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Assembly-continued -706880902
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TM-5-4210-233-14-P-1 Firfighting Truck 100 Ft. Aerial Ladder 1000 GPM Manual
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Assembly-continued -706880904
TM 5-4210-233-14&P-1
5-39. STEERING GEAR-Continued
(36)
If the replacement Teflon washer (21) is not an integral part of the two-piece seal (20) and the
sector shaft (2) did not pass the "thumb nail test." assemble the steel backup washer (22) and then
the Teflon washer (21) into the side cover (15) bearing bore.
CAUTION
Be sure the two piece seal and the side cover bearing rolls
remain correctly assembled and that the vent plug (23) has been
removed during these procedures.
(37)
Assemble retaining ring (19) onto the side cover end of secor shaft (2). Assemble the two-piece
t
seal (20) onto the end of the sector shaft about 1 inch (25.4 mm). The words "oil side" on the seal
must face toward the sector shaft.
(38)
Be sure the side cover bearing, the sector shaft bearing diameter and seal are well greased, then
insert sector shaft (2) assembly into the side cover (1 5) bearing only until the shaft will retain the
loose side cover bearing rolls in place (about 8 turns of adjusting screw). Slowly and carefully work
the two piece seal (20) down the sector shaft and squarely into the side cover until it is past the
retaining ring groove. Then work the retaining ring (19) into the retaining ring groove. Carefully turn
the adjusting screw (8) through side cover until it reaches solid height then back screw one turn, so
that the side cover rotates freely on sector shaft.
WARNING
Do not weld or otherwise plug this hole in any permanent
manner. This is a safety vent which functions only if the side
cover seal fails. If the seal fails and the plug cannot vent, the
steering gear may lockup or otherwise malfunction.
(39)
Assemble the vent plug (23) into the hole provided on the side cover (15). Press the vent plug in
flush with the side cover.
(40)
Assemble the jam nut (7) onto the adjusting screw (8) a few threads.
(41)
Apply clean high temperature grease (Item 15, Appendix E) to the new side cover gasket (17), and
assemble it onto the side cover (15). There must be enough grease to hold the gasket in place.
CAUTION
If the rack piston is not centered when sector shaft is installed,
the gear travel will be severely limited in one direction of travel,
and significant internal damage to the steering gear can occur
when the gear is operated.
(42)
There are four teeth on the rack piston (46). Position the tooth space between the second and third
teeth in the center of the housing sector shaft cavity. This will center the rack piston in the cavity.
5-233

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