All 663 pages of this Yanmar ViO50-6A Service Manual focus on one machine: your compact tail-swing excavator, rebuilt to factory condition. You get the complete hydraulic circuit schematic with fluid routing across every actuator circuit, full wiring diagrams spanning engine ECU operation, auto deceleration, and eco mode logic, plus an error code list and a detailed troubleshooting section covering LCD monitor alarms, starter motor faults, and proportional solenoid valve diagnostics. Torque the swing bearing-to-track frame bolts to 291 to 339 N·m with Loctite 262, then fill the engine to 7.4 L before startup. No more chasing hydraulic faults with a pressure gauge and a guess. Bookmarked by section, keyword-searchable throughout. Grab your tablet, walk to the machine, and start wrenching.
What's Inside This Yanmar ViO50-6A Manual
| System | Pages | Key Topics |
|---|---|---|
| 2-5 Specifications for Attachment | 15 | - |
| 2-6 Periodic Inspection and Servicing | 15 | - |
| 2-7 Fuel, Lube Oil and Grease Recommended | 15 | - |
| 2-8 Hydraulic Circuit Schematic | 15 | - |
| 2-9 Wiring Diagram | 16-39 | Nominal and Allowable Values, Test and Adjustment Specifications, Rubber Crawler Specifications, Steel Crawler Specifications, Common Specifications of Steel & Rubber Crawlers |
| 3-8 Pressure Adjustment | 40-72 | Relief Valves, Swing Brake Valve, Cut-Off Valve, Safety Statements, Safety Precautions, Before You Begin Servicing, Introduction, Special Service Tools |
| 4-6 Starter Motor | 73 | Before You Begin Servicing, Introduction, Starter Motor Specifications, Starter Motor Troubleshooting, Starter Motor Components, Starter Motor |
| 4-7 Alternator | 73 | Before You Begin Servicing, Introduction, Alternator Specifications, Alternator Troubleshooting, Alternator Components, Alternator Wiring Diagram, Alternator Standard Output |
| 4-8 Electronic Control System | 73 | Before You Begin Servicing |
| 4-9 Electric Wiring | 73 | Electric Wiring Precautions |
| 4-10 Failure Diagnosis | 73 | Special Service Tools, Troubleshooting by Measuring Compression Pressure |
| 4-11 Troubleshooting | 74-244 | Quick Reference Table for Troubleshooting, Parts Layout of Electrical Equipment, LCD Monitor and Alarm Systems, Engine ECU, Circuit Description of Auto Deceleration Mode |
| 5-4 Error Code List | 245-252 | Control Valve Operation, Additional Operation of Control Valve, Boom, Arm, Bucket, Swing, Boom Swing, Blade |
| 6-6 Swing Motor | 253 | - |
| 6-8 Proportional Solenoid Valve for P.T.O | 254-489 | 6-1-1 Control Valve Operation, 6-1-2 Additional Operation of Control Valve, 6-2-1 Boom, 6-2-2 Arm |
| 7-7 Cabin | 489 | Removal and Reinstallation of Cabin, Disassembly and Reassembly of Cabin |
| 7-8 Air Conditioner | 490 | 7-1-1 Removal and Reinstallation of Engine, 7-1-2 Removal and Reinstallation of Starter Motor, 7-1-3 Removal and Reinstallation of Radiator and Oil Cooler |
| 7-5 Hydraulic Equipment | 489 | Removal and Reinstallation of Hydraulic Pump, Removal and Reinstallation of Control Valve, Removal and Reinstallation of Pilot Valves, Removal and Reinstallation of Swing Motor |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Sprocket mounting bolt (M14) tightening torque | 127 to 149 N·m | p. 60 |
| Idler seal cover mounting bolt (M12) tightening torque | 79 to 93 N·m | p. 60 |
| Boom fulcrum pin lock plate (M14 x 35) tightening torque | 127 to 149 N·m | p. 62 |
| Arm fulcrum pin lock plate (M14 x 25) tightening torque | 127 to 149 N·m | p. 62 |
| Engine Oil Capacity | 7.4 L | p. 33 |
| Hydraulic Oil Tank Capacity | 38.0 L | p. 33 |
| Fuel Tank Capacity | 66.0 L | p. 33 |
| Rated Output / Engine Speed (GROSS) | 29.6/2400 kW/rpm | p. 22 |
