Looking for the factory teardown procedures for your excavator? This 504-page Yanmar ViO70 (US) service manual PDF breaks down the complete hydraulic, engine, and undercarriage systems to get your machine back in the dirt. You get complete hydraulic circuit schematics, detailed electrical wiring diagrams, and extensive troubleshooting charts to track down any fault. Open to the servicing standards section for page after page of torque specs, lifting capacities, and control valve adjustment procedures. Verify the hydraulic pump piston and cylinder block clearance is ≤ 0.0020 inches, and confirm your track deviation standard stays under 11.8 inches before returning the unit to service. A dead machine burns through your profit margin. Download this bookmarked file, pull up the exact specs on your tablet, and start wrenching.
What's Inside This Yanmar ViO70 (US) Manual
| System | Pages | Key Topics |
|---|---|---|
| Vio70(US) | 1 | Main Specifications of Machine, Hydraulic Implement, Cylinder, Motor, Undercarriage, Engine |
| General Cautions for Maintenance Work | 5-13 | Correct Work, Safety Precautions, Preparations, Cautions for Disassembly and Reassembly, Cautions for Attaching and Detaching Hydraulic Equipment |
| Technical Data | 14-23 | Specifications, External Drawings and Working Ranges (Canopy Type Specifications), Weight of Main Parts, Lifting Capacities |
| Servicing Standards | 24-42 | Machine Performance, Engine, Undercarriage (Rubber Track Specifications, Steel Track Specifications, Steel & Rubber Track Common Specifications), Control Devices |
| Hydraulic System | 43-81 | Outline (Function of Control Valve Operation, Additional Operation of Control Valve), Hydraulic Circuit Schematic |
| Hydraulic Equipment | 82-266 | 5-1 Hydraulic Pump, 5-2 Control Valve, 5-3 Pilot Valve, 5-4 Swing Motor, 5-5 Travel Motor |
| Adjustment Procedures for Each Equipment | 267-338 | Electric Equipment of the Machine (Arrangement of Electrical Equipment and Names of Parts, Monitor and Alarm Systems, Electric Wiring Diagram) |
| Periodic Inspection and Servicing | 339-341 | List of Periodic Inspection and Servicing |
| Fuel,Lube Oil and Grease Recommended | 342-344 | 8-1 Fuel, Lube Oil and Grease Recommended by Yanmar, 8-2 Cooling Water Recommended by Yanmar |
| Troubleshooting | 345-380 | Non Breakdowns (Natural Release of Bucket, Discontinuous Arm Movement, Thermal Shock of Travel Motor, Elongation of Boom Swing Cylinder on 58 Degrees Swing, Time Lag on Switching Travel Speed) |
| Reference Data | 381-382 | 10-1 Specifications for Attachment |
| Diesel Engine | 383-504 | Foreword, For Safe Servicing, Precautions for Safe Servicing, Contents, General, Troubleshooting, Engine Body |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Track deviation standard | Less than 11.8 in. (300 mm) | p. 26 |
| Hydraulic pump piston and cylinder block clearance | ≤ 0.0020 in. (0.050 mm) | p. 117 |
| New V-belt tension deflection (98 N finger pressure) | 0.276 to 0.354 (7 to 9) in. (mm) | p. 497 |
| Air cleaner type and filtration area | Cyclone type, 11.84 (7.1) sq.ft. (sq.m) | p. 19 |
| Thermostat actuation temperature | 157.1 to 162.5°F (69.5 to 72.5°C) | p. 408 |
| Engine Model | 4TNE98-EBV | p. 15 |
| Rated Engine Output | 57 HP (42 kW) at 1900 RPM | p. 15 |
| Fuel Tank Capacity | 29.0 Gals. (110 L) | p. 343 |
Yanmar ViO70 (US) Common Problems This Manual Covers
Yanmar ViO70 hydraulic pump whining under load and boom fails to raise or extend. p. 117
Remove the pump and measure the clearance between the outside diameter of the piston and inside diameter of the cylinder block as shown on page 117. Replace components if the clearance exceeds 0.0020 in. (0.050 mm) to restore lifting power.
