5.2.2 INSPECTION

(8) Carefully remove the ball nut assembly from the gear box. Keep the ball nut horizontal at all times. Failure to do so will damage the ball scooping area, resulting in the malfunction of the ball nut assembly.

Fig. 5.18

5.2.2 INSPECTION

Clean all the disassembled metal parts in cleaning oil and prepare new "O"-rings and oil seals. After cleaning, inspect all parts for scratches or scores, wear or cracks. Put them in a place free from dust and dirt until reinstallation.

(1) Replace the "O"-rings and oil seals with new ones. Check the side cover bushings for damage or wear, replacing any defective ones.

(2) Operate the ball nut assembly to see if it is operating normally. If not, clean it, slowly operating in cleaning oil. Replace the ball nut assembly when the threaded grooves show sign of flaking, dent, or undue wear.

(3) Inspect the sector shaft for evidence of excessive scores on the gear teeth or undue wear on the shaft.

Replace the sector shaft if defective.

(4) Inspect the radial bearing and side cover bushing in the gear box assembly to see if they are excessively worn. Replace if necessary.

(5) Inspect the radial bearing inside the top cover for defect. Replace if necessary.

(6) Inspecting the control valve

① Inspect the valve housing inner surface, especially the orifice areas for sign of battering or damage. If unsatisfactory, replace the control valve assembly. ② Inspect the spool diameter and orifice areas for sign of battering and damage. If unsatisfactory, replace the spool. ③ Inspect the spring for cracks or breakage, replacing the spring if defective. ④ Check whether the reaction piston is sliding smoothly inside the valve housing. If unsatisfactory, replace the valve assembly.