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Disassembly-continued -706880890
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TM-5-4210-233-14-P-1 Firfighting Truck 100 Ft. Aerial Ladder 1000 GPM Manual
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Cleaning and Inspection -706880892
TM 5-4210-233-14&P-1
5-39. STEERING GEAR-Continued
(32)
Remove the rack piston (46) worm shaft/input shaft (1) assem ly from the gear housing (18). Lay
b
the rack piston (46) worm shaft (1) assembly on a clean rag to keep the piston from rolling.
NOTE
The worm shaft part of the assembly will be inside the rack
piston, with the input shaft part of the worm protruding from the
rack piston. Take care when removing this assembly from the
housing. To prevent the teflon rack piston seal (47) from getting
caught in the sector shaft cavity, remove the worm shaft rack
piston assembly from the long end of the housing.
(33)
Bend the tangs down that are on the ball return guide clip (48). Remove the two hex head bolts
(50) and clip. Discard ball return guide clip.
CAUTION
Assembly contains a set of 34 matched balls, and you must take
special care not to loose any. If any balls are lost, a complete,
new set of matched balls will be required.
WARNING
Incorrect matching of balls, wormscrew and rack piston can
result in loss of steering, which could result in an accident.
(34)
Remove the two ball return guide halves (51). Remove the balls (52) from the rack piston (46) by
rotating the worm shaft/input shaft (1) until the 34 balls fall out.
NOTE
Ball return guides are closely fitted with the rack piston and you
may have to remove them by carefully inserting a screw driver
between the rack piston and the ball return guides.
(35)
Remove the worm shaft/input shaft (1) from the rack piston (46).
(36)
Remove and discard the rack piston seal ring (47).
(37)
Remove and discard the rack piston backup "O" ring (53) from the ra k piston.
c
WARNING
Do not disassemble the worm shaft/input shaft assembly (1),
which includes the worm shaft, input shaft, torsion bar, torsion
bar pins, drive ring and drive ring retainer, and insert. Do not
unbend the drive ring retainer tangs that hold the drive ring in
place.  Doing either will alter the valve timing, which could
cause the truck to pull to one side or the other.
5-221

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