WORK OPERATION 5
MHL380 D 5.9
5.1.9 Key switches (optional)
The machine can be equipped with two key
switches (133/84) and (133/85) as optional
extras.
5.1.9.1 Black key switch
Black key switch (133/84)
deactivate over-
load warning device/overload cut-off
The overload cut-off with warning function
sends an audible and visible alert whenever
the machine’s load approaches the permissi-
ble maximum load due to a load having been
taken up. When the permissible load is ex-
ceeded, the load-increasing work functions
(raise/lower boom and extend dipperstick) are
disabled. The overload warning and cut-off
functions can be completely deactivated using
the key switch (133/84)!
Danger of injury due to machine
toppling over
The cut-off function does not offer
complete protection against the
generation of critical load torques
that exceed the stability of the ma-
chine. Depending on the foundation
on which the machine is supported,
the dynamic forces during the
movement of large loads at high
speeds, and the resulting swinging
out of the grab and load, the ma-
chine may be overloaded beyond
its stability, even with overload cut-
off active!
In an emergency: Administer first
aid, seek treatment from a doctor
5.1.9.2 Blue key switch
Blue key switch (133/85)
reduce hydraulic
oil pressure or enable work movements with
the diesel engine stopped
As an option (for the Italian market, for exam-
ple), the machine may be equipped with a
device that prevents work movements being
carried out when the diesel engine is stopped.
When using this option, in order to lower the
load or reduce any oil pressure that may be
present in the hydraulic system when the die-
sel engine is stopped, the key switch (133/85)
must be set to position I by an authorized per-
son. The operator can then lower the load by
lowering the boom or retracting the dipper-
stick, or can reduce the oil pressure in the
hydraulic system by triggering another work
movement. In the case of machines which are
equipped with a dead man’s button in the left-
hand four-way control lever, the dead man’s
button must also be pressed.
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