WPG MRT4 Series User manual

Rev 29.4/1-22 MRT4-DC: #350701
OPERATING
INSTRUCTIONS 908 W. Main • P.O. Box 368
Laurel, MT USA 59044
800-548-7341 (phone)
406-628-8231 (phone)
406-628-8354 (fax)
www.WPG.com
Record serial number in blank space above (to locate, see serial
label on the product).
MANUAL
ROTATOR/TILTER,
DC-VOLTAGE
Model numbers: MRT411LDC (shown), MRT49DC
KEEP FOR FUTURE REFERENCE
INTENDED FOR USE BY SKILLED
PROFESSIONALS • READ AND
UNDERSTAND BEFORE OPERATING

MRT4-DC: #35070 Rev 29.4/2-222

Rev 29.4/2-22 MRT4-DC: #350701
SPECIFICATIONS .....................................................................................3
SAFETY...................................................................................................5
OPERATING FEATURES............................................................................6
ASSEMBLY..............................................................................................7
TOCHANGE THE PAD FRAME CONFIGURATION ..................................................9
Installing/Removing Extension Arms and Repositioning Vacuum Pads ............................10
Using Secondary Rotation Stops .......................................................................................11
INTENDED USE .....................................................................................12
LOAD CHARACTERISTICS...............................................................................12
OPERATING ENVIRONMENT..........................................................................13
DISPOSAL OF THE LIFTER .............................................................................13
OPERATION..........................................................................................14
BEFORE USING THE LIFTER...........................................................................14
Taking Safety Precautions .................................................................................................14
Performing Inspections and Tests .....................................................................................14
Checking the Battery.........................................................................................................15
TOUSE THE OPTIONAL PAD SHUTOFFS ..........................................................16
TOATTACH THE PADS TO ALOAD ..................................................................17
Positioning the Lifter on the Load.....................................................................................17
Sealing the Pads on the Load............................................................................................18
Reading the Vacuum Gauge..............................................................................................18
TOLIFT AND MOVE THE LOAD......................................................................19
Interpreting the Warning Light and Optional Warning Buzzer .........................................19
Monitoring Vacuum Indicators .........................................................................................19
Controlling the Lifter and Load .........................................................................................20
In Case of a Power Failure.................................................................................................20
TOROTATE THE LOAD .................................................................................21
TOTILT THE LOAD ......................................................................................22
TORELEASE THE PADS FROM THE LOAD .........................................................24
AFTER USING THE LIFTER.............................................................................24
Storing the Lifter ...............................................................................................................24
Transporting the Lifter ......................................................................................................25
TABLE OF CONTENTS

MRT4-DC: #35070 Rev 29.4/2-222
INSPECTIONS AND TESTS.....................................................................26
INSPECTION SCHEDULE ................................................................................26
TESTING ...................................................................................................27
Lifter/Load Compatibility Test...........................................................................................27
Operational Tests ..............................................................................................................28
Vacuum Test......................................................................................................................28
Rated Load Test.................................................................................................................29
MAINTENANCE ....................................................................................30
VACUUM PAD MAINTENANCE.......................................................................30
Pad-to-Load Friction Coefficient .......................................................................................30
Pad Inspection ..................................................................................................................30
Pad Cleaning .....................................................................................................................31
BATTERY RECHARGE....................................................................................32
REPLACEMENT PARTS...........................................................................33
LIMITED WARRANTY ............................................................................34
TOOBTAIN REPAIRS OR WARRANTY SERVICE...................................................34
TABLE OF CONTENTS

