Snorkel TB42, Operator'S Manual

Page: 21 / 68

Chapter 4 – Safety Devices
TB42/TB50 – 0075251EE 17
Figure 4.8 – Lower Control Panel
To eliminate repeated tripping of the system during ma-
chine operation, there is a five second delay in machine
functions following:
• starting the engine.
• placing the drive/boom selector switch in the boom
position when the main boom is below horizontal and
fully retracted.
• removing excess load from the platform.
Engine Protection Systems
A constant tone alarm will sound to warn against high
engine temperature or low oil pressure.
The engine will shut-down if the operating temperature
exceeds a preset level or if the oil pressure is too low for
safe operation. An engine temperature gauge is on the
lower control panel (refer to Figure 4.8).
High Engine Temperature Alarm
If the coolant in a Cummins engine exceeds the engine
operating temperature an alarm will sound and the en-
gine will shut off.
If the oil in a Deutz engine exceeds 110°C (230°F) an
alarm will sound and the engine will shut off. Any time
there is no alternator current being produced, an alarm
will sound and the engine will shut off. This prevents high
engine temperature if the fan belt breaks.
Do not restart the engine until the condition that caused
the overheating has been corrected.
Platform Overload Sensing System
All functions are stopped from the upper and lower con-
trols, when the platform overload limit is exceeded. The
horn will sound intermittently and the red overload light
(refer to Figure 4.7) will blink until the excess load is
removed from the platform. At that time, the machine func-
tions are again operational.
Note
If the platform overload sensing system is tripped while
operating the machine, the emergency power system may
still be used for emergency machine operation from ei-
ther the lower or upper controls.
Figure 4.7 – Upper Controls
If the platform becomes significantly overloaded, or if an
upward force on the platform exceeds approximately
445 N (100 lb), the system will enter into error mode,
stopping all functions from the upper and lower controls.
The horn will then sound constantly and the overload light
will stay illuminated at the upper and lower controls (refer
to Figure 4.7 and 4.8).
The system will remain in error mode until the excess
load is removed from the platform and the emergency
stop button or start switch is cycled off and back on,
resetting the system. At that time, the machine func-
tions are operational.
A
Danger
The aerial platform can tip over if it becomes un-
stable. Death or serious injury will result from a tip-
over accident. Do not exceed the capacity values
indicated on the platform rating placard.
The overload sensing system is not active when the ma-
chine is being driven with the booms in the stowed posi-
tion. This allows the machine to be driven without the
system sensing an overload due to rough ground condi-
tions.
Platform
Overload Light
Engine
Temperature
Gauge
Platform
Overload Light