WOOD'S POWR-GRIP MRTA611LDC User manual

KEEP FOR FUTURE REFERENCE
INSTRUCTIONS
International Version
MODEL NUMBERS: MRTA611LDC,
MRTA6HV11FDC, MRTA610DCO
SERIAL NUMBER: ___________
(please see serial label and record number here)
QUADRA-TILT ROTATOR
DC-VOLTAGE
WITH DUAL VACUUM SYSTEM
READ ALL INSTRUCTIONS AND WARNINGS
BEFORE OPERATING THIS LIFTER
DESIGNED FOR THE MATERIALS HANDLING PROFESSIONAL
P.O. Box 368 –908 West Main
Laurel, MT USA 59044
phone [phone]
phone [phone]
fax [phone]

Rev 14.0/5-13 1 MRTA6-DC: #35072
TABLE OF CONTENTS
SPECIFICATIONS............................................................................................................ 3
WARNINGS ..................................................................................................................... 4
OPERATING FEATURES................................................................................................... 5
ASSEMBLY....................................................................................................................... 6
TO SET UP THE LIFTER ................................................................................................................ 6
TO CHANGE THE PAD FRAME CONFIGURATION ................................................................................7
To Connect/Disconnect Vacuum Hoses..........................................................................................................8
To Reposition (or Remove) Movable Pad Mounts ...........................................................................................9
To Install/Remove Extension Arms................................................................................................................9
About Secondary Rotation Stops ...................................................................................................................9
INTENDED USE ............................................................................................................. 10
LOAD CHARACTERISTICS ........................................................................................................... 10
OPERATING ENVIRONMENT .......................................................................................................11
DISPOSAL OF THE LIFTER ..........................................................................................................11
OPERATION .................................................................................................................. 12
BEFORE USING THE LIFTER........................................................................................................12
Taking Safety Precautions ..........................................................................................................................12
Performing Inspections and Tests ...............................................................................................................12
Confirming the Pad Frame Configuration .....................................................................................................13
TO APPLY THE PADS TO A LOAD..................................................................................................13
Positioning the Lifter on the Load ...............................................................................................................13
Sealing the Pads against the Load...............................................................................................................13
Reading the Vacuum Gauges......................................................................................................................14
Vacuum Level on Optimal Surfaces .............................................................................................................14
Vacuum Level on Other Surfaces ................................................................................................................14
TO LIFT AND MOVE THE LOAD ....................................................................................................15
About the Tilt Linkage ................................................................................................................................15
Engaging or Disengaging Tilt Locks.............................................................................................................15
Load Capacity and the Warning Light ..........................................................................................................15
Monitoring Vacuum Indicators ....................................................................................................................16
Low Vacuum Warning Buzzer .....................................................................................................................16
Controlling the Lifter and Load....................................................................................................................17
In Case of Power Failure ............................................................................................................................17
TO ROTATE THE LOAD EDGEWISE................................................................................................ 17
TO TILT THE LOAD ...................................................................................................................18
TO RELEASE THE PADS FROM THE LOAD .......................................................................................18
AFTER USING THE LIFTER..........................................................................................................19
Storing the Lifter........................................................................................................................................19

Rev 14.0/5-13 2 MRTA6-DC: #35072
MAINTENANCE ............................................................................................................. 20
INSPECTION SCHEDULE.............................................................................................................20
Every-Lift Inspection ..................................................................................................................................20
Frequent Inspection ...................................................................................................................................20
Periodic Inspection.....................................................................................................................................20
Infrequent Use...........................................................................................................................................21
TESTING SCHEDULE..................................................................................................................21
Operational Tests.......................................................................................................................................21
Load Test ..................................................................................................................................................21
MAINTENANCE SCHEDULE..........................................................................................................22
BATTERY TEST .........................................................................................................................22
BATTERY RECHARGE .................................................................................................................22
BATTERY CHARGER TEST ...........................................................................................................23
VACUUM PAD MAINTENANCE......................................................................................................23
Friction Coefficient .....................................................................................................................................23
Inspection .................................................................................................................................................23
Cleaning ....................................................................................................................................................24
VACUUM TEST .........................................................................................................................25
AIR FILTER MAINTENANCE ........................................................................................................26
Filter Function and Conditions Requiring Service ..........................................................................................26
Filter Service Procedures ............................................................................................................................26
VACUUM PUMP MAINTENANCE −DYNAFLO DV1032102 ...............................................................27
Replacing the Diaphragm ...........................................................................................................................27
Replacing the Gasket/Flap Valves................................................................................................................27
Replacing the Head Assembly .....................................................................................................................27
VACUUM PUMP MAINTENANCE −THOMAS 107CDC20 ..................................................................28
Replacing the Diaphragm ...........................................................................................................................28
Replacing the Intake Valve Flapper .............................................................................................................28
Replacing the Exhaust Valve Flapper and Head Gasket .................................................................................28
VACUUM SWITCH ADJUSTMENT ..................................................................................................29
Vacuum Switch Function ............................................................................................................................29
Conditions Requiring Readjustment .............................................................................................................29
Adjustment Procedure ................................................................................................................................30
REPLACEMENT PARTS LIST .......................................................................................... 31
LIMITED WARRANTY.................................................................................................... 32

