CB10 Vibratory Asphalt Compactor Machine Systems Piston Pump (Vibratory) Caterpillar


Piston Pump (Vibratory)
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Illustration 1g06609022
Left Side of Machine
(1) Vibratory hydraulic pump

Vibratory hydraulic pump (1) is on the left side of the machine. This pump is splined to the propel pump, which is driven by the engine. The door on the left side of the machine provides access to this component.

Vibratory hydraulic pump (1) is a piston-type pump with variable displacement. The pump housing contains two rotating groups. The rotating groups are face-to-face. The rotating group on the side of the pump with the input shaft provides flow to the rear vibratory motor. The rotating group on the end-cap side of the pump provides flow to the front vibratory motor.



Illustration 2g06609038
Vibratory Pump
(2) Port "M14"
(3) Front pump adjustment
(4) Front solenoid "C2"
(5) Port "AM3"
(6) Port "MB"
(7) Port "X7"
(8) Port MC
(9) Rear pump adjustment
(10) Rear solenoid "C1"
(11) Port "M14"
(12) Port "MD"
(13) Port "MA"
(14) Front solenoid "C1"
(15) Port "M5"
(16) Crossover relief valve for port "B"
(17) Charge relief valve
(18) Port "M4"
(19) Interlock solenoid
(20) Rear solenoid "C2"
(21) Port "L3"
(22) Port "M5"
(23) Port "C"
(24) Port "E"
(25) Port M4
(26) Port L1
(27) Port L2
(28) Port M3
(29) Crossover relief valve for port A
(30) Crossover relief valve for port D
(31) Crossover relief valve for port C
(32) Port D
(33) Port A
(34) Port B
(35) Servo piston
(36) Servo piston

Each port in the pump housing is identified by a numeric or an alpha-numeric designation which is cast into the housing next to the port. The function of each port is as follows:

  • Port "A" (33) is a system port. Port "A" is connected to port "B" of the rear vibratory motor. Port "A" is pressurized when the vibratory system is operating in low amplitude.

  • Port "B" (34) is a system port. Port "B" is connected to port "A" of the rear vibratory motor. Port "B" is pressurized when the vibratory system is operating in high amplitude.

  • Port "C" (23) is a system port. Port "C" is connected to port "B" of the front vibratory motor. Port "C" is pressurized when the vibratory system is operating in low amplitude.

  • Port "D" (32) is a system port. Port "D" is connected to port "A" of the front vibratory motor. Port "D" is pressurized when the vibratory system is operating in high amplitude.

  • Port "E" (24) is the charge inlet port. Filtered charge oil is directed into port "E".

  • Port "L1" (26) is a case drain port. Port "L1" is connected to port "T1" of the propel pump.

  • Port "L2" (27) is a case drain port. A check valve is installed in port "L2". The check valve directs oil from the pump case drain to the hydraulic tank when case pressure is greater than 1700 kPa (247 psi).

  • Port "L3" (21) is the main case drain port. Case drain oil from the vibratory hydraulic pump flows to the return manifold through port "L3".

  • Port "MA" (13) is a gauge port for the pressure at port "A".

  • Port "MB" (6) is a gauge port for the pressure at port "B".

  • Port "MC" (8) is a gauge port for the pressure at port "C".

  • Port "MD" (12) is a gauge port for the pressure at port "D".

  • Port "M3" (5) is a gauge port for charge pressure.

  • Port "M4" (18) and (25) are servo piston pressure ports. Each rotating group in the pump is equipped with a port labeled "M4". These ports are on opposites sides of the pump housing. Each of these ports is plugged. The pressure on one side of servo pistons (32) and (36) can be measured at port "M4". Port "M4" (25) on the shaft end of the pump housing can be used to measure servo pressure for the shaft end rotating group. This port is pressurized when the supply oil is directed out port "A" of the pump. Port "M4" (18) on the end-cap end of the pump housing can be used to measure servo pressure for the end-cap rotating group. This port is pressurized when the supply oil is directed out port "C" of the pump.

  • Port "M5" (15) and (22) are servo piston pressure ports. Each rotating group in the pump is equipped with a port labeled "M5". These ports are on opposites sides of the pump housing. Each of these ports is plugged. The pressure on one side of the servo piston can be measured at port"M5". Port "M5" (15) on the shaft end of the pump housing can be used to measure servo pressure for the shaft end rotating group. This port is pressurized when the supply oil is directed out port "B" of the pump. Port "M5" (22) on the end-cap end of the pump housing can be used to measure servo pressure for the end-cap rotating group. This port is pressurized when the supply oil is directed out port "D" of the pump.

  • Port "M14" (2) and (11) are on the direction control valves. Each rotating group in the pump is equipped with a port labeled "M14." Each of these ports is plugged. Case drain pressure is measured at port "M14".

  • Port "X7" (7) provides an external flow path for charge oil. Port "X7" is plugged on this pump.

Each rotating group contains its own direction control valve and servo piston. Each direction control valve is equipped with two EDCs. The EDCs are proportional solenoids. The function of each solenoid is as follows:

  • Solenoid "C1" (14) on the input-shaft end controls flow out port "A" of the pump. Solenoid "C1" is energized when the system is operating in low amplitude. This solenoid is connected to the pump electrical harness at connector "W-C15" and is labeled "Vibe Front Drum FRM".

  • Solenoid "C2" (4) on the input-shaft end controls flow out port "B" of the pump. Solenoid "C2" is energized when the system is operating in high amplitude. This solenoid is connected to the pump electrical harness at connector "W-C16" and is labeled "Vibe Rear Drum FRM".

