WPG PT410AC User manual

KEEP FOR FUTURE REFERENCE
INSTRUCTIONS
International Version
MODEL NUMBER: PT410AC
SERIAL NUMBER: ___________
(please see serial label and record number here)
"WINDSHIELD LIFTER"
POWER TILTER
AC-VOLTAGE
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 14.0/4-18 1 PT410AC: #35140
TABLE OF CONTENTS
TABLE OF CONTENTS ...................................................................................................... 1
SPECIFICATIONS............................................................................................................ 3
WARNINGS ..................................................................................................................... 4
OPERATING FEATURES................................................................................................... 5
ASSEMBLY....................................................................................................................... 6
INTENDED USE ............................................................................................................... 8
LOAD CHARACTERISTICS ................................................................................................... 8
OPERATING ENVIRONMENT ................................................................................................ 9
DISPOSAL OF THE LIFTER................................................................................................... 9
OPERATION .................................................................................................................. 10
BEFORE USING THE LIFTER .............................................................................................. 10
Taking Safety Precautions ..........................................................................................................................10
Performing Inspections and Tests ...............................................................................................................10
TO APPLY THE PADS TO A LOAD ........................................................................................ 11
Generating Vacuum Flow............................................................................................................................11
Positioning the Lifter on the Load ...............................................................................................................11
Reading the Vacuum Gauge .......................................................................................................................12
Vacuum Level on Optimal Surfaces .............................................................................................................12
Vacuum Level on Other Surfaces ................................................................................................................12
TO LIFT AND MOVE THE LOAD........................................................................................... 13
Load Capacity and the Lift Light..................................................................................................................13
Monitoring Vacuum Indicators ....................................................................................................................13
Controlling the Lifter and Load....................................................................................................................13
In Case of Power Failure ............................................................................................................................14
TO TILT THE LOAD .......................................................................................................... 14
TO RELEASE THE PADS FROM THE LOAD.............................................................................. 14
AFTER USING THE LIFTER ................................................................................................ 15
Storing the Lifter........................................................................................................................................15
MAINTENANCE.............................................................................................................. 16
INSPECTION SCHEDULE ................................................................................................... 16
Every-Lift Inspection ..................................................................................................................................16
Frequent Inspection ...................................................................................................................................16
Periodic Inspection ....................................................................................................................................16
Infrequent Use ..........................................................................................................................................17
TESTING SCHEDULE ........................................................................................................ 17
Operational Tests.......................................................................................................................................17
Load Test ..................................................................................................................................................17
MAINTENANCE SCHEDULE ................................................................................................ 17

Rev 14.0/4-18 2 PT410AC: #35140
VACUUM PAD MAINTENANCE............................................................................................ 18
Friction Coefficient .....................................................................................................................................18
Inspection .................................................................................................................................................18
Cleaning ....................................................................................................................................................19
VACUUM TEST ............................................................................................................... 19
AIR FILTER MAINTENANCE −LARGE ................................................................................. 20
Filter Function and Conditions Requiring Service ..........................................................................................20
Filter Service Procedures ............................................................................................................................20
VACUUM PUMP MAINTENANCE −GAST 0523-101Q-SG588DX .......................................... 21
Disassembly/Reassembly Procedure ............................................................................................................21
VACUUM PUMP MAINTENANCE −GAST N70....................................................................... 22
A) Dissembling the Head Assembly .............................................................................................................22
B) Replacing the Head-Side Leaf Valves.......................................................................................................22
C) Replacing the Cylinder-Side Leaf Valves ..................................................................................................22
D) Dissembling the Cylinder Assembly.........................................................................................................22
E) Replacing the Cylinders and Cups ...........................................................................................................23
F) Replacing O-Rings and Reassembling the Head Assembly.........................................................................23
LINEAR TILT ACTUATOR .................................................................................................. 24
VACUUM SWITCH ADJUSTMENT ........................................................................................ 25
Vacuum Switch Function ............................................................................................................................25
Conditions Requiring Readjustment .............................................................................................................25
Adjustment Procedure ................................................................................................................................25
REPLACEMENT PARTS LIST .......................................................................................... 26
LIMITED WARRANTY................................................................................................. 27

