Kubota U20-3 / U25-3 excavator, repair e-manual

Content

General

• Body and engine identification marks
• Safety precautions for servicing, disassemble and reassembly
• Important safety process and critical functional process
• Important inspection items after reassembling
• Servicing fundamentals
• Maintenance intervals

Machine body

• Specifications
• Components interchangeability
• Machine structure
• Specifications
• Machine weight
• Machine specifications
• Lever stroke and operating force
• Dimensions of parts
• Front attachment
• Parts designation
• Exchange of bucket
• Installing of dust seal and thrust collar
• Installation of pin and bush
• Front hose
• Upper structure
• Lever and pedal
• Hydraulic oil tank
• Fuel tank and hose
• Counterweight
• Cab canopy installation
• Installing the cabin or canopy
• Under carriage
• Swivel bearing
• Grease tube
• Track tension device
• Upper roller and track roller
• Variable track (U20-3)
• Crawler replacement and tension adjustment

Engine

• Engine specifications for construction machinery
• Dimensions
• Feature
• Engine body
• Cylinder block
• Cylinder head
• Crankshaft
• Piston and piston rings
• Connecting rod
• Rocker arm
• Camshaft
• Fuel camshaft
• Flywheel
• Lubricating system
• Oil pump
• Relief valve
• Oil filter cartridge
• Oil pressure switch
• Cooling system
• Water pump
• Thermostat
• Radiator (not included in the basic engine)
• Radiator cap
• Intake / exhaust system
• Air cleaner (not included in the basic engine)
• Muffler (not included in the basic engine)
• Fuel system
• Injection pump
• Injection nozzle
• Fuel filter (not included in the basic model)
• Governor
• Automatic advance timer (not included in the basic model)
• Electrical system
• Charging system
• Turbo charger system

Hydraulic system

• Features of hydraulic system
• Hydraulic system specifications
• Main pump
• Strueture and specifications
• Performance curve
• Operating principle
• Contrel valve
• Specifications
• General view of control valve
• Sectional view
• Arm regeneration circuit
• Boom anti-fall valve
• Straight travel circuit
• Simultaneous operation of boom and bucket
• Relief valve / anti-cavitation valve
• Automatic air bleeding in hydraulic pilot section
• Pilot valve
• Structure and specifications
• Pilot valve control diagram
• Functions
• Swivel motor
• Function of negative brake
• Rotary joint (Swivel joint)
• Travel motor U20-3 (Fujikoshi)
• U25-3 (Kayaba)
• Operating principle of counter valance valve
• Function of Hi-Lo change
• Function of reduction gear
• Function of anti-cavitation valve
• Hydraulic circuit diagram
• U20-3 Fixed undercarriage
• U20-3 Retractable undercarriage
• U25-3
• Hydraulic components layout
• Troubleshooting
• Specifications
• Testing
• Disassembling and assembling

Electrical system

• Components and harness layout
• Function of main circuit
• Battery circuit
• Safety relay circuit
• Fuel control circuit
• Engine oil pressure sensor circuit
• Hom circuit
• Cab and working lamp circuit
• Meter panel
• Heater circuit
• Travel hi-speed control circuit
• Wire harness installation
• Troubleshooting

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