Part of the Yanmar Repair Manuals.
Before you put a gauge on a B55W-2 that goes weak after an hour of work, you need the relief pressures, and guessing at them costs a crew their afternoon. This service manual for the Yanmar B55W-2 wheel excavator (serial number 5001 and up) puts those figures on a specifications page alongside brake, swing and accumulator values.
Across 994 pages it works through the 4TNV98-E engine, transmission, axles and ram lock valve, swing bearing, cylinders, main control valve, swing and travel motors, the full electrical schematic, and the boom, arm and bucket. Hydraulic troubleshooting tables pair each symptom with a cause and a remedy, and torque and clearance data back up the wrench work.
The PDF is bookmarked at 825 points, so the trip from download to the exact page you need is a few clicks, not an evening of scrolling.
What's Inside This Yanmar B55W-2 Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 9-54 | Wheel Excavator Safety (Safety Precautions, Applicable Models, To the Operator of a Excavator, Location of Safety Labels, Summary of Safety Precautions for Lifting in Working Mode, Unauthorized Modifications, Before Starting Engine, Machine Operation, Maintenance, Battery, Towing, Shipping and Transportation, Lifting with Sling) |
| Specifications | 55-86 | Specification for DX55W |
| General Maintenance | 87-126 | General Maintenance Procedures, Standard Torques |
| Upper Structure | 127-184 | Cabin, Counterweight, Fuel Tank, Fuel Transfer Pump, Swing Bearing |
| Lower Structure and Chassis | 185-258 | Ram Lock Valve, Axle |
| Engine and Drive Train | 259-582 | Engine, Transmission, Drive Coupling (Main Pump) |
| Hydraulics | 583-905 | Hydraulic System Troubleshooting, Testing and Adjustment, Accumulator, Center Joint, Cylinders, Main Control Valve, Swing Motor, Travel Motor |
| Electrical System | 906-970 | Electrical Schematic (DX55W) |
| Attachments | 971-994 | Boom and Arm, Bucket |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Hydraulic filter filtering grain size | 10μ (rated) or smaller | p. 737 |
| Hydraulic filter replacement interval | every 250 hours (after initial 50 hours) | p. 739 |
| Fuel filter replacement interval | every 500 hours (after initial 50 hours) | p. 342 |
| Fuel filter tightening torque | 14 - 17 ft·lb (19.6 - 23.5 N·m; 2.0 - 2.4 kgf·m) | p. 332 |
| Engine oil filter replacement interval | every 500 hours (after initial 50 hours) | p. 345 |
| Air cleaner element cleaning air pressure | 42 -71 psi (0.29 -0.49 MPa; 3.0 -5.0 kgf/cm2) | p. 337 |
| Air cleaner element replacement interval | every 500 hours | p. 342 |
| Fuel and coolant hoses replacement interval | every two years | p. 351 |
| O-rings and seals replacement recommendation | replace whenever the assembly is being overhauled or re-assemble | p. 631 |
| Travel Motor Taper roller bearings replacement criteria | replace body assembly if damaged or not smooth | p. 767 |
| Oil temperature abnormally high cause and remedy (Oil cooler clogged or air circulation to cooler blocked) | Clean | p. 608 |
| Oil temperature abnormally high cause and remedy (Cooling fan belt tension too loose) | Readjust belt tension | p. 608 |
