Fixing the undercarriage or tracking down a swing bearing issue on your compact excavator? This 384-page Yanmar ViO15-2 service manual PDF breaks down every pump, motor, and implement adjustment procedure required to keep the machine working hard. Inside, you get complete hydraulic schematics for tracing flow issues, plus detailed exploded views of the travel reduction gear. Open up the massive troubleshooting section to find exact diagnostic steps for a drifting upperstructure or thermal shock in the travel motor. Bleed the hydraulic equipment by extending the cylinder 1.97 to 3.9 inches from each stroke end four to five times, and verify your fuel filter meets the 67.0 sq.in. filtration area requirement. Stop throwing parts at a drifting boom. Grab this bookmarked download, open it on your tablet right next to the machine, and get the job done.
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 |
|---|---|---|
| Air Release of Hydraulic Equipment Procedure | Run the engine at medium speed and activate the respective circuits for about 10 to 15 minutes. Extend and retract the cylinder up to 1.97 to 3.9 in. (50 to 100 mm) from each stroke end slowly 4 or 5 times. Then, fully extend and retract the cylinder 3 or 4 times. | p. 18 |
| 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
Yanmar ViO15-2 excavator work implement operates slowly and has weak digging force after hydraulic component replacement p. 18
Run the engine at medium speed to bleed air from the circuit following page 18. Slowly extend and retract the cylinder leaving 1.97 to 3.9 in. (50 to 100 mm) from each stroke end. Repeat 4 or 5 times before fully extending the cylinder.
Manual Section: Work Implement Operation IssuesEngine coolant level drops repeatedly and machine overheats during continuous digging operations p. 265
Inspect all radiator hoses and clamps for dry rot or damage. Replace any damaged hoses and tighten the CW-T hose bands to the specified 1.8 to 2.2 ft·lbf (2.5 to 2.9 N·m) torque shown on page 265. Refill the cooling system.
Manual Section: Engine Troubleshooting (Low Output, Overheating, Smoke Emission)Engine starts poorly in cold weather and runs rough or stalls under heavy load p. 91
Test the pre-heating circuit and verify the glow plug operating time reaches 4 sec. as specified on page 91. Drain water from the separator daily and verify the 20.0 L fuel tank has clean diesel. Check the cold intake valve clearance is 0.15 to 0.25 mm.
Manual Section: Engine Troubleshooting (Low Output, Overheating, Smoke Emission)Hydraulic fluid leaks at pipe joints or hose connections after routine maintenance p. 143
Remove the leaking fitting and inspect the O-ring or seal for damage, replacing it if worn or distorted. Clean the mating surfaces of any debris or burrs. Reinstall with a new seal and retorque the connection to the specified value. Cycle the hydraulic circuit under load and recheck the joint for leaks under working pressure.
Frequently Asked Questions
What are the torque specifications for the track roller bolts on a Yanmar ViO15-2?
The tightening torque for the track roller mounting bolt (M12) is 57.9 to 72.3 ft·lbf (78.5 to 98.1 N·m). This specification is also applicable for the track roller tightening nut.
What is the torque specification for the swing bearing on a Yanmar ViO15-2?
The tightening torque for the swing bearing (M12) is 79.6 to 94.0 ft·lbf (107.8 to 127.4 N·m). It is recommended to apply Loctite 262 or its equivalent during installation.
How do I bleed the hydraulic system on a Yanmar ViO15-2?
To release air from each hydraulic component, run the engine at medium speed and activate the respective circuits for about 10 to 15 minutes. For hydraulic cylinders, set the engine speed at low idling range, then extend and retract the cylinder up to 1.97 to 3.9 inches (50 to 100 mm) from each stroke end slowly 4 or 5 times, followed by fully extending and retracting the cylinder 3 or 4 times.
What is the engine oil capacity for a Yanmar ViO15-2?
The prescribed amount of engine oil for the engine oil pan is 3.2 quarts (3.0 liters). The recommended oil type is SAE 10W30, CD class, or SAE 10W-30CD, SAE 15W-40CD based on temperature ranges.
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.
Document Quality
This is a scanned document with an OCR layer, allowing you to search and copy text throughout. The text is consistently crisp and easy to read on every page. Diagrams and illustrations are raster images, but their labels are clear and readable, ensuring all visual information is accessible. The pages are clean, free from scan artifacts, stains, marks, or skewed content. There are no notable blank or filler pages present.
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