Yanmar B20-2, B20-2A Crawler Excavator Service Repair Manual

General Cautions for Maintenance Work
Specifications
Weight of Main Parts
Servicing Standards of Machine Performance Control Devices
Engine Service Data
Hydraulic Oil Schematic
Hydraulic Pump
Pressure Adjustment
Electric Wirings
Electric Wiring Diagrams
Adjustment of 2-Speed Pedal

The individual assemblies of the manufacturer machine program and the functions of and adjustments to the installed units are described in this service manual. The hydraulics and electrics diagrams and sectional representations combined with the operating instructions and spare parts list should make maintenance and repair work easier.

Descriptions of work procedures and assembly steps were consciously omitted, because big repairs are generally performed by qualified and experienced workshop personnel, who are masters at this routine work.

Safety and cleanliness at the workstation is the highest priority when performing repairs. Using tools in perfect condition and generally replacing sealing components during each repair should be a matter of course.

Provided no special values are specified, screw connections are to be fastened with the usual tightening torques.