WPG P110C04DC, Operating Instructions Manual

Page: 16 / 36

P1-DC: #35111 Rev 29.0/11-19 14
Sealing the Pads 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 pads seal. This is normal.
Press the lifter firmly against the load to help the pads 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 pads have 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 SERVICE MANUAL ).
• When necessary, perform the “Vacuum Test” on page 23.
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 “SPECIFICATIONS” on page 3), it may not be able to maintain sufficient vacuum
for lifting. Contact WPG for more information.
OPERATION