Wood’s Powr-Grip MRTA611LDC - Manual (Page 19)

Rev 14.0/5-13 17 MRTA6-DC: #35072
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 2 vacuum reserve tanks, 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.
T
O
R
OTATE THE
L
OAD
E
DGEWISE
WARNING: Make sure load is positioned correctly on lifter (see T
O
A
PPLY
);
unbalanced loads may rotate unexpectedly when latch is
disengaged.
Remember that the load is longer in its diagonal dimensions than in its side
dimensions. Make sure there is sufficient clearance for the load to rotate
without contacting the operator or any nearby objects. Maintain a firm grip
on the control handle to keep the load under control at all times. Pull the
rotation release lever to disengage the rotation latch, and rotate the load to
the desired position. 11 To stop the load’s motion automatically at each
quarter turn, simply let go of the rotation release lever immediately before
the end of the turn, so that the rotation latch engages at the next stop.
Whenever rotation is not required, keep the rotation latch engaged, to
prevent accidental damage to the load and possible injury to the operator.
11
If the load's center of gravity is not centered on the pad frame, it may be necessary to relieve pressure on the rotation latch
by applying force to the pad frame in the appropriate direction of rotation.