Yanmar B50-2B, B50-2BUS Excavator Service Manual

Description

• Model List:
  • B50-2B, B50-2BUS Excavator

• 1. B50-2B(US)
• 2. FOREWORD
• 3. CONTENTS
• 4. GENERAL CAUTIONS FOR MAINTENANCE WORK
• 4.1. Correct Work
• 4.2. Safety Precautions
• 4.3. Preparations
• 4.4. Cautions for Disassembly and Reassembly
• 4.5. Cautions for Attaching and Detaching Hydraulic Equipment
• 4.6. Cautions for Attaching and Detaching Hydraulic Piping
• 4.7. Cautions for Handling Seals
• 4.8. Correct Installation of Hydraulic Hose
• 4.9. Specifications of Hydraulic Hose
• 4.10. Air-Venting of Hydraulic Equipment
• 5. TECHNICAL DATA
• 5.1. Specifications
• 5.2. External Drawings and Working Ranges
• 5.2.1. Canopy Type Specifications
• 5.2.2. Cabin Type Specifications
• 5.3. Weight of Main Parts
• 5.4. Lifting Capacities
• 6. SERVICING STANDARDS
• 6.1. Machine Performance
• 6.2. Engine
• 6.3. Undercarriage
• 6.3.1. Rubber Track Specifications
• 6.3.2. Steel Track Specifications
• 6.3.3. Steel Rubber Track Common Specifications
• 6.4. Control Devices
• 6.5. Hydraulic Equipment
• 6.5.1. Hydraulic Cylinder
• 6.6. Work Implement
• 6.6.1. Front Attachment
• 6.6.2. Blade Moving Device
• 6.6.3. Bucket Teeth
• 6.7. Torque Specifications
• 6.7.1. Machine
• 6.7.2. Engine
• 6.7.3. Tightening Torque of General Bolts and Nuts
• 7. ENGINE
• 7.1. Measurement,Inspection and Adjustment
• 7.1.1. Measuring the Compression Pressure
• 7.1.2. Adjustment the Valve Head Clearance
• 7.1.3. Checking the V-belt Tension
• 7.1.4. Checking the Fuel Injection Valve
• 7.1.5. Checking and Adjustment the Fuel Injection Timing
• 7.1.6. Adjustment the No-load Maximum(or Minimum) Revolutions
• 7.1.7. Checking the Cooling Water System and Radiator for Water Leakage
• 7.1.8. Checking the Sensors
• 7.2. Measuring Process,Service Data and Corrective Action
• 7.2.1. Cylinder Head
• 7.2.2. Cylinder Block
• 7.2.3. Valve Rocker Arm
• 7.2.4. Pistons and Piston Ring
• 7.2.5. Connecting Rod
• 7.2.6. Camshaft
• 7.2.7. Crankshaft
• 7.2.8. Gears
• 7.2.9. Trochoid Pump
• 7.3. Precautions Reassembly
• 7.4. Fuel Supply System
• 7.4.1. Fuel Injection Pump
• 7.4.2. Fuel Feed Pump
• 7.4.3. Fuel System
• 7.4.4. Fuel Injection Valve
• 7.4.5. Governor Machanism
• 7.4.6. Specification of Fuel Injection Pump
• 7.4.7. Service Data for Fuel Injection Equipment
• 7.5. Electrical Equipment
• 7.5.1. Starting Motor
• 7.5.2. Alternator
• 7.5.3. Air Heater
• 8. HYDRAULIC SYSTEM
• 8.1. Outline
• 8.1.1. Control Valve Operation
• 8.1.2. Additional Operation of Control Valve
• 8.2. Hydraulic Circuit Schematic(with P.T.O. Selector Valve)
• 8.3. Circuit Operation
• 8.3.1. Boom
• 8.3.2. Arm
• 8.3.3. Bucket
• 8.3.4. Swing
• 8.3.5. Boom Swing
• 8.3.6. Blade
• 8.3.7. Travel