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SPECIFICATIONS
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. When engaged, tilt locks ensure that the orientation of the
load is not compromised by accidental or unexpected forces.
Rotation Capability:
Manual, 360°, with automatic latching (when desired).
Vacuum Pump:
Diaphragm type, 1 SCFM [28 liters/minute] nominal airflow
Dual Vacuum System:
Two vacuum system circuits allow the lifter to maintain the vacuum level in one circuit even if an
unexpected vacuum loss occurs in the other one (eg, due to load breakage).
Vacuum Reserve Tanks:
Two vacuum reservoirs help prevent immediate vacuum loss in case of power failure and extend battery
life by reducing pump cycles required to maintain vacuum.
Vacuum Gauges:
Two dial gauges indicate current vacuum level in positive inches of Hg and negative kPa.
Low Vacuum Warning Light: Red light is energized until vacuum level is sufficient to lift maximum load weight (higher than 16" Hg [-
54 kPa]) and whenever vacuum loss causes pump to re-engage.
Low Vacuum Warning Buzzer: Maximum Alarm Volume = 103 dBA at 2 ft [60 cm]. While the lifter is powered up, an audible alarm
warns the operator whenever vacuum is not sufficient for lifting the maximum load weight.
Options:
See separate instructions about optional features.
Operating Elevation:
Maximum = 6000 ft [1828 m]
Operating Temperatures:
32° to 104° F [0° to 40° 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 DISPOSAL OF THE LIFTER after its service life, see
INTENDED USE.
ASME Standard BTH-1:
Design Category "B", Service Class "0" (see www.powrgrip.com for more information)
!!-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.
1Optionally available with alternative rubber compounds for special applications (see REPLACEMENTS PARTS LIST).
2Standard with closed-cell foam rings for applications on rough or textured surfaces (see REPLACEMENTS PARTS LIST).
3The illustration under ASSEMBLY: TO CHANGE THE PAD FRAME CONFIGURATION shows the Pad Spread and Maximum Load Capacity
for many of the possible MRTA611LDC pad frame configurations.
4Load Capacity is based on a friction coefficient of 1; see MAINTENANCE: VACUUM PAD MAINTENANCE: Friction Coefficient for
additional information.
Description:
Designed for use with a crane or other hoisting equipment, the MRTA6-DC 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:
MRTA611LDC
MRTA6HV11FDC
MRTA610DCO
Vacuum Pads:1
(Six of standard rubber, spring-mounted with 1/4" [7 mm] travel and #60 filter screen)
11" [28 cm] nominal diameter,
lipped (Model G3370)
10" [25 cm] nom. diameter,
lipped (Model HV11F)2
10" [25 cm] nom. diameter,
concave (Model G0750)
Pad Spread:3
(to outer edges)
Length - Maximum:
104½" [2656 mm]
103½" [2629 mm]
102½" [2604 mm]
- Minimum:
46¾" [1188 mm]
45¾" [1163 mm]
44¾" [1137 mm]
Width - Maximum:
58¾" [1491 mm]
57¾" [1466 mm]
56¾" [1442 mm]
- Minimum:
12½" [317 mm]
11½" [292 mm]
10½" [267 mm]
Load Capacity:3
(rated at 16" Hg [-54 kPa] on clean, smooth, nonporous flat surfaces4)
Per-Pad:
184 lbs [83.5 kg]
150 lbs [68 kg]
150 lbs [68 kg]
Maximum:
1100 lbs [500 kg]
900 lbs [410 kg]
900 lbs [410 kg]
Lifter Weight:
188 lbs [86 kg]
189 lbs [86 kg]
180 lbs [82 kg]
Power Source:
12 volts DC, 10 amps (with Thomas pump) or 3 amps (with Dynaflo pump)
Battery Capacity:
7 amp-hours

