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Cleaning and Inspection-continued -706880893
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TM-5-4210-233-14-P-1 Firfighting Truck 100 Ft. Aerial Ladder 1000 GPM Manual
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STEERING GEAR-continued -706880895
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.
c.
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

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