Part of the Yanmar Repair Manuals.
Need factory-level data for your Yanmar ViO50-6B compact excavator? This 702-page service manual (OEM #MMB44ENMA00101) covers both the ViO50-6B and Vi050-6B, from engine teardown to hydraulic system rebuild. Inside: full hydraulic circuit schematics tracing every line from pump to cylinder, plus seat mount, engine, and cabin wiring diagrams for a complete electrical picture. You also get page after page of torque tables, step-by-step pressure adjustment procedures for relief and cut-off valves, error codes with diagnostic detail, and a troubleshooting section that addresses real field problems including thermal shock of the travel motor and discontinuous arm movement. Set P1/P2 system relief to 24.5 MPa at 30 L/min, and torque your 1/4 G hydraulic hose fittings to 24.5–28.5 N·m before you button anything up. No more guessing at pressures with a chart from a different machine. Bookmarked by section and keyword-searchable; pull it up on your tablet right at the excavator and get back to work.
Complete the set for your ViO50-6B
- Parts Catalog: Yanmar VIO50-6B excavator (crawler back-hoe) Parts Catalog
What's Inside This Yanmar ViO50-6B Manual
| System | Pages | Key Topics |
|---|---|---|
| 2-5 Specifications for Attachment | 15 | Dimensions, Oil Pressure Specifications, Hydraulic Pump Discharge Volume, Set Pressure of System Relief Valve, Set Pressure of Bucket Circuit Relief Valve |
| 2-6 Periodic Inspection and Servicing | 15 | General Inspections, Hydraulic Circuit, Greasing Points, Chassis, Electrical Equipment, Engine |
| 2-7 Fuel, Lube Oil and Grease Recommended | 16-33 | Thermal Engine Oil, Travel Gears Box Oil, Hydraulic Circuit Oil, Fuel Tank Diesel, Cooling System Fluid |
| 2-8 Hydraulic Circuit Schematic | 34 | Swing Motor, Travel Motor, Control Valve, Hydraulic Oil Tank, Hydraulic Cylinders, Swivel Joint |
| 2-9 Wiring Diagram | 35-39 | Seat Mount Harness, Engine Harness, Cabin Wiring, Air Conditioner Wiring, Heater Wiring, Work Lamp Wiring |
| 3-8 Pressure Adjustment | 40-76 | Relief Valves, System Relief Valve, Circuit Relief Valve, Swing Brake Valve, Cut-Off Valve, Pressure Change |
| 4-1 Safety | 77-90 | Safety Statements, Safety Precautions, High Pressure Hazard, Scald Hazard, Explosion Hazard, Crush Hazard |
| 4-2 Engine | 91-148 | Special Service Tools, Measuring Instruments, Cylinder Head Components, Crankshaft Components, Camshaft Components, Timing Components |
| 4-3 Fuel System | 149-161 | System Structure, Fuel System Specifications, Fuel System Diagram, Fuel System Components, Common Rail, Injector |
| 4-4 Cooling System | 162-169 | Cooling System Diagram, Engine Coolant Pump Components, Engine Coolant System Check, Temperature Switch, Thermostat, Radiator Cap |
| 4-5 Lubrication System | 170-175 | Lubrication System Diagram, Checking Engine Oil Pressure, Oil Pump Components, Disassembly of Oil Pump, Cleaning and Inspection, Reassembly of Oil Pump |
| 4-6 Starter Motor | 176-189 | Starter Motor Specifications, Starter Motor Troubleshooting, Starter Motor Components, Disassembly of Starter Motor, Cleaning and Inspection, Reassembly of Starter |
| 4-7 Alternator | 190-200 | |
| 4-8 Electronic Control System | 201-237 | |
| 4-9 Electric Wiring | 238 | |
| 4-10 Failure Diagnosis | 239-242 | |
| 4-11 Troubleshooting | 243-250 | Non-Breakdowns (Natural Release of Bucket, Discontinuous Arm Movement, Drifting of Upperstructure on Quick Travel Operation, Thermal Shock of Travel Motor, Elongation of Boom Swing Cylinder on 68 Degrees Swing, Time Lag on Travel Speed Switching, Fluctuation in Oil Level of Hydraulic Oil Tank Due to Temperature Change) |
| 5-1 Electric Equipment of Machine | 251-287 | Parts Layout of Electrical Equipment, LCD Monitor and Alarm Systems |
| 6-6 Swing Motor | 288 | Structure and Functions, Theory of Operation, Reduction Gear, Disassembly and Reassembly, Service Standards, Troubleshooting |
| 6-8 Proportional Solenoid Valve for P.T.O | 289-523 | Main Components, Specifications, Theory of Operation, Disassembly and Reassembly, Troubleshooting |
| 7-5 Hydraulic Equipment | 524 | Hydraulic Pump, Control Valve, Pilot Valves (L and R), Swing Motor, Swivel Joint, Hydraulic Cylinder |
| 7-7 Cabin | 524 | Removal and Reinstallation of Cabin, Disassembly and Reassembly of Cabin, Glass (Sash) Replacement, Installation of Interior Parts, Installation of Front Door |
| 7-8 Air Conditioner | 525-702 | Removal and Reinstallation of Air Conditioner, Removal of A/C (Heater) Unit, Removal of A/C Condenser, Removal of Compressor, Components, Air Conditioner Specifications |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Pressure oil gauge capacity | 49.0 MPa | p. 68 |
| System relief set pressure (P1, P2) | 24,5 MPa at 30 L/min | p. 68 |
| Crawler tension adjustment (Rubber Track) | H: 5 to 10 mm | p. 100 |
| Tightening torque for hydraulic hose (1/8 G (PF)) | 12 to 14 N·m | p. 102 |
| Tightening torque for hydraulic hose (1/4 G (PF)) | 24,5 to 28,5 N·m | p. 67 |
| Tightening torque for parallel pipe thread (1/8 G (PF)) | 24,5 to 28,5 N·m | p. 67 |
| Tightening torque for parallel pipe thread (1/4 G (PF)) | 38 to 42 N·m | p. 67 |
| Crankshaft oil seal replacement | Apply a continuous bead of ThreeBond Liquid Gasket No. 1207F, YANMAR Part No. 977770-1207F to the outside diameter of a new oil seal | p. 125 |
| Oil pickup tube O-ring replacement | Reinstall the oil pickup tube (Figure 4-2-102, (1)) using a new O-ring (Figure 4-2-102, (2)). | p. 139 |
| Fuel filter filtration area | 2000 cm² | p. 23 |
| Air filter replacement interval (dusty atmosphere) | every 250 h | p. 31 |
| LO filter filtration area | 1160 cm² | p. 23 |