Product
Description
Designed for use with hoisting equipment, MRT4-DC lifters support loads using vacuum and manipulate
loads using manual 360° rotation and manual 90° tilt motions.
Model
Number MRT49DC MRT411LDC
Vacuum Pads1
1...... Available with other rubber compounds for special purposes (see www.wpg.com).
(4 each, standard rubber)
9" [23 cm] nom. diameter
(Model VPFS9)
11" [28 cm] nom. diameter,
lipped (Model G3370)
Pad Spread2
2...... The illustrations under “TOCHANGE THE PAD FRAME CONFIGURATION”show the Pad Spread for all approved MRT411LDC pad frame configurations.
---------------------------- (to outer edges) ----------------------------
Length ‒Maximum 75¼" [192 cm] 78¼" [199 cm]
Length ‒Minimum 29¾" [76 cm] 32¾" [83 cm]
Width ‒Maximum 46½" [119 cm] 49½" [126 cm]
Width ‒Minimum 12¾" [33 cm] 15¾" [40 cm]
Maximum Load
Capacity3
3...... The Maximum Load Capacity is rated at a vacuum of 16" Hg [-54 kPa] on clean, smooth, nonporous flat surfaces with a friction coefficient of 1. Pad
compound, load rigidity, strength, surface conditions, overhang, angle, center of gravity and temperature can also affect the lifting capacity. A “qualified
person” should evaluate the effective lifting capacity for each use (see definition under “Rated Load Test”).
Per pad: 125 lbs [56.5 kg]
Total: 500 lbs [225 kg]
Per pad: 175 lbs [80 kg]
Total: 700 lbs [320 kg]
Lifter
Weight 135 lbs [62 kg]
Power
Source 12 volts DC, 3.5 amps
Battery
Capacity 7 amp-hours
Rotation
Capability Manual, 360°, with latching at each ¼ turn (when required)
Tilt
Capability Manual, 90°, with automatic locking in vertical position
Product
Options
Available with Individual Pad Shutoffs.
See separate instructions about other options.
Operating
Elevation Up to 6,000' [1,828 m]
Operating
Temperatures 32° — 104° F [0° — 40° C]
Service
Life 20,000 lifting cycles, when used and maintained as intended4
4...... Vacuum pads, filter elements and other wear-out items are excluded.
ASME Standard
BTH-1 Design Category "B", Service Class "0"
Troubleshooting
Guide5
5...... To view this guide, click the link at right. Additionally, you can search for your lifter's Model Number at www.wpg.com and select the “Troubleshooting” link
on the product page.
TST-011_MRT4DC-SVS_rev2013-049
Rev 29.4/2-22 MRT4-DC: #350703
SPECIFICATIONS

MRT4-DC: #35070 Rev 29.4/2-224
Note: A standard MRT411LDC3 is shown.
SPECIFICATIONS

Rev 29.4/2-22 MRT4-DC: #350705
SAFETY
Wear personal protective
equipment that is appropriate for
the load material. Follow trade
association guidelines.
Do not remove or obscure safety
labels.
Do not make any modifications to
the lifter (see “LIMITED
WARRANTY”).
Use the lifter only in an approved
“OPERATING ENVIRONMENT”(see
“INTENDED USE”).
Do not use a lifter that is damaged,
malfunctioning, or missing parts.
Do not use a lifter if the sealing
edge of any vacuum pad is cut or
otherwise damaged.
Do not use a lifter to lift cracked or
broken glass.
Do not exceed the Maximum
Load Capacity or lift loads the
lifter is not designed for (see
“INTENDED USE”).
Do not use a lifter if the
Maximum Load Capacity or
any safety label appears to be
missing or obscured.
Make sure the contact surfaces of
the load and vacuum padsare clean
before attaching the lifter (see
“MAINTENANCE”).
Position the vacuum pads correctly
on the load before lifting (see
“OPERATION: Positioning the Lifter
on the Load”).
Do not lift a load if any vacuum
indicator shows inadequate
vacuum.
Keep unauthorized personnel away
from the lifter, to avoid injury in
case of an unintended load release.
Do not touch the vacuum release
controls during a lift.
Do not allow people to ride on the
lifter or the load.
Do not lift a load higher than
necessary or leave suspended loads
unattended.
Do not position a loaded or
unloaded lifter over people.
Before servicing a powered lifter,
place the power control in the
inactive position and, when
possible, disconnect the power source.

