Wood’s Powr-Grip MRTA611LDC - Manual (Page 18)

Rev 14.0/5-13 16 MRTA6-DC: #35072
Monitoring Vacuum Indicators
The low vacuum warning light and both vacuum gauges 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.
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 for lifting the maximum
load weight. The low vacuum warning light also turns on and remains illuminated while the
pump is running, to signal the reduction in vacuum to the operator.
If the pump and warning light turn on while you are lifting a load, make sure both vacuum
gauges show 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 pump runs at
intervals of ten minutes or less while 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.
Low Vacuum Warning Buzzer
Using the low vacuum warning buzzer requires minimal interaction from the operator. The
warning buzzer sounds an alarm 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.