This 529-page Yanmar ViO27-6 Service Manual covers your ViO27-6 mini excavator from engine rebuild to hydraulic pump teardown, with every spec pulled straight from the Yanmar factory. Inside: full hydraulic circuit schematics with complete fluid routing, wiring diagrams for the engine start/stop circuit and automatic deceleration system, an error code list, and a troubleshooting quick-reference table. You also get torque tables across every major fastener group, pressure adjustment specs for relief valves, swing brake, and cut-off valves, plus step-by-step procedures for cylinder head, fuel injection timing, swing bearing service, and travel motor removal. Torque the travel motor to the track frame at 46 to 54 N·m; swing bearing bolts to both the track frame and turning frame call for 116 to 138 N·m. Your machine is down and forum guesses won\'t fix it. Grab your tablet, walk to the excavator, and pull up any spec by keyword in seconds.
What's Inside This Yanmar ViO27-6 Manual
| System | Pages | Key Topics |
|---|---|---|
| General Cautions for Maintenance Work | 10-21 | 1-1 Correct Work, 1-2 Safety Precautions, 1-3 Preparations, 1-4 Cautions for Disassembly and Reassembly, 1-5 Cautions for Removal and Installation of Hydraulic Equipment |
| Technical Data | 22-49 | 2-1 Specifications, 2-2 Outline Drawing and Working Area, 2-3 Weight List of Main Parts, 2-4 Lifting Capacity List, 2-5 Specifications for Attachment |
| Service Standards | 50-81 | Machine Performance, Engine, Undercarriage (Rubber Track Specifications, Steel Track Specifications, Common Specifications of Steel & Rubber Crawlers), Controls |
| Engine | 82-217 | 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 Electric Wiring |
| Electric System | 218-241 | 5-1 Electric Equipment of Machine, 5-2 Circuit Description of Engine Start and Stop, 5-3 Automatic Deceleration System, 5-4 Error Code List |
| Hydraulic System | 242-417 | 6-1 Outline, 6-2 Circuit Operation, 6-3 Hydraulic Pump, 6-4 Control Valve, 6-5 Pilot Valve, 6-6 Swing Motor, 6-7 Travel Motor |
| Adjustment and Repair | 418-513 | 7-1 Engine and Electric Equipment, 7-2 Undercarriage, 7-3 Controls, 7-4 Swing Bearing, 7-5 Hydraulic Equipment, 7-6 Work Implements, 7-7 Cabin |
| Troubleshooting | 514-529 | 8-1 Non-Breakdowns, 8-2 Quick Reference Table for Troubleshooting |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Tightening torque for Travel motor × Track frame | 46 to 54 N·m | p. 72 |
| Tightening torque for Swing bearing × Track frame | 116 to 138 N·m | p. 72 |
| Tightening torque for Swing bearing × Turning frame | 116 to 138 N·m | p. 72 |
| Suction filter filtration area | 1120 cm² | p. 28 |
| Suction filter filtration accuracy | 75 u | p. 28 |
| LO filter filtration area | 800 cm² | p. 31 |
| LO filter valve opening pressure | 0,08 to 0,12 MPa | p. 31 |
| Fuel filter filtration area | 432 cm² | p. 31 |
| Travel motor displacement (Low/High) | 18.4 / 10.6 cm³/rev | p. 28 |
| Travel motor system pressure | 20,6 MPa | p. 28 |
| Hydraulic hose working pressure (example) | 17.2 to 20.6 MPa | p. 17 |
| Hydraulic hose nominal diameter (example) | 3 / 8" | p. 17 |
Yanmar ViO27-6 Common Problems This Manual Covers
Yanmar ViO27-6 bucket or blade drifts down slowly with joysticks released and engine at idle p. 242
Inspect swivel joint o-rings and seals for bypass leakage before pulling the control valve. Verify main circuit pressure holds at 20.6 MPa (page 26) with the machine at operating temperature. If pressure holds but drift continues, replace the swivel joint seal kit; cylinder drift diagnosis is covered starting page 242.
Manual Section: Control Valve TroubleshootingOne track pulls slower than the other during straight travel, machine veers consistently to one side p. 72
Check travel motor system pressure against the 20.6 MPa specification (page 28) on both sides before condemning the motor. Verify mounting bolts are torqued to 46-54 N·m (page 72). Motor displacement at low/high speed is 18.4/10.6 cm³/rev; a unit not reaching spec under load points to internal wear or counterbalance valve failure.
Manual Section: Travel Motor TroubleshootingHydraulic functions slow down under load, boom and arm response lags between commands p. 28
Drain and refill the 25 L hydraulic oil tank (page 28) with fresh fluid; degraded or contaminated oil is the most common cause of sluggish response under load. Inspect the return filter bypass, which opens at 0.15 MPa (page 28); a tripping bypass means the element needs replacement. Verify system relief is at 20.6 MPa (page 26).
Manual Section: Hydraulic Pump TroubleshootingEngine loses power or runs rough after sitting overnight, water separator indicator turns red p. 31
Drain the fuel water separator daily before startup; never skip this step after the machine sits overnight. Check the 432 cm² fuel filter element (page 31) for clogging or water saturation and replace if contaminated. With a 30.5 L tank (page 39), always fill with clean diesel. Fuel system restriction diagnosis starts in the Engine chapter at page 82.
Manual Section: Engine TroubleshootingCoolant temperature gauge rises toward red during normal digging cycles, coolant level keeps dropping p. 72
Inspect all coolant hose connections and tighten clips to 2.5-3.5 N·m (page 72); a loose clip causes seepage that shows up as repeated low-coolant warnings. Look for steam or staining at every hose junction during warmup. Full cooling system inspection and service procedures are in the Engine chapter starting page 82.
Manual Section: EngineFrequently Asked Questions
How do I reset the Yanmar ViO27-6 fault code?
To cancel an error condition after a failure occurs and the cause has been resolved, use the starter switch to turn the power OFF and then back ON. This procedure is applicable for error codes related to control unit output/internal circuit failure, actuator motor failure, running time failure, and motor speed setting memory failure.
What does error code mean on Yanmar ViO27-6 excavator?
The manual provides an error code list detailing the error description, detection condition, causes, and corrective measures. For example, error code 00 000091.00 indicates an "Accelerator sensor malfunction: above normal operating range (SAEJ1843)" when the sensor voltage is 4.6 V or more, or 0.2 V or less.
How do I clear the ECU alarm on Yanmar ViO27-6?
To clear an ECU alarm after resolving the underlying cause, turn the starter switch to the "OFF" position and then back to the "ON" position. This method is applicable for various ECU malfunction errors, such as those related to accelerator sensors, engine oil pressure switches, and coolant temperature sensors.
Yanmar ViO27-6 torque specs for track motor
The tightening torque for the track roller, which is part of the travel device, is specified between 206 to 245 N·m for M16×35 bolts. This torque is applied using Loctite 262 or K-965 equivalent adhesive.
What do I get after purchasing this Yanmar ViO27-6 manual?
Immediate download of the complete 529-page searchable Service Manual. Access it on any device, from a laptop at your desk to a phone in the field.
Is this Yanmar ViO27-6 Service Manual printable?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
Does this Service Manual have electrical diagrams?
Yes, this Yanmar ViO27-6 Service Manual includes complete electrical wiring diagrams, wire routing, and connector pinouts.
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