor.
The solenoid for the rear drum is not operational.
The inter circuit line relief valve serves no purpose in the system.
Illustration 3 g01073773
CB-214E and CB-224E Vibratory System in the FRONT PositionWhen the control switch for the vibratory system is ON and the control switch for the vibratory drum is in the FRONT DRUM, the solenoid for the front drum is energized, and the solenoid for the rear drum is de-energized. The check valve in the solenoid for the front drum blocks the passage for pump supply oil which flows through the oil cooler. When the solenoid for the front drum is energized, pilot oil acts against the anti-lope relief valve, and pump supply oil flows to the inlet side of the front drum motor.The pilot oil causes the anti-lope relief valve to open. The open valve creates a passage between the outside of the front drum motor and the oil cooler. The pressure differential across the front drum motor causes the motor to rotate. This will cause the front drum to vibrate. Return oil from the front drum motor flows across the solenoid valve for the rear drum. The oil bypasses the rear drum motor. The return oil goes through the anti-lope relief valve and the oil cooler and into the tank.When the vibratory control switch is moved to the OFF position, the solenoid for the front drum de-energizes. This will open a passage which will allow the supply oil from the pump to flow through the oil cooler. This action discontinues the pilot signal to the anti-lope relief valve and the supply flow to the inlet side of the front drum motor. The spring which acts against the anti-lope relief valve closes the valve. The closed valve blocks the return passage from the outlet side of the front drum motor.The momentum of the vibratory weights in the front drum attempts to continue rotating the vibratory motor. This rotation causes pressure in the return line of the front motor to increase. The increased pressure acts against the anti-lope relief valve. When the pressure which acts against the anti-lope relief valve reaches a