MRT4-DC: #35070 Rev 29.4/2-226
Features shown here are underlined on their first appearance in each section following.
1 INSTRUCTIONS CANISTER 2 TILT RELEASE LEVER 3 Enclosure w/ VACUUM SWITCH
4 LOW VACUUM WARNING LIGHT 5 BATTERY GAUGE 6 BATTERY TEST BUTTON
7 AIR FILTER 8 LOW VACUUM WARNING BUZZER (optional) 9 VALVE HANDLE
10 VACUUM GAUGE 11 ROTATION WEAR PLATE 12 Cover for VACUUM PUMP
13 ROTATION RELEASE LEVER 14 VACUUM RESERVE TANK 15 PAD FRAME
16 CONTROL HANDLE 17 COTTERLESS HITCH PIN 18 EXTENSION ARM
19 VACUUM PAD w/ MOVABLE
PAD MOUNT 20 BATTERY 21 LIFT BAR
22 LIFT POINT Not shown: BATTERY CHARGER
Note: A standard MRT411LDC is shown. Although some of the following photos do not show this
specific lifter, they all illustrate how this kind of lifter functions.
For information about specific parts, see “REPLACEMENT PARTS” and/or any separate
instructions for Product Options.
OPERATING FEATURES

Rev 29.4/2-22 MRT4-DC: #350707
1)
2A 2B
Remove all shipping materials and save them with the shipping container for future use.
2) Suspend the lifter from appropriate hoisting equipment:
2.1) Select a crane and/or hoist rated for the Maximum Load Capacity plus the
Lifter Weight.
Note: Any lifter use must comply with all statutory or regulatory standards for hoisting
equipment in your region.
2.2) Disengage any tilt locks or latches, and raise the lift bar (figs. 2A-C).
2.3) Attach the hoisting hook to the
lift point (figs. 2D-E).
2D 2E
Make sure
hook has
restraining latch
(circled).
2F
Only use rigging rated for Maximum Load
Capacity plus Lifter Weight.
Use
rigging (fig. 2F) as needed to
make sure the hook does not
interfere with the load.
ASSEMBLY
2C

MRT4-DC: #35070 Rev 29.4/2-228
2.4) Use the hoisting equipment to remove the lifter from the shipping container. Avoid
damaging the vacuum pads.
3B3A
3)
3C
3D
Connect the electrical connectors (figs. 3A-B and
figs. 3C-D).
4)
4A
Assemble the pad frame for optimal load support
(see “TOCHANGE THE PAD FRAME CONFIGURATION”). Remove
the pad covers (fig. 4A) and save them for future use.
5) Perform tests as required under “TESTING”.
ASSEMBLY

Rev 29.4/2-22 MRT4-DC: #350709
TOCHANGE THE PAD FRAME CONFIGURATION
ASSEMBLY

MRT4-DC: #35070 Rev 29.4/2-2210
Various pad frame configurations enable the lifter to match different load dimensions. The
illustrations on the preceding page show all approved configurations. Dimensions show Pad
Spread for a standard MRT411LDC lifter (see “SPECIFICATIONS” for other models).
1)
Use only approved pad frame
configurations.
Securely position vacuum hoses to
avoid damage during lifter operation.
Choose an approved configuration to
maximize support across the load
surface and to minimize load overhang
(see “LOAD CHARACTERISTICS”).
2) Install or remove the extension arms
and reposition the movable pad mounts as needed.
Installing/Removing Extension Arms and Repositioning Vacuum Pads
1)
4A 4B
3B
2A
3A
1A
Remove the cotterless hitch
pin (circled in fig. 1A) that
secures the movable pad
mount to the pad frame.
2) Remove the vacuum pad
from the pad frame (fig. 2A).
3) Insert the extension arm into
the pad frame (fig. 3A). Then
insert a cotterless hitch pin
to secure it (fig. 3B).
4) Position the movable pad
mount on the extension arm
(fig. 4A). Then insert a
cotterless hitch pin to secure
it (fig. 4B).
Notes: Repeat or reverse these
steps to configure the pad frame as
needed. Store removed
components in a clean, dry
location.
ASSEMBLY