Rev 14.0/4-18 3 PT410AC: #35140
SPECIFICATIONS
Model Number:
PT410AC
Description:
Designed for use with a crane or other hoisting equipment, the PT410AC lifter
employs vacuum to hold a load for lifting, and it provides
powered 90° tilt
movement for load manipulation.
Power Source:
See serial number plate for specific AC voltage, frequency and amperage.
Vacuum Pads:
Four 10" [25 cm] nominal diameter, concave (Model G0750), standard rubber,
spring-mounted (approx. 1" [2.5 cm] travel), with #60 filter screen
Pad Spread:
17" x 45½" [433 mm x 1157 mm] to outer edges
Load Capacity:
(rated at 16" Hg [-54 kPa] on clean, smooth, nonporous flat surfaces
1
)
Per-Pad
125 lbs [56.5 kg]
Maximum
500 lbs [225 kg]
Lifter Weight:
165 lbs [75 kg]
Tilt Capability:
Powere
d, 90°; Speed = approx. 6.5 seconds; Duty = 81 tilts per hour
Vacuum Pump:
Rotary vane type, 4 SCFM [113 liters/minute] nominal airflow
or
Wobble piston, 4 SCFM [113 liters/minute] nominal airflow
Vacuum Reserve Tank:
Vacuum reservoir helps prevent immed
iate 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:
See separate instructions about optional features.
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 servi
ce 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.wpg.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.
1Load Capacity is based on a friction coefficient of 1; see MAINTENANCE: VACUUM PAD MAINTENANCE: Friction Coefficient for
additional information.

Rev 14.0/4-18 4 PT410AC: #35140
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).
Always employ a ground fault circuit interrupter when connecting the power cable to the power
source.

Rev 14.0/4-18 5 PT410AC: #35140
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 PT410AC shown.
1 LIFT SPOOL
6 VACUUM GAUGE
12 PAD FRAME
2 POWER SWITCH
7 AIR FILTER
13 VACUUM RELEASE BUTTON
3 VACUUM LIFT LIGHT
8 VACUUM PAD
14 MOVABLE CONTROL PENDANT
4 LIFT BAR
9 ALTERNATIVE LOCATION FOR PENDANT
15 TILT TOGGLE SWITCH
5 Enclosure with
10 VACUUM RESERVE TANK
16 VACUUM PUMP
VACUUM SWITCH
11 CONTROL HANDLES
17 TILT ACTUATOR

Rev 14.0/4-18 6 PT410AC: #35140
ASSEMBLY
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) Connect the power cable from the lifter to the power source as follows: Identify the label
indicating the voltage range (V) and frequency (Hz) required to power the lifter (located
where power cable connects to lifter). Then wire the female connector provided to an
appropriate, current-protected power source.
WARNING: Wiring must be done by qualified personnel, taking all appropriate
safety precautions.
Note: Be advised that brown-outs, overtaxed generators, extension cords, and other
conditions can reduce power input at the lifter. If the lifter does not receive adequate power
while lifting, this could result in an unexpected load release and a risk of injury to the
operator or others.
WARNING: Lifter that does not receive adequate power while lifting could
experience unexpected load release.
The power source must be equipped with a ground fault circuit interrupter, in order to reduce
the risk of electrical shocks.
WARNING: Power source must be equipped with ground fault circuit interrupter.
Make certain the power cable is routed so that it does not become tangled while operating
the lifter or hoisting equipment. Then push the power cable’s male connector into the female
connector and twist to secure them together.
3) 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).
CAUTION: Always provide manual assistance to tilt actuator when raising lift bar
to vertical position.
Raise the lift bar of the lifter to a vertical orientation: Engage the tilt actuator as though
tilting a load downwards (see OPERATION: TO TILT THE LOAD); at the same time, manually lift
on the lift bar to assist the tilt actuator’s movement, in order to avoid damaging the actuator.
Then attach the hoisting equipment hook to the lift spool.
WARNING: Hoisting equipment hook must be fitted with restraining latch to
prevent lift spool from slipping off under any circumstances.