Rev 14.0/5-13 4 MRTA6-DC: #35072
WARNINGS
Powr-Grip is pleased to offer the most reliable vacuum lifters available.
Despite the high degree of security provided by this product, certain
precautions must be observed to protect the operator and others.
Always wear personal protective equipment that is appropriate for the material being handled.
Follow trade association guidelines.
Always operate the lifter under conditions approved for its design (see INTENDED USE:
OPERATING ENVIRONMENT).
Never operate a lifter that is damaged, malfunctioning, or missing parts.
Never operate a lifter if the sealing edge of any vacuum pad is cut or otherwise damaged.
Never remove or obscure warning labels.
Never operate a lifter if the Load Capacity or any warning appears to be missing or obscured.
Always make certain the contact surfaces of the load and all vacuum pads are clean prior to
applying the pads (see MAINTENANCE: VACUUM PAD MAINTENANCE).
Never exceed the Load Capacity or attempt to lift loads the lifter is not designed for (see
INTENDED USE: LOAD CHARACTERISTICS).
Never attempt to lift cracked or broken glass with this lifter.
Always position the vacuum pads correctly on the load prior to lifting (see OPERATION: TO APPLY
THE PADS TO A LOAD).
Never lift a load when any vacuum indicator shows inadequate vacuum.
Never touch the vacuum release controls during a lift. This may result in loss of vacuum and
release of the load.
Never allow people to ride on the lifter or the load being lifted.
Never lift a load higher than necessary or leave suspended loads unattended.
Never lift a load over people.
Always keep other personnel far enough away from the lifter to avoid injury in the event of an
unexpected load release.
Always place the power control in the inactive position and, when possible, disconnect the
power source before opening any enclosure on the lifter. (Only applicable to powered lifters)
Always remember that modifications to the lifter may compromise its safety. Wood’s Powr-Grip
cannot be responsible for the safety of a lifter that has been modified by the customer. For
consultation, contact Wood's Powr-Grip (see LIMITED WARRANTY).

Rev 14.0/5-13 5 MRTA6-DC: #35072
OPERATING FEATURES
Note: Components featured in the following instructions for assembling, operating or
maintaining the vacuum lifter are underlined on their first appearance in each section.
Standard MRTA611LDC shown.
1 LIFT SPOOL
8 BATTERY TEST BUTTON
16 Cover for VACUUM PUMP
2 LIFT BAR
9 AIR FILTER
17 VACUUM PAD
3 INSTRUCTIONS CANISTER
10 VALVE HANDLE
with MOVABLE MOUNT
4 BATTERY
11 LOW VACUUM WARNING LIGHT
18 EXTENSION ARM
5 BATTERY GAUGE
12 VACUUM RESERVE TANK
19 TILT LOCK
6 VACUUM GAUGE
13 CONTROL HANDLE
20 BATTERY CHARGER
7 LOW VACUUM WARNING BUZZER
14 PAD FRAME
21 ROTATION RELEASE LEVER
15 QUICK CONNECTOR

Rev 14.0/5-13 6 MRTA6-DC: #35072
ASSEMBLY
TO SET UP THE LIFTER
1) Open the shipping container and remove all materials for restraining or protecting the vacuum
lifter. Save the container for use whenever the lifter is transported.
2) Suspend the lifter from a crane as follows: Select hoisting equipment (crane and hoist, when
applicable) rated to carry the maximum load weight plus the lifter weight (see
SPECIFICATIONS: Maximum Load Capacity and Lifter Weight).
Note: Any application of the lifter must conform to all statutory or regulatory standards that
relate to the hoisting equipment when used in its geographical location (eg, relevant OSHA
standards in the USA).
WARNING: Hoisting equipment hook must be fitted with restraining latch to
prevent lift spool from slipping off under any circumstances.
Make sure the lifter's tilt locks are disengaged (see OPERATION: TO LIFT AND MOVE THE LOAD:
Engaging or Disengaging Tilt Locks). Then raise the lift bar to a vertical orientation and
attach the hoisting equipment hook to the lift spool.
Note: Some hoisting equipment hooks could interfere with an upright load that extends
beyond the lifter's pad frame. If the load would contact the hook during lifter operation, the
operator must prevent this by attaching a sling (or other rigging that does not interfere with
the load) between the hook and the lift spool.
WARNING: Any sling used must be rated to carry maximum load weight plus
lifter weight.
Use the hoisting equipment to raise the lifter out of the shipping container. Be careful to
avoid damaging any vacuum pads. Remove the pad covers and save them for use whenever
the lifter is stored.
3) Arrange the pad frame in the configuration that will provide optimal support of the load while
lifting (see TO CHANGE THE PAD FRAME CONFIGURATION to follow).
4) Connect the electrical connectors uniting the battery to the battery charger and the vacuum
generating system. Now the lifter is operational.
5) Perform Operational and Load Tests for the lifter as directed in MAINTENANCE: TESTING
SCHEDULE.

Rev 14.0/5-13 7 MRTA6-DC: #35072
TO CHANGE THE PAD FRAME CONFIGURATION
The lifter offers a variety of pad frame configurations to accommodate different load dimensions
and weights (see SPECIFICATIONS: Pad Spread and Load Capacity). The following illustration
shows several possible configurations. Select a configuration to provide optimal support across
the load surface and to minimize load overhang (see OPERATION: BEFORE USING THE LIFTER).
Standard MRTA611LDC pad frame shown.

