Need factory-level service data for your wheel excavator? This 356-page Yanmar B55W-1 shop manual PDF (OEM #023-00067E) addresses the full B55W lineup, including DD80L, Mega 130, and Mega 160, from counterweight removal to complete hydraulic system rebuilds. Inside: a complete hydraulic schematic, and a thorough troubleshooting and adjustment section covering the main pump, main control valve, pilot joysticks, travel motor, swing motor, and center joint swivel. You also get standard torque tables, swing reduction gearbox procedures, and drive axle and transmission service. Torque air cleaner hose clamps under 44 mm to 0.2-0.3 kg•m (20-30 in lb) and check your hydraulic filter daily during break-in, then weekly once the system stabilizes. Your machine is down and guessing costs hours. One-click download; search any spec by keyword and pull it up right at the excavator.
What's Inside This Yanmar B55W-1 Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 7-44 | Wheel Excavator Safety |
| Specifications | 45-62 | Specifications for B55W-1 |
| General Maintenance | 63-90 | General Maintenance Procedures, Standard Torques |
| Upper Structure | 91-124 | Counterweight, Fuel Transfer Pump, Swing Bearing, Swing Reduction Gearbox |
| Lower Structure and Chassis | 125 | Ram Lock Valve Operation |
| Engine and Drive Train | - | Drive Axle, Air Conditioner, Transmission, Drive Coupling |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Air cleaner hose clamp torque (Under 44 mm) | 0.2 - 0.3 kg•m (20 - 30 in lb) | p. 85 |
| Air cleaner hose clamp torque (Over 44 mm) | 0.5 - 0.6 kg•m (40 - 50 in lb) | p. 85 |
| Hydraulic filter check interval (initial) | every day | p. 325 |
| Hydraulic filter check interval (stabilized) | once a week | p. 325 |
| Battery weight | 24.4 kg | p. 57 |
| Engine Rated Output | 54.9 ps @ 2,400 rpm | p. 56 |
| Hydraulic Oil Capacity | 72 liters | p. 56 |
| Coolant Capacity | 11.5 liters | p. 56 |
| Counterweight Weight (B55W-1) | 234 kg | p. 95 |
| R134a Gas Weight (B55W-1) | 750 ±20 grams | p. 142 |
| Transmission Oil Change Frequency | Every 1000 hours | p. 157 |
| Boom Cylinder Drift Tolerance | 10 mm | p. 60 |
Yanmar B55W-1 Common Problems This Manual Covers
Yanmar B55W-1 hydraulic system pressure drops under normal load and boom lifts slowly. p. 61
Test the boom up speed. Measure the cycle time and verify it meets the 2.5 ±0.3 SEC standard listed on page 61. If the cycle is slow, check the hydraulic tank to ensure it holds the full 72 liters capacity on page 56.
Manual Section: SpecificationsUpper structure refuses to rotate or swing reduction gearbox generates excess heat and abnormal noise. p. 117
Inspect the swing reduction gearbox for broken gears or oil leakage using the troubleshooting procedures on page 117. Check the swing post allowable clearance and verify it does not exceed 0.20 mm as specified on page 59. Replace worn assemblies immediately.
Manual Section: Upper StructureCab air conditioner blows warm air and heavy frost accumulates directly on the condenser coils. p. 142
Check refrigerant pressure and inspect the expansion valve for defects. Evacuate the system and recharge the R134a gas to exactly 750 ±20 grams according to the specifications on page 142. Inspect all hoses for leaks before restarting the compressor.
Manual Section: Engine and Drive TrainEngine cranks excessively but refuses to fire or stalls constantly under heavy digging load. p. 85
Inspect the air cleaner intake for restrictions and replace clogged filters. Torque the air cleaner hose clamps over 44 mm to 0.5 - 0.6 kg•m as shown on page 85. Bleed the fuel system entirely to remove any trapped air.
Manual Section: General MaintenanceFrequently Asked Questions
How do you fix yanmar B55W-1 hydraulic system pressure drops under normal load and boom lifts slowly?
Test the boom up speed. Measure the cycle time and verify it meets the 2.5 ±0.3 SEC standard listed on page 61. If the cycle is slow, check the hydraulic tank to ensure it holds the full 72 liters capacity on page 56.
How do you fix upper structure refuses to rotate or swing reduction gearbox generates excess heat and abnormal noise?
Inspect the swing reduction gearbox for broken gears or oil leakage using the troubleshooting procedures on page 117. Check the swing post allowable clearance and verify it does not exceed 0.20 mm as specified on page 59. Replace worn assemblies immediately.
How do you fix cab air conditioner blows warm air and heavy frost accumulates directly on the condenser coils?
Check refrigerant pressure and inspect the expansion valve for defects. Evacuate the system and recharge the R134a gas to exactly 750 ±20 grams according to the specifications on page 142. Inspect all hoses for leaks before restarting the compressor.
How do you fix engine cranks excessively but refuses to fire or stalls constantly under heavy digging load?
Inspect the air cleaner intake for restrictions and replace clogged filters. Torque the air cleaner hose clamps over 44 mm to 0.5 - 0.6 kg•m as shown on page 85. Bleed the fuel system entirely to remove any trapped air.
What do I get after purchasing this Yanmar B55W-1 manual?
This is a 356-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.
Is this Yanmar B55W-1 Shop Manual printable?
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 B55W-1 manual include wiring diagrams?
No, while the Table of Contents lists an 'Electrical Schematic (B55W-1)' (S0892200), this section is not present within the provided 356 pages of the PDF document.
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