This is the factory Yanmar service manual for the B75W wheeled excavator. The B75W runs a Deutz TCD 2.9 L4 diesel rated at 55.4 kW (75.3 HP), and the manual carries the real shop values you need: working hydraulics safety valve at 280 bar, travel-drive high pressure at 480 bar, pilot control supply at 30 bar, and the lock and unlock pressures for both the Lehnhoff HS08 and CSERI HCSW08 quick-mount hitches. It is organised into twelve sections, from Technical Data and the diesel engine through the hydraulic, travel, steering and brake systems, the electrics, maintenance, repair instructions, and the diagnosis and special-tools section, so a technician can move from a specification to the procedure that uses it across 912 pages.
What's Inside This Yanmar B75W Manual
| System | Pages | Key Topics |
|---|---|---|
| General | Manual Use, Safety, Model Identification, Abbreviations | |
| Technical Data | Engine, Hydraulic, Travel, Steering and Brake Specifications, Pressures, Capacities | |
| Diesel Engine | Deutz Tcd 2.9 L4 Service, Valve Clearance, Fuel Injection, Cooling | |
| Hydraulics | Main and Gear Pumps, Control Valves, Working and Pilot Pressures, Cylinders | |
| Setting Instructions | Pressure Settings, Valve Adjustments, Calibration Values | |
| Function Description | How the Hydraulic, Travel and Work Circuits Operate | |
| Electrics | Battery, Generator, Starter, Lighting, Sensors, Wiring | |
| Maintenance | Service Intervals (50, 250, 500 Hour), Fluids, Filters, Lubrication | |
| Operation | Controls, 20 and 30 km/h Travel Ranges, Quick-Mount Hitch Operation | |
| Options | Lehnhoff HS08 and Cseri HCSW08 Quick-Mount Hitch Circuits, Attachments | |
| Repair Instructions | Component Removal, Disassembly and Reassembly Procedures | |
| Diagnosis and Tools | Fault Diagnosis, Special Tools, Test Procedures |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Engine | Deutz TCD 2.9 L4, 4-cylinder diesel | |
| Engine power (ISO 3046) | 55.4 kW / 75.3 HP | |
| Bore / stroke | 92 / 110 mm | |
| Total displacement | 2.925 L | |
| Working hydraulics safety valve | 280 bar | |
| Working pump supply volume (main pump) | 138 l/min | |
| Pilot control supply pressure (high idle) | 30 +2 bar | |
| Travel drive high pressure (relief valve) | 480 bar | |
| Travel drive displacement motor (max) | 55 cc/rev | |
| Travel speed (30 km/h version) | Gear 1: 0-6.0/0-17 km/h, Gear 2: 0-11/0-30 km/h | |
| Quick hitch HS08 Lehnhoff (lock / unlock) | 50 bar / 220 bar | |
| Quick hitch HCSW08 CSERI (close / open) | 120 bar / 150 bar | |
| Driving brake inching (start / end) | 5 / 25 bar |
Yanmar B75W Common Problems This Manual Covers
Engine overheating with coolant loss
Overheating with coolant loss on the Deutz TCD 2.9 usually points to a cylinder-head or nozzle gasket leak. Use the Diesel Engine section to pressure-test the cooling system, inspect the head and nozzle gaskets, and confirm the thermostat and fan operation before pulling the head. Catching a gasket leak early keeps it from washing a cylinder or warping the head.
Manual Section: Diesel EngineLow hydraulic pressure or boom drift
Boom drift or weak hydraulics is usually a worn cylinder seal, a leaking control-valve section, or a relief setting that has drifted. Verify the working safety valve at 280 bar and the pilot supply at 30 bar against the Setting Instructions first, then check the cylinder and valve for internal leakage. Confirming the settings before reseal work tells you whether it is a setting or a seal.
Manual Section: HydraulicsEngine misfire or loss of power at idle
Rough idle or power loss often traces to valve clearance out of spec or an injection fault on the Deutz engine. Set the valve clearances to the Diesel Engine specification and check the injection timing and the injectors for an abnormal spray pattern. Working in that order separates a simple clearance adjustment from an injection-component repair.
Manual Section: Diesel EngineFrequently Asked Questions
What engine is in the Yanmar B75W?
The B75W is powered by a Deutz TCD 2.9 L4 four-cylinder diesel rated at 55.4 kW (75.3 HP) to ISO 3046, with a 92 by 110 mm bore and stroke and 2.925 L displacement. The manual covers its service, valve clearance, fuel injection, and cooling in the Diesel Engine section.
What are the working hydraulic and travel-drive pressures on the B75W?
The working hydraulics safety valve is set at 280 bar with pilot control supply at 30 bar at high idle, and the travel-drive high pressure relief is 480 bar. The main pump supplies 138 l/min. All of the settings, including the secondary cylinder pressures, are listed in Technical Data and the Setting Instructions.
What are the quick-mount hitch pressures for the B75W?
The B75W can be fitted with two quick-mount hitches. The Lehnhoff HS08 locks at 50 bar and unlocks at 220 bar, while the CSERI HCSW08 closes at 120 bar and opens at 150 bar. The hitch hydraulic circuits and their settings are covered in the Options and Setting Instructions sections.
What travel speeds does the B75W have?
The B75W is offered in 20 km/h and 30 km/h versions. The 30 km/h version has two gear stages, giving 0 to 17 km/h in stage 1 and up to 30 km/h in stage 2, with the matching prop-shaft speeds listed per tire size in Technical Data.
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