Rev 14.0/5-13 8 MRTA6-DC: #35072
Configurations are created by installing or removing the pad frame’s extension arms, by
repositioning or removing the movable pad mounts, and by connecting or disconnecting the
vacuum hoses to certain vacuum pads. Always assemble the pad frame in a symmetrical
arrangement, to keep the lifter balanced (see illustration).
To support the maximum load weight, all vacuum pads must be installed on the pad frame and
all vacuum hoses must be connected to the vacuum pads. To support the largest load
dimensions, all extension arms must also be installed on the pad frame. To support smaller
weights and dimensions, some extension arms or vacuum pads may be removed, and the
corresponding vacuum hoses may be disconnected, provided that the lifter still has
sufficient capacity to support the load in question .
WARNING: Removing or disconnecting any vacuum pad reduces lifter's load
capacity.
To calculate the load capacity when some vacuum pads are removed, consult the Per-Pad Load
Capacity (see SPECIFICATIONS) and multiply by the number of pads currently in use. Make sure
all vacuum hoses are secure and routed to avoid being pinched, snagged, abraded or otherwise
damaged while the lifter is in operation.
WARNING: Make sure all vacuum hoses are coiled or routed so they cannot
become entangled, kinked or punctured during rotation or tilt.
To Connect/Disconnect Vacuum Hoses
The vacuum hose for each vacuum pad is connected to or
disconnected from the vacuum system by means of a quick
connector. To connect the vacuum hose, push the male and
female ends of the connector together until they lock. To
disconnect the vacuum hose, move the release ring on the
female end away from the male end until the connector
separates. Then clip the free end of the connector to the spring
clip on the extension arm.
Note: Whenever a quick connector is disconnected, the corresponding vacuum pad does not
contribute to the load capacity, whether or not the pad is mounted on the pad frame.
QUICK CONNECTOR
1 FEMALE END
2 MALE END

Rev 14.0/5-13 9 MRTA6-DC: #35072
To Reposition (or Remove) Movable Pad Mounts
1) Remove the cotterless hitch pin from one movable pad mount
by pulling on the pull ring.
2) Move the pad mount to the desired position on the pad frame
and align the holes for the cotterless hitch pin in the pad mount
with the corresponding holes in the pad frame.
3) Secure the pad mount by pushing the cotterless hitch pin
through the holes until the retaining ball emerges on the far side of the pad mount.
4) Make sure that the vacuum hose connecting the vacuum pad to the vacuum system is not
pinched, kinked, cut or abraded and that it will not interfere with lifter operations.
5) Repeat steps #1-4 to position other pad mounts as needed. Always position vacuum pads in
a symmetrical arrangement, and make sure that all vacuum hoses are functioning correctly.
To remove a vacuum pad from the pad frame all together, disconnect the corresponding vacuum
hose and remove the pad mount as directed above. Make sure to store the pad and its mount in
a clean, dry location to protect them from environmental exposure.
To Install/Remove Extension Arms
1) Remove the cotterless hitch pin (see illustration above) from one extension arm by pulling on
the pull ring.
2) Insert the end of the extension arm in its socket on the pad frame, so that the holes align for
the cotterless hitch pin.
3) Secure the extension arm in the pad frame by pushing the cotterless hitch pin through the
holes until the retaining ball emerges on the far side of the pad frame socket.
4) Remove the end of the quick connector from the spring clip on the extension arm, and
connect the vacuum hose as directed above.
5) Repeat steps #1-4 to install other extension arms as needed for the pad frame configuration
desired.
6) To remove extension arms, reverse this procedure. Store removed extension arms in a clean,
dry location to protect them from environmental exposure.
About Secondary Rotation Stops
The lifter features two sets of holes in the rotation wear plate, which function as stops for the
rotation latch. Rotation stops allow the operator to secure the load at each quarter turn of the
rotation, keeping the long dimensions of an upright load either parallel or perpendicular to the
ground. The secondary stops are rotated approximately 30° from the primary stops, to provide
the same load positioning when the pad frame is in a linear configuration (see illustration).
Note: When you are assembling a linear configuration, be sure to install extension arms in the
two sockets as shown in the illustration, since the secondary rotation stops do not align correctly
when the arms are placed in the other two sockets.
COTTERLESS HITCH PIN
1 PULL RING
2 RETAINING BALL

