Wood’s Powr-Grip MT10HV11FDCO - Manual (Page 12)

Rev 19.0/1-13 10 MT-HV11FDCO: #35093
Sealing the Pads against the Load
Turn the apply/release switch on the movable control pendant to the “APPLY” position
(clockwise) to energize the vacuum pumps. Then apply the lifter to the load so that all activated
pads are touching the contact surface. Move the slide on the pad frame control valve to the
“APPLY” position, 7 and press the lifter onto the load until the pads seal against the contact
surface. Both the apply/release switch and the pad frame control valve must remain in the
“APPLY” position throughout the entire lift.
WARNING: Keep apply/release switch and pad frame control valve 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
activated pad that has not yet sealed.
Vacuum Level on Optimal Surfaces
When the lifter is attached to clean, smooth, nonporous load surfaces, it should be able to
maintain a vacuum level in the green range on the vacuum gauge, except when used at high
elevations (see SPECIFICATIONS: Operating Elevation). If not, make sure the vacuum switch is
adjusted correctly (see MAINTENANCE: V
ACUUM S WITCH A DJUSTMENT ). If the vacuum switch
cannot be adjusted to maintain a vacuum of 16" Hg [-54 kPa], perform the V
ACUUM
T
EST
(see
MAINTENANCE) to determine whether there is a deficiency in the vacuum generating system.
Vacuum Level on Other Surfaces
When the lifter is attached to contaminated, rough or porous load surfaces, it may not be able to
maintain a vacuum level in the green range on the vacuum gauge, due to leakage in the seal
between the vacuum pads and the load surface.
8 In the case of contamination, thoroughly clean
the contact surfaces of the load and the vacuum pads (see MAINTENANCE: V
ACUUM
P
AD
M
AINTENANCE
: Cleaning), and reapply the lifter to the load. If the load has rough or porous
surfaces, the operator must conduct a test to determine whether the lifter is designed
to lift the load , as follows:
1) Make sure the lifter's vacuum generating system is functioning correctly (see MAINTENANCE:
V
ACUUM
T
EST
).
2) Apply the vacuum pads to the load as previously directed.
7
To conserve battery energy and reduce the time required to apply the pads to a load, do not place the apply/release switch
and the pad frame control valve in the “APPLY” position at the same time unless the vacuum pads are contacting the load.
8
Contaminated loads can also cause the vacuum pumps to run frequently or continuously. Since excessive pumping quickly
reduces battery energy, the operator should clean the load when possible, to minimize pumping.