Rev 14.0/4-18 7 PT410AC: #35140
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.
Note: The lifter is equipped with a movable control pendant, which can be placed in two
locations on the lifter or moved away from the lifter, to allow for different operator positions.
Position the control pendant on either the lift bar or the pad frame, depending on which
location is more convenient for the expected application of the lifter (see OPERATING
FEATURES).
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. Now the lifter is operational.
4) Perform Operational and Load Tests for the lifter as directed in MAINTENANCE: TESTING
SCHEDULE.

Rev 14.0/4-18 8 PT410AC: #35140
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:
• This lifter is designed to lift windshields, or similar loads, that vary in curvature.2Nevertheless,
some extreme curves may prevent the lifter from attaching to a load. Other curves may allow
the lifter to attach but require manual assistance from the operator, in order to establish a
seal between the vacuum pads and the load (see OPERATION: TO APPLY THE PADS TO A LOAD).
Because the lifter is designed to accommodate extreme variations in load shape, the lifter
places some stress on most windshields being lifted. The location and magnitude of the
stresses vary with each lift, according to the windshield curvature and the placement of the
lifter on the windshield.
• 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 semicurved and
relatively smooth contact surface. To 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.
2The minimum continuous radius at the attachment area of the load must be either 45" [115 cm] around an axis parallel to the
lifter's tilt axis or 95" [242 cm] around an axis perpendicular to the tilt axis (but not both). However, compound curves and
complex shapes may permit loads with tighter radii to be lifted.

Rev 14.0/4-18 9 PT410AC: #35140
• 1" [2.5 cm] is the maximum allowable thickness of loads at the maximum weight (see
SPECIFICATIONS: Load Capacity). However, allowable thickness increases as load weight
decreases. 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.
• !!-CE-!! If the lifter is employed in a construction area, CE Standard EN 13155 requires the
use of a secondary positive holding device, such as a sling system, designed to support the
load in case of a vacuum system failure.
WARNING: Where CE Standards apply, secondary positive holding device is
required for lifting loads in construction zones.
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.

Rev 14.0/4-18 10 PT410AC: #35140
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.
In addition, 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
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).
CAUTION: Examine each air filter regularly, and empty when necessary.
The lifter is equipped with one or more air filters to help protect the vacuum system from
contaminants.3In order for a filter to function, the operator must empty the filter bowl before
enough liquid accumulates to contact any portion of the filter element (see MAINTENANCE: AIR
FILTER MAINTENANCE).
3In order for the operator to use the lifter on wet load surfaces, it must be equipped with 2 or more filters that are connected
in
series . However, see MAINTENANCE: VACUUM PAD MAINTENANCE: Friction Coefficient before using the lifter on wet load surfaces.

