Gray WPLS Security Transceiver User Manual WPLS 160 67090347 RevJ

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OWNER’S MANUAL
WPLS-160
Wireless Portable Lift System
Important Safety Instructions
READ THIS MANUAL CAREFULLY
AND RETAIN FOR YOUR RECORDS
US Patent #6,634,461 & #7,014,012
Canadian Patent Pending
Table of Contents
Signal Words ..................................................................................................................................ii
Receiving Inspection...................................................................................................................... 1
Introduction .................................................................................................................................... 1
Owner and / or Operator Responsibilities............................................................................................. 1
Specifications................................................................................................................................. 1
Component Identification ............................................................................................................... 2
Safety Instructions ......................................................................................................................... 3
Operating Instructions.................................................................................................................... 5
Using the WPLS Lift System to Raise a Vehicle................................................................................... 5
Handle Operation................................................................................................................................. 8
Charging the Battery ............................................................................................................................ 8
Emergency Procedures........................................................................................................................ 9
Channel Selector Switch on Control Box............................................................................................ 10
Small Wheel Adapters........................................................................................................................ 12
Maintenance Instructions ............................................................................................................. 12
Annual Maintenance Requirements ................................................................................................... 12
Structural Inspection .......................................................................................................................... 13
Adding Hydraulic Fluid ....................................................................................................................... 13
Periodic Lubrication for Wear Pads .................................................................................................... 14
Bleeding Air From Cylinder ................................................................................................................ 14
Electrical Components ....................................................................................................................... 15
FCC Part 15 Statements for User's Manual……………………………………………………………16
Troubleshooting ........................................................................................................................... 17
Notes ........................................................................................................................................... 19
Foreword
Thank you for your purchase. With Gray products, you take part in a long history of products engineered for
the transportation service industry. Company founder J. H. Gray applied for his first automotive jack patent
in 1921, and since 1952 Gray has been producing the highest quality hydraulic and pneumatic equipment
available for the professional service technician. Our purpose is to provide you with quality equipment that
makes your job easier and with exemplary service after the sale. Please call Gray's customer service, at 1800-821-7320 or 816-233-6121, with any comments or questions.
Signal Words
Signal words call attention to a safety message or messages, or a property damage message
or messages, and designates a degree or level of hazard seriousness. The signal words are
“DANGER”, “WARNING”, “CAUTION”, and “NOTICE”.




ii
DANGER: Indicates a hazardous situation, which, if not avoided, will result in death or
serious injury. This signal word is to be limited to the most extreme situations.
WARNING: Indicates a hazardous situation, which, if not avoided, could result in death or
serious injury.
CAUTION: Indicates a hazardous situation, which, if not avoided, could result in minor or
moderate injury. It may be used to alert against unsafe practices.
NOTICE: Indicates a property damage message.
Receiving Inspection
Before attempting to operate these lifts, thoroughly read and understand this manual. Completely remove all tape and
packaging. Inspect each lift immediately upon delivery. If shipping damage is evident, inform the delivering carrier
immediately and contact customer service at the numbers and address printed on the back cover of this manual.
Introduction
Owner and / or Operator Responsibilities
The owner and / or user must have an understanding of the manufacturer’s operating instructions and warnings before
using these lifts. Personnel involved in the use and operation of equipment shall be careful, competent, trained, and
qualified in the safe operation of the equipment and its proper use when servicing motor vehicles and their components.
Warning information should be emphasized and understood.
The owner / manager must make this manual available to all personnel using these lifts at your direction. They must
read and understand the contents of this manual. If the operator is illiterate or is not fluent in English, the
manufacturer’s instructions and warnings shall be read to and discussed with the operator in a language the operator
understands by the purchaser / owner, making sure that the operator comprehends its contents and observes the proper
procedures for use of these lifts.
Owner and / or user must study and maintain for future reference the manufacturer’s instructions. Review the video to
familiarize yourself with the features and benefits of Gray’s “Wireless” Portable Lifting System. Owner and / or user
are responsible for keeping all warning labels and instruction manuals legible and intact. Replacement labels and
literature are available from the manufacturer.
Specifications
Max. Capacity per Unit
16,000 lbs (8 Tons)
7,258 kg.
Max. Capacity per set of 4
64,000 lbs (32 Tons)
29,030 kg.
Max. Capacity per set of 6
96,000 lbs (48 Tons)
43,545 kg.
