Snorkel TB47J - Manual (Page 31)

Chapter 7 – Prestart Inspection
TB47J – 0075182 27
Charging System
When the engine is running, the ammeter needle (refer to
Figure 7.6) should be to the right of “0.” Left of the “0” is
discharging.
Cold Weather Start Kit—Block Heater
If the machine engine is a Cummins or Ford that is
equipped with an optional engine block heater, visually
inspect the heater and power cord. Inspect for leaks
around the heater and for damage to the power cord.
Electrical System
Electrical power is supplied from either one or two, 600
CCA, 12 volt batteries. These batteries supply 12 volt DC
electrical power to operate the aerial platform electrical
and electrohydraulic components.
Machines with gasoline engines have one battery and
machines with diesel engines have two batteries.
A
Warning
Batteries give off hydrogen and oxygen that can
combine explosively. Death or serious injury can
result from a chemical explosion. Do not smoke or
permit open flames or sparks when checking the
batteries.
A
Caution
Even with low voltage electrical systems, severe
arcing can occur. Electrical shock or component
damage can result from contact with energized con-
ductors. Use caution when working with any elec-
trical device.
The batteries are behind the door on the left side of the
turntable.
Emergency Power Battery
The emergency power battery (refer to Figure 7.7) is be-
hind the door on the right side of the chassis. The battery
is automatically charged when the engine is running.
Figure 7.7 – Emergency Power Battery
Include the emergency power battery when inspecting
and servicing the electrical system.
Battery Fluid Level
Remove the caps from each battery (refer to Figure 7.7).
Visually check the battery fluid level. If the level is not
within 1 /
4
″ (6 mm) of the bottom of the filler neck inside
each hole, add distilled water.
Replace the caps on the batteries. The caps must be in
place and tight during machine operation.
Battery Terminals
Check the top of the batteries, the terminals, and cable
ends (refer to Figure 7.7). They should be clean and free
of corrosion. Clean the top of the batteries if necessary.
Clean the terminals and cable ends with a wire brush or
terminal cleaning tool. All cable ends must be securely
fastened to the terminals.
Cables and Wiring Harness
Inspect all cables and wiring for wear and/or physical
damage such as loose connections, broken wires, and
frayed insulation. Check the wiring in areas where a change
in routing direction may cause them to become pinched.
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.
A
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
Check the hydraulic reservoir fluid level with the aerial
platform stowed on a level surface. The fluid level must
be between the full and add marks as viewed on the sight
glass (refer to Figure 7.8).
Terminals
Caps