What to do if only one actuator is inoperable on Hitachi ZAXIS 135US-5B?
- WWilliam BensonSep 5, 2025
If only one actuator is inoperable on your Hitachi Excavators, it could be due to: * Broken control valve spool: Replace the spool. * Embedded foreign matter in valve spool: Repair or replace the valve spool. * Broken pipe and/or hose: Repair or replace the pipe and/or hose. * Loose pipe line joint: Retighten the joint. * Broken O-ring at pipe line joint: Replace the O-ring. * Broken actuator: Repair or replace the actuator. * Faulty pilot valve: Replace the pilot valve. * Faulty pilot circuit line: Repair or replace the pilot circuit line. * Faulty pilot solenoid valve: Repair or replace the pilot solenoid valve.