  • Solenoid "C1" (10) on the end-cap end controls flow out port "C" of the pump. Solenoid "C1" is energized when the system is operating in low amplitude. This solenoid is connected to the pump electrical harness at connector "W-C14" and is labeled "Vibe MB".

  • Solenoid "C2" (20) on the end-cap end controls flow out port "D" of the pump. Solenoid "C2" is energized when the system is operating in high amplitude. This solenoid is connected to the pump electrical harness at connector "W-C13" and is labeled "Vibe MA".

The pump housing is equipped with charge relief valve (14). This valve is mechanically adjustable. The charge relief valve maintains charge pressure at 3000 ± 300 kPa (435 ± 43 psi).

Each rotating group of the vibratory pump is equipped with two crossover relief valves. The vibratory hydraulic system has a total of four crossover relief valves.

The location of each crossover relief valve is as follows:

  • Valve for port "A" (29)

  • Valve for port "B" (16)

  • Valve for port "C" (31)

  • Valve for port "D" (30)

The crossover relief valves act as makeup and relief valves. The makeup section of the valve allows charge oil to flow into the low-pressure side of the hydrostatic loop. This oil replenishes the oil lost to loop flushing and internal leakage. The relief section of the valve limits the maximum pressure in the high-pressure circuit to 42500 ± 2000 kPa (6164 ± 290 psi). The relief valve reacts quickly to pressure surges in the hydraulic system.

Each rotating group is equipped with pump adjustment screw (3) and (9). The pump adjustment screw is used to adjust the hydraulic zero setting of each rotating group. This adjustment aligns the swashplate and the direction control valve so that when the corresponding system is not operating, the swashplate in that rotating group is set to zero degrees.

The interlock valve is located inside the vibratory hydraulic pump. The machine ECM controls this solenoid-operated valve. When the engine start switch is in the ON position, solenoid (19) is energized.

Note: Battery power to energize the interlock solenoid transfers across the main power relay and through fuse "C7" on the switched fuse panel.

When interlock valve solenoid (19) is energized, charge oil is available at the direction control valve in each rotating group. If this solenoid is not energized, charge oil is blocked. In this case, the direction control valves are open to case drain. Under these conditions, the rotating groups of the vibratory hydraulic pump are at zero angle, and the vibratory system will not operate.



Illustration 3g06609062
Main Hydraulic Pump
(32) Servo piston
(36) Servo piston
(37) Feedback link
(38) EDC
(39) EDC
(40) Feedback link
(41) Servo springs
(42) Swashplate
(43) Slipper pad
(44) Piston)
(45) Rotating group (for front vibratory motor)
(46) Rotating group (for rear vibratory motor)
(47) Piston
(48) Input shaft
(49) Slipper pad
(50) Swashplate
(51) Servo springs

Engine rotation turns pump input shaft (48). The input shaft rotates rotating group (46) for the rear vibratory motor and rotating group (45) for the front vibratory motor. The rotating groups contain a piston and barrel assembly. Pistons (47) and (44) in the groups rotate with the barrel assembly. Piston slipper pads (49) and (43) allow the pistons to follow the angle of swashplates (50) and (42). The rotating groups only generate flow when their swashplates are not at zero angle.

When the machine electronic control system sends an output signal to EDC (38) or (39), corresponding servo piston (32) or (36) moves. As the servo piston moves, the action of the control linkage causes the angle of swashplates (42) or (50) to change. The swashplate angle is proportional to the signal from the machine electronic control system.

Slipper pads (43) and (49) in each rotating group (45) and (46) follow the angle of swashplates (42) and (50). This action causes pistons (44) and (47) to move in and out of the barrel assembly as input shaft (48) rotates. As a piston moves out of the barrel assembly, oil in the low-pressure circuit is drawn into the piston chamber. As a piston moves into the barrel assembly, oil is forced out of the piston chamber and into the high-pressure circuit.



Illustration 4g06609816
Crossover Relief Valves, LowPressureand High Pressure Operation
(52) Relief poppet
(53) Check valve
(54) Relief spring
(55) Makeup spring

Oil in the high pressure side of the closed-circuit loops acts to close check valve (53). Oil in the low pressure (return) side of the closed circuit loop acts to open the check valve. Flushing and internal leakage cause pressure in the return side of the closed circuit to decrease. This decrease causes charge pressure to unseat the check valve. When the pressure in the return circuit is low enough, the check valve moves the main relief cartridge against the force of makeup spring (55). The check valve opens a passage for charge oil to flow into the return side of the circuit. Charge oil replenishes the oil that the circuit looses from flushing and internal leakage.

Pressure in the high-pressure circuit acts to open relief poppet (52). The combined force from the oil in the charge circuit and relief spring (54) acts to close the relief poppet. When the pressure in the high-pressure circuit reaches the relief setting, the relief poppet compresses the relief spring. In this case, oil from the high-pressure circuit is directed into the charge circuit.



Illustration 5g06609824
Left Side of Machine
(56) Arc suppressor

Interlock solenoid (19) has associated arc suppressor (56) in a parallel circuit. This component is in the pump compartment. The door on the left side of the machine provides access to the arc suppressor.

Arc suppressor (56) provides a current path for the inductive energy in the coil of interlock solenoid (19). This path prevents an arc from forming across the main power relay as the interlock solenoid de-energizes.

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