Specifications – Wood’s Powr-Grip MRTA8-AIR User Manual
Page 3
Rev 6.0/12-12
1
MRTA8-AC: #35074
SPECIFICATIONS
Description:
Designed for use with a crane or other hoisting equipment, the MRTA8-AC lifters employ vacuum
to hold a load for lifting, and they provide manual 360° rotation and mechanically assisted, manual
90° tilt movements for load manipulation.
Model Number:
MRTA8HV11AC
MRTA811LAC
Vacuum Pads:
10" [25 cm] nom. diameter, lipped
(Model HV11)
1
11" [28 cm] nom. diameter, lipped
(Model G3370)
(Eight, standard rubber, spring-mounted for ¼" [7 mm] travel, with #60 filter screen)
Pad Spread:
2
(to outer edges)
Length - Maximum:
122 1/4" [3105 mm]
123 1/4" [3130 mm]
- Minimum:
50" [1270 mm]
51" [1295 mm]
Width - Maximum:
73 1/2" [1867 mm]
74 1/2" [1892 mm]
- Minimum:
12 3/4" [327 mm]
13 3/4" [352 mm]
Lifter Weight:
293 lbs [133 kg]
290 lbs [132 kg]
Maximum Load Capacity:
(rated at 16" Hg [-54 kPa] on clean, smooth, nonporous flat surfaces
3
)
Per-Pad:
150 lbs [68.5 kg]
175 lbs [79.5 kg]
Maximum:
1200 lbs [545 kg]
1400 lbs [635 kg]
Power Source:
120 volts AC, 50/60 hertz, 5 amps
Tilt Capability:
Manual, 90°, with four-bar tilt linkage that minimizes operator effort and automatically holds a
correctly attached load in the upright or flat position.
Rotation Capability:
Manual, 360°, with automatic latching (when desired).
Vacuum Pump:
Rotary vane type, 4 SCFM [113 liters/minute] nominal airflow
or
Diaphragm type, 3 SCFM [85 liters/minute] nominal airflow
Vacuum Reserve Tank:
Vacuum reservoir helps prevent immediate vacuum loss in case of power failure.
Vacuum Gauge:
Dial gauge indicates current vacuum level in positive inches of Hg and negative kPa.
Vacuum Lift Light:
Green light is energized whenever vacuum level is sufficient for lifting maximum load weight (higher
than 16" [-54 kPa]).
Options:
Available with Model LB8TLO - Tilt Lock. When engaged, this option ensures that the upright or
flat orientation of the load is not compromised by accidental or unexpected forces. See separate
instructions about other options.
Operating Elevation:
Maximum = 10,000 feet [3048 meters]
Operating Temperatures: 32° to 100° F [0° to 38° C]
Service Life:
This lifter is designed to have a service life of at least 20,000 lifting cycles, when used and
maintained as intended. Vacuum pads, filter elements and other wear-out items are excluded; see
MAINTENANCE and REPLACEMENT PARTS LIST for more information. For the D
ISPOSAL OF THE
L
IFTER
after its service life, see INTENDED USE.
ASME Standard BTH-1:
Design Category "B", Service Class "0" (see www.powrgrip.com for more information)
Wiring Diagram:
The following wiring diagrams are attached for reference in servicing the lifter or trouble-shooting
a deficiency:
!!-CE-!! Note: This symbol appears in the
INSTRUCTIONS manual only when requirements of a CE Standard are different from
requirements of other standards that also apply to this vacuum lifter. CE requirements are mandatory in geographical areas
where CE Standards apply, but may be optional in other locations.
1
Available with optional closed-cell foam rings for applications on rough or textured surfaces.
2
To identify the Pad Spread for any specific pad frame configuration, see the illustrations in ASSEMBLY: T
O
C
HANGE THE
P
AD
F
RAME
C
ONFIGURATION
.
3
Load Capacity is based on a friction coefficient of 1; see MAINTENANCE: V
ACUUM
P
AD
M
AINTENANCE
: Friction Coefficient for
additional information.