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Using Emergency Hydraulic Pump -706880089
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TM-5-4210-233-14-P-1 Firfighting Truck 100 Ft. Aerial Ladder 1000 GPM Manual
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OPERATING THE AUXILIARY POWER UNIT (APU)
TM 5-4210-233-14&P-1
2-15. EMERGENCY AERIAL PROCEDURES - Continued
c. Rotating Ladder Turntable.
WARNING
The ladder must be secured to prevent
rotation of turntable in either direction
before the hydraulic motor and brake
assembly are removed. This prevents the
ladder from rotating out of control when
brake is removed. The guy ropes should be
placed on the lower chords of the ladder
sections.
(1)
Secure ladder with guy ropes to prevent turntable
rotation when brake is removed.
(2)
Remove the hydraulic motor and brake assembly
from planetary drive.
(3)
Use the hand crank provided (located under the
ladder control panel) to align ladder with bed locks.
NOTE
Be sure to position ladder in line with bed
locks; ladder cannot conveniently be lifted
manually.
d.
Lowering Ladder.
(1)
Turn the black knob on the hydraulic hoist manifold
block, located under the step at the base of the
aerial ladder. Turn the knob counterclockwise.
This will slowly lower the ladder.
(2)
To stop lowering the ladder, tighten the black knob.
e.
Raising Outriggers.
(1)
Remove cover on each jack stand. Loosen the two
bolts slowly and evenly, one revolution at a time.
This breaks the seal on the cylinder inlet and allows
oil to be released.
(2)
The outriggers can now be lifted manually.
(3)
Tighten the two bolts. This will keep the outriggers
raised after a vacuum forms in the cylinders.
NOTE
The outriggers can be manually retracted by engaging the
hydraulic valve and pushing in the corresponding outrigger
beam.
2-62

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