| Maximum Torque / Engine Speed | 131.4 to 143/1440 N•m/rpm | p. 23 |
| System Relief Set Pressure (P1, P2) | 24.5 MPa | p. 19 |
| Swing Brake Valve Set Pressure | 21.6 MPa | p. 71 |
| Cylinder Head Bolt Tightening Torque | 85.3 to 91.1 N•m | p. 64 |
Yanmar ViO50-6A Common Problems This Manual Covers
Yanmar ViO50-6A hydraulic functions become weak, erratic, or bucket responds slowly after service p. 74
Check the hydraulic oil tank level to ensure it meets the 38.0 L capacity listed on page 33. Inspect the return filter for debris exceeding the 10 μ filtration accuracy threshold found on page 21. Measure the system relief set pressure at P1 and P2, verifying it reaches 24.5 MPa.
Manual Section: 4-11 TroubleshootingUndercarriage clunking noise and rubber track sags excessively during daily walkaround inspections p. 60
Inspect the track tension and adjust the grease cylinder. Verify the undercarriage hardware is tight. Torque the sprocket M14 mounting bolts to exactly 127 to 149 N·m as specified on page 60. Clean the track frame to prevent debris buildup around the idler assembly.
Manual Section: 3-8 Pressure AdjustmentDiesel engine starts poorly, runs rough, or loses power in cold weather p. 73
Test compression pressure to diagnose rough running conditions. Remove the valve cover and inspect the head gasket. Torque the cylinder head bolts to the specification of 85.3 to 91.1 N•m found on page 64. Drain the water separator and replace the fuel filter to ensure proper flow.
Manual Section: 4-10 Failure DiagnosisAttachment clunks during heavy operation and boom fulcrum pin shows visible play p. 62
Inspect the boom and arm pivot points for excessive wear. Torque the boom fulcrum pin lock plate M14 bolts to 127 to 149 N·m, as detailed on page 62. Apply fresh grease to all attachment zerks until clean grease pushes out of the pin bosses.
Manual Section: 3-8 Pressure AdjustmentFrequently Asked Questions
How to reset YANMAR ViO50-6A error codes?
To clear error codes, such as an accelerator sensor malfunction, turn the starter switch to the “OFF” position and then to the “ON” position. This action allows the system to recheck and potentially clear the displayed error code.
How to reset YANMAR ViO50-6A hydraulic pilot pressure or monitor settings?
To adjust hydraulic pilot pressure, specifically for system relief valves P1, P2, and P3, retract the bucket or arm cylinder to its stroke end, hold the lever, and read the gauge. Adjust the pressure if necessary, as detailed in the '3-8 Pressure Adjustment' section.
What are the torque specs for YANMAR ViO50-6A track roller bolts?
The torque specification for the track roller mounting bolts (M14) is between 186.0 to 206.0 N·m. It is recommended to apply Three Bond 1324 or its equivalent to these bolts during reinstallation.
What are the replacement specifications for Hydraulic hoses?
Hydraulic hose specifications are detailed by a part description code, which includes material, working pressure, nominal diameter, fitting type, length, and hose protector. For high-pressure pipes, it is crucial to use a new one during replacement to prevent fuel leaks.
What format is this manual in?
This is a 663-page searchable PDF ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Can I print specific sections of this Service Manual?
Yes, print as many copies as you want, and there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
Can I find wiring schematics in this Yanmar ViO50-6A manual?
Yes, full electrical schematics are included with wire colors, connector locations, and circuit descriptions.
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