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The Komatsu WB140PS-2N and WB150PS-2N are backhoe loaders designed for a variety of construction and earthmoving tasks. This shop manual provides comprehensive information for their service and repair, ensuring safe and effective operation and maintenance.
These machines are primarily used for digging, loading, and material handling. The backhoe attachment at the rear is designed for excavation, while the loader at the front is used for scooping and transporting materials. The power train system, including the engine, torque converter, and transmission, efficiently transmits power to both the front and rear axles, enabling robust performance. The hydraulic system, driven by a hydraulic pump, powers the various work equipment, including the loader and backhoe cylinders, steering unit, and other attachments.
The power flow within the machine begins with the engine, which transmits power through the flywheel to the torque converter. The torque converter, utilizing hydraulic oil, converts this engine torque into driving power, which is then sent to the transmission and the hydraulic pump. The transmission, equipped with hydraulically activated clutches and an electrically controlled gear selector, offers four forward and four reverse speeds. This allows for precise control over the machine's movement and power delivery. From the transmission, power is distributed to the front and rear axles via drive shafts. The differentials in both axles further reduce the power, which is then transmitted to the planetary gears, ultimately driving the wheels.
The hydraulic system is crucial for the operation of the work equipment. The hydraulic pump, driven by the engine, generates the necessary pressure to actuate the loader and backhoe cylinders. The loader valve, available in 2-spool or 3-spool configurations, controls the movement of the loader boom, arm, and bucket. Similarly, the backhoe control valve, with both mechanical and excavator control options, manages the backhoe boom, arm, and bucket, as well as the telescopic arm cylinder, swing, and outriggers. The CLSS (Closed-center Load Sensing System) further enhances hydraulic efficiency by adjusting pump output based on load demand, ensuring smooth and precise control while minimizing energy waste. This system includes components like the PC valve, LS valve, servo piston, unloading valve, and priority valve, all working in concert to optimize hydraulic performance.
The WB140PS-2N and WB150PS-2N models share many specifications, with key differences in engine power and torque, reflecting their respective performance capabilities.
The WB140PS-2N and WB150PS-2N are designed for operator comfort and control. The PPC (Proportional Pressure Control) joystick system allows for precise and effortless control of the backhoe and loader functions. Separate PPC joysticks for left and right valves, along with a solenoid valve, enable fine-tuned movements. Features like differential lock and backhoe boom lock enhance stability and operational safety. The telescopic arm and hammer functions further expand the versatility of the backhoe, allowing for specialized tasks. The steering unit provides responsive control, while the air conditioning system ensures operator comfort in various environmental conditions. Quick disconnect couplers are provided for hydraulic lines, allowing for efficient attachment changes and maintenance. These couplers are available in different types, each with specific disconnection and connection procedures to ensure secure and leak-free operation.
The manual emphasizes the importance of proper service and repair for safe operation. It outlines general safety precautions, including wearing appropriate safety gear, ensuring a clean work area, and using correct tools. Preparations for work involve parking on level ground, blocking wheels, lowering work equipment, and locking controls. During work, precautions include slowly releasing pressure from hydraulic systems, allowing hot fluids to cool, disconnecting battery leads (negative first), and using hoists for heavy components.
The manual provides detailed information on standard tightening torques for bolts, nuts, hose nuts, split flange bolts, and flared nuts, which is critical for ensuring the structural integrity and proper function of the machine. It also includes a comprehensive list of recommended coating materials, such as adhesives, sealants, and lubricants, with their specific applications and features. This ensures that the correct materials are used for repairs and maintenance, contributing to the longevity and reliability of the components. The classification of electric wires by thickness and color code aids in troubleshooting and repairing electrical systems. Conversion tables for various units (millimeters to inches, kilograms to pounds, N•m to lbf.ft, N•m to lbf.inf, liters to gallons, and temperature conversions) are also provided to assist technicians with measurements and calculations. Regular checks and adjustments, as detailed in the "Testing, Adjusting and Troubleshooting" section, are crucial for maintaining optimal performance and identifying potential issues early. The "Disassembly and Assembly" section provides step-by-step instructions for removing and installing components, ensuring that repairs are carried out correctly and safely.
General| Brand | Komatsu |
|---|---|
| Model | WB140PS-2N |
| Category | Front End Loaders |
| Language | English |