Min. Wheel Diameter (w/adapter)
14”
356 mm
Maximum Wheel Diameter
24.5”
622 mm
Maximum Lift Height
67”
1,702 mm
Lift Speeds (varies with load)
50”/minute
1,270 mm/minute
Weight per Column
Height
1,360 lbs.
617 kg.
93”
2,362 mm
148”
3,759 mm
Width
43”
1,092 mm
Length
58”
1,473 mm
Turning Radius
48”
1,219 mm
Operating Voltage
12 VDC nominal
Operating Peak Power
4 Hp
Charger Voltage Required
120 VAC @ 60 Hz
Charger Amperage Required
1.1 Amps
Height at full lift
3.0 KWatts
Component Identification
Main On/Off Switch
Frame Base
Handle Assembly
On-Board Charger
Lift
Carriage
Power Unit
Down Stop Assembly
Battery &
Battery Case
Major Components And Cover Locations
Down Stop
Assemblies
Left
Cover
Latch
Right
Cover
Latch
Battery Case
and Battery
Handle
Grip
Linear
Sensor
Detent
Bar
Front
Cover
Open
Safety Instructions
WARNING
To avoid serious injury or death, read this manual carefully before operating this unit. Call customer
service at the numbers and address printed on the back cover of this manual if you have any questions.
Failure to understand and obey safety instructions may result in unsafe or improper use of this
product.
1. Use the Wireless Portable Lift System only on hard, level surfaces. Lifting on other than hard
surfaces with a slope of more than 3 degrees (5% grade) can result in lift instability and
possible loss of load.
2. DO NOT raise / lower one side of a vehicle.
3. DO NOT use the Wireless Portable Lift System to raise a vehicle by the frame or structural
member. Only use the wheels of the vehicle to lift with the lift system.
4. DO NOT raise one end of a vehicle if the opposite end is supported by stands.
5. DO NOT use the Wireless Portable Lift System in conjunction with any other equipment used
to raise a vehicle.
6. Lift only on same axle. Product is to be used only in sets of 2, 4 or 6 units, not as a single unit.
7. DO NOT place feet or any part of body between lift frame base and carriage. Personnel injury
can occur.
8. DO NOT place hands, other parts of body, or clothing between carriage slide pads and the
upright rails the carriage slides on vertically. These are potential pinch points that can injury
hands and fingers or possible grab clothing that can cause personal injury.
9. DO NOT use blocks, non-factory supplied adapters or cribbing devices with this lift.
10. Maximum capacity is listed on the ID decal. Do not use the lift as a stand to support more than
maximum capacity. DO NOT overload.
11. DO NOT use the Wireless Portable Lift System as a wheel dolly for the removal of tires.
12. No alterations shall be made to this product.
13. NEVER stand under the load or vehicle when it is being lifted or lowered.
14. NEVER stand either in or on the vehicle when it is being lifted or lowered.
15. DO NOT use the hoisting equipment to reach a lifted vehicle or to reach any part of the
vehicle.
16. Keep both the material and the surrounding area clean.
17. Before lowering a raised vehicle make sure there are no obstructions under the vehicle and the
lift carriages of the Wireless Portable Lift System.
18. Always keep the covers closed on the lifts.
19. DO NOT attempt to move the load horizontally when the vehicle is raised on the Wireless
Portable Lift System by any means.
20. Whenever the lifted vehicle is propped up and the lifting units are removed, use only the stands
intended for this purpose.
21. It is recommended that proper stands be used when the vehicle will be left in the raised
position for extended periods of time.
22. Do not use lifts outdoors when wind speeds exceed 20 mph.
23. NEVER start the vehicle motor when the vehicle is supported by the lifts or stands. Only start
engine when vehicle is standing on the ground.
24. Make sure there is adequate clearance above highest point of vehicle before lifting. Lift raises
67”.
25. NEVER use the battery and/or charger for any other purpose. NEVER use an unapproved
power source other than the battery to power the lift.
26. DO NOT expose the charger to rain or snow.
27. To reduce risk of damage to electric plug and cord, pull by plug rather than cord when
disconnecting charger.
28. NEVER smoke or allow an open spark or flame in the vicinity of the battery.
29. Make sure cord is located so that it cannot be stepped on, tripped over, or otherwise subjected
to damage or stress.
30. Use of an attachment not recommended or sold by the battery charger manufacturer may result
in a risk of fire, electrical shock or injury to persons.
