CCS9 Combination Vibratory Compactor Propel Systems Caterpillar


Piston Pump (Propel)

Usage:

CCS9 C52


Illustration 1g06130898
Under Operator Platform
(1) Propulsion pump

Propulsion pump (1) is located under the operator platform. This pump is driven by the engine. The engine compartment provides limited access to this component.

Propulsion 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 closest to the engine provides flow to the axle motor. The second rotating group provides flow to the drum motor.



Illustration 2g06131290
Propulsion Pump
(1) Port"M14"
(2) Control adjustment
(3) Axle reverse solenoid "C2"
(4) Port"M3"
(5) Port"MB"
(6) Port"X7"
(7) Port"MC"
(8) Control adjustment
(9) Drum forward solenoid "C1"
(10) Port"M14"
(11) Port"MD"
(12) Port"MA"
(13) Axle forward solenoid "C1"
(14) Axle port"M5"
(15) Combination valve for port"B"
(16) Charge relief valve
(17) Drum port"M4"
(18) Sequence valve solenoid
(19) Drum reverse solenoid "C2"
(20) Port"L3"
(21) Drum port"M5"
(22) Port"C"
(23) Port"E"
(24) Axle port"M4"
(25) Port"L1"
(26) Port"L2"
(27) Port"M3"
(28) Combination valve for port"A"
(29) Combination valve for port"D"
(30) Combination valve for port"C"
(31) Port"D"
(32) Port"A"
(33) Port"B"

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" (32) is a system port. Port"A" is the forward pressure port for the axle drive system.

  • Port"B" (33) is a system port. Port"B" is the reverse pressure port for the axle drive system.

  • Port"C" (22) is a system port. Port"C" is the forward pressure port for the drum drive system.

  • Port"D" (31) is a system port. Port"D" is the reverse pressure port for the drum drive system.

  • Port"E" (23) is the charge inlet port. Filtered charge oil is directed into port"E".

  • Port"L1" (25) is a secondary case drain port. Case drain oil from the axle section of the propulsion pump flows through a 5.0 mm (0.2 in) orifice fitting to the thermal bypass manifold. This orifice helps maintain case pressure on the shift seal within limits. Since the charge relief valve dumps oil in to the axle section, the orifice fitting in the axle case drain helps to balance the case drain flow from the axle section and the drum section. Excess case drain oil in the axle section flows to the drum section. This configuration allows excess flow to purge while still providing adequate flow to the drum section for flushing.

  • Port"L2" (26) is a case drain port. Port"L2" is plugged.

  • Port"L3" (20) is the main case drain port. Case drain oil from the drum section of the propulsion pump flows to the thermal bypass manifold through port"L3". Most case drain oil from the pump flows through this port.

  • Port"MA" (12) is a gauge port for axle forward pressure. A hose connects port"MA" on the pump to port"MA" on the test manifold.

  • Port"MB" (5) is a gauge port for axle reverse pressure. A hose connects port"MB" on the pump to port"MB" on the test manifold.

  • Port"MC" (7) is a gauge port for drum forward pressure. A hose connects port"MC" on the pump to port"MC" on the test manifold.

  • Port"MD" (11) is a gauge port for drum reverse pressure. A hose connects port"MD" on the pump to port"MD" on the test manifold.

  • Port"M3" (27) is a charge pressure port. Port"M3" is plugged on the propulsion pump. Charge pressure is measured at the tap in the base of the charge filter.

  • Drum port"M4" (17) and axle port"M4" (24) are plugged. Each rotating group in the pump is equipped with a port labeled"M4". These ports are on opposites sides of the pump housing. The pressure on one side of the servo piston can be measured at port"M4". Axle port"M4" (24) on the shaft end of the pump housing can be used to measure forward servo pressure for the axle rotating group. Drum port"M4" (17) on the end-cap end of the pump housing can be used to measure forward servo pressure for the drum rotating group.

  • Axle port"M5" (14) and drum port"M5" (21) are plugged. Each rotating group in the pump is equipped with a port labeled"M5". These ports are on opposites sides of the pump housing. The pressure on one side of the servo piston can be measured at port"M5". Axle port"M5" (14) on the shaft end of the pump housing can be used to measure reverse servo pressure for the axle rotating group. Drum port"M5" (21) on the end-cap end of the pump housing can be used to measure reverse servo pressure for the drum rotating group.

  • Port"M14" (1) and (10) are plugged. Each rotating group in the pump is equipped with a port labeled"M14". These ports are on the direction control valves. Case drain pressure can be measured at each port"M14".

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

  • Axle forward solenoid"C1" (13) controls forward operation of the axle rotating group.

