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Help CenterFor CAT E385C E390D Main Hydraulic Pump Assembly 334-9990, 335-0029, 155-9205, or 10R-6269
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For CAT E385C E390D main hydraulic pump assembly 334-9990, 335-0029, 155-9205, or 10R-6269
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E-mail : Aimee@perkins-rx.com
The hydraulic system of an excavator serves as its core component for power transmission and control. It is responsible for converting the mechanical energy from the engine into hydraulic energy, and precisely driving various actuators to perform actions such as excavation, turning, and traveling. The following are the main components of the hydraulic system of an excavator, categorized by functional modules:
1. [Power element] - converts mechanical energy into hydraulic energy
1. Main Hydraulic Pump
- Mostly variable displacement piston pumps (swash plate or swash shaft type) are used, which output high-pressure oil to drive the working device and travel/rotation.
- Common configuration: dual pumps (main pump 1 + main pump 2) + pilot pump.
2. Pilot Pump
- A small gear pump provides a stable low-pressure oil source for controlling the displacement of the main valve spool through the joystick.
3. Hydraulic Oil Tank
- Store, cool, and precipitate hydraulic oil, equipped with a level gauge, air filter (breather), and return oil filter screen.
II. [Control Components] - Regulating Pressure, Flow Rate, and Direction
4. Main Control Valve (also known as Distribution Valve)
- Integrate multiple valve couplings to control various actions:
- Boom valve
- Arm valve
- Bucket valve
- Swing valve
- Travel valve
- Confluence/priority valve (such as boom priority)
5. Pilot Control Valve (Pilot Control Valve / Handle)
- The handle in the cab controls the movement of the main valve core through a pilot oil pressure signal, achieving "gentle operation".
6. Pressure control valve
- Main Relief Valve: Limits the maximum pressure of the system to prevent overload.
- Secondary overflow valve: protects specific circuits (such as rotation and travel).
- Unloading valve: Energy-saving design, reducing pump displacement when not in operation.
7. Auxiliary valves such as check valves, throttle valves, and shuttle valves
- Used for logic control, anti-reversal, speed regulation, etc.
III. [Actuator] - Converting hydraulic energy into mechanical motion
8. Hydraulic Cylinders
- Boom cylinder
- Bucket cylinder
- Bucket cylinder
- Bulldozer blade cylinder (if present)
9. Hydraulic Motors
- Slewing Motor: Drives the upper platform to rotate.
- Travel Motor: One on each side, driving the track to travel (usually integrated with a brake and a reducer).
IV. [Auxiliary Components] - Ensuring System Cleanliness, Cooling, and Connectivity
10. Hydraulic filters (Filters)
- Oil suction filter (coarse filter, protecting the pump)
- Oil return filter (fine filtration, removing system contaminants)
- Pilot oil filter (protecting the control valve)
- High-pressure filter (used in critical circuits for some models)
11. Hydraulic oil radiator (Oil Cooler)
- Air-cooled (fan + radiator) or water-cooled to prevent excessive oil temperature (>80℃ will accelerate oil deterioration).
12. Accumulator
- Store the pilot pressure to ensure that the safety lock (such as travel brake) can still be released after flameout.
13. Hydraulic pipeline system
- High-pressure hose (SAE 100R series, pressure-resistant 35–40 MPa)
- Steel pipe/hard tube (fixed part, high temperature resistant and vibration resistant)
- Quick connector (easy to assemble and disassemble)
14. Seals and connectors
- O-rings, Gland rings, Stromberg seals, etc., used for sealing in oil cylinders, valve blocks, and pump bodies.
V. [Monitoring and Safety Devices]
15. Sensor
- Hydraulic oil temperature sensor
- System pressure sensor (for some smart models)
- Filter clogging alarm switch
16. Safety lock valve / Brake valve
- The travel motor is equipped with a built-in wet multi-disc brake, which automatically locks when the machine is stopped.
- Rotary brake/buffer valve to prevent inertial sliding of the platform.
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