CB-534D, CB-534D XW and CB-564D Vibratory Asphalt Compactors Vibratory System Vibratory Valve Caterpillar


Vibratory Valve
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1.1. Vibratory Control Valve
2.2. Front Vibratory Selector Valve
3.2. Rear Vibratory Selector Valve (ON)
4.2. Inter Circuit Relief Valve
5.1. Flushing Valve
6.2. Flushing Valve Spool NEUTRAL Position
7.2. Flushing Valve Spool FORWARD Position
8.2. Flushing Valve Spool REVERSE Position



Illustration 1g00941697

Schematic of the Vibratory Control Valve and the Flushing Valve

(1) Front Vibratory Selector Valve

(2) Oil line for the Front Vibratory Selector Valve

(3) Oil line for the Vibratory Pump

(4) Oil line for the Rear Vibratory Selector Valve

(5) Rear Vibratory Selector Valve

(6) Oil line for the Vibratory Pump

(7) Oil line for the Front Vibratory Motor

(8) Oil line for the Rear Vibratory Motor

(9) Oil line for Both Motors

(10) Inter Circuit Relief Valve

(11) Oil line to Inter Circuit Relief Valve

(12) Oil line to Hydraulic Oil Tank

(13) Oil line from Charge Filter (Steering System)

(14) Right Position of Flushing Valve Spool

(15) Flushing Relief Valve

(16) Middle Position of Flushing Valve Spool

(17) Left Position of Flushing Valve Spool

(18) Left Side Inlet to Flushing Valve Spool

(19) Right Side Inlet to Flushing Valve Spool

Vibratory Control Valve

The vibratory valve performs the following functions.

  • The vibratory control valve directs oil to the vibratory motor when the vibratory switch is in the ON position.

  • The vibratory control valve protects the vibratory motor from pressure differentials.

  • The vibratory control valve directs oil to the hydraulic oil cooler.

Oil from the vibratory pump flows into the vibratory control valve. The pressure of the vibratory control valve is set at approximately 23990 kPa (3480 psi) by the inter circuit relief valve. The solenoid valve energizes in order to activate the front vibratory selector valve or the rear vibratory selector valve. When neither solenoid valves are energized, both vibratory motors are in operation. The vibratory motors are connected in a series, when both of the vibratory motors are operating. The vibratory motors power the weights in the vibratory drums.

Front Vibratory Selector Valve




Illustration 2g00941083

Vibratory Control Valve

(1) Front Vibratory Selector Valve

(2) Oil To Front Vibratory Selector Valve

(3) Oil From Vibratory Pump

(4) Oil To Rear Vibratory Selector Valve

(5) Rear Vibratory Selector Valve

(6) Oil From Rear Vibratory Motor

(7) Front Vibratory Motor

(8) Rear Vibratory Motor

(9) Oil To Both Motors

(10) Inter Circuit Relief Valve

(11) Oil To Inter Circuit Relief Valve

(12) Oil Line To Hydraulic Oil Tank

(13) Oil From Charge Filter (Steering System)

(18) Oil To Left Side Inlet of Flushing Valve Spool

(19) Oil To Right Side Inlet of Flushing Valve Spool

(AA) System Pressure

(AB) Charge Pressure

(AC) Sump

(AD) First Pressure Reduction

(AE) Activated Components

When front vibratory selector valve (1) is in the ON mode, the solenoid is energized. Rear vibratory selector valve (5) is not energized. The system pressure leaves the vibratory pump and oil flows to front vibratory motor (7). The system pressure also flows through front vibratory selector valve (1) and continuous flow to the inlet of rear vibratory motor (8). Rear vibratory motor (8) turns the eccentric weights that vibrate the rear drum. System pressure also flows to the outlet of front vibratory motor (7). When front vibratory motor (7) has equal pressure at both the inlet and the outlet, front vibratory motor (7) will not rotate. Reduced pressure oil leaves rear vibratory motor (8) and flows back to the vibratory pump. Oil then flows to the flushing valve. Oil flows through the flushing valve spool and through the flushing relief valve. Next, the oil flows to the vibratory motor cases. The oil cools the motors and the oil flushes the motors. Oil leaves the motor cases through the case drain and flows to the thermal bypass manifold.