Rev 29.4/2-22 MRT4-DC: #3507011
Using Secondary Rotation Stops
Align the secondary rotation stops for correct use of the pad frame in long, narrow
configurations.
ASSEMBLY

MRT4-DC: #35070 Rev 29.4/2-2212
INTENDED USE
LOAD CHARACTERISTICS
Do NOT lift explosives, radioactive
substances or other hazardous materials.
Make sure the vacuum lifter is intended
to handle each load according to these
requirements:
• The load weight must not exceed the Maximum Load Capacity.
• The load must be a single piece of relatively nonporous material with a flat and
relatively smooth contact surface.1, 2To determine whether the load is too porous or
rough, perform the “Lifter/Load Compatibility Test”.
• The load's contact surface must be able to obtain a friction coefficient of 1 with the lifter's
vacuum pads(see “Pad-to-Load Friction Coefficient”). Otherwise, the capacity should be
derated appropriately.
• The load's surface temperature must not exceed the Operating Temperatures.3
• The load's minimum length and width are determined by the current Pad Spread
(see “SPECIFICATIONS”).
• The load's maximum length and width are determined by its allowable overhang.4
•1" [2.5 cm] is the allowable thickness at Maximum Load Capacity.5
Note: Standard vacuum pads can stain or deform load surfaces with light colors or soft
coatings. Test such surfaces for damaging effects before using the lifter on them.6
1..... Although concave vacuum pads can also attach to some curved loads, curvature can reduce lifting capacity. Contact WPG for more information.
2..... A “single piece” of material includes curtainwall assemblies, unitized glazing systems and similar construction units.
3..... Vacuum pads made from a heat-resistant rubber compound can enable you to lift loads with higher surface temperatures. Contact WPG or an
authorized dealer for more information.
4..... The allowable overhang is the amount of load material that can extend sideways beyond the vacuum pads without breaking or otherwise being
damaged. This depends on the load material, its thickness, and the angle of handling (if any). Since every material has different physical
properties, the allowable overhang must be evaluated separately for each load type. Contact WPG or an authorized dealer for more
information.
5..... However, the allowable thickness increases as load weight decreases. Contact WPG for more information.
6..... Alternative rubber compounds are available for these purposes. Contact WPG or an authorized dealer for more information.

Rev 29.4/2-22 MRT4-DC: #3507013
OPERATING ENVIRONMENT
Make sure the vacuum lifter is intended for use in each work environment, given the following
restrictions:
•
Never use lifter
in dangerous
environments.
This lifter is not intended for any environment that is
dangerous to the operator or damaging to the lifter. Avoid
environments containing explosives, caustic chemicals and
other dangerous substances.
Metal particles and similar environmental contaminants could result in
vacuum pump failure.
• The work environment is limited by the Operating Elevation and Operating
Temperatures.1, 2
• The lifter is not designed to be watertight.
Moisture can result in
reduced lifting capacity.
Do not
use it in rain or other unsuitable conditions.
CE/UKCA — A secondary positive holding device is required to lift loads on construction sites.
DISPOSAL OF THE LIFTER
After the Service Life of the vacuum lifter has ended (see “SPECIFICATIONS”), dispose of it in
compliance with all local codes and applicable regulatory standards.
Note: Special disposal regulations may apply to the battery.
1..... Although lifter use may be possible at higher elevation, lifting capacity is reduced whenever the lifter is unable to attain vacuum in the green
range on the vacuum gauge. Contact WPG for more information.
2..... Special provisions may allow the lifter to operate outside the specified temperature range. Contact WPG for more information.
INTENDED USE