  • Axle reverse solenoid"C2" (3) controls reverse operation of the axle rotating group

  • Drum forward solenoid"C1" (9) controls forward operation of the drum rotating group.

  • Drum reverse solenoid"C2" (19) controls reverse operation of the drum rotating group.

Note: On the electrical schematic and on the machine wiring harness, the solenoids are labeled differently than described above. Axle forward solenoid"C1" is labeled axle solenoid"A". Axle reverse solenoid"C2" is labeled axle solenoid"B". Drum forward solenoid"C1" is labeled drum solenoid"A". Drum reverse solenoid"C2" is labeled drum solenoid"B".

The propulsion pump housing is equipped with charge relief valve (16). This valve is mechanically adjustable. This charge relief valve directs hydraulic oil to the axle side of the pump case. Inside the pump case, this oil then flows through a drilled passage in the center pump housing. Excess oil flows from the axle section case to the drum section case. Oil in the drum section case flows out port"L3" to the return manifold.

The charge relief valve in the propulsion pump and the charge relief valve in the vibratory pump work in conjunction. The charge relief valve in the vibratory pump has a lower relief setting than the valve in the propulsion pump. Flow through the valve in the vibratory pump is limited by an orifice.

These valves maintain charge pressure at 2520 ± 200 kPa (365 ± 29 psi) at a low idle engine speed of 1200 rpm. Under normal operating conditions, the system directs 13 ± 2 L/m (3.4 ± 0.5 gpm) of flow to the charge inlet port of the vibratory pump. The remainder of the flow is directed through the case of the propulsion pump.

Each rotating group of the propulsion pump is equipped with two combination valves. The relief section of the valves limits the pressure in the circuit to 35 500 ± 1000 kPa (5150 ± 145 psi) at a low idle engine speed of 1200 rpm. The makeup section of the valves allows charge oil to flow into the low-pressure circuit (return side of loop) to replenish the oil lost to internal leakage and loop flushing.

The function of each combination valve is as follows:

  • Combination valve (28) for port"A" controls the pressure in the forward loop of the axle circuit.

  • Combination valve (15) for port"B" controls the pressure in the reverse loop of the axle circuit.

  • Combination valve (30) for port"C" controls the pressure in the forward loop of the drum circuit.

  • Combination valve (29) for port"D" controls the pressure in the reverse loop of the drum circuit.

Each rotating group is equipped with control null adjustment screw (2) and (8). The control adjustment screw is used to adjust the hydraulic zero setting of the rotating group. This adjustment aligns the swashplate and the direction control valve. When the propulsion system is not operating, the swashplate in both rotating groups is set to zero degrees.

Sequence valve solenoid (18) is on the propulsion pump. The machine ECM controls this solenoid. When the parking brake is engaged, this solenoid is not energized. When the parking brake is released, the sequence valve solenoid is energized.

When sequence valve solenoid (18) is energized, charge oil is available at the direction control valve in each rotating group. Charge oil is also sent to the parking brakes. When the solenoid is not energized, charge oil is blocked. In this case, the direction control valves and the parking brakes are open to case drain. Under these conditions, the rotating group in each pump is at zero angle, and the parking brakes are engaged.



Illustration 3g06131305
Propulsion Pump
(34) Servo springs
(35) Swashplate
(36) Slipper pad
(37) Feedback link
(38) EDC
(39) Servo piston
(40) Servo piston
(41) Feedback link
(42) EDC
(43) Servo springs
(44) Swashplate
(45) Slipper pad
(46) Piston
(47) Rotating group
(48) Piston
(49) Rotating group
(50) Input shaft

Engine rotation turns pump input shaft (50), which then rotates two rotating groups (47) and (49). The rotating groups contain a piston and barrel assembly. Pistons (46) and (48) in the groups rotate with the barrel assembly. Piston slipper pads (36) and (45) allow the pistons to follow the angle of swashplates (35) and (44). The rotating groups only generate flow when the swashplates are not at zero angle.

When the machine electronic control system sends an output signal to EDC (38) or (42), corresponding servo piston (39) or (40) moves. As the servo piston moves, the action of the control linkage causes the angle of swashplates (35) or (44) to change. The swashplate angle is proportional to the signal from the machine electronic control system.

Slipper pads (36) and (45) in each rotating group (47) and (49) follow the angle of swashplates (35) and (44). This action causes pistons (46) and (48) to move in and out of the barrel assembly as input shaft (50) 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 4g06131359
Combination Valves
(51) Relief poppet
(52) Check valve
(53) Relief spring
(54) Makeup spring

Oil in the high-pressure side of the closed-circuit loops acts to close check valve (52). 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 (54). 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 (51). The combined force from the oil in the charge circuit and relief spring (53) 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.

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