31. DO NOT operate the charger if it has received a sharp blow, been dropped, or otherwise
damaged in any way. Call the 800 customer service number on last page of manual.
32. DO NOT disassemble the charger. If it is in need of repair call the 800 customer service
number on the last page of manual.
33. To reduce risk of electrical shock, unplug the charger from an outlet before attempting any
maintenance or cleaning.
34. NEVER charge a frozen battery.
35. Be extra cautious to reduce the risk of dropping a metal tool onto the battery. It might spark or
short- circuit battery or other electrical part that may cause an explosion.
36. Have plenty of fresh water & soap nearby in case battery acid contacts skin, clothing, or eyes.
37. Wear complete eye protection and clothing protection. Avoid touching eyes while working
near battery.
38. If battery acid contacts skin or clothing, wash immediately with soap and water. If acid enters
an eye, immediately flood with cold running water for at least 10 minutes and get medical
attention.
Failure to understand and obey these warnings may result in personal injury and / or property damage.
SAVE THESE INSTRUCTIONS!
Operating Instructions
Using the WPLS Lift System to Raise a Vehicle
This section discusses the appropriate and safe methods for using the WPLS Wireless Portable Lift System to raise
and lower a vehicle.
WARNING
Using the WPLS Lift System to raise a vehicle requires several steps that must be
followed each and every time the lift system is used:
1.
2.
3.
4.
5.
6.
7.
Inspect each lift for signs of wear or damage.
Transport the lifts to the work area.
Locate appropriate support stands, if needed.
Prepare the surrounding area before using the lift system.
Identify vehicle axles to lift, examine the tires, and prepare the vehicle.
Raise the vehicle.
Lower the vehicle to the Ground.
Each of these steps is discussed in detail in the following sections. Failure to follow
all of these instructions can lead to serious injury or death.
1. Inspect the Lift for Signs of Wear or Damage
Before each use, you should inspect the lift for any visible signs of wear or damage. See the “Structural
Inspection” section for details about how to inspect the lift. WARNING! If you see any signs of wear or damage,
or if there is any indication that the lift is not performing normally, immediately take it out of service and call
customer service at 800-821-7320 or 816-233-6121. NEVER use a lift that appears damaged in any way.
2. Transport the Lifts to the Work Area
Transport the lift to the work area by either (a) wheeling it or (b) lifting and transporting it using the provided
forklift pockets. The lift can be wheeled to the work area over smooth surfaces and short distances—transport the
lifts if traveling over longer distances and/or rough surfaces. WARNING! Jolting caused by the wheels catching
on uneven surfaces can cause physical strain and personal injury.
See the “Handle Operation” section for details on how to properly maneuver the lift unit.
3. Locate Appropriate Support Stands, if needed
Gray Manufacturing Company, Inc. recommends the use of appropriate support stands when the vehicle to be
lifted is to be left elevated for an extended amount of time. Gray Manufacturing Company, Inc. manufactures
support stands that are made specifically for high rise supporting.
4. Prepare the Surrounding Area Before Using the Lift System
It is important that the surrounding area be prepared properly before raising a load.
WARNING! Failure to follow all of these instructions can result in lift instability and loss of a load:
a. Use the lift only on hard, level surfaces capable of safely supporting the load. A level surface is
considered to be 3 degree slope (5% grade) or less.
b. The base of each lift unit must have its footprint is in full contact with the floor.
c. NEVER attempt to lift from an uneven surface where a lift unit could shift under load such a raised
seam in a concrete floor.
d. Clear the surrounding area of personnel, tools, equipment and other material.
If these conditions cannot be met, move the vehicle and lift system to an area where it can be lifted safely.
5. Identify the Vehicle Axles to Lift, Examine the Tires, and Prepare the Vehicle
It is important that the vehicle be in proper condition before raising it off the floor.
a. Always position a pair of lift units on opposite tires of the same axle. The steering wheels should be
pointing straight ahead. The vehicle's rims should be at least 19 ½” inches in diameter. For rims of
14-19 inches in diameter, refer to the “Small Wheel Adapters” section.
b. Check that the tires on the vehicle are properly inflated, in road worthy condition, and
the weight on any tire does not exceed the rated capacity of any lift unit. Be sure to consider the
weight carried by unsupported axles (i.e. set of four lifting a tandem axle vehicle).
c. Release the vehicle's parking or air brake and place the transmission in neutral.
