Assembly -706880894

TM 5-4210-233-14&P-1

5-39. STEERING GEAR-Continued

(9) Inspect the sector shaft (2) bearing and sealing areas and sector teeth contact surfaces for

brinelling or spalling. Run your fingernail edge across these areas to detect steps. Inspect also for

cracks. Remove any masking tape from the shaft serrations and inspect for twisted or otherwise

damaged serrations. If any of these conditions exist, replace the sector shaft.

(10) Inspect the sector shaft assembly for damaged adjusting screw (8) threads. The staked retainer

(24) must be locked in place, and have no cracks. The adjusting screw must rotate by hand with no

perceptible end play (lash). Replace adjusting screw, if damaged. Replace the retainer, if

damaged, or if the adjusting screw requires replacement or adjustment.

(11) Inspect the thrust bearing (39) rollers for any deterioration. Inspect the two thrust washers (38) for

brinelling, spalling, or cracks. Replace any part with these conditions.

Assembly.

CAUTION

Be sure the compression tool is assembled correctly before

assembly of the seal ring. If the tool is backwards it cannot

be pulled over the new seal ring for compression or for tool

removal without destroying the seal ring.

Allow for the 10 minutes to insure that the O-ring and seal

are properly seated when you install the worm shaft into the

rack piston. If you do not allow for this time, the seal may

tear or be cut when you place the worm into the rack.

(1) Slide compression tool (Appendix B, Section III, Item 83), small diameter end first, onto the worm

end of worm shaft/input shaft (1) until it is beyond the seal ring groove. Using seal installation tool

(Appendix B, Section III, Item 84), assemble the new worm shaft O-ring (55), and then the new

seal ring (54). Next, compress the seal ring. Allow the worm shaft/input shaft to set with

compression tool in place for at least ten minutes.

CAUTION

The bearing rolls must be in place to insure proper installation of

the bearing. If the rolls are improperly installed, the bearing

race may collapse and fail. The flange may break, causing

premature failure of the bearing. Again, do not mix the housing

bearing rolls with the side cover bearing rolls. Be sure the

bearing mandrel used is clean.

(2) If you are installing a new housing bearing (16) or using the old housing and bearing assembly,

apply a generous amount of clean grease to the bearing race to retain the bearing rolls. Then,

place the rolls into the race, being sure you have the correct quantity of rolls for your particular

bearing assembly. To install the NEW bearing assembly (1 6) into the housing, first install the

retaining ring (61) into the groove on the bearing's outside diameter. Then press the bearing into

the housing from the trunnion side using bearing mandrel (Appendix B, Section III, Item 88) against

the lettered end of the bearing shell that the retaining ring is away from the housing bore. During

this procedure be sure that the housing is square with press base and the bearing is not cocked.

5-224