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Assembly-continued -706880899
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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 -706880901
TM 5-4210-233-14&P-1
5-39. STEERING GEAR-Continued
WARNING
The thrust washer must be securely in place on the
valve sleeve. If ft is not, it can break and cause
uncontrollable steering, possibly resulting in an
accident.
(24)
When the 1 minute compression time has elapsed, remove the compression tool from the valve
sleeve (37). Apply more grease to the valve sleeve seals, and grease the thrust washer face on the
end of the valve sleeve without the drive slots. Place the other thrust wash r (38) onto the valve
e
sleeve end without the drive slots.
WARNING
Do not force valve sleeve down into the valve housing. Make
sure valve sleeve seal rings are compressed. In- correct
assembly or incorrect measurement may cause the thrust
washers or thrust bearing to break during gear operation, which
will result in uncontrollable steering.
(25)
Assemble the valve sleeve (37) with attached thrust washer down, into the valve housing (35).
When the valve sleeve is in place, it should measure between.370 and .400 inches (9.40-10.16
mm) above the face of the valve housing to the end of the valve sleeve nose.
WARNING
Worm shaft and valve sleeve units are assembled and supplied
as matched sets. Use only prematched sets for replacements.
Never mate an old sleeve with a new worm or an old worm with
a new sleeve. To do so may damage the gear or injure the
driver or do both during operation.
(26)
Position the rack piston (46) so that it is flush with the open end of the gear housing (1 8). Rotate
the worm shaft (1) until it extends out of the rack piston as far as it will go.
WARNING
If you place an incorrect valve sleeve on a worm and assemble
this into the gear, the gear will not function properly. Instead, the
mechanism will jerk the steering wheel with such force that it
could injure the driver.
(27)
Locate the timing mark on the valve sleeve (37), a faint, punched mark on the chamfered edge of
the valve sleeve or an indented mark on the front face of the sleeve. Locate the scribed timing
mark on the worm shaft (1). Next, grasp the valve housing (35) face and your fingers apply
pressure to keep the valve sleeve in the valve housing. Align the previously located timing marks
and place the valve housing/valve sleeve assembly onto the input shaft end of the worm shaft/input
shaft (1) until the drive lugs are fully engaged in the valve sleeve slots.
5-230

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