ENGINE AR-COMPLETE 1246759 - Caterpillar

Vibratory Drum Assembly
Vibratory Drum Assembly
(1) Eccentric weight. (2) Eccentric weight. (3) Drive shaft. (4) Vibration motor. (5) Coupling shaft. (6) Coupling.Vibratory action for the machine occurs at the drum assembly. Drive shaft (3) is connected to vibration motor (4) with coupling (6). Eccentric weights (1) and (2) are connected by coupling shaft (5).When the operator turns the vibration system on, the vibration motor causes drive shaft (3), eccentric weight (2), coupling shaft (5) and eccentric weight (1) to rotate. The rotation of the eccentric weights creates the desired vibratory action of the drum assembly.
Eccentric Weight Cross Section (High Amplitude)
(6) Steel shot.Eccentric weights (1) and (2) are loaded with steel shot (6). When the vibratory selection switch is placed in the high amplitude mode, the eccentric weights rotate in one direction. The steel shot is captured in one side of the weight compartment as shown above.The weight of the steel shot in this position increases the natural eccentricity of the weights. This causes the drum assembly to vibrate in the high amplitude mode.
Eccentric Weight Cross Section (Low Amplitude)
(6) Steel shot.When the vibratory selection switch is placed in the low amplitude mode, the eccentric weights rotate in the opposite direction. This causes steel shot (6) to be captured in the opposite side of the weight compartment as shown above.The weight of the steel shot in this position offsets the natural eccentricity of the weights. This causes the drum assembly to vibrate in the low amplitude mode.Circuit Functions
Vibration System - OFF
Vibration System Circuit Diagram - OFF
(1) Vibration motor. (2) Cooling (flushing) relief valve. (3) Oil line from propulsion cooling valve. (4) Closed circuit loop line. (5) Check valve. (6) Servo piston assembly. (7) Charge relief valve. (8) Oil line from hydraulic oil filter. (9) Vibration pump. (10) Vibration cooling valve. (11) Closed circuit loop line. (12) Check valve. (13) Hydraulic oil tank. (14) Vibration control solenoid valve.Return oil from the steering system supplies the charge oil (make-up oil) for the vibration system. Charge oil is supplied to the hydraulic oil filter before entering the vibration system through oil line (8).When either the vibratory control switch on top of the propulsion control lever or the vibratory selection switch is placed in the OFF position, electric circuit to vibration control solenoid valve (14) is isolated. The vibration amplitude valve is held in position (E) (null position) by the two centering springs. The vibration amplitude valve blocks charge oil from flowing through servo piston assembly (6), and the vibration pump swashplate is at zero angle (neutral position). In this position there is no flow of oil from vibration pump (9) to vibration motor (1).When the vibration system or propulsion system are not in use the charge pressure is limited to 2900 + 210 - 0 kPa (420 + 30 - 0 psi) at 38°C (100°F) minimum by charge relief valve (7). Excess charge oil passes through the vibration pump and motor cases, the propulsion pumps and the vibration cooling valve before returning to hydraulic