Wood’s Powr-Grip MRTA8HV11DC - Manual (Page 16)

Rev 10.0/9-13 14 MRTA8-DC: #35076
T
O
A
PPLY THE
P
ADS TO A
L
OAD
Powering up the Lifter
Make sure the lever on the vacuum control valve is in the center position (see T
O
R
ELEASE THE
P
ADS FROM THE
L
OAD
: About Energy Conservation Mode to follow). Place the power switch in the
ON ( ) position (blue indicator light remains illuminated while power is engaged). 6 The power
switch must remain in the ON position while operating the lifter. 7
WARNING: Never turn power off while operating lifter.
Placing the power switch in the OFF ( ) position during lifter operation could result in the
release of the load and possible injury to the operator (see T
O
L
IFT AND
M
OVE THE
L
OAD
: In Case of
Power Failure to follow).
Positioning the Lifter on the Load
Make certain that the contact surfaces of the load and all vacuum pads are free of any
contaminates that could prevent the pads from sealing against the load (see MAINTENANCE:
V
ACUUM
P
AD
M
AINTENANCE
).
Center the lifter’s pad frame to within 2" [5 cm] of the load center, since off-center loading can
cause the load to tilt or rotate unexpectedly (see T
O
L
IFT AND
M
OVE THE
L
OAD
: About the Tilt
Linkage and T
O
R
OTATE THE
L
OAD
E
DGEWISE
to follow), and it may also damage the lifter. 8 Make
sure that all vacuum pads will fit entirely on the load’s contact surface (see SPECIFICATIONS:
Pad Spread) and that they will be loaded evenly while lifting (see SPECIFICATIONS: Per-Pad Load
Capacity). Then position the lifter on the load so that all pads are touching the contact surface.
Sealing the Pads against the Load
Move the lever on the vacuum control valve to the “APPLY” position: Pull outward on the lever's
knob, move the lever all the way to the right and release it. This position opens the lifter’s
vacuum lines to the airflow created by the vacuum pumps, causing air to be drawn immediately
at the vacuum pads.
9 Apply the lifter to the load until all pads seal against it.
WARNING: Keep valve lever in “APPLY” position throughout lift.
The valve lever must remain in the “APPLY” position throughout the entire lift. Any interruption
of the vacuum flow during lifter operation could result in the release of the load and possible
injury to the operator.
6
After the power switch is placed in the ON position, the low vacuum warning light and the vacuum pumps turn on until the
lifter attains full vacuum. Since the lifter is operating in energy conservation mode at this stage, the pumps and warning light
may subsequently turn off. However, this does
not indicate that the lifter is ready to lift a load.
7
If a vacuum pump fails to function while the power switch is in the ON position, examine the circuit breaker (adjacent to power
switch) to determine whether it has interrupted the electrical circuit to the pump. Although the operator can reset the circuit
breaker, the power interruption may indicate an electrical problem that requires attention. Correct any deficiency before
resuming normal operation of the lifter (see wiring diagram provided).
8
The lifter is designed to handle the maximum load weight (see SPECIFICATIONS: Maximum Load Capacity) when the load’s
center of gravity is positioned within 2" [5 cm] of the pad frame’s center point. Occasional loading deviations are permissible,
provided that the operator can maintain control of the load at all times and that the load weight is low enough to avoid damaging
the lifter.
9
To conserve battery energy and reduce the time required to apply the pads to a load, do not place the valve lever in the
“APPLY” position unless the vacuum pads are contacting the load.