Snorkel TB42J, Operato'S Manual

Page: 34 / 68

Chapter 7 – Prestart Inspection
30 TB42J – 0172310
A
Warning
The potential for an accident increases when safety
devices do not function properly. Death or serious
injury can result from such accidents. Fully close
the emergency lowering knob before operating the
aerial platform.
4. Turn the knob to close the cylinder bleed down valve.
Level Sensor
Use the following procedure to test the level sensor.
1. Position the aerial platform on a smooth, flat, level
surface.
2. Remove all persons and materials from the platform.
3. Start the engine and raise the main boom about 8
′
(2.4 m) so the boom switch arm on the right side of
the turntable no longer contacts the boom (refer to
Figure 7.14).
Figure 7.14 – Boom Switch
4. Open the rear door on the left side of the machine to
access the level sensor (refer to Figure 7.15).
Figure 7.15 – Level Sensor
5. Pull the level sensor to the side as far as possible to
activate the tilt alarm.
A
Warning
The potential for an accident increases when safety
devices do not function properly. Death or serious
injury can result from such accidents. Do not alter,
disable, or override any safety device.
6. If the alarm does not sound, remove the machine
from service until the problem is corrected.
7. Lower the main boom.
Flashing Light
If the machine is equipped with an optional flashing light,
visually check to see that it flashes. The light should
flash when the engine is running.
Sandblast Protection Kit
The optional sandblast protection kit protects the cylin-
ders from abrasion while sandblasting or from paint
overspray. Rubber covers protect each cylinder rod as it
extends and retracts. The covers prevent sand and paint
from damaging the cylinder seals and rod.
Inspect the covers while operating the machine to ensure
they are securely fastened and completely cover the cyl-
inder rod. Make sure there are no holes in the covers.
Structures
Visually inspect all weldments and related components.
It is important to inspect the fasteners that connect the
components.
Weldments
Visually inspect all weldments for abnormal wear, abra-
sion, or deformation that could cause interference be-
tween moving parts.
Inspect the welds on the structural components. Pay
particular attention to boom welds. The area to be in-
spected should be clean and free of dirt and grease. Look
for visible cracks in the weld and at the weld to parent
material joint. A bright light may be used to provide ad-
equate visibility of the inspection area.
Slide Pads
The main boom has slide pads (refer to Figure 7.16) be-
tween the main and tip boom sections.
Switch Arm
Main Boom
Level Sensor