d. Ensure each lift unit is properly charged and the Battery Charger Indicator Light is Green before use.
e. Position the Lift Units so the lift pads on the Carriage are cradling the tires evenly and parallel with
the hub. Push the lift pads under the tire until the Carriage cross tube contacts the tire. Release and
stow handle assembly to be sure rear pivot wheels are off the ground.
f. Turn Selector switch on the Control Box at first lift unit to SYNC position. Use Raise/Lower rocker
switch to select number of lifts to synchronize. Push the "Hold to RunTM" button to confirm selection
before moving to the next lift. See Figure 1.
g. Turn on remaining lift units one-at-a-time by moving each Selector switch to SYNC and each unit
should identify themselves with Unit # on the first display line. When all are in SYNC, a "Ready to
Operate" should be displayed on the second line and the Status Indicator light will be solid green.
STATUS
INDICATOR
Light
Display
RAISE/LOWER
Switch
SELECTOR
Switch
“HOLD to RUNTM"
Button
EMERGENCY
STOP
Button
Figure 1
6. Raise the Vehicle
a. Position yourself at any one of the synchronized Lift Units. Be aware of any overhead obstruction
above the vehicle. Lift Units can raise the vehicle 67" from the floor. While operating, keep a safe
minimum distance at all times between the vehicle and all overhead obstructions in order to prevent
damage to the vehicle, the Lift System, and/or the building structure.
b. When ready to lift, push and hold the "Hold-to-RunTM" button while moving the rocker switch to
Raise position. See Figure 1. As Carriages raise vehicle, the Status Indicator will flash green. This
will be normal.
c. Release both the "Hold-to-RunTM" button and the rocker switch when at the desired height.
d. While working on the Vehicle, move the selector switch on each Lift Unit to the "Lock" position.
This will inhibit unauthorized use of the lift system. The use of stands is recommended during
extended periods of time with the vehicle being elevated.
WARNING
One Control Box Selector switch must be turned to LOCK when left unattended in a raised position or
each turned to OFF when left unattended in the fully lowered position for an extended amount of time.
Failure to do so could result in serious injury and/or property damage.
7. Lowering the Vehicle to the Ground
WARNING! To avoid serious injury or death, NEVER drive the vehicle off the lifts or attempt to move a vehicle that
is elevated by the lift system.
a. Clear the work area under the vehicle of all personnel, tools, and shop equipment.
b. Position yourself at any one of the synchronized Lift Units. Be aware of any obstructions underneath
the vehicle.
c. If the system was set to the ‘Lock’ position, turn the Selector switch back to the ‘Sync” position and
press the “Hold-to-Run” button on each lift to reset the system.
d. When ready to lower, push and hold the "Hold-to-RunTM" button while moving the rocker switch to
Lower. Be aware that the Lift Unit(s) may rise slightly before lowering to ensure all Down Stop
Assembles are retracted.
e. Release both the "Hold-to-RunTM" button and the rocker switch when the vehicle is lowered to the
floor and the lift carriage has cleared contact with the tires. Green Status Indicator should become
solid when all Carriages have reached stowed position.
CAUTION
Do not turn the synchronized Lift Units "OFF" until vehicle is completely down, Carriage Arms
have disengaged from the tires, and the Carriages are completely stowed.
f. Place the transmission in gear (or park) and engage the brakes.
g. Move the Lift Units away from the work area and recharge each Lift Unit after use.
NOTICE
When storing Lift Units, make sure that the Control Box selector switch is in the "OFF" position and
plug in the charger.
Handle Operation
The handle should be stored in the upright position when not moving the lift unit. To move the unit for positioning,
lift up on detent bar while holding handle grips. Pull on handle and press down to raise lift while engaging the rear
wheels with ground. There are two positions to lift the unit from the floor. Release the detent bar to engage the stop
for the height desired. The handle height when engaged to the stop is at approximately 39” or 36” above the ground.
When the handle is engaged in one of these two positions, the unit can be maneuvered by rolling to the vehicle wheel
to be cradled prior to set up on the Wireless Portable Lift System. When the lift unit is in place, push down on the
handle and raise the detent bar to disengage the stop. While holding both handles, slowly let the handle rise to clear
the wheels from the ground. Do not let the handle go after it is disengaged from the stop, possible personal injury
could occur. Lift the handle to store it in the upright position. Release the detent bar to engage the up stop. Never
leave the handle engaged with the wheels loaded on the ground, possible damage could occur to the handle assembly.
