Part of the Yanmar Repair Manuals.
When the bucket on a ViO15-2 starts creeping down under load, guessing at the cause can cost your crew a full day. This Yanmar ViO15-2 service manual gives you the factory procedure instead: 384 pages in English covering the whole excavator, from the 3TNE68-EBVA diesel engine to the hydraulic pump, control valve, swing motor, travel motor and undercarriage.
Inside are the numbers you cannot safely invent: relief pressure settings, valve clearances, a full tightening torque list, and service standards for the engine, cylinders, controls and undercarriage. The troubleshooting chapter works through real symptoms, including natural release of the bucket, discontinuous arm movement and drifting of the upperstructure, and the adjustment and repair chapter carries the fixes.
It arrives as a PDF download with a searchable text layer. Buy it once and it is yours to keep for the life of this machine, in the cab or printed for the bench.
What's Inside This Yanmar ViO15-2 Manual
| System | Pages | Key Topics |
|---|---|---|
| General Cautions for Maintenance Work | 10-18 | Correct Work, Safety Precautions, Disassembly and Reassembly, Hydraulic Equipment Removal, Hydraulic Piping, Seals, Hydraulic Hose Installation |
| Technical Data | 19-30 | Specifications, Outline Drawing, Working Area, Weight List of Main Parts, Lifting Capacity |
| Service Standards | 31-49 | Machine Performance, Engine Standards, Undercarriage, Controls, Hydraulic Cylinders, Implement, Tightening Torque List |
| Engine | 50-98 | Compression Pressure, Valve Clearance, V-Belt, Fuel Injection, Idling Speed, Cooling System, Electrical Equipment, Starter Motor, Alternator, Glow Plug |
| Hydraulic System | 99-146 | Control Valve Operation, Hydraulic Circuit Schematic, Circuit Operation (Boom/Arm/Bucket/Swing/Travel/Blade), Pressure Adjustment, Relief Valves |
| Hydraulic Equipment | 147-252 | Seals and O-Rings, Hydraulic Pump, Control Valve Assembly, Swing Motor, Travel Motor, Cylinders, Swing Bearing, Undercarriage |
| Adjustment and Repair | 253-338 | Electric Equipment of Machine, Undercarriage, Controls, Swing Bearing, Hydraulic Equipment, Implement |
| Periodic Inspection and Servicing | 339-341 | General Checks, Lube Oil, Hydraulic System, Grease, Undercarriage, Electric Equipment |
| Fuel, Lube Oil and Grease Recommended | 342-343 | Engine Oil, Travel Reduction Gear Oil, Hydraulic Oil, Fuel, Engine Cooling Water |
| Troubleshooting | 344-380 | Natural Release of Bucket, Discontinuous Arm Movement, Drifting of Upperstructure, Thermal Shock of Travel Motor, Machine and Engine Troubleshooting |
| Reference Data | 381-382 | Specifications for Attachment, Bucket Installation Dimensions, Cylinder Length, Bucket Arm Pin Height |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Replacement of seals and O-rings | In principle, the removed seals and O-rings must be replaced with new ones. | p. 143 |
| Fuel filter filtration area | 67.0 (432) sq.in. (sq.cm) | p. 25 |
| Oil/water separator mesh filter screen | 100 mesh | p. 25 |
| LO filter filtration area | 124.1 (800) sq.in. (sq.cm) | p. 25 |
| Air cleaner filtration area | 4.7 (0.44) sq.ft. (sq.m) | p. 25 |
| Hose band (CW-T) tightening torque | 1.8 to 2.2 ft·lbf (2.5 to 2.9 N·m) | p. 265 |
| Engine Model | 3TNE68-EBVA | p. 24 |
| Total Engine Displacement | 784 cu.cm | p. 24 |
| Rated Engine Output | 8.5 KW at 2000 rpm | p. 24 |
| Engine Compression Pressure | 3.2 MPa at 300 rpm | p. 24 |
| Intake/Exhaust Valve Clearance (Cold Engine) | 0.15 to 0.25 mm | p. 25 |
Yanmar ViO15-2 Common Problems This Manual Covers
Bucket drifts down under load
A loaded bucket that slowly lowers on its own points to internal leakage in the circuit or cylinder. The troubleshooting chapter addresses natural release of the bucket directly, so you can isolate the cause before pulling anything apart.
Manual Section: Chapter 10 Troubleshooting p. 344Weak or jerky hydraulic functions
Slow boom lift or discontinuous arm movement often traces to air in the circuit, contaminated oil or an out-of-spec relief valve. The hydraulic system chapter explains circuit operation for boom, arm, bucket, swing, travel and blade, plus the pressure adjustment procedure.
Manual Section: Chapter 5 Hydraulic System p. 99Leaks at cylinders and fittings
Aging seals and O-rings are the usual source of drips at cylinders, the pump and pipe joints, and the manual is firm that removed seals get replaced, not reused. This chapter covers seal replacement across the pump, control valve, swing motor, travel motor and cylinders.
Manual Section: Chapter 6 Hydraulic Equipment p. 147Hard starting or rough running
Water in the separator, a clogged fuel filter or a tired glow plug will keep a small diesel from lighting off on a cold morning. The engine chapter covers fuel injection, compression pressure checks, the glow plug and the starter motor.
Manual Section: Chapter 4 Engine p. 50Overheating and coolant loss
Coolant hoses and clamps dry out and loosen on machines this size, and a slow leak becomes an overheated engine in one shift. The cooling system is covered in the engine chapter, from checks through repair.
Manual Section: Chapter 4 Engine p. 50Machine pulls to one side traveling
Uneven track tension, undercarriage wear or a fault on one travel side will make the machine crab instead of tracking straight. The adjustment and repair chapter covers the undercarriage, controls and hydraulic equipment needed to correct it.
Manual Section: Chapter 7 Adjustment and Repair p. 253Frequently Asked Questions
Which machine does this manual cover?
The Yanmar ViO15-2 mini excavator with the 3TNE68-EBVA diesel engine. It is the full service manual, 384 pages in English, covering engine, hydraulic system and equipment, undercarriage, electrical equipment, adjustment and repair, and troubleshooting.
Does it explain how to bleed the hydraulic system?
Yes. The air release procedure in Chapter 1 has you run the engine at medium speed, operate each circuit for 10 to 15 minutes, then slowly cycle each cylinder to 50 to 100 mm short of the stroke ends 4 or 5 times before full strokes. p. 10
Are torque specs and pressure settings included?
Yes. The Service Standards chapter includes a tightening torque list plus wear standards for the engine, undercarriage, controls and cylinders. Technical Data lists the hydraulic relief set pressure of 20.6 MPa for P1 and P2, along with full machine specifications. p. 31
Does it cover the hydraulic pump, travel motor and swing motor?
Yes. The Hydraulic Equipment chapter covers disassembly and service of the hydraulic pump, control valve assembly, swing motor, travel motor, cylinders and swing bearing, including seal and O-ring replacement. p. 147
What format is this manual in?
Instant PDF download. You get the full 384-page searchable Service Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Can I print specific sections of this Service Manual?
The PDF is DRM-free — print whatever sections you need to take out to the shop. Standard letter or A4 paper works fine.
Are there hydraulic schematics in this Yanmar ViO15-2 manual?
Yes, this Yanmar ViO15-2 Service Manual includes hydraulic system diagrams, circuit schematics, and component specifications.
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