Rev 26.0/4-13
11
MRT4-DC: #35070
In order to be considered clearly audible,
the alarm volume must exceed ambient noise by
at least 15 dBA at the operator position.
4
Since the Maximum Alarm Volume is 103 dBA,
ambient noise must not exceed 88 dBA under any circumstances. Furthermore, if ambient noise
measures 88 dBA, the alarm volume must be set to maximum and the operator must remain
within 2 ft [60 cm] of the warning buzzer, in order for it to be effective.
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
).
Center the lifter’s rotation axis to within 2" [5 cm] of the load center, since off-center loading can
cause the load to rotate or tilt unexpectedly (see T
O
R
OTATE THE
L
OAD
E
DGEWISE
or T
O
T
ILT THE
L
OAD
to follow), and it may also damage the lifter.
5
Make sure that all vacuum pads will fit entirely on
the load’s contact surface (see SPECIFICATIONS: Maximum 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 until it latches securely in the
“APPLY” position (power on), as shown.
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 latched securely 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.
4
Consult CE Standard EN 457 for alternative ways to determine whether the alarm is clearly audible to operators.
5
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 lifter’s rotation axis. 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.
Summary of Contents for MRT411LDC
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