1.78 HYDRAULICS SINGLE BRAKE VALVE (MICO) (10) NOTE : Up to Machines S/No.51200471 only. 3. Refer to Page 1.66 and replenish the hydraulic tank before the engine is started. Removal 4. Bleed the brake system (refer to Page 1.95) and test the brakes. NOTE: The brake valve is fitted forward of the cab. Remove the front cover and any components as necessary to get access to the brake valve. 5. Purge the hydraulic system by starting the engine and operating all services to fully extend and retract cylinders several times. 1. Stop the engine and chock the machine, apply the parking brake . 6. Refer to Page 1.66, check the hydraulic level and replenish if necessary. 2.
Refer to page 1.1 and dump hydraulic pressure then disconnect the battery. 3. Make sure brake valve is free from dirt to avoid contamination of the hydraulic system. 4. Position a suitable container under the valve to collect any oil spillage during removal. 5. Make sure the hoses are identified before removal to help installation. 6. Remove the system pressure hose (2) from brake valve connector ‘P’. 7. Remove the return hose (3) from brake valve connector ‘T’. 8. Remove the service hose (4) from brake valve connector ‘A’. Take care not to lose the orifice located in the fitting. 9.
Remove the two attachment bolts (5) securing the brake valve (1) to the mounting bracket (6) and remove the brake valve. 10. Fit blanks to all openings on the brake valve and hoses to prevent the ingress of dirt. 1. Brake valve (10) 2. Pressure hose ‘P’ 3. Return hose ‘T’ 4. Service hose ‘A’ 5. Bolt 6. Bracket Installation 1. Installation is the reverse of removal. 2. Make sure that the spool of the brake valve is fully out. If necessary, adjust the brake pedal adjustment cap-screw inside the cab until the spool of the brake valve is fully out. Then torque tighten the cap-screw lock nut to 25-27 Nm (18-20 lbf/ft.). Torque tighten the components as follows: Bolt (5) – 25-27 Nm (18-20 lbf/ft.)