Hitachi EX5600-7B Workshop Manual page 37

Check Emergency Engine Stop Switch:
 If a fire breaks out, failure to release pressurized air inside
the hydraulic oil tank will escalate fire, hampering fire
fighting.
 Check the emergency engine stop switch function every
250 hours:
1) Start the engine and run it at slow Idle.
2) Press the emergency engine stop switch.
3) Confirm that engine stops and that pressurized air inside
the hydraulic oil tank is released (a hissing sound should
be heard).
 If any abnormalities are found, be sure to repair them
before operating the machine.
WKGB91-EN-01
SAFETY
SA-31