HYDRAULICS
1.92 TRAILER BRAKE VALVE (47) Removal NOTE: A trailer brake valve is fitted on the forward surface of the rear service plate. Remove the rear cover from the boom and the rear service plate, if necessary to get access to the valve. 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. Make sure valve is free from dirt to avoid contamination of the hydraulic system. 4. Identify and label the hydraulic hoses. 5. Position a suitable container under the valve to collect any oil spillage during removal. 6. Disconnect the service hoses (2), pilot hose (3), pressure hose (4) and return hose (5) from the valve and blank open connections on valve and hoses. Tie hoses clear of valve. 7. Remove the two hex: head screws (7) and washers (8) securing the valve to the rear bulkhead plate. Remove the valve (1) from the machine.
Installation 1. Installation is the reverse of the above procedure. 2. Refer to Page 1.66 and replenish the hydraulic tank before the engine is started. 3. Bleed the brake system (refer to Page 1.95) and test the brakes. 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.
1. 2. 3. 4. 5. 6. 7. 8.
Trailer brake valve (47) Service hose Pilot hose Pressure hose Return hose Bleed point Hexagon headed screw Washer