Rev 14.0/4-18 11 PT410AC: #35140
TO APPLY THE PADS TO A LOAD
Generating Vacuum Flow
Place the power switch in the “on” position ( ). This engages the vacuum pump, causing air to
be drawn immediately at the vacuum pads.4
WARNING: Never turn power off during operation; keep pump running
throughout lift.
The lifter is designed for the vacuum pump to run continuously. Placing the power switch in the
“off” position ( ) during lifter operation could result in the release of the load and possible
injury to the operator (see TO LIFT AND MOVE THE LOAD: In Case of Power Failure to follow).
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). Note: The lifter must be attached only to the outside (convex)— not
the inside (concave)—surface of a windshield.
Center the lifter’s pad frame to within 2" [5 cm] of the load center, since off-center loading can
interfere with the lifter’s tilt capability (see TO TILT THE LOAD to follow), and it may also damage
the lifter.5The long dimension of the pad frame must lie along the greatest curvature of the
load. Make 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 until all pads seal
against the contact surface, allowing pads to pivot as needed to align with the surface. It may
be necessary to rock individual pad mounts to help position the pads against the load and
establish a seal.
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.
WARNING: Do not disconnect control pendant during lifter operation.
The movable control pendant is not intended to be disconnected during lifter operation.
Disconnecting the control pendant is likely to result in a load release and injury to the operator or
others nearby.
4If the vacuum pump or any other powered component fails to function while the power switch is in the “on” position, make
sure the lifter is connected correctly to an appropriate power source, as directed in the ASSEMBLY section. If so, examine each
circuit breaker (adjacent to power switch) to determine whether it has interrupted the electrical circuit to the component.
Although the operator can reset the circuit breaker, the power interruption may indicate an electrical problem that requires
attention. Correct any deficiency before resuming normal operation of the lifter (see wiring diagram provided).
5The 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.

Rev 14.0/4-18 12 PT410AC: #35140
Reading the Vacuum Gauge
The vacuum gauge indicates the current vacuum level in 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. The
gauge needle 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], 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 the vacuum gauge, except when used at high
elevations (see SPECIFICATIONS: Operating Elevation). If not, 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 the vacuum gauge, due to leakage in the seal
between the vacuum pads and the load surface. In 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) When the vacuum level registers above 16" Hg [-54 kPa] on the vacuum gauge (see TO LIFT
AND MOVE THE LOAD: Load Capacity and the Lift Light to follow), place the power switch in the
“off” position ( ).
4) Raise the load a minimal distance, to assure that it is supported by the lifter.
5) Monitor the vacuum gauge 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.6
6Certain 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 14.0/4-18 13 PT410AC: #35140
TO LIFT AND MOVE THE LOAD
WARNING: Lift bar must be oriented vertically to lift
load.
Load Capacity and the Lift Light
A 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 green vacuum lift light turns on to indicate that the
lifter is ready to lift the maximum load weight.
WARNING: Never attempt to lift load unless green lift light is illuminated.
Do not attempt to lift the load unless the lift light is illuminated; such an attempt could result in a
load release and possible injury to the operator.
Monitoring Vacuum Indicators
The vacuum lift light and the vacuum gauge 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.
The lifter’s vacuum pump runs continuously to maintain sufficient vacuum for lifting the
maximum load weight. If the vacuum system experiences leakage while the lifter is attached to
the load, the lift light turns off automatically, to signal the reduction in vacuum to the operator.
If the lift light turns off while you are lifting a load, make sure the vacuum gauge shows 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 lift light does
not turn on when 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.
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 handles 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 tilted as desired (see TO TILT THE LOAD to
follow).

Rev 14.0/4-18 14 PT410AC: #35140
In Case of Power Failure
The lifter is equipped with a vacuum reserve tank, designed to maintain vacuum temporarily in
case of a power failure.
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 TILT THE LOAD
CAUTION: Make sure load is positioned correctly on lifter (see TO APPLY); unbalanced
loads may damage lifter.
Remember that the load requires more vertical space when tilted
upwards, as well as more horizontal space when tilted
downwards. Make sure there is sufficient clearance for the load
to tilt without contacting the operator or any nearby objects. The
tilt toggle switch on the movable control pendant controls the
powered tilt motion: To tilt the load upwards, push the toggle
towards the vacuum release button (also on control pendant); to
tilt the load downwards, push the toggle away from the release
button. Releasing the toggle switch locks the load in any position
within the 90° range of tilt movement.
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, push the vacuum release button ( ) on the
movable control pendant to force air into the vacuum pads, quickly breaking the vacuum seal.
After the pads have disengaged completely from the load, move the lifter away. Continue to
hold the release button until the pads are well away from the load; otherwise, the lifter would
reattach itself to the load.

