Part of the Yanmar Repair Manuals.
Need the factory service data for your Yanmar ViO27-2 or ViO35-2 excavator? This 584-page service manual covers both machines: hydraulic circuits, electrical systems, undercarriage, engine internals, and the components that fail hardest in the field. Inside: full hydraulic circuit schematics with pressure adjustment procedures, wiring diagrams for the complete electrical system, torque tables covering machine and engine fasteners, and a full troubleshooting section that addresses both non-breakdown symptoms and root-cause diagnosis. You also get step-by-step teardown procedures for the hydraulic pump, control valve, swing motor, and travel motor. Replace the fuel filter element every 200 hours and match any hose to SAE J517, 100R1 at 0.25-inch (6.3 mm) inner diameter. Factory numbers, not estimates. Your machine is down. Get the right spec on the first try. Bookmarked by section; search any torque value or schematic by keyword, on laptop or tablet.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General Cautions for Maintenance Work | 8-19 | Correct Work, Safety Precautions, Preparations, Cautions for Disassembly and Reassembly, Cautions for Removal and Installation of Hydraulic Equipment |
| Technical Data | 20-48 | Specifications, Outline Drawing and Working Area (Canopy Type, Cabin Type), Weight List of Main Parts, Lifting Capacity List |
| Service Standards | 49-78 | Machine Performance, Engine, Undercarriage (Rubber Crawler Specifications, Steel Crawler Specifications, Common Specifications of Steel & Rubber Crawlers), Controls |
| Engine | 79-121 | Measurement, Inspection, Adjustment, Reassembly Procedures for Engine Components |
| Hydraulic System | 122-165 | Circuit Outline, Hydraulic Circuit Schematic, Circuit Operation, Pressure Adjustment |
| 6-1 Hydraulic Pump | 167-226 | Removal and Reinstallation, Disassembly and Reassembly, Torque Specs, Three Bond Adhesive Application |
| 6-2 Control Valve | 227-276 | Spool Operation, Removal and Reinstallation, Disassembly and Reassembly, Relief Valve Adjustment |
| 6-3 Pilot Valve | 277-286 | Removal and Reinstallation, Disassembly and Reassembly, Pilot Pressure Specs |
| 6-4 Swing Motor | 287-319 | Removal and Reinstallation, Disassembly and Reassembly, Relief Valve, Swing Speed Verification (10 RPM) |
| 6-5 Travel Motor | 320-404 | Removal and Reinstallation, Disassembly and Reassembly, Speed Change Valve, Travel Motor Relief |
| 6-6 Pilot Check Valve (Quick Coupler Type) | 405-412 | Removal and Installation, Quick Coupler Hydraulic Circuit, Pilot Check Valve Disassembly |
| Adjustment and Repair | 413-536 | Electrical Equipment of Machine and Engine, Undercarriage, Controls, Swing Bearing, Hydraulic Equipment, Work Implements, Cabin |
| Periodic Inspection and Servicing | 537-539 | Periodic Inspection Schedule, Service Intervals, Filter Replacement Intervals |
| Fuel, Lube Oil and Grease Recommended | 540-541 | Fuel Specification, Engine Oil Grade, Hydraulic Oil Grade, Grease Type Recommendations |
| Troubleshooting | 542-581 | Non-Breakdown Symptoms, Root-Cause Troubleshooting for Hydraulic, Electrical and Mechanical Faults |
| Reference Data | 582-583 | Specifications for Attachment, Boom and Arm Dimensional Reference |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| ViO27-2 | ||
| Fuel filter filtration area | 67.0 (432) sq.in. (sq.cm) | p. 26 |
| Fuel filter filtration accuracy | 150 Meshes | p. 24 |
| Air cleaner filtration area | 9.7 (0.9) sq.ft. (sq.m) | p. 26 |
| Overall length (Transportation position), ViO27-2 | 162.6 in. | p. 21 |
| ViO35-2 | ||
| Air cleaner filtration area | 9.7 (0.9) sq.ft. (sq.m) | p. 33 |
| Overall length (Transportation position), ViO35-2 | 180.9 in. | p. 28 |
| All Models | ||
| Hydraulic hose (SAE J517, 100R1) Inner dia. (Hose dia. 02) | 0.25 (6.3) in. (mm) | p. 15 |
| Hydraulic hose (SAE J517, 100R1) Outer dia. (Hose dia. 02) | 0.53 (13.5) in. (mm) | p. 15 |
| Minimum ground clearance | 12.6 in. | p. 21 |
| Swing speed | 10 rpm | p. 22 |
| Hydraulic oil tank capacity | 11.1 Gals | p. 24 |
| Intake valve clearance (Cold engine) | 0.0079 in. | p. 26 |
