Wood’s Powr-Grip FL4HV11AC - Manual (Page 15)

Rev 15.0/1-14 13 FL4HV11AC: #35030
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 lower 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 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.
WARNING: Never allow pads shutoff to be opened or closed while lifting.
Opening or closing the pads shutoff while the lifter is supporting a load could result in a load
release and possible injury to the operator or others. The operator must take all appropriate
measures to prevent any person or object from accidentally moving the lever of the pads shutoff
during the lift.
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.
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.