Rev 14.0/4-18 15 PT410AC: #35140
AFTER USING THE LIFTER
Place the power switch in the “off” position ( ).
CAUTION: Do not set the lifter against any surfaces which could soil or damage the
vacuum pads.
Use the hoisting equipment to gently lower the lifter onto a stable support; then detach the
hoisting equipment hook from the lift spool.
If the lifter is transported to another location, use the original shipping container and secure the
lifter so as to protect the vacuum pads and all other components from damage while in transit.
Storing the Lifter
Use the covers supplied to keep the vacuum pads clean.
!!-CE-!! In accordance with CE Standard EN 13155, the lifter is designed to rest on relatively
horizontal surfaces without tipping over. To store the lifter in this way, set the lifter with the
pads facing downward on a clean, smooth, flat surface. Then lower the lift bar to a horizontal
orientation (see OPERATION: TO TILT THE LOAD) and place a support under the lift spool.
However, see the Note immediately following.
Note: Storing the lifter with its pad frame and lift bar in the horizontal orientation could damage
the tilt actuator, if the lift bar is not supported. Avoid placing the lifter in this position; or if this is
unavoidable, place a support under the lift bar. Also be sure to provide manual assistance to the
tilt actuator when raising the lift bar to the vertical position (see ASSEMBLY).

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MAINTENANCE
WARNING: Make sure power cable is disconnected from power source before
servicing lifter.
Note: One or more wiring diagrams may be provided in the final section of this INSTRUCTIONS
manual for reference when servicing the lifter or trouble-shooting a deficiency.
INSPECTION SCHEDULE
Perform inspections routinely, according to the following frequency schedule:
Every-Lift Inspection
• Examine the vacuum pads and load surface for contamination or debris (see VACUUM PAD
MAINTENANCE to follow).
• Examine the vacuum pads, controls and indicators for visual damage (see VACUUM PAD
MAINTENANCE to follow).
If any deficiency is detected during the inspection, correct it before using the lifter and perform
the Frequent Inspection to follow.
Frequent Inspection
( following every 20-40 hours’ use; or whenever lifter is out of service for 1 month or more )
• Examine the lifter’s structure for visual damage.
• Examine the vacuum system (including vacuum pads, fittings and hoses) for visual damage.
• Examine the air filter for conditions requiring service (see AIR FILTER MAINTENANCE to follow).
• Perform the VACUUM TEST to follow.
• Check for unusual vibrations or noises while operating the lifter.
If any deficiency is detected during the inspection, correct it before using the lifter and perform
the Periodic Inspection to follow.
Periodic Inspection
( following every 250-500 hours’ use; or whenever lifter is out of service for 1 year or more )
• Examine the entire lifter for external evidence of looseness, excessive wear, deformation,
cracks, excessive corrosion, dents to structural or functional components, cuts, or any
deficiency which might constitute a hazard.
• Inspect all parts of the electrical system for damage, wear or contamination that could
constitute a hazard, in compliance with all local codes and regulatory standards that are
relevant for the geographical region.
CAUTION: Be sure to use appropriate cleaning methods for each type of electrical
component, as specified by codes and standards. Improper cleaning
can damage components.
• Keep a written record of all Periodic Inspections.
If any deficiency is detected during the inspection, correct it before using the lifter. If necessary,
return the lifter to Wood’s Powr-Grip or an authorized dealer for repair (see LIMITED
WARRANTY).

