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Ift and, Ove the, Load capacity and the vacuum gauge – Wood’s Powr-Grip MT5HV11AC User Manual

Page 14: Monitoring the vacuum gauge, Controlling the lifter and load, In case of power failure

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Rev 19.0/1-14

12

MT5HV11AC: #35086

T

O

L

IFT AND

M

OVE THE

L

OAD

Load Capacity and the Vacuum Gauge

When vacuum registers higher than 17½" Hg [-59 kPa] on the vacuum gauge, the lifter is ready

to lift the maximum load weight.

WARNING: Never attempt to lift load unless vacuum level registers higher than

17½" Hg [-59 kPa].

Do not attempt to lift the load while vacuum registers lower than 17½" Hg [-59 kPa]; such an

attempt could result in a load release and possible injury to the operator.

Monitoring the Vacuum Gauge

The vacuum gauge must remain completely visible to the operator, so that it can be monitored

throughout the entire lift.

WARNING: Vacuum gauge 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 vacuum gauge signals the reduction in vacuum to the operator. Make sure the
vacuum gauge shows a vacuum level of 17½" Hg [-59 kPa] or higher while you are lifting a load.

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

17½" Hg [-59 kPa].

Discontinue lifter use until the cause of the vacuum loss can be determined. If the vacuum level

remains lower than 17½" Hg [-59 kPa] 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 gauge shows 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 tilted as desired (see T

O

T

ILT THE

L

OAD

to follow).

In Case of 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.