Snorkel TB50 - Manual (Page 38)

Chapter 7 – Prestart Inspection
34 TB42/TB50 – 0074923
Electrical System
Electrical power is supplied from either one or two, 550
CCA, 12 volt batteries (refer to figure 7.8). These bat-
teries supply 12 volt DC electrical power to operate the
aerial platform electrical and electrohydraulic compo-
nents, including the emergency power system.
Figure 7.8 – Batteries
Machines with gasoline engines have one battery and
machines with diesel engines have two batteries. The
batteries are behind the door on the left side of the
turntable.
Warning
Batteries give off hydrogen and oxygen that can
combine explosively. Death or serious injury could
result from a chemical explosion. Do not smoke or
permit open flames or sparks when checking the
batteries.
Caution
Even with low voltage electrical systems, severe
arcing can occur. Electrical shock or component
damage may result from contact with energized
conductors. Use caution when working with any
electrical device.
The batteries are automatically charged when the en-
gine is running. Include batteries when inspecting and
servicing the electrical system.
For optimal battery performance the battery fluid level
must be maintained and the battery connections must
be kept clean.
Battery Fluid Level
To inspect the battery fluid level:
1. Remove the caps from the battery (refer to Figure
7.8).
2. Visually check the battery fluid level making sure the
level is within ¼″ (6 mm) of the bottom of the filler
neck inside each hole.
3. If necessary, add distilled water.
Note
Use only distilled water when refilling the battery. Tap
water may contain metallic solids such as iron which
can reduce the life of the battery.
4. Replace the caps on the battery. The caps must be
in place and tight during machine operation.
Battery Terminals
To inspect the battery terminals:
1. Check the top of the battery, the terminals, and cable
ends (refer to Figure 7.8). They should be clean and
free of corrosion.
2. If necessary, clean the top of the battery. Clean
the terminals and cable ends with a wire brush or
terminal cleaning tool.
3. Make sure all cable ends are securely fastened to
the terminals.
Cables and Wiring Harness
To inspect the cables and wiring harness:
1. Visually inspect all cables and wiring for wear and/or
physical damage such as loose connections, broken
wires, and frayed insulation.
2. Check the wiring in areas where a change in routing
direction may cause them to become pinched.
3. Make sure the cables and wires are properly routed
to avoid sharp edges, pinching, and scuffing.
Hydraulic System
Hydraulic power is supplied from an engine driven vari-
able displacement piston pump.
Danger
Hydraulic fluid escaping under pressure can have
enough force to inject fluid into the flesh. Serious
infection or reaction will result if medical treatment
is not given immediately. In case of injury by escap-
ing hydraulic fluid, seek medical attention at once.
The hydraulic reservoir is behind the door on the left side
of the turntable. The pump is mounted on the engine.
Fluid Level
To inspect the fluid level:
1. Place the aerial platform on a level surface with the
platform fully stowed.
Caps
Terminals