1.94 HYDRAULICS Assembly Use a repair kit when assembling the valve, the repair kit contains new O-rings. Before assembly, lightly lubricate the parts from the repair kit and the spools and sleeves with clean hydraulic oil. Make sure all parts are clean before assembly. 1. Install new O-rings (6*) on large diameter end of sleeve (7) and a new O-rings (8*) on smaller diameter end of sleeve (7). 2. Carefully install spool (9) into sleeve (11). Note direction of spool. 3. Install spacer (10) into housing (11) bore through end plug (4) end of housing. Note direction of spacer. 4. Carefully install sleeve (7) and spool (9) assembly into housing (11) bore using a wooden dowel.
Note direction of assembly. 5. Install spring (5) into housing (11) bore. 6. Install end plug (4) and torque load to 10.9-20.3 Nm (96-180 lbf/in.) to seat sleeve. Then loosen end plug ј turn and torque load to 1.1-6.0 Nm (10-60 lbf/ in.). 7. 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.). 8. Install new O-rings (14*) on sleeve (15). Carefully insert spool (13) into sleeve (15). 9. Install ball (12) on top of spool (9), already in housing. Install sleeve (15) assembly in housing (11) bore. 10. Carefully install base (16) over sleeve (15) while aligning cap screws (17) with holes in housing (11). 11.
Test the brake pressure at connector A on trailer brake valve. Pressure can be adjusted by adding or removing shims (17) to retainer assembly (16). Torque load cap screws to 29.8 33.9 Nm (22-25 lbf/ft.).