Rev 26.0/4-13
14
MRT4-DC: #35070
Monitoring the Low Vacuum Warning Buzzer (if applicable)
If the lifter is equipped with a low vacuum warning buzzer, an alarm sounds until the lifter
attains sufficient vacuum to lift the maximum load weight (see SPECIFICATIONS: Load Capacity).
After the lifter has attained this vacuum level, the alarm stops sounding, to indicate that the lifter
is ready to lift the load.
WARNING: Never attempt to lift load while alarm is sounding.
Do not attempt to lift the load while the alarm is sounding; such an attempt could result in a load
release and possible injury to the operator.
If the vacuum system experiences leakage while the lifter is attached to the load, the vacuum
pump turns on automatically, as required to maintain sufficient vacuum. The alarm also sounds
while the pump is running, to signal the reduction in vacuum to the operator. If the alarm
sounds while you are lifting a load, make sure the vacuum gauge shows a vacuum level of 16"
Hg [-54 kPa] or higher. If not, immediately move away and stay clear of the load until it can be
lowered to the ground or a stable support.
WARNING: Stay clear of any suspended load while alarm is sounding.
Discontinue lifter use until the cause of the vacuum loss can be determined. Using the lifter on
contaminated, rough or porous surfaces may result in a vacuum loss, due to leakage between
the vacuum pads and the load. Since the alarm may sound in such circumstances, consult the
section T
O
A
PPLY THE
P
ADS TO A
L
OAD
: Vacuum Level on Other Surfaces to determine whether the
lifter can be used to lift the load. If the vacuum loss is due to any other cause, perform
inspection and maintenance as needed to identify and correct any deficiency before resuming
normal operation of the lifter.
Controlling the Lifter and Load
When the vacuum indicators show that the lifter is ready, use the hoisting equipment to raise the
lifter and load as needed to clear any obstacles in their path. Use the control handle to keep the
lifter and load in the desired orientation while they are suspended from the crane. Once
sufficient clearance is established, the load can be rotated or tilted as desired (see T
O
R
OTATE THE
L
OAD
E
DGEWISE
or T
O
T
ILT THE
L
OAD
to follow).
In Case of Power Failure
The lifter is equipped with a vacuum reserve tank, designed to maintain vacuum temporarily in
case of a power failure (ie, in battery).
WARNING: Stay clear of any suspended load in the event of a power failure.
Although the lifter is designed to support the load for at least 5 minutes without power, this
depends on many factors, including the condition of the load and the lifter’s vacuum system (see
INTENDED USE: L
OAD
C
HARACTERISTICS
and MAINTENANCE: V
ACUUM
P
AD
M
AINTENANCE
,
V
ACUUM
T
EST
). If a power failure occurs, keep all personnel clear of the suspended load until it can safely
be placed on the ground or a stable support. Correct any deficiency before resuming normal
operation of the lifter.
Summary of Contents for MRT411LDC
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