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Infrequent Use
If a lifter is used less than 1 day in a 2-week period, perform the Periodic Inspection each time
before using the lifter .
TESTING SCHEDULE
Perform these tests when placing the lifter in service initially and each time following a repair or
modification . Correct any deficiency and retest before using the lifter.
Operational Tests
• Perform the VACUUM TEST to follow.
• Test all features and functions of the lifter (see OPERATING FEATURES, OPERATION and
MAINTENANCE).
Load Test
Prove that the lifter can lift 100% of its Maximum Load Capacity (see SPECIFICATIONS), using an
actual load or an equivalent simulation.7Employ the following method to test with an actual load:
1) Place a test load with appropriate LOAD CHARACTERISTICS (see INTENDED USE) on a stable
support. Make sure the load is oriented in the upright position.8
2) Apply the vacuum pads to the load as previously directed.
3) When the vacuum level registers above 16" Hg [-54 kPa] on the vacuum gauge, place the
power switch in the “off” position ( ).
4) Raise the load a minimal distance, to assure that it is supported by the lifter.
5) Hold the load for 5 minutes. The load must not slip or fall during this time period. If it does,
conduct a VACUUM TEST and inspect each vacuum pad as indicated under VACUUM PAD
MAINTENANCE: Inspection (see sections to follow). Correct any deficiency that is found and
retest the lifter.
Note: See MAINTENANCE topics to follow for additional directions about inspecting and testing
specific lifter components.
MAINTENANCE SCHEDULE
Unless specified elsewhere in this INSTRUCTIONS manual, the lifter does not require
maintenance on a routine basis. Instead, maintenance must be performed whenever a deficiency
is indicated by routine inspections or tests. Any maintenance warranted must be performed
before resuming normal operation of the lifter.
7ASME Standard B30.20 requires the lifter to be tested to 125% of its Load Capacity.
8Flat Lifters are exempt from this requirement.

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VACUUM PAD MAINTENANCE
Friction Coefficient
The friction coefficient represents the lifter's ability to resist load slippage when the load is
oriented in any position except horizontal. If the contact surfaces of either the load or the
vacuum pads are not clean, dry and in good condition, slippage is more likely to occur.
The Load Capacity of most Powr-Grip lifters is based on a friction coefficient of 1 (only Flat Lifters
are exempt from this requirement). However, a vacuum pad's ability to maintain this friction
coefficient is reduced by factors such as contamination, wear, age and exposure to sunlight, as
well as the condition of the load's contact surface (see INTENDED USE: LOAD CHARACTERISTICS).
Pads that have surface contamination must be thoroughly cleaned (see Cleaning discussion to
follow). Over time, the rubber in a pad may experience hardening or leaching of chemicals,
resulting in stiffness or surface glaze. Pads that exhibit wear, stiffness or glaze must be replaced.
In addition, all pads should be replaced on a regular basis, preferably after no more than 2 years,
to ensure that the friction coefficient is not compromised. If necessary, contact your dealer or
Wood's Powr-Grip for more information.
Inspection
Inspect each vacuum pad for the following deficiencies routinely, as directed in the preceding
INSPECTION and TESTING SCHEDULES. Correct any deficiency before using the lifter.
• Contaminates on the pad face or sealing edges: Soil build-up can prevent pads from sealing
adequately or reduce the friction coefficient (see discussion preceding). Follow the directions
to clean pads as necessary (see discussion to follow).
• Filter screen missing from pad face: This screen helps prevent debris from plugging the vacuum
hose and the air filter. Replace any missing screen immediately (see REPLACEMENT PARTS
LIST).
• Nicks, cuts or abrasions in sealing edges: Pad damage can reduce the lifting capacity of the
lifter. Replace any damaged pad immediately (see REPLACEMENT PARTS LIST).9
WARNING: Replace vacuum pad if sealing edge has any nicks, cuts or abrasions.
• Wear, stiffness or glaze: See Friction Coefficient preceding. Replace any pad that exhibits wear,
stiffness or glaze (see REPLACEMENT PARTS LIST).
9If the lifter is equipped with VPFS10T or VPFS625 pads, the sealing edge is the replaceable sealing ring. When it is damaged,
install a new sealing ring insert. In such cases, see TO REPLACE SEALING RING INSERT IN VACUUM PAD to follow.