All 554 pages of this Yanmar ViO25-6L Service Manual cover one compact excavator, front to back. Inside: full hydraulic circuit schematics detailing control valve operation and complete circuit behavior for boom, arm, bucket, swing, blade, and travel, plus wiring diagrams spanning the LCD monitor, auto deceleration system, and engine start/stop circuits. You also get a tightening torque section covering machine fasteners, engine bolts, and hydraulic fittings, a troubleshooting chapter with non-breakdown symptom tables and quick-reference fault guides, and a complete error code list for the auto deceleration alarm. Hydraulic hose working pressure runs 17.2 to 20.6 MPa; replace the fuel filter every 500 hours and inspect the water separator daily. Your machine is down. Open the PDF on any device, search by keyword, and get back to work.
What's Inside This Yanmar ViO25-6L Manual
| System | Pages | Key Topics |
|---|---|---|
| General Cautions for Maintenance Work | - | Correct Work, Safety Precautions, Preparations, Cautions for Disassembly and Reassembly, Cautions for Removal and Installation of Hydraulic Equipment |
| Technical Data | - | Specifications, Outline Drawing and Working Area, Weight List of Main Parts, Lifting Capacity List, Specifications for Attachment, Periodic Inspection and Servicing, Fuel |
| Service Standards | - | Machine Performance, Undercarriage (Rubber Track Specifications, Steel Track Specifications, Common Specifications of Steel & Rubber Crawlers), Controls |
| Engine | - | Before You Begin Servicing, Special Service Tools, Measuring Instruments, Cylinder Head, Measuring and Adjusting Valve Clearance, Crankshaft and Camshaft Components |
| Electric System | - | Electric Equipment of Machine (Parts Layout of Electrical Equipment, LCD Monitor and Alarm Systems), Circuit Description of Engine Start and Stop (Battery Charge) |
| Hydraulic System | - | Outline (Control Valve Operation, Additional Operation of Control Valve) |
| Adjustment and Repair | - | Engine and Electric Equipment (Removal Reinstallation: Starter Motor, Radiator and Oil Cooler, Fan Belt) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Fuel filter filtration area | 432 sq.cm | p. 31 |
| Fuel filter replacement interval | Every 500h | p. 38 |
| Oil/water separator type | Mesh filter | p. 31 |
| Water separator inspection/servicing interval | Daily | p. 38 |
| Example hydraulic hose working pressure | 17.2 to 20.6 MPa | p. 17 |
| Example hydraulic hose length | 75 cm | p. 17 |
| Suction filter filtration area | 697 sq.cm | p. 28 |
| Suction filter filtration accuracy | 150 u | p. 28 |
| Cooling water hose clip 41 tightening torque | 2.45 to 2.94 N·m | p. 67 |
| Coolant hose replacement interval | Every 2000h / Every two years | p. 38 |
| Fan belt size | 36 | p. 31 |
| Fan belt pressing force | 98 N | p. 68 |
Yanmar ViO25-6L Common Problems This Manual Covers
Yanmar ViO25-6L hydraulic functions slow or erratic, bucket sluggish at full lever input
Check the hydraulic oil level first; the tank capacity is 25 L (page 40). Inspect all hoses and fittings for seeping fluid or damaged clamps. Verify system relief pressure is at 20.6 MPa (page 26). If suction filter service is past 500 hours, clean or replace it (page 38) before condemning the pump.
Manual Section: Hydraulic Pump TroubleshootingEngine hard to start or stalls immediately after firing in cold conditions
Drain and inspect the water separator daily (page 38); water contamination is the most common fuel-system fault on this machine. Replace the fuel filter every 500 hours (page 38), noting its 432 sq.cm filtration area (page 31). If the engine still cranks without firing, cross-reference the error code list.
Manual Section: Engine Troubleshooting (General)Coolant temperature rising fast, hoses feel soft or show seepage at clamp fittings p. 67
Inspect all coolant hoses for soft spots, cracks, and seepage at every clamp point. Torque hose clip 41 clamps to 2.45 to 2.94 N·m (page 67). Check the radiator cap against the 88.3 kPa spec (page 31). Schedule hose replacement at 2000 hours or two years, whichever arrives first (page 38).
Manual Section: Adjustment and RepairTravel speed drops noticeably and swing rotation becomes jerky or noisy under load
Verify hydraulic oil is at the full 25 L mark (page 40) before anything else. Check swing brake valve set pressure at 15.7 MPa (page 77); any drop points to valve wear. Confirm system relief is holding 20.6 MPa (page 26). Use the troubleshooting procedures to isolate motor versus control-valve fault.
Manual Section: Swing Motor TroubleshootingLCD monitor flickers or shows intermittent warnings, switches and controls respond erratically
Check the fuse panel first; blade fuses run 5 to 20 A and slow-blow fuses are 60 A (page 32). Trace suspect circuits against the wiring diagram. A weak battery is the next candidate: spec calls for a 12V JIS 65B24L unit (page 32) due for replacement at 2000 hours (page 38).
Manual Section: Electric SystemFan belt squealing on startup or after warmup, temperature gauge creeping toward red p. 68
Press the belt midspan with 98 N of force and measure deflection; correct slack is 10 to 15 mm (page 48). Adjust the tensioner until that spec is met using the procedure on page 68. Inspect the belt for glazing, cracks, and fraying while you are there. Service interval is every 500 hours (page 38).
Manual Section: Adjustment and RepairFrequently Asked Questions
How to reset Yanmar ViO25-6L monitor / display
The manual describes how to clear error conditions displayed on the LCD monitor. After resolving the cause of a failure, the error condition can be canceled by turning the starter switch OFF and then back ON.
Yanmar ViO25-6L error code meanings
The manual provides a comprehensive "Error Code List" in Section 5-4, detailing error codes, their descriptions, detection conditions, causes, and corrective measures. For example, error code 00 000091.00 indicates an "Accelerator sensor malfunction: above normal operating range (SAEJ1843)" with causes including connection failure or a defective accelerator sensor.
Yanmar ViO25-6L hydraulic trouble code reset
The manual does not differentiate between engine and hydraulic trouble code resets, providing a general procedure for clearing error conditions displayed on the LCD monitor. For errors like "Hydraulic oil temperature sensor malfunction" (e.g., 28 520777.02), the corrective measure is to turn the starter switch to the “OFF” position and then to the “ON” position to check if the error code is displayed again.
How to clear Yanmar ViO25-6L error code
After resolving the underlying cause of an error, the error code can be cleared by cycling the starter switch. The procedure involves turning the power OFF and then back ON using the starter switch.
Is this Service Manual a digital download?
A 554-page Service Manual in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Can I print this manual?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
Can I find wiring schematics in this Yanmar ViO25-6L manual?
Yes. You'll find full electrical schematics with wire routing diagrams, connector identification, and circuit descriptions.
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