The large rear wheels should always be clear of the ground prior to lifting the vehicle.
Charging the Battery
The on-board Charging unit is located behind the Left Cover. See Figure 2. Inspect the condition of the cord and
plug and only use if in good condition. Unwind the power cord and insert the plug into a suitable 120 VAC 60 Hz
power source with matching plug style. Each charger should draw less than 2 Amps apiece so a 20 Amp circuit
breaker should easily be able to handle six units charging simultaneously on the same circuit branch. The factory
equipped battery is an AGM type and normally will not ‘gas’ when charging exclusively with the factory installed
charger.
NOTICE
An Operator’s Manual from the charger manufacturer has been included in the information packet for
this lift system. Read operating and safety manuals before using charger.
Save these supplemental instructions!
WARNING
There are no serviceable items inside on-board Charger.
If the lift cannot be moved to a power outlet within reach of the 6 foot charger cord, a suitable extension cord can be
used. See Table 1 below for proper selection. Always use a grounded cord set with matching plug styles. Beware of
additional hazards associated with stringing extension cords on the floor such as tripping, crushing, electrocution
hazards as well as others.
Minimum Extension Cord Size
Length (ft.)
25 50 100
Wire Size (AWG) 16 14 12
Charger Rating: 120 VAC @ 60 Hz
1.1 Amps
On-Board
Charger
Table 1
WARNING
Do not use the battery or charger as an energy source
for any other purpose.
Figure 2
Emergency Procedures
In the event that the system must be stopped immediately, the WPLS system has provided an Emergency Stop button
on each Control Box. It is red in color and simply needs to be pushed in on any Control Box to halt a vehicle lift that
may be in progress. The normal emergency stop condition, or “E-Stop” message on the display, will communicate
with all controls synchronized in the system to halt all at once. After the situation is assessed, and it is determined that
it is safe to continue lifting or lowering, the emergency Stop button originally pushed in can be pulled back out and the
Hold-to-Run button pushed to reset the system. See Figure 1.
In the unlikely event that the system would lose communication at the same time an Emergency Stop button is pressed
and a lift is still moving, simply press the Emergency Stop button on the unit still moving. If this fails to stop the unit,
open the left cover and turn the Master Switch to OFF. See Figure 2.
Anytime the controls are found not to be functioning while a vehicle is already raised, the vehicle may be lowered to
the ground with the controls turned OFF using the following steps. Open the right hand cover by opening the LH latch
first, then the RH latch.
1. Turn all Control Boxes to the OFF position. See Figure 1.
2. Station a person at each lift with all right side covers open.
3. Each person must one at a time hold the Emergency Override Toggle down. See Figure 3. No motion should
occur yet. If there is, release all Override Toggles, then verify all Needle Valves are closed (CW).
4. Each person slowly opens the Needle Valve located on Power Unit to begin decent while holding Toggle down.
See Figure 4.
5. Coordinate level Lowering by adjusting the Needle Valve: Counterclockwise is FASTER, Clockwise is
SLOWER. Be sure to close all Needle Valves prior to next use.
If one or more unit(s) do not move down initially, it may be resting on a Down Stop slot. Close the Needle Valve and
slightly raise the carriage to clear the Down Stops. This is done by pushing in the Emergency Raise Push Button and
lifting up on the Emergency override Toggle together. Then resume lowering.
Needle Valve
Emergency Raise
Push Button
Emergency
Override Toggle
Fill Cap
Figure 3
Figure 4
Channel Selector Switch on Control Box
Four Channel Selector Toggle switches are provided on each Control Box in order allow the Operator a choice over
which frequency Channel the system is being set up on. There are 16 channels available which enables multiple
systems to work side-by-side within a facility but on different channels. This also enables a system that senses multiple
“Signal Loss” faults to conveniently move to another Channel for clearer communications. Use the following
guidelines to properly use this feature.
WARNING
Turn control box selector switch to OFF position before changing Channel Selector Toggle positions.
Failure to do so will prevent change from properly taking place and communication problems will exist.
1. Ensure all lifts are lowered and in stowed position.
2. Open Right Hand cover where the Control Box is located.
3. Ensure the Control Box Selector switch is in the OFF position.
4. Move any Toggle switch to a new position. See Figure 5. Reference Table 2 for Channel Selector Toggle
patterns. A Toggle pointing away from the Operator is considered ON; pointing towards the Operator is OFF.