• 8.3.8. Simultaneous Operation of Travel and Boom/Bucket
• 8.3.9. Simultaneous Operation of Travel and Arm/Boom Swing
• 8.3.10. Simultaneous Operation of Boom Up and Arm Retract
• 8.3.11. Simultaneous Operation of Boom Up and Bucket
• 8.3.12. Simultaneous Operation of Boom Up and Swing
• 8.3.13. Simultaneous Operation of Arm and Bucket
• 8.3.14.
• 8.4. Pressure Adjustment
• 8.4.1. Relief Valves
• 8.4.2. Swing Brake Valves
• 8.4.3. Cut-off Valve
• 9. HYDRAULIC EQUIPMENT
• 9.1. Hydraulic Pump
• 9.2. Control Valve
• 9.3. Pilot Valve
• 9.4. Swing Motor
• 9.5. Travel Motor
• 10. ADJUSTMENT PROCEDURES FOR EACH EQUIPMENT
• 10.1. Electeic Equipment of the Machine
• 10.1.1. Arrangement of Electrical Equipment and Names of Parts
• 10.1.2. Monitor and Alarm Systems
• 10.1.3. Wiring Diagram
• 10.2. Undercarriage
• 10.2.1. Outline
• 10.2.2. Major Parts
• 10.2.3. Cautions for Reassembly(Rubber Track Models)
• 10.2.4. Cautions for Reassembly(Steel Track Models)
• 10.2.5. Disassembly and Reassembly of Idler
• 10.2.6. Disassembly and Reassembly of Track Roller
• 10.2.7. Disassembly and Reassembly of Carrier Roller
• 10.2.8. Drawings of Jigs
• 10.3. Controls
• 10.3.1. Control Train
• 10.3.2. Disassembly and Reassembly of Mechanical Control Linkage
• 10.3.3. Adjustment of Implements and Swing Control Levers
• 10.3.4. Adjustment of Travel Levers
• 10.3.5. Adjustment of 2-Speed Pedal
• 10.3.6. Adjustment of Boom Swing Pedal
• 10.3.7. Adjustment of Blade Lever
• 10.3.8. Adjustment of Lock Lever
• 10.3.9. Adjustment of Engine Speed Control
• 10.4. Swing System
• 10.4.1. Swing Bearing
• 10.4.2. Hydraulic Equipment
• 10.4.2.1. Precautions for Removal and Installation, and Assembly of Hydraulic Pump
• 10.4.2.2. Disassembly and Reassembly of Hydraulic Cylinder
• 10.4.2.3. Swivel Joint
• 10.4.2.4. Hydraulic Oil Tank
• 10.4.2.5. Hydraulic Piping Layout
• 11. PERIODIC INSPECTION AND SERVICING
• 11.1. List of Periodic Inspection and Servicing
• 12. FUEL,LUBE OIL AND GREASE RECOMMENDED
• 12.1. Fuel, Lube Oil and Grease Recommended by Yanmar
• 12.2. Cooling Water Recommended by Yanmar
• 13. TROUBLESHOOTING
• 13.1. Non-breakdowns
• 13.1.1. Natural Release of Bucket
• 13.1.2. Discontinuous Arm Movement
• 13.1.3. Drifting of Upperstructure Quick Travel Operation
• 13.1.4. Thermal Shock of Travel Motor
• 13.1.5. Elongation of Boom Swing Cylinder on 90 degrees Swing
• 13.1.6. Telescopic Motion of Boom Swing Cylinder with lock Lever in LockPosition
• 13.1.7. Time Lag on Switching travel Speed
• 13.1.8. Hydraulic oil Tank Oil Level Fluctuation Through Temperature Change
• 13.2. Troubleshooting
• 13.2.1. Machine and Engine
• 13.2.2. Electrical Equipment on Panel
• 13.3. REFERENCE DATA
• 13.3.1. Specifications for Attachment