Need the factory reference for your Kobelco SK18 or SV18? This 410-page Yanmar 3TNV70-VBVA2 SK18 Shop Manual (OEM #S5PFB101E) covers every system on both mini excavators, from the 3-cylinder diesel to the full hydraulic circuit. Open to the hydraulic section and you get full circuit schematics tracing fluid from pump through control valve, pilot valve, swing motor, and travel motor. Inside: a complete troubleshooting guide, error code tables for the electric system, page after page of exploded views, and step-by-step rebuild procedures for every major assembly. Torque the cylinder head bolts to 53.9 to 57.9 N•m; set fuel injection pressure between 12.3 and 13.28 MPa. Your machine is down and the clock is running. Bookmarked and searchable, it opens on any device; bring it to the machine and start wrenching.
What's Inside This Yanmar 3TNV70-VBVA2, SK18 Manual
| System | Pages | Key Topics |
|---|---|---|
| Shop Manual Cover | 1 | Model, Applicable Number, Book Code, Date |
| General Cautions for Maintenance Work | 4-15 | Correct Work, Safety Precautions, Preparations, Cautions for Disassembly and Reassembly, Cautions for Removal and Installation of Hydraulic Equipment |
| Technical Data | 16-37 | Specifications, Outline Drawing and Working Area, Weight List of Main Parts, Lifting Capacity List, Specifications for Attachment, Periodic Inspection and Servicing, Fuel |
| Service Standards | 38-65 | Machine Performance, Undercarriage, Controls, Hydraulic Equipment, Implement, List of Tightening Torque, Pressure Adjustment |
| Engine | 66-199 | Safety, Fuel System, Cooling System, Lubrication System, Starter Motor, Alternator, Electric Wiring |
| Electric System | 200-219 | Electric Equipment of Machine, Circuit Description of Engine Start and Stop, Error Code List |
| Hydraulic System | 220-313 | Outline, Circuit Operation, Hydraulic Pump, Control Valve, Pilot Valve, Swing Motor, Travel Motor |
| Adjustment and Repair | 314-348 | Engine and Electric Equipment, Undercarriage, Controls, Swing Bearing, Hydraulic Equipment, Implements |
| Troubleshooting | 349-410 | Non-Breakdowns |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| SV18 (Engine: 3TNV70-VBVA2) | ||
| Cylinder head bolt tightening torque | 53.9 to 57.9 N•m | p. 58 |
| Fuel injection pressure (Standard) | 12.3 to 13.28 MPa | p. 25 |
| Cold starting aids capacity | 12-120 V - W | p. 26 |
| Glow plug tightening torque | 14.7 to 19.6 N•m | p. 58 |
| Battery type (JIS) | 65B24 | p. 26 |
| Battery voltage - 5 hrs rate capacity | 12-36 V - Ah | p. 26 |
| Fuel filter filtration area | 432 cm² | p. 25 |
| Air cleaner filtration area | 4400 cm² | p. 25 |
| 3TNV70-VBVA2 | ||
| Fuel injection pressure (Test and Adjustment) | 12.3 to 13.3 MPa | p. 47 |
| All Models | ||
| Air cleaner intake hose clip tightening torque | 2.5 to 3.5 N•m | p. 54 |
| Radiator hose clip tightening torque (Hose clip 25) | 2.5 to 3.5 N•m | p. 54 |
| Fuel filter periodic replacement interval (dusty atmosphere) | Every 250h | p. 32 |
Yanmar 3TNV70-VBVA2, SK18 Common Problems This Manual Covers
Yanmar 3TNV70-VBVA2 SK18 engine turns over slowly or experiences hard starting and excessive smoke in cold weather. p. 58
Test the cold starting aids capacity to ensure it meets the 12-120 V - W specification. Inspect battery voltage and connections carefully. If replacing the glow plugs, torque the new units precisely to 14.7 to 19.6 N•m as detailed on page 58. Check the starter motor solenoid if issues persist.
Manual Section: Service Standards: Troubleshooting ProceduresMini excavator engine runs hot under load with rapid coolant loss and high temperature gauge readings. p. 54
Inspect the radiator and cooling system for blockages. Check the fan belt tension and verify the coolant level. Tighten the radiator hose clips to 2.5 to 3.5 N•m as instructed on page 54. Drain and fill the coolant only when the engine is completely cold to prevent severe burns.
Manual Section: Service StandardsEngine runs rough with excessive exhaust smoke and noticeable loss of power during heavy digging operations. p. 58
Measure the fuel injection pressure to verify it falls between 12.3 to 13.3 MPa. Remove and clean the fuel filters. When installing new injectors, torque them to 49 to 59 N•m as shown on page 58. Replace the fuel filter every 250h in dusty atmospheres.
Manual Section: Service Standards: Troubleshooting ProceduresWork implement does not move or boom operates extremely slowly when attempting to lift a load. p. 56
Check the hydraulic oil amount to confirm the tank holds its 20 L capacity. Inspect the pilot valve and control valve for sticking spools. If replacing lines, torque the hydraulic hose clip 60 to 2.5 to 3.5 N•m as specified on page 56.
Manual Section: Service StandardsStarter motor clicks but engine will not crank or displays intermittent electrical shutdown during normal operation.
Inspect the battery connections and verify the holding rod nut is tightened to exactly 23 to 27 N•m. Clean the terminals and test the safety relay. Review the error code reference to isolate accelerator sensor or fuel injection pump rotation sensor faults.
Manual Section: Engine: Error Code ReferenceFrequently Asked Questions
How do I reset the Yanmar 3TNV70-VBVA2 after a fault?
The manual does not describe a single, general procedure to reset the Yanmar 3TNV70-VBVA2 after a fault. However, for many specific error codes listed in the Error Code List (Section 5-3, page 214), the corrective measure involves turning the starter switch to the OFF position and then to the ON position to check if the error code is displayed again.
What do the error codes mean on a Yanmar 3TNV70-VBVA2?
The manual provides a detailed Error Code List in Section 5-3, starting on page 214. This list includes the error code, a description of the error, detection conditions, possible causes, and corrective measures for various malfunctions related to the engine and electric system. For example, error code 00 000091.00 means Accelerator sensor malfunction: above normal operating range (SAEJ1843).
What is the torque spec for the cylinder head bolts on a Yanmar 3TNV70?
For the Yanmar 3TNV70-VBVA2 engine, the cylinder head bolts (M9 x 1.25) should be tightened to a torque of 53.9 to 57.9 N-m. Lubricating oil should be applied to the threads of these major component fasteners.
How do I bleed the fuel system on a Yanmar 3TNV70-VBVA2?
To bleed (prime) the fuel system, if the unit has an electric fuel pump, turn the key switch to the ON position for 10 to 15 seconds, or until the fuel coming out of the air bleed port is free of bubbles. If it has a mechanical fuel pump, operate the fuel priming lever several times until the fuel filter cup is filled with fuel. This procedure is mentioned in the safety precautions on page 68 and after fuel injection pump installation on page 137.
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