Rev 14.0/5-13 10 MRTA6-DC: #35072
INTENDED USE
LOAD CHARACTERISTICS
WARNING: This lifter is NOT intended for lifting hazardous materials, such as
explosives or radioactive substances.
The operator must verify that the lifter is intended to handle each load, in accordance with the
following requirements:
• The load must not exceed the maximum allowable weight specified under Load Capacity (see
SPECIFICATIONS).
• The load must be a single piece of nonporous or semiporous material with a flat and relatively
smooth contact surface.5To determine whether the load is too porous or rough, perform the
test under Vacuum Level on Other Surfaces (see OPERATION: TO APPLY THE PADS TO A LOAD).
• The load's contact surface must be suitable for obtaining a friction coefficient of 1 with the
lifter's vacuum pads (see MAINTENANCE: VACUUM PAD MAINTENANCE: Friction Coefficient), as
verified by a friction test. If necessary, contact Wood's Powr-Grip for help in conducting a
friction test.
• In order to avoid damaging the vacuum pads, the load's surface temperature must not exceed
the allowable Operating Temperatures (see SPECIFICATIONS). However, if such an
application cannot be avoided, Wood's Powr-Grip does offer a heat-resistant rubber
compound and other solutions which may enable you to lift loads with higher surface
temperatures. Contact Wood’s Powr-Grip or an authorized dealer for more information.
•While the minimum length and width of the load are determined by the Pad Spread (see
SPECIFICATIONS), the maximum length and width are determined by the allowable
overhang, or the amount of load material that can extend sideways beyond the vacuum pads
without breaking or otherwise being damaged.
The allowable overhang depends on the kind of load material being lifted, the thickness of the
material, and the angle at which it is handled (if any). Since materials such as glass, stone or
sheet metal each have different physical properties, the allowable overhang must be
evaluated separately for each type of load. If necessary, contact Wood’s Powr-Grip or an
authorized dealer for help in determining the recommended overhang in a specific situation.
• In order to maintain load stability in the upright position, the maximum allowable thickness of
loads is 1½" [3.8 cm] at the maximum weight (see SPECIFICATIONS: Load Capacity).6This
allowance assumes that the load is centered correctly on the lifter's pad frame (see
OPERATION: TO APPLY THE PADS TO A LOAD: Positioning the Lifter on the Load) and that no
other forces, such as wind pressure, are at work on the load. Either of these circumstances
could reduce the allowable load thickness.
5Lifters that feature concave vacuum pads can also attach to some kinds of curved loads. Since curvature affects the lifting
capacity, contact Wood’s Powr-Grip for help in determining the Load Capacity for a particular curved load.
6This allowance does not account for the use of Pad Spacers (option CM3PE2).
WARNING: Pad Spacers can reduce load
stability in the upright position and, in some cases, the allowable thickness of loads.

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Conversely, allowable thickness increases as load weight decreases. In addition, an operator
may be able to manually counteract the tendency of unstable loads to tilt out of the upright
position, provided that the operator maintains control of the load at all times (see
OPERATION: TO LIFT AND MOVE THE LOAD: About the Tilt Linkage and TO TILT THE LOAD). If
necessary, contact Wood’s Powr-Grip for help in determining the maximum thickness
permitted when handling any specific load.
Note: Vacuum pads can stain or deform load surfaces with light colors or soft coatings. The
operator should test such surfaces for detrimental effects before using the lifter on them.
OPERATING ENVIRONMENT
The operator must determine whether the lifter is intended to be used in each work environment,
in accordance with the following restrictions:
WARNING: Never use lifter in dangerous environments.
• This lifter is not intended for use in any environment that is inherently dangerous to the
operator or likely to compromise the lifter's ability to function. Environments containing
explosives, caustic chemicals and other dangerous substances must be avoided when using
the lifter.
• The lifter's work environment is limited by the Operating Elevation and Operating Temperatures
indicated in SPECIFICATIONS.
• The lifter's work environment must be free of metal particles or any other contaminates that
could damage lifter components through airborne contact or any other means of transmission
in the environment. If such contaminates cause a vacuum pump failure, they could result in a
load release and possible injury to the operator or others nearby.
WARNING: Environmental contaminates could result in vacuum pump failure.
• Using the lifter in wet environments may require the operator to take special precautions:
Moisture on contact surfaces of the load or vacuum pads diminishes the lifter’s slip resistance,
thereby reducing the lifting capacity (see MAINTENANCE: VACUUM PAD MAINTENANCE: Friction
Coefficient).
WARNING: Moisture reduces slip resistance of vacuum pads.
Although the lifter's exterior surfaces can tolerate some exposure to water vapor, they are not
designed to be water-tight. Submerging the lifter or using it in rain may damage lifter
components; these and similar conditions must be avoided.
DISPOSAL OF THE LIFTER
After the vacuum lifter has reached the end of its service life, you must dispose of the lifter in
compliance with all local codes and regulatory standards that are relevant for the geographical
region.
Note: This lifter is equipped with a battery, which may be subject to special disposal regulations.

