Wood’s Powr-Grip VL411LDC - Manual (Page 10)

Rev 17.0/12-12 8 VL411LDC: #35162
T
O
A
PPLY THE
P
ADS TO A
L
OAD
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
).
The lifter must be attached only to vertically oriented loads. Center the pad frame from left to
right on the load, and position the uppermost pads near the top edge. This position maximizes
stability while lifting the load. 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 apply the lifter to the load so that
all pads are touching the contact surface.
Sealing the Pads against the Load
Firm pressure at the center of the lifter helps the
vacuum pads begin to seal against the load. Pull the
valve handle outward to the “APPLY” position (power
on). This energizes the vacuum pump, causing
air to
be drawn at the pads immediately. The red low
vacuum warning light also turns on and remains
illuminated until the lifter attains sufficient vacuum to lift the
maximum load weight (see T
O
L
IFT AND
M
OVE THE
L
OAD
: Load Capacity and the Warning Light to
follow). The valve handle must remain in the “APPLY” position throughout the entire lift.
WARNING: Keep valve handle in “APPLY” position throughout lift.
Note: If a vacuum pad has been lying against a hard object (as during shipping), it may be
slightly distorted. Although initially it may be difficult to apply the pad to a load, this condition
should correct itself with continued use.
Reading the Vacuum Gauge
The vacuum gauge indicates the current vacuum level in the lifter’s vacuum system. The green
range indicates vacuum levels sufficient for lifting the maximum load weight, whereas the red
range indicates vacuum levels that are not sufficient for lifting the maximum load weight. The
gauge needle should show a sudden surge in vacuum as the vacuum pads seal against the load.
If it takes more than 5 seconds for the vacuum level to reach 5" Hg [-17 kPa], press on any pad
that has not yet sealed.
TO APPLY