TCM FD35C9 - Page 220

3-106
Fig. 3.342
⑧ Remove the ball nut assembly from the gear
box carefully. Make sure to keep the ball nut
assembly horizontally at all times. If it is
turned vertically, the ball nut may fall off by
itself and get damaged, which will prevent the
ball nut assembly from operating properly.
■ INSPECTION
Clean all the disassembled metal parts in clean oil. The “O”-rings and oil seals must be replaced with
new ones. After cleaning those metal parts, check them for scratches, wear, or cracks. Place them in a clean
location to keep them free of dust and dirt.
① Replace the “O”-rings and oil seals with new ones. Replace the side cover bushing with a new one if it
is damaged or worn.
② Check the ball nut operation. If it fails to operate smoothly, clean it by operating it in a oil bath. Also
check the threads on the nut for stripping, nicks, indentations, or abnormal wear. If any defects are
found, replace the ball nut assembly with a new one.
③ Check the sector shaft gear teeth for scoring. Also check the sector shaft for excessive wear. Replace as
needed.
④ Check the radial bearings of the gear box assembly and the side cover bushing for wear. Replace any
defective parts with new ones.
⑤ Check the radial bearings in the top cover. If any damage is found, replace them with new ones.
⑥ Check the control valve as follows:
1) Checktheinnersurfaceofthevalvehousing,payingspecialattentiontotheorice,fordents.Ifany
defects are found, replace the complete control valve assembly with a new one.
2) Checkthespool’souterdiameterandtheoricefordentsordamage.Replaceanydefectivepartswith
new ones.
3) Check all the springs for cracks or breaks. Replace any defective spring with a new one.
4) Check to see if the reaction pistons slide smoothly in the valve housing. If defective, replace the
complete valve assembly with a new one.