MRT4-DC: #35070 Rev 29.4/2-2214
OPERATION
BEFORE USING THE LIFTER
Determine whether the vacuum lifter is capable of each intended task (see “SPECIFICATIONS”
and “INTENDED USE”). Then complete the following preparations:
Taking Safety Precautions
•
Read all directions and safety rules before using
lifter.
Always wear appropriate personal protective
equipment.
Be trained in all industry
and regulatory standards
for lifter operation in your
region.
• Follow trade association
guidelines about precautions needed for each load material.
Performing Inspections and Tests
• Follow the “INSPECTION SCHEDULE”and “TESTING”.
•
Examine air filter regularly
and service when needed.
Service the air filter whenever its bowl contains
liquid or other contaminates, or its element
appears dirty (see “AIR FILTER MAINTENANCE”in
SERVICE MANUAL).
•
1A
If the lifter has a low vacuum warning buzzer (fig. 1A), make sure it is
clearly audible at the maximum distance between the operator and
the lifter, despite any barriers or obstacles.1, 2
Make sure warning buzzer can be heard over noise at
operator position.
1..... Maximum buzzer volume is 103 dBA at 2' [60 cm]. If CE or UKCA Standards apply, consult EN 7731 to make sure the warning buzzer is compliant.
2..... The “Vacuum Test” provides a convenient opportunity to check this.

Rev 29.4/2-22 MRT4-DC: #3507015
Checking the Battery
Always check battery energy before
every lift.
Use the battery gauge to determine whether the battery needs to be charged (see ).1Never use
the lifter unless battery energy appears in the green range.
• While the valve handle is in the “attach” position ( / power on), the battery gauge
automatically shows battery energy.2
•While the valve handle is in the
“release” position ( / power off),
use the battery test button (circled)
to check the battery energy.3
1..... If the vacuum pump is running or the battery charger is connected to an AC power source, the battery gauge will shown an inaccurate energy
level.
2..... After the pump stops running, the battery gauge requires a few moments to stabilize before it shows an accurate energy level.
3..... If the lifter has not been used since the battery was charged, the battery gauge may falsely show a high energy level. This “surface charge”
dissipates after the pump runs for about 1 minute, allowing the gauge to show accurate energy.
OPERATION

MRT4-DC: #35070 Rev 29.4/2-2216
TOUSE THE OPTIONAL PAD SHUTOFFS
Each pad shutoff on the pad frame controls the vacuum line to the adjacent vacuum pad.
Activating or deactivating the airflow at specific pads enables the lifter to handle loads with
different weights and dimensions (see “SPECIFICATIONS”) or to avoid holes in the load surface.
Closing any pad shutoff
reduces lifting capacity.
To support the maximum load weight and larger load
dimensions, all pads must be activated; for smaller weights
and dimensions, some pads may be deactivated, provided
that the lifter still has sufficient capacity to support the
load (see “LOAD CHARACTERISTICS”).
1A 1B
To activate a pad,
open the shutoff
valve (ie, place
lever parallel with
vacuum line —
fig. 1A).
To deactivate a
pad, close the
shutoff valve (ie,
place lever
perpendicular to
vacuum line —
fig. 1B).
To calculate the lifting capacity when some pads are deactivated, consult the Per-Pad Load
Capacity and multiply by the number of pads currently activated. Always activate pads in
a symmetrical configuration and use as many pads as possible for each load being lifted, to
maximize lifting capacity and to minimize load overhang.
OPERATION

Rev 29.4/2-22 MRT4-DC: #3507017
TOATTACH THE PADS TO ALOAD
Make sure the contact surfaces of the load and vacuum pads are clean (see
“Pad Cleaning”).
Positioning the Lifter on the Load
1)
1A
Center the pad frame on the
load (fig. 1A).1
2)
2A
Make sure all vacuum pads
will fit on the load and will be
loaded evenly (fig. 2A).
Consult the Per-Pad
Load Capacity.
3) Place the vacuum pads in
contact with the load surface.
1..... The lifter is designed to handle the maximum load weight when the load’s center of gravity is positioned within 2" [5 cm] of the lifter’s rotation
axis. Uncentered loads may rotate or tilt unexpectedly (as applicable).
OPERATION

MRT4-DC: #35070 Rev 29.4/2-2218
Sealing the Pads on the Load
1)
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.
2) 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.2If it does not:
• Make sure the vacuum switch is adjusted correctly (see SERVICE MANUAL).
• When necessary, perform the “Vacuum Test”.
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”), it may not be able to maintain sufficient vacuum for lifting.
Contact WPG for more information.
OPERATION