Wood’s Powr-Grip MRTA8-AIR - Manual (Page 16)

Rev 6.0/12-12 14 MRTA8-AC: #35074
Load Capacity and the Lift Light
A lifter's Load Capacity is rated at a vacuum level of 16" Hg [-54 kPa] (see SPECIFICATIONS).
After the lifter has attained this level, the green vacuum lift light turns on to indicate that the
lifter is ready to lift the maximum load weight.
WARNING: Never attempt to lift load unless green lift light is illuminated.
Do not attempt to lift the load unless the lift light is illuminated and the lever on the vacuum
control valve is in the “APPLY” position (see T
O
R
ELEASE THE
P
ADS FROM THE
L
OAD
: About Stand-By
Mode to follow); such an attempt could result in a load release and possible injury to the
operator.
Monitoring Vacuum Indicators
The vacuum lift light and the vacuum gauge must remain completely visible to the operator, so
that they can be monitored throughout the entire lift.
WARNING: Vacuum indicators must be visible to operator throughout entire lift.
The lifter’s vacuum pump runs continuously to maintain sufficient vacuum for lifting the
maximum load weight. If the vacuum system experiences leakage while the lifter is attached to
the load, the lift light turns off automatically, to signal the reduction in vacuum to the operator.
If the lift light turns off while you are lifting a load, make sure the vacuum gauge shows a
vacuum level of 16" Hg [-54 kPa] or higher. If not, 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 vacuum level is less than 16"
Hg [-54 kPa].
Discontinue lifter use until the cause of the vacuum loss can be determined. If the lift light does
not turn on when the lifter is attached to clean, smooth, nonporous materials, the leakage is
likely to be in the vacuum system. In this event, perform the V
ACUUM
T
EST
(see MAINTENANCE)
and inspect the vacuum pads for damage (see MAINTENANCE: V
ACUUM
P
AD
M
AINTENANCE
:
Inspection). If the vacuum loss cannot be remedied immediately, 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 handles 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 tilted or rotated as desired (see T
O
T
ILT THE
L
OAD
and T
O
R
OTATE THE
L
OAD
E
DGEWISE
to follow).