1.80 HYDRAULICS SINGLE BRAKE VALVE (MICO) (10) - Assembly Use a repair kit when assembling the valve, the repair kit contains a new cup, boot and O-rings. Before assembly, lightly lubricate the parts from the repair kit and the spool and sleeve with clean hydraulic oil. Make sure all parts are clean before assembly. 1. Install a new cup (10*) in spacer (11) and one new O-ring (8*) on spacer (11). Note direction of cup. 2. Install two new O-rings (6*) on large diameter end of sleeve (7) and new O-ring (8*) on small end of sleeve (7). 3. Carefully install spool (9) into sleeve (7). Note direction of spool. 4. Install sleeve (7) and spool (9) assembly into housing bore using a wooden dowel.
Note direction of assembly. Install spring (5) into housing bore. 5. Install end plug (4) and torque load to 10.9-20.3 Nm (96-180 lbf/in.) to seat sleeves. Then loosen end plug ј turn and torque load to 1.1-6.0 Nm (10- 60 lbf/in.). Install new O-ring (3), washer (2) and nut (1). Hold the end plug (4) with a wrench and torque load nut to 68.1-81.4 Nm (50-60 lbf/ft.). 1. Nut 11. Spacer 2. Washer 12. Housing 3*. O-ring 13. Retainer assembly 4. End plug 14. Shim(s) 5. Spring 15**. Spring 6*. O-ring 16. Spring 7. Sleeve 17. Spring 8*. O-ring 18. Bearing 9. Spool 19. Piston 10*. Cup 20*. Boot 6. Install retainer assembly (13) in housing. NOTE: Depress retainer (13) until it bottoms on spacer (11).
Spool (9) and retainer (13) should return when released. If the spool and retainer do not return when released, the bore of sleeve (7) may be damaged. * Included in repair kit ** Not used in all models 7. Install shim(s) (14), springs (15**), (16) and (17) and piston (19) in housing bore. NOTE: Not all models use spring (15**). Some models also use a 6.35 mm (0.25 in.) spacer with shims. Make sure the same number of shims and the spacer, that were removed during dismantling, are installed. 8. Install new boot (20*) on housing. 9. Test the brake pressure at service hose A on brake valve. Pressure can be adjusted by adding or removing shims (14) to retainer assembly (13).