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Assembly-continued -706880897
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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 -706880899
TM 5-4210-233-14&P-1
5-39. STEERING GEAR-Continued
NOTE
To ease the later assembly of the sector shaft (2),
rotate the rack piston worm shaft assembly in the
housing so that the rack piston teeth are exposed in
the sector shaft cavity of the housing.
(12)
If disassembled, assemble a new worm shaft input shaft adjusting screw sealing nut (25) onto the
solid (nonslotted) end of the worm shaft preload adjusting screw (26), so that the seal on the
sealing nut will face the end cover (31). Assemble one N W poppet valve adjusting screw sealing
E
nut (27) onto the poppet valve adjusting screw (28) and assemble the other NEW poppet valve
adjusting screw sealing nut (27) onto the other poppet valve adjusting screw (34) in the same
manner as described for parts (25) and (26).
CAUTION
If the screws are of unequal length, you must install the shorter
screw into end cover. Otherwise, the poppet assembly may
break and cause the steering gear to lockup.
(13)
Assemble poppet adjusting screw (28) and nut (2 ) assembly into end cover (31) a few turns.
7
NOTE
The poppet valve adjusting screws may or may not be of the
same length. If not the same length, assemble the shorter
adjusting screw (28), 2.25 in. (57 mm) long, into the end cover
(31).
(14)
Assemble the worm shaft preload adjusting screw (26) and nut (25) assembly into the end cover
(31) a few turns.
(15)
Apply clean grease to the end cover seal ring groove on the end cover (31). Install the new end
cover seal ring (32) into the end cover seal ring groove.
NOTE
When installed, the end cover seal ring should extend slightly
above the machined surface of the end cover.
CAUTION
When performing step (1 6), make sure that the rack piston (46)
teeth are fully visible in the sector shaft cavity of the housing.
This is necessary to insure proper location of the poppets, and to
insure that the poppet adjusting screw will contact the poppets.
5-228

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