FL1-DC: #35026
Rev 6.0/11-20
14
Sealing the Pad on the Load
1A
Pull the valve handle outward
until it latches
(circled
in fig. 1A) in the “attach” position (
).
Keep valve handle in “attach” position
throughout lift.
The vacuum pump will turn on, the low vacuum
warning light will remain lit and the low vacuum warning buzzer, if present, will sound until the
vacuum pad seals. This is normal.
Press the lifter firmly against the load to help the pad begin to seal.
1
Reading the Vacuum Gauge
A vacuum gauge shows the current vacuum level in positive inches of Hg and negative kPa:
•
1B
1C
Green
range (>16" Hg [-54 kPa]):
Vacuum level is sufficient to lift the
maximum load weight (fig. 1B).
•
Red
range (<16" Hg [-54 kPa]):
Vacuum level is
not
sufficient to lift
the maximum load weight (fig. 1C).
If it takes more than 5 seconds for the
vacuum level to reach 5" Hg [-17 kPa], press
on any vacuum pad that has not yet sealed.
Once the pad has sealed, the lifter should be able to maintain sufficient vacuum for lifting,
except when used above the maximum Operating Elevation.
2
If it does not:
• Make sure the vacuum switch is adjusted correctly (see
.
1..... Although a vacuum pad may become distorted during shipping or storage, this condition should correct itself with continued use.
2.....
If the lifter is used above the maximum Operating Elevation (see
), it may not be able to maintain sufficient vacuum
for lifting. Contact WPG for more information.
OPERATION
