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STEERING GEAR-continued -706880895
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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 -706880897
TM 5-4210-233-14&P-1
5-39. STEERING GEAR-Continued
NOTE
Bearing BR-970 requires 41 rolls, and Bearing BR-970-1
requires 42 rolls.
The bearing assembly (16) may be of caging (retained) roll
type therefore not requiring reassembly of the rolls.
(3) Install the new rack piston backup O-ring (53) and the new Teflon rack piston seal ring (47) into the
rack piston (46) ring groove. Do not over stretch the rings as you install them. Coat with a liberal
amount of grease.
WARNING
During step (4), you should wear eye protection, as the spring
loaded poppets could eject, and cause eye injury.
(4) If the poppets were removed, position rack piston (46) in a soft jawed vise and install one poppet
seat (57). From the other end of the rack piston install one poppet (58), the spring (60), the nylon
spacer rod (59), the other poppet (58), and the other poppet seat (57). Torque both poppet seats to
20-25 ft. lbs. (27-34 Nm). Install both retaining rings (56).
(5) When the 10 minute compression time has elapsed, remove the compression tool from the worm
shaft/input shaft assembly (1). Grease the worm shaft seal ring and the sealing surface inside the
rack piston (46). Install the worm shaft/input shaft assembly into the rack piston end that will
position the worm seal ring in the rack bore and the worm ball track grooves to accept the set of
balls through the rack piston ball guide holes.
NOTE
If your ball return guides do not have a hole in the top for
loading balls, then proceed to step (8). If your ball return guides
do have a hole in the top, then follow steps (6 & 7).
WARNING
Do not seat guides with a hammer.  Damage to guides can
result in subsequent lock-up or loss of steering, which could
cause an accident.
(6) Assemble the ball return guides (51) into the rack piston (46). Make sure that the ball return guides
are seated.
WARNING
Make sure the ball return guides stay down in place while you
assemble the balls. Failure to hold the guides down may result
in a ball being trapped outside the closed loop. A trapped ball
can result in a steering lockup, which could cause an accident.
5-226

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