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Assembly-continued -706880898
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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 -706880900
TM 5-4210-233-14&P-1
5-39. STEERING GEAR-Continued
(16)
Position the end cover (31) so that the poppet adjusting screw (28) is aligned with the end of the
poppet (58).
(17)
Install the four end cover bolts (29), 1.625 in. (41 mm) long, and washers (30), and torque the bolts
to 150-170 ft. Ibs. (203-230 NĚ ) if dry, or 108-128 ft. Ibs. (146-174 NĚ ) if lubricated.
m
m
(18)
Grease the two new backup O-rings (45) and the two new Teflon seal rings (44). Using seal
installation tool, assemble the backup O-rings and then the Teflon seal rings onto the valve
sleeve (37).
NOTE
Assemble each O-ring and seal ring from the end closest to its
groove.
CAUTION
A minimum of ten minutes with the compression tool in place is
required to ensure that the seal rings are properly seated.
Otherwise, the valve sleeve will be difficult to assemble into the
valve housing, and the seal rings may be damaged during
installation.
(19)
Use compression tool (Appendix B, Section III, Item 83) to compress the Teflon seal rings. Leave
the compression tool on for 10 minutes.
(20)
Assemble the poppet valve adjusting screw (34) and nut (27) assembly into the valve housing (35)
4 or 5 turns.
(21)
Apply clean grease to the valve housing (35) seal ring groove. Install a new valve housing seal ring
(32) into valve housing seal ring groove.
NOTE
When installed, the valve housing seal ring should extend
slightly above the machined surface of the valve housing.
(22)
Apply a generous amount of clean grease to one thrust washer (38). Install the thrust washer into
the valve housing (35), making sure to center the washer.
WARNING
The thrust washer and thrust bearing must be flat and centered
in the counterbore surface, otherwise, the thrust washer could
break when you assemble the valve housing into the gear
housing (18). A broken washer could cause uncontrollable
steering, possibly resulting in an accident.
(23)
Apply a generous amount of clean grease to the thrust bearing (39). Install the thrust bearing into
the valve housing (onto the thrust washer), making sure to center the bearing on the washer.
5-229

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