Rev 14.0/5-13 12 MRTA6-DC: #35072
OPERATION
BEFORE USING THE LIFTER
The operator must determine whether the lifter is capable of performing each intended task, in
accordance with the SPECIFICATIONS and INTENDED USE sections of this INSTRUCTIONS
manual. In addition, all of the following preparations must be completed prior to lifting any load.
Taking Safety Precautions
The operator must be trained in all relevant industry and regulatory standards for the operation
of the vacuum lifter in its geographical location (eg, ASME B30.20 in the USA).
The operator must read and understand this INSTRUCTIONS manual, including all WARNINGS ,
before using the lifter. If necessary, contact Wood’s Powr-Grip or an authorized dealer for
assistance.
WARNING: Always wear appropriate personal protective equipment.
The operator must wear any personal protective equipment and take any other precautions
required to handle the load safely. Consult appropriate trade association guidelines to determine
what precautions are necessary for each type of load material.
Performing Inspections and Tests
WARNING: Always check battery energy before using lifter.
(See MAINTENANCE: BATTERY TEST)
Perform all inspections and tests required by the INSPECTION and TESTING
SCHEDULES (see MAINTENANCE). In addition, if the lifter has been in
storage, always conduct a VACUUM TEST before placing it in service (see
MAINTENANCE).
WARNING: Make sure alarm is clearly audible over ambient noise at operator
position.
The volume of the alarm may be adjusted by rotating the shutter of the low vacuum warning
buzzer. Make sure the alarm is loud enough to be heard over any other noise that may be
present while the lifter is in use. In addition, the alarm must be clearly audible at the maximum
distance the operator may be from the lifter, as well as through any barriers or obstructions
between the operator and the lifter. In order to be considered clearly audible, the alarm
volume must exceed ambient noise by at least 15 dBA at the operator position.
7Since
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.
7Consult CE Standard EN 457 for alternative ways to determine whether the alarm is clearly audible to operators.

Rev 14.0/5-13 13 MRTA6-DC: #35072
CAUTION: Examine each air filter regularly, and empty when necessary.
Two air filters help protect the vacuum generating system from contaminants. However, the
lifter is not intended for use on wet load surfaces because the filters would not prevent liquid
from entering the vacuum system. The operator must examine each filter bowl regularly and
remove any liquid or other contaminants found inside (see MAINTENANCE: AIR FILTER
MAINTENANCE).
Confirming the Pad Frame Configuration
WARNING: Load capacity of lifter can vary, depending on pad frame
configuration.
Make sure the pad frame has been assembled in the configuration that will provide optimal
support of the load while lifting (see ASSEMBLY: TO CHANGE THE PAD FRAME CONFIGURATION). The
pad frame configuration selected must be appropriate, both for the weight and for the
dimensions of the load in question.
TO APPLY THE PADS TO A LOAD
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:
VACUUM PAD MAINTENANCE). Center the lifter’s pad frame to within 2" [5 cm] of the load center,
since off-center loading can cause the load to tilt or rotate unexpectedly (see TO LIFT AND MOVE
THE LOAD: About the Tilt Linkage and TO ROTATE THE LOAD EDGEWISE to follow), and it may also
damage the lifter.8Make sure that all vacuum pads will fit entirely on the load’s contact surface
(see SPECIFICATIONS: 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 TO LIFT AND MOVE THE LOAD: 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.
8The 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 pad frame’s center point. 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.
TO APPLY

Rev 14.0/5-13 14 MRTA6-DC: #35072
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 Gauges
The lifter is equipped with 2 vacuum gauges, which indicate the current vacuum level in each
circuit of 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. Both gauge needles 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] on either vacuum gauge, press on any 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 both vacuum gauges, except when used at high
elevations (see SPECIFICATIONS: Operating Elevation). If not, make sure both vacuum switches
are adjusted correctly (see MAINTENANCE: VACUUM SWITCH ADJUSTMENT). If either vacuum switch
cannot be adjusted to maintain a vacuum of 16" Hg [-54 kPa], perform the VACUUM TEST (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 both vacuum gauges, due to leakage in the seal
between the vacuum pads and the load surface.9In the case of contamination, thoroughly clean
the contact surfaces of the load and the vacuum pads (see MAINTENANCE: VACUUM PAD
MAINTENANCE: 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:
VACUUM TEST).
2) Apply the vacuum pads to the load as previously directed.
3) After the vacuum pump stops running, disconnect the electrical connector uniting the battery
with the vacuum generating system.
Note: After the test is completed, move the valve handle to the “RELEASE” position (power
off ) before reconnecting the battery.
4) Raise the load a minimal distance, to assure that it is supported by the lifter.
5) Monitor both vacuum gauges while the load is suspended for 5 minutes: The lifter must
maintain a minimum vacuum level of 10" Hg [-34 kPa] during this time. If not, the
load does not possess the characteristics required for using this lifter.10
9Contaminated loads can also cause the vacuum pump to run frequently or continuously. Since excessive pumping quickly
reduces battery energy, the operator should clean the load when possible, to minimize pumping.
10 Certain load materials are too rough or porous to allow the lifter to form a seal which can be maintained for 5 minutes without
power. However, in geographical locations where CE Standards do not apply, it may be possible to use the lifter to lift such loads.
Contact Wood’s Powr-Grip for more information.

