Need the factory procedures for your Yanmar ViO26-6 excavator? This 469-page service manual puts hydraulic circuit schematics, wiring diagrams, and full engine rebuild procedures directly in your hands. Inside: fluid routing for the main pump, control valve, swing motor, and travel motor; circuit descriptions covering engine start/stop and the automatic deceleration system; error code lists; and pressure adjustment procedures for every relief valve on the machine. You also get torque tables for hydraulic fittings and a step-by-step section on fuel injection timing and valve clearance adjustment. The main system relief sets to 21.0 MPa, boom circuit relief to 24.0 MPa at the rod end; torque your track roller bolts to 206-245 N•m. Your ViO26-6 is down and every hour costs you. Bookmarked by section and keyword-searchable, it opens on any device. Pull it up on your tablet and start wrenching.
What's Inside This Yanmar ViO26-6 Manual
| System | Pages | Key Topics |
|---|---|---|
| General Cautions for Maintenance Work | 10-21 | Correct Work, Safety Precautions, Preparations, Cautions for Disassembly and Reassembly, Cautions for Removal and Installation of Hydraulic Equipment |
| Technical Data | 22-47 | 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 | 48-79 | Machine Performance, Engine, Undercarriage (Rubber Track Specifications, Steel Track Specifications, Common Specifications of Steel & Rubber Crawlers), Controls |
| Engine | 80-215 | 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 | 216-239 | 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 | 240-357 | 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 | 358-453 | 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 | 454-461 | 8-1 Non-Breakdowns |
| Page Vierge | 462-469 | 8-2 Quick Reference Table for Troubleshooting |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| System relief set pressure P1 | 21.0 MPa | p. 26 |
| Circuit relief set pressure Boom (at rod end) | 24.0 MPa | p. 26 |
| Track roller bolt tightening torque | 206 to 245 N•m | p. 69 |
| Hydraulic hose (Suction hose x Tube) hose clip tightening torque | 2.6 to 2.7 N•m | p. 68 |
| Hydraulic hose (Cooling water hose) hose clip tightening torque | 2.5 to 3.5 N•m | p. 68 |
| Suction filter filtration area | 1120 cm² | p. 28 |
| Suction filter filtration accuracy | 75 u | p. 28 |
| Fuel filter filtration area | 432 cm² | p. 31 |
| LO filter filtration area | 800 cm² | p. 31 |
| LO filter valve opening pressure | 0.08 to 0.12 MPa | p. 31 |
| Rubber track standard width | 250 mm | p. 29 |
| Rubber track lug height | 24 mm | p. 29 |
Yanmar ViO26-6 Common Problems This Manual Covers
Yanmar ViO26-6 hydraulic pump output drops, boom lifts slow or won't reach full speed under load p. 240
Check hydraulic fluid level in the 25 L tank (page 28), then measure system relief pressure; spec is 21.0 MPa (page 26). Inspect the return filter: its bypass valve opens at 0.15 MPa when clogged, masking actual pump output. Work through the troubleshooting section starting on page 454 to narrow the fault to pump, control valve, or relief.
Manual Section: Hydraulic SystemHydraulic oil leaks from hoses or fittings after service, puddle under machine at startup p. 10
Torque suction hose clips to 2.5 to 3.5 N•m and oil cooler hose clips to 2.5 to 3.5 N•m (page 68). Use two wrenches on high-pressure fittings to prevent hose twist. Inspect all O-rings in seal grooves for cuts or contamination before reassembly. After tightening, pressurize the circuit and walk every joint; any seep means pull and reseal.
Manual Section: General Cautions for Maintenance WorkEngine hard to start, turns over slowly in cold weather or loses power under full digging load p. 80
Drain water from the fuel filter separator before anything else. Contaminated fuel kills injection pressure fast. Check fuel injection valve opening pressure; spec is 12.3 to 13.3 MPa (page 58). Verify intake valve clearance is 0.2 mm cold. If the engine still won't pull, run through the engine troubleshooting steps on page 80 before disassembling injectors or checking compression.
Manual Section: EngineMachine pulls left or right during travel, one track noticeably slower than the other p. 48
Check rubber track tension on both sides; correct sag is 8 to 13 mm (page 71). Uneven tension alone causes pull without any motor fault. If tension matches, consult the adjustment and repair section on page 358, focusing on the counter balance valve and anti-cavitation valve. Torque any loose track roller bolts to 206 to 245 N•m (page 69).
Manual Section: Service StandardsEngine overheats or coolant level drops unexpectedly, temperature gauge climbs during digging p. 80
Inspect all coolant hoses for cracks and loose clamps; torque clips to 2.5 to 3.5 N•m (page 68). Check coolant level cold before startup. A steady drop points to a seeping hose or head gasket. Pressure-test the circuit to find the source, then follow the cooling system checks in the engine section on page 80.
Manual Section: EngineFrequently Asked Questions
How do I clear the error code on a YANMAR ViO26-6?
After resolving the cause of a machine failure, the error condition can be canceled by turning the starter switch to the "OFF" position and then back to "ON". This action allows the system to recheck and clear the displayed error code.
What does the alarm or warning code mean on a YANMAR ViO26-6?
The meaning of alarm or warning codes can be found in the "5-4 Error Code List" section. This section provides a table that includes the error code, its classification, a description of the error, detection conditions, causes, and corrective measures.
How do I reset the throttle or idle settings on a YANMAR ViO26-6?
The manual states that you should NEVER attempt to adjust the low or high idle speed limit screw, as this may impair safety and performance. If adjustment is required, you must consult an authorized Yanmar industrial engine dealer or distributor.
How to check diagnostic codes on YANMAR ViO26-6
Diagnostic codes, referred to as error codes, are displayed on the LCD screen in the event of a machine failure. These codes correspond to specific failures, and for detailed information on their meaning, you should refer to Section "5-4 Error Code List".
What do I get after purchasing this Yanmar ViO26-6 manual?
This is a 469-page searchable PDF ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Am I able to print pages from this manual?
There are no print restrictions. The PDF is DRM-free — print whatever sections you need for the shop. Standard letter or A4 paper works.
Does this Yanmar ViO26-6 Service Manual cover the hydraulic system?
Full hydraulic system diagrams are included, covering circuits, valve locations, and hydraulic component specs for the Yanmar ViO26-6.
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