Yanmar B95W - Diagnosing and Rectifying General Malfunctions

B95W
Troubleshooting
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10.3 Troubleshooting and fault rectification
10.3.1 General malfunctions
Fault Machine fails to drive
Cause • Left-hand armrest control panel lifted or switch defective
• Pilot pressure too low or no pilot pressure at all
• Low hydraulic oil level
• Hydraulic pump has failed
Corrective
measure
 Lower armrest panel.
 Check pilot pressure
 Top up the hydraulic oil to the mark
 Have pump checked by specialist and replace if necessary
Fault Poor travel performance
Cause • Engine output is insufficient
• Pump has insufficient output
Corrective
measure
 Check diesel engine
 Check the pump and replace if necessary
Fault Excavator equipment not working
Cause • Toggle switch for working hydraulics set to “OFF”
• Left-hand armrest control panel lifted or switch defective
• Switch on armrest panel defective
• Oil supply to hydraulic pump interrupted
• Hydraulic pump has failed
• Main relief valves have failed
• Maintenance cover folded down
• Switch on maintenance cover defective
Corrective
measure
 Switch the working hydraulics toggle switch
 Lower armrest panel
 Check the switch and repair or replace if necessary
 Check lines
 Have hydraulic pump checked by a specialist and replace, if necessary
 Check main relief valves and replace, if necessary
 Close maintenance cover
 Repair or replace maintenance cover switch