Rev 14.0/5-13 15 MRTA6-DC: #35072
TO LIFT AND MOVE THE LOAD
About the Tilt Linkage
WARNING: Make sure load is positioned correctly on lifter; unbalanced loads
may tilt unexpectedly.
The lifter’s tilt linkage is designed to automatically hold a balanced load in either the upright or
the flat position. However, an unbalanced load may tilt unexpectedly from the flat position to the
upright position, or vice versa, when lifted. This could result in load damage or injury to anyone
positioned in the tilt path of the load. To minimize the potential for these problems, make certain
prior to lifting any load that it has allowable characteristics (see INTENDED USE: LOAD
CHARACTERISTICS) and is attached correctly to the lifter (see TO APPLY THE PADS TO A LOAD
preceding).
Engaging or Disengaging Tilt Locks
The tilt locks can be used to prevent unexpected tilting motion. Since the lifter is designed to
maintain either the vertical or the horizontal pad frame orientation when correctly loaded, the tilt
locks should only be needed if the operator is not able to maintain control of the load using the
control handle or other appropriate means. For example, if the lifter is being used to install glass
in a multi-story building, engaging the tilt locks would prevent the load from accidentally tilting
due to wind loads or other causes of incidental loading. Tilt locks are intended as a secondary
safety device and do not eliminate the need to center the load correctly on the pad frame (see
TO APPLY THE PADS TO A LOAD: Positioning the Lifter on the Load preceding).
CAUTION: Failure to center load correctly may
damage tilt locks or other lifter
components.
To engage the tilt locks, first make sure the pad frame is
oriented in either the horizontal or the vertical position. Then
turn the T-handles on the spring plungers to the engaged
position, making sure that the noses of both spring plungers
are fully inserted in the notches on the plates where the lifter's
tilt linkage attaches. To disengage the tilt locks, pull the T-
handles outward and turn them to the disengaged position,
making sure that the noses of both spring plungers are fully
retracted from the notches before attempting to tilt the pad frame.
Load Capacity and the Warning Light
The lifter's Load Capacity is rated at a vacuum level of 16" Hg [-54 kPa] (see SPECIFICATIONS).
After the lifter has attained this level, the vacuum pump turns off automatically, to conserve
battery energy. At the same time, the low vacuum warning light turns off, to indicate that the
lifter is ready to lift the maximum load weight.
WARNING: Never attempt to lift load while red warning light is illuminated.
Do not attempt to lift the load while the warning light is illuminated; such an attempt could result
in a load release and possible injury to the operator.
SPRING PLUNGERS
1 NOSE
2 T-HANDLE - ENGAGED
3 T-HANDLE - DISENGAGED

Rev 14.0/5-13 16 MRTA6-DC: #35072
Monitoring Vacuum Indicators
The low vacuum warning light and both vacuum gauges must remain completely visible to the
operator, so that they can be monitored throughout the entire lift.
WARNING: Vacuum indicators must be visible to operator throughout entire lift.
If the vacuum system experiences leakage while the lifter is attached to the load, the vacuum
pump turns on automatically, as required to maintain sufficient vacuum for lifting the maximum
load weight. The low vacuum warning light also turns on and remains illuminated while the
pump is running, to signal the reduction in vacuum to the operator.
If the pump and warning light turn on while you are lifting a load, make sure both vacuum
gauges show a vacuum level of 16" Hg [-54 kPa] or higher. If not, move away and stay clear of
the load until it can be lowered to the ground or a stable support.
WARNING: Stay clear of any suspended load while vacuum level is lower than
16" Hg [-54 kPa].
Discontinue lifter use until the cause of the vacuum loss can be determined. If the pump runs at
intervals of ten minutes or less while the lifter is attached to clean, smooth, nonporous materials,
the leakage is likely to be in the vacuum system. In this event, perform the VACUUM TEST (see
MAINTENANCE) and inspect the vacuum pads for damage (see MAINTENANCE: VACUUM PAD
MAINTENANCE: Inspection). If the vacuum loss cannot be remedied immediately, perform
inspection and maintenance as needed to identify and correct any deficiency before resuming
normal operation of the lifter.
Low Vacuum Warning Buzzer
Using the low vacuum warning buzzer requires minimal interaction from the operator. The
warning buzzer sounds an alarm until the lifter attains sufficient vacuum to lift the maximum load
weight (see SPECIFICATIONS: Load Capacity). After the lifter has attained this vacuum level, the
alarm stops sounding, to indicate that the lifter is ready to lift the load.
WARNING: Never attempt to lift load while alarm is sounding.
Do not attempt to lift the load while the alarm is sounding; such an attempt could result in a load
release and possible injury to the operator.
If the vacuum system experiences leakage while the lifter is attached to the load, the vacuum
pump turns on automatically, as required to maintain sufficient vacuum. The alarm also sounds
while the pump is running, to signal the reduction in vacuum to the operator. If the alarm
sounds while you are lifting a load, make sure the vacuum gauge shows a vacuum level of 16"
Hg [-54 kPa] or higher. If not, immediately move away and stay clear of the load until it can be
lowered to the ground or a stable support.
WARNING: Stay clear of any suspended load while alarm is sounding.
Discontinue lifter use until the cause of the vacuum loss can be determined. Using the lifter on
contaminated, rough or porous surfaces may result in a vacuum loss, due to leakage between
the vacuum pads and the load. Since the alarm may sound in such circumstances, consult the
section TO APPLY THE PADS TO A LOAD: Vacuum Level on Other Surfaces to determine whether the
lifter can be used to lift the load. If the vacuum loss is due to any other cause, perform
inspection and maintenance as needed to identify and correct any deficiency before resuming
normal operation of the lifter.