5. Turn the Control Box Selector switch to SYNC position and proceed with the startup procedure.
6. Repeat for each additional Lift Unit to complete the Lift System. Be sure that the Toggle Switch pattern is
identical for each Lift Unit.
WARNING
Turn control box selector switch to the OFF position after each use. Failure to do so could result in
serious injury and/or property damage.
When using the WPLS-160 units in multiple systems to raise more than one vehicle, it is a good safety practice to turn
each control box off before moving the units under another vehicle. Since these systems can be configured in sets of 2,
4, or 6 units it is important to ensure the system knows exactly how many units are intended to be synchronized
together. When using these units to lift multiple vehicles, never use the same channel in the same location. Always use
separate channels when lifting separate vehicles.
WARNING
Do not attempt to lift more than one vehicle with one system. Do not attempt to lift one vehicle with
units synchronized into two or more different systems. Always synchronize one system per vehicle.
The WPLS-160 wireless feature complies with part 90 of the FCC Rules. The operation of these are registration-free
and there are no licensing requirements for the end user.
The controls on these Lift Units are equipped with a "SLEEP" mode. If the display back lighting is off while in the
SYNC or LOCK mode, push the "Hold-to-Run TM" button to brighten control display. This feature does not interfere
with the system’s operation.
WARNING
There are no serviceable items inside Control Box.
10
Channel Selector Toggles
Serial Number
Location
Display
SELECTOR
Switch
Figure 5
Table 2: Channel Selector Switch Chart
RF
TOGGLE POSITION
Channel
ON
ON
ON
ON
OFF
ON
ON
ON
ON
OFF
ON
ON
OFF
OFF
ON
ON
ON
ON
OFF
ON
OFF
ON
OFF
ON
ON
OFF
OFF
ON
OFF
OFF
OFF
ON
ON
ON
ON
OFF
10
OFF
ON
ON
OFF
11
ON
OFF
ON
OFF
12
OFF
OFF
ON
OFF
13
ON
ON
OFF
OFF
14
OFF
ON
OFF
OFF
15
ON
OFF
OFF
OFF
16
OFF
OFF
OFF
OFF
11
Small Wheel Adapters
WARNING
The small wheel adapters should be used for wheel from 14” to 19” only. DO NOT overload when
using this adapter. Failure to heed this warning may result in personal injury and/or property damage.
The optional wheel adapters are located on each side of the carriage, see Figure 6. Secure adapters by inserting
hooks into top row of grip holes and then resting them on the carriage arm in the working position. See Figure 7.
When lifting a vehicle with 14” to 16” wheels, use both of the wheel adapters. If you are lifting a vehicle with 17”
to 19” wheels, use only one of the wheel adapters. Remember to release the emergency brake and put the vehicle in
neutral prior to lifting.
Insert Hook
Into Holes
Stored
Location
Working
Position
Figure 6
Figure 7
Maintenance Instructions
WARNING
All inspection and maintenance procedures must be performed after the lift system has been removed
from service. Failure to heed this warning may result in personal and / or property damage.
NOTICE
The owner must inspect, or appoint a knowledgeable person to inspect the lifts. Visual inspection
should be made before each use of lifts, checking for abnormal conditions. Regular inspections should
be made weekly for daily use and monthly for intermittent use. Each lift must be inspected immediately
if subjected to an abnormal load or shock. Any lift which appears to be damaged in any way, is found to
be badly worn, or operates abnormally shall be removed from service until necessary repairs are made.
Annual Maintenance Requirements
1. Check oil level in the oil reservoir. Refer to the “Adding Hydraulic Fluid” section.
2. All warning and capacity labels should be readable and complete. Wash external surfaces of lift, labels, and
decals with a mild soap solution.
3. Lubricate rails of the lift that slide pads slide on with a dry film PTFE type lubricant as needed if
chatter/vibration develops. Refer to the “Periodic Lubrication for Wear Pads” section.
4. Inspect Battery Terminals connections to make sure they are clean and residue free.
12
Structural Inspection
WARNING
The lift must be removed from service and inspected for damage immediately if the lift is subjected to
an abnormal shock or load. Failure to heed this warning may result in personal and/or property damage.
NOTICE
The owner must inspect, or appoint a knowledgeable person to inspect the lift for signs of corrosion