1.98 HYDRAULICS CONTROL VALVE (25) Removal 1. Stop the engine and chock the machine, apply the parking brake . 2. Refer to page 1.1 and dump hydraulic pressure then disconnect the battery. 3. Remove the rear cover from the boom. 4. Remove the rear service plate for access, if necessary. 5. Make sure control valve is free from dirt to avoid contamination of the hydraulic system. 6. Vent the accumulator. 7. Identify and label the electrical connectors. Disconnect the electrical connectors and fit blanks to the connectors and valve. 8. Position a suitable container under the valve to collect any oil spillage during removal. 9. Identify and label the hoses.
Disconnect all hoses from the control valve and blank open connections on valve and hoses. Tie hoses clear of valve. 10. Remove the bolts securing the valve mounting plate to the rear bulkhead plate. Remove the valve and mounting plate from the machine. Installation 1. Installation is the reverse of the above procedure. 2. Make sure all hoses and electrical connectors are connected to the correct service. 3. Refer to Page 1.66 and replenish the hydraulic tank before the engine is started. 4. Purge the hydraulic system by starting the engine and operating all services to fully extend and retract cylinders several times. 5.
Refer to Page 1.66, check the hydraulic level and replenish if necessary. 6. Check the main system pressure and set the pressure relief valve if necessary.