Rev 14.0/5-13 17 MRTA6-DC: #35072
Controlling the Lifter and Load
When the vacuum indicators show that the lifter is ready, use the hoisting equipment to raise the
lifter and load as needed to clear any obstacles in their path. Use the control handle to keep the
lifter and load in the desired orientation while they are suspended from the crane. Once
sufficient clearance is established, the load can be rotated or tilted as desired (see TO ROTATE THE
LOAD EDGEWISE or TO TILT THE LOAD to follow).
In Case of Power Failure
The lifter is equipped with 2 vacuum reserve tanks, designed to maintain vacuum temporarily in
case of a power failure (ie, in battery).
WARNING: Stay clear of any suspended load in the event of a power failure.
Although the lifter is designed to support the load for at least 5 minutes without power, this
depends on many factors, including the condition of the load and the lifter’s vacuum system (see
INTENDED USE: LOAD CHARACTERISTICS and MAINTENANCE: VACUUM PAD MAINTENANCE,VACUUM
TEST). If a power failure occurs, keep all personnel clear of the suspended load until it can safely
be placed on the ground or a stable support. Correct any deficiency before resuming normal
operation of the lifter.
TO ROTATE THE LOAD EDGEWISE
WARNING: Make sure load is positioned correctly on lifter (see TO APPLY);
unbalanced loads may rotate unexpectedly when latch is
disengaged.
Remember that the load is longer in its diagonal dimensions than in its side
dimensions. Make sure there is sufficient clearance for the load to rotate
without contacting the operator or any nearby objects. Maintain a firm grip
on the control handle to keep the load under control at all times. Pull the
rotation release lever to disengage the rotation latch, and rotate the load to
the desired position.11 To stop the load’s motion automatically at each
quarter turn, simply let go of the rotation release lever immediately before
the end of the turn, so that the rotation latch engages at the next stop.
Whenever rotation is not required, keep the rotation latch engaged, to
prevent accidental damage to the load and possible injury to the operator.
11 If the load's center of gravity is not centered on the pad frame, it may be necessary to relieve pressure on the rotation latch
by applying force to the pad frame in the appropriate direction of rotation.

Rev 14.0/5-13 18 MRTA6-DC: #35072
TO TILT THE LOAD
WARNING: Always keep hands and fingers away from bars of tilt linkage.
Remember that the load requires more vertical space when tilted
to the upright position, as well as more horizontal space when
tilted to the flat position. Make sure there is sufficient clearance
for the load to tilt without contacting the operator or any nearby
objects. Also make sure the tilt locks are disengaged prior to
tilting the load (see TO LIFT AND MOVE THE LOAD: Engaging or
Disengaging Tilt Locks preceding). Then lift upward or press
downward on the control handle to tilt the load as desired. Since
the tilt linkage is designed to automatically maintain the load in
either the upright or the flat position, the load force on the control
handle changes direction during the tilt. If load size permits, maintain control with the handle
throughout the tilt. For loads with overhang, it may be necessary to release the control handle
as the load approaches the flat position. If so, keep the load under control using hand cups or
other appropriate means.
TO RELEASE THE PADS FROM THE LOAD
WARNING: Load must be fully supported before releasing vacuum pads.
When the load is at rest and fully
supported, pinch the valve release lever
against the valve handle, to unlatch the
handle. Then push the valve handle
inward to the “RELEASE” position (power
off), as shown. Do not attempt to move
the lifter until the vacuum pads
disengage completely from the load.
TO RELEASE