Every one of the 201 pages in this factory Yanmar ViO55-5B Service Manual PDF (OEM #A470608) focuses squarely on getting your ViO45-5, ViO45-5B, ViO55-5, or ViO55-5B excavator back in the dirt. You get complete hydraulic circuit schematics, detailed engine troubleshooting charts, and full electrical wiring diagrams for the entire machine. Open it up to find step-by-step teardown procedures, lifting capacity lists, and precise clearance charts for your undercarriage components. Lock down the travel motor to the track frame with 117.7 to 147.1 N-m of torque, and verify the hydraulic oil tank drain plug is tightened to exactly 78.0 ft-lbf (108.0 N-m) before refilling the system. Stop wasting time searching for hydraulic pressures on internet forums. Download this bookmarked file directly to your tablet, search for the exact specification you need, and get your machine running right.
What's Inside This Yanmar ViO45-5, ViO45-5B, ViO55-5, ViO55-5B Manual
| System | Pages | Key Topics |
|---|---|---|
| General Cautions for Maintenance Work | 9-20 | Correct Work, Safety Precautions, Preparations, Cautions for Disassembly and Reassembly, Cautions for Removal and Installation of Hydraulic Equipment |
| Technical Data | 21-57 | Specifications, Outline Drawing and Working Area (Canopy Type, Cabin Type), Weight List of Main Parts, Lifting Capacity List |
| Service Standards | 58-81 | Machine Performance, Engine, Undercarriage (Rubber Track Specifications, Steel Track Specifications, Common Specifications of Steel & Rubber Tracks), Controls |
| Engine | 82-159 | 4-1 General, 4-2 Troubleshooting, 4-3 Inspection and Adjustment, 4-4 Engine Body, 4-5 Lubrication System, 4-6 Cooling System, 4-7 Fuel Injection Pump / Governor |
| Hydraulic System | 160-201 | 5-1 Outline, 5-2 Hydraulic Circuit Schematic, 5-3 Circuit Operation, 5-4 Pressure Adjustment |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Travel motor × Track frame tightening torque | 86.8 to 108.5 ft·lbf (117.7 to 147.1 N·m) | p. 77 |
| Hose type 2 (SAE J517, 100R2) dia. 02 working pressure | 4264 PSI (29.4 MPa) | p. 16 |
| Drain plug 24 × Hydraulic oil tank tightening torque | 78.0 ft·lbf (105.8 N·m) | p. 77 |
| Hydraulic pump - Number of pumps | Piston pump: 2 + Gear pump: 2 | p. 23 |
Yanmar ViO45-5, ViO45-5B, ViO55-5, ViO55-5B Common Problems This Manual Covers
Yanmar ViO45-5 right stick and travel motor lose power compared with the left side p. 166
Test the right travel motor relief valve setting on page 166. Verify the piston pump P2 pressure reaches exactly 3128.4 PSI (21.6 MPa). If pressure drops below this specification, inspect the pilot control lines and the main control valve for internal leakage or damaged seals.
Manual Section: 5. Hydraulic SystemGrinding noise from undercarriage when tracking forward or reverse under heavy loads p. 77
Inspect the track frame and travel motor mounting bolts. Torque the travel motor to track frame fasteners to 86.8 to 108.5 ft·lbf (117.7 to 147.1 N·m) as specified on page 77. Check for damaged threads or sheer stress if the assembly remains loose.
Manual Section: 3. Service StandardsConstant fluid drip from the main boom cylinder lines during heavy lifting operations p. 16
Check the high pressure lines for pinhole leaks or jacket wear. Replace any damaged 02 diameter SAE J517 100R2 hoses, ensuring they meet the required 4266 PSI (29.4 MPa) working pressure limit noted on page 16. Clean the fittings before installation.
Manual Section: 1. General Cautions for Maintenance WorkHydraulic oil appears milky or contains heavy metal particulate in the sight glass p. 77
Drain the hydraulic tank completely and inspect the bottom for sludge. Reinstall the drain plug 24 and torque it precisely to 78.0 ft·lbf (108.0 N·m) using the specifications on page 77. Fill the system with fresh fluid and bleed the air.
Manual Section: 3. Service StandardsFrequently Asked Questions
How to reset the Yanmar ViO45-5 hydraulic lockout?
The manual describes the hydraulic lockout as a 'Safety Lock' function. When the lock lever is in the 'LOCK' position, the spool of the inlet section is in the neutral position, preventing oil supply to any sections and stopping cylinder and motor operation.
What are the replacement specifications for Hydraulic control components?
The manual provides pressure adjustment specifications for hydraulic control components, which are critical for their proper function. For the ViO45-5 model, the System relief valve R1, R2, and R3 should be set to 3128 (21.6) PSI (MPa). Various circuit relief valves, such as the Boom (rod end), are specified at 3555 (24.5) PSI (MPa). These values are used to ensure correct operation and would indicate a need for service or replacement if they cannot be met.
What are the replacement specifications for Travel motor components?
The manual lists technical data for the travel motor, including its type (Fixed displacement piston motor or Variable displacement piston motor) and brake valve relief set pressure. For both ViO45-5 and ViO45-5B models, the travel motor brake valve relief set pressure is 3128 (21.6) PSI (MPa). Additionally, the tightening torque for the travel motor to the track frame is specified as 86.8 to 108.5 ft-lbf (117.7 to 147.1 N•m).
What is the standard total volume for engine oil in the Yanmar ViO45-5 and ViO55-5B excavators?
The standard total volume for engine oil in both the Yanmar ViO45-5 and ViO55-5B excavators is 9.4 Qts. (8.9 L). It is important to check the oil level on the dipstick and ensure it is between the upper and lower limit lines during inspection.
What is the standard valve clearance for the engine?
The standard valve clearance for the engine is specified as 0.006 to 0.01 inches (0.15 to 0.25 mm). This clearance should be measured and adjusted according to the procedure outlined in the manual, ensuring the engine is cold during the measurement.
What is the standard tension for the fan belt?
The standard tension for the fan belt is 0.39 to 0.59 inches (10 to 15 mm) of deflection when a force of 72.3 lbf (98 N) is applied. If the deflection is outside this range, the V belt tension should be adjusted using the alternator adjuster.
How will I receive this Service Manual?
A 201-page Service Manual in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Is this Yanmar ViO45–ViO55 Series Service Manual printable?
No copy protection at all. The PDF is DRM-free, so print whatever sections you need to take to the shop. Standard letter or A4 paper works.
Document Quality
This document is a native digital PDF, ensuring excellent clarity and full text searchability. All text is crisp and easy to read, with no blurriness or fading. Diagrams and illustrations, including exploded views and hydraulic schematics, are consistently sharp and appear to be vector-based, allowing for clear viewing at any zoom level, and all labels are perfectly readable. The pages are clean, free from any scan artifacts, stains, or skewed content, and there are no notable blank or filler pages.
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