Envelope Restriction; Engine Protection Systems; High Engine Temperature Alarm; Low Oil Pressure Alarm - Snorkel TB42J Operato's Manual

The tilt alarm is for added protection and does not justify
operating on anything other than firm, flat, level surfaces.

Envelope Restriction

Boom movement is restricted in some areas of the work-
ing envelope to ensure the design limits of the machine
are not exceeded. A white light (refer to Figure 4.7) will
illuminate when boom movement is being restricted.
Envelope Restriction Light
Figure 4.7 – Upper Controls
When extending the tip boom, if the main boom angle is
too low, the tip boom will not fully extend and the enve-
lope restriction light will illuminate. The light will stay on
until the main boom is raised enough to allow for farther
boom extension.
When lowering the main boom, if the tip boom is ex-
tended too far, the main boom will not lower and the enve-
lope restriction light will illuminate. The light will stay on
until the tip boom is retracted enough to allow for farther
boom lowering.

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 below
the lower control panel (refer to Figure 4.8).
TB42J – 0172310
Temperature
Gauge
Figure 4.8 – Engine Gauges

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 230°F (110°C) 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.

Low Oil Pressure Alarm

The low oil pressure alarm sounds when the engine oil
pressure is near the lower limit for safe engine operation.
If the alarm sounds, lower the platform to the ground and
then turn the engine off. Do not restart the engine until
the condition that caused the low oil pressure has been
corrected.
If the engine oil pressure falls below a safe operating value
the engine will shut off. The engine can be restarted with
low oil pressure, but it will only run a few seconds before
it shuts off again.

Horn

The optional horn may be used to warn personnel on the
ground. The horn button is on the right side of the upper
control panel. The horn is operational when the machine
is set up for operation from the upper controls.

Drive Motion Alarm

An optional drive motion alarm may be provided on the
machine. When the drive/steer control is moved out of
neutral the alarm sounds, in short beeps, to warn per-
sonnel in the work area to stand clear.
Chapter 4 – Safety Devices
15