Part of the Yanmar Repair Manuals.
Put a pressure gauge on a ViO55-5 that travels weak on one side and this manual tells you what the reading should be and which adjuster to turn when it is not. It is the Yanmar factory service manual, publication A470608, for the ViO45-5, ViO45-5B, ViO55-5 and ViO55-5B mini excavators, serial numbers 50501 and after, with the 4TNV88-PBV and 4TNV88-BXB V engines.
Across 201 pages it moves from technical data and lifting capacities into service standards for the undercarriage, controls, cylinders and attachments, then a full engine section with troubleshooting, inspection and adjustment, lubrication, cooling and the fuel injection pump and governor, and finally the hydraulic system with circuit schematic, circuit operation and pressure adjustment.
For an owner or independent wrench, that is the difference between swapping parts on a hunch and setting the machine back to factory numbers before the crew loses a second day.
What's Inside This 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 |