Manual Section: 5 Hydraulic EquipmentLeft travel stick unresponsive or machine tracks unevenly during forward and reverse travel. p. 116
Inspect the track motor solenoid and controller for damage. Torque the track motor solenoid mounting screws to 2.53 to 3.25 ft-lbf. (3.43 to 4.41 N·m) following the guidelines on page 116. Verify the track deviation remains less than 11.8 in. (300 mm) after adjustment.
Manual Section: 5 Hydraulic EquipmentEngine overheating quickly during operation despite normal coolant levels in the expansion tank. p. 408
Test the cooling system by heating the thermostat in water. Verify it actuates between 157.1 to 162.5°F (69.5 to 72.5°C) as detailed on page 408. Check the V-belt tension on page 497 and adjust deflection to 0.276 to 0.354 in. (7 to 9 mm) under 98 N finger pressure.
Manual Section: Diesel EngineHydraulic system leaking fluid at the main high pressure hose seals or cylinder connections. p. 10
Clean the leaking joints and inspect all high pressure rubber hoses for degradation. Replace any damaged 0.37 in. nominal diameter hoses rated for a working pressure of 2986 PSI (20595 kPa) as specified on page 10. Torque the hydraulic system adjust screws to 20.2 to 23.2 ft-lbf. (27.4 to 31.4 N·m).
Manual Section: 1 General Cautions for Maintenance WorkFrequently Asked Questions
What is the standard oil capacity for the engine pan of the Yanmar ViO70 US excavator?
The standard oil capacity for the engine pan is 10.78 Qts. (10.2 L). This information is crucial for proper maintenance and to ensure the engine is adequately lubricated.
What is the recommended fuel type for the Yanmar ViO70 US excavator?
The recommended fuel type for the Yanmar ViO70 US excavator is No.1-D. This ensures optimal engine performance and longevity.
What is the standard valve clearance for the intake and exhaust valves on the Yanmar ViO70 US engine?
The standard valve clearance for both intake and exhaust valves is 0.004 to 0.008 inches (0.10 to 0.20 mm). Maintaining correct valve clearance is essential for engine efficiency and to prevent damage.
What is the tightening torque for the cylinder head bolts on the Yanmar ViO70 US engine?
The cylinder head bolts should be tightened in two steps: first to 36.1 to 43.4 ft-lbf (49 to 58.8 N·m), and then to 75.9 to 83.1 ft-lbf (102.9 to 112.7 N·m). Following this two-step procedure is critical for proper sealing and to prevent cylinder head warpage.
What is the recommended tension for the fan belt on the Yanmar ViO70 US engine?
For a new fan belt, the recommended deflection is 0.28 to 0.35 inches (7 to 9 mm) under a finger pressure of 72.3 lbf (98 N). For used parts, the deflection should be 0.39 to 0.59 inches (10 to 15 mm). Proper belt tension is vital for the efficient operation of the cooling system and alternator.
What is the standard operating pressure for the system relief valve in the hydraulic system of the Yanmar ViO70 US?
The system relief valve for Piston pump P1 and P2 should be set to 3555 PSI (24518 kPa) with a pump flow of 18.5 GPM (70 L/min.). For the Gear pump, the set pressure is 2986 PSI (20595 kPa) with a pump flow of 15.0 GPM (57 L/min.). These settings are critical for the correct operation and protection of the hydraulic system.
Document Quality
This document is a scanned PDF, not a native digital file, but you can search the full text as an OCR layer is present. Text quality is generally readable, though some parts show minor blurriness and typical scan artifacts. Diagrams and illustrations are raster images, mostly clear, with readable labels. Pages are largely clean, but some exhibit slight skewing and faint lines. There are no notable blank or filler pages.
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