Rear Vibratory Selector Valve (ON)




Illustration 3g00941080

Vibratory Control Valve

(1) Front Vibratory Selector Valve

(2) Oil To Front Vibratory Selector Valve

(3) Oil From Vibratory Pump

(4) Oil From Rear Vibratory Selector Valve

(5) Rear Vibratory Selector Valve

(6) Oil From Vibratory Pump

(7) Front Vibratory Motor

(8) Rear Vibratory Motor

(9) Oil From Both Motors

(10) Inter Circuit Relief Valve

(11) Oil To Inter Circuit Relief Valve

(12) Oil To Hydraulic Oil Tank

(13) Oil From Charge Filter (Steering System)

(18) Oil To Left Side Inlet of Flushing Valve Spool

(19) Oil To Right Side Inlet of Flushing Valve Spool

(AA) System Pressure

(AB) Charge Pressure

(AC) Sump

(AD) First Pressure Reduction

(AE) Activated Components

When rear vibratory selector valve (5) is ON, the solenoid is energized. Front vibratory selector valve (1) is not energized. Pressure leaves the vibratory pump and oil flows to the inlet of front vibratory motor (7). Front vibratory motor (7) rotates the eccentric weights that vibrate the drum. Reduced pressure leaves front vibratory motor (7) and flows to the inlet of rear vibratory motor (8). Reduced pressure also flows through rear vibratory selector valve (5). Oil from rear vibratory selector valve (5) flows to the outlet of rear vibratory motor (8), to the vibratory pump, and to the flushing valve spool. When rear vibratory motor (8) has equal pressure at both the inlet and the outlet, rear vibratory motor (8) will not rotate. Oil then flows to the flushing valve. Oil flows through the flushing valve spool and through the flushing relief valve. Next, the oil flows to the vibratory motor cases. The oil cools the motors and the oil flushes the motors. Oil leaves the motor cases through the case drain and flows to the thermal bypass manifold.

Inter Circuit Relief Valve

The inter circuit relief valve is located inside of the vibratory control valve. The pressure of inter circuit relief valve (10) is set at approximately 23990 kPa (3480 psi). Inter circuit relief valve (10) prevents spikes from occurring during direction changes between the motors. The valve also prevents spikes when the front drum is changed to the rear drum.

Flushing Valve

The flushing valve is located on top of the vibratory control valve. The flushing valve has three positions:

  • Vibratory system OFF mode

  • Vibratory system FORWARD mode

  • Vibratory system REVERSE mode

Flushing Valve Spool NEUTRAL Position




Illustration 4g00941075

Flushing Valve

(12) Oil To Vibratory Motors

(14) Right Position of Flushing Valve Spool

(15) Flushing Relief Valve

(16) Middle Position of Flushing Valve Spool

(17) Left Position of Flushing Valve Spool

(18) Left Side Inlet

(19) Right Side Inlet

(AB) Charge Pressure

(AC) Sump

(AE) Activated Components

(AG) Trapped Oil

When the vibratory system is in the OFF mode, both sides of the drive loop have equal pressure. Oil flows from one side of the drive loop through right side inlet (19) of the flushing valve spool. Also, oil flows from the other side of the drive loop through the left side inlet (18) of the flushing valve spool. The pressure on both sides of the flushing valve spool is equal. The spool assembly is centered and oil does not flow to flushing relief valve (15) .

Flushing Valve Spool FORWARD Position




Illustration 5g00941076

Flushing Valve

(12) Oil To Vibratory Motors

(14) Right Position of Flushing Valve Spool

(15) Flushing Relief Valve

(16) Middle Position of Flushing Valve Spool

(17) Left Position of Flushing Valve Spool

(18) Left Side Inlet

(19) Right Side Inlet

(AA) System Pressure

(AC) Sump

(AE) Activated Components

(AF) Second Pressure Reduction

When the vibratory system is in the FORWARD mode, the left side of the drive loop has a greater pressure than the right side of the drive loop. High pressure oil flows to left side inlet (18) and pushes on the left side of valve spool (17). Reduced pressure oil flows to right side inlet (19) and pushes on the right side of valve spool (14). The difference in pressure moves the spool assembly to the right against the force of the spring. This allows the reduced pressure oil to flow to flushing relief valve (15). When the pressure is enough to overcome the spring force, the oil flows through the flushing relief valve to the case of the piston motors. This oil lubricates components of the piston motors and the oil cools the components of the piston motors. Oil from the piston motors flows to the thermal bypass valve and the return manifold.

Flushing Valve Spool REVERSE Position




Illustration 6g00941078

Flushing Valve

(12) Oil To Vibratory Motors

(14) Right Position of Flushing Valve Spool

(15) Flushing Relief Valve

(16) Middle Position of Flushing Valve Spool

(17) Left Position of Flushing Valve Spool

(18) Left Side Inlet

(19) Right Side Inlet

(AA) System Pressure

(AC) Sump

(AE) Activated Components

(AF) Second Pressure Reduction

When the vibratory system is in the REVERSE mode, the right side of the drive loop has a greater pressure than the left side of the drive loop. High pressure flows to right side inlet (18) and pushes on the right side of valve spool (17). Reduced pressure oil flows to left side inlet (19) and pushes on the left side of valve spool (14). The difference in pressure moves the spool assembly to the left against the force of the spring. This allows the reduced pressure oil to flow to flushing relief valve (15). When the pressure is enough to overcome the spring force, the oil flows through the flushing relief valve to the case of the piston motors. This oil lubricates components of the piston motors and the oil cools the components of the piston motors. Oil from the piston motors flows to the thermal bypass valve and the return manifold.

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