Part of the Yanmar Repair Manuals.
Drain the water separator, crack the fuel filter loose, and you still need to know why the 4TNV98C-WBV1 diesel stalls under load. This Yanmar ViO82 service manual (publication 0BKB3-EN0320) puts the answer next to the machine: 803 pages in English covering the engine, fuel, cooling, and lubrication systems, the electric system with engine and pump ECU descriptions and error codes, and the full hydraulic circuit from pump and control valve to swing and travel motors.
The Service Standards chapter gives you the numbers that settle arguments: relief pressures, valve clearances, tightening torques, and fluid capacities. Adjustment and Repair walks through undercarriage, swing bearing, controls, hydraulic equipment, cabin, and air conditioner work, and a quick reference troubleshooting table ties symptoms back to procedures.
It is a searchable PDF, so it rides on the laptop or tablet that goes where the excavator goes. When the machine stops, the manual is already on site.
What's Inside This Yanmar ViO82 Manual
| System | Pages | Key Topics |
|---|---|---|
| General Cautions for Maintenance Work | 12-60 | Correct Work, Safety Precautions, Preparations, Cautions for Disassembly and Reassembly, Cautions for Removal and Installation of Hydraulic Equipment |
| Service Standards | 61-90 | 3-1 Machine Performance, 3-2 Engine, 3-3 Undercarriage, 3-4 Controls, 3-5 Hydraulic Equipment, 3-6 Implement, 3-7 List of Tightening Torque, 3-8 Pressure Adjustment |
| Engine | 91-247 | 4-1 Safety, 4-2 Engine, 4-3 Fuel System, 4-4 Cooling System, 4-5 Lubrication System, 4-6 Starter Motor, 4-7 Alternator, 4-8 Electronic Control System |
| Electric System | 248-314 | 5-1 Electric Equipment of Machine, 5-2 Circuit Description of Engine Start and Stop, 5-3 Engine ECU (Engine Controller), 5-4 Pump ECU (Pump Controller), 5-5 Error Code |
| Hydraulic System | 315-594 | 6-1 Outline, 6-2 Hydraulic Pump, 6-3 Control Valve, 6-4 Pilot Valve, 6-5 Swing Motor, 6-6 Travel Motor, 6-7 Pump Control Proportional Solenoid Valve, 6-8 Cutoff Valve |
| Adjustment and Repair | 595-784 | 7-1 Engine and Electric Equipment, 7-2 Undercarriage, 7-3 Controls, 7-4 Swing Bearing, 7-5 Hydraulic Equipment, 7-6 Implement, 7-7 Cabin, 7-8 Air Conditioner |
| Troubleshooting | 785-796 | 8-1 Non-Breakdowns, 8-2 Quick Reference Table for Troubleshooting |
| Colophon | 797-798 | - |
| Appendix | 799-803 | Cabin Harness, Controller (Pump) Detailed Drawing, Controller (Engine) Detailed Drawing, Engine Harness, Harness B, Harness D |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Tightening torque for Hexagon head bolt (7T) Nut, Coarse screw thread, M8 × 1.25 | 16.67 to 20.95 ft·lbf (22.6 to 28.4 N·m) | p. 82 |
| Hydraulic hose length change under high pressure | +2 % to -4 % | p. 15 |
| Tightening torque for Hydraulic Fitting, Parallel pipe thread G (PF), 1/4 | 16.6 to 20.3 ft·lbf (22.6 to 27.5 N·m) | p. 83 |
| Suction filter filtration accuracy | 105 μ | p. 27 |
| Return filter filtration accuracy | 10 μ | p. 27 |
| Fuel filter filtration area | 2000 sq.cm | p. 29 |
| Oil/water separator type | Float type | p. 29 |
| LO filter filtration area | 1160 sq.cm | p. 29 |
| Air cleaner filtration area | 1.93 sq.m | p. 30 |
| Tightening torque for Cooling water hose clip 48 | 1.8 to 2.5 ft·lbf (2.5 to 3.4 N·m) | p. 77 |
| Engine Oil Capacity | 10.5 L | p. 46 |
| Hydraulic Oil Capacity (in tank) | 60 L | p. 46 |
Yanmar ViO82 Common Problems This Manual Covers
One track slow or weak
When one side of the ViO82 tracks poorly or loses power, the cause can sit anywhere from the travel motor to the control valve. The Hydraulic System chapter covers the travel motor, control valve, and pilot valve so you can isolate the circuit instead of guessing.
Manual Section: Hydraulic System p. 315Hydraulic hose leaks at bends and fittings
Pressurized hoses change length in service and wear where they rub or bend, ending in swelling, cracks, or leaks. The manual documents correct hydraulic hose installation, hose specifications, and cautions for removing and refitting hydraulic piping.
Manual Section: General Cautions for Maintenance Work p. 12Engine runs rough or stalls
Water in the separator, a clogged fuel filter, or air in the fuel delivery will make the 4TNV98C-WBV1 start but run rough and die under load. The Engine chapter covers the fuel system, cooling and lubrication systems, and the electronic control system.
Manual Section: Engine p. 91Error codes and starting faults
A machine that cranks but will not start, or throws an error code mid-shift, needs the circuit descriptions for engine start and stop plus the error code list. The Electric System chapter covers both ECUs (engine and pump) and the machine's electrical equipment.
Manual Section: Electric System p. 248Weak dig force, low system pressure
When boom and arm cylinders lose authority, the first check is main relief pressure against spec. Service Standards lists machine performance figures, hydraulic equipment standards, and the pressure adjustment procedure with the set values to test against.
Manual Section: Service Standards p. 61Track tension and undercarriage wear
Loose track chain, worn idlers, and undercarriage slop show up as poor tracking and thrown tracks long before total failure. The Adjustment and Repair chapter covers undercarriage service along with swing bearing, controls, and implement work.
Manual Section: Adjustment and Repair p. 595Overheating after sustained digging
Heat problems after long dig cycles can be cooling system fouling or a hydraulic circuit issue, and chasing the wrong one wastes a day. The Troubleshooting chapter separates non-breakdowns from real faults with a quick reference table.
Manual Section: Troubleshooting p. 785Frequently Asked Questions
Which machine does this manual cover?
It covers the Yanmar ViO82 hydraulic excavator with the 4TNV98C-WBV1 engine, Yanmar publication 0BKB3-EN0320. It is a factory-level service manual in English, 803 pages, covering engine, electric, hydraulic, undercarriage, cabin, and air conditioner service.
Does it cover error codes and the ECUs?
Yes. The Electric System chapter includes the error code list plus circuit descriptions for engine start and stop and coverage of both the engine ECU and pump ECU, so you can trace a code to a circuit instead of swapping parts. p. 248
Are torque specs and pressure settings included?
Yes. The Service Standards chapter has the list of tightening torques for bolts and hydraulic fittings, fluid capacities, and the pressure adjustment procedure with system relief and other set pressures. p. 61
Does it cover hydraulic pump and travel motor repair?
Yes. The Hydraulic System chapter runs from pump through control valve, pilot valve, swing motor, travel motor, proportional solenoid valve, and cutoff valve, with disassembly-level detail. p. 315
Is this Service Manual a digital download?
Immediate download of the complete 803-page searchable Service Manual. Access it on any device, from a laptop at your desk to a phone in the field.
Are there any print restrictions on this manual?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
Does this Yanmar ViO82 manual include hydraulic schematics?
Yes, this Yanmar ViO82 Service Manual includes hydraulic system diagrams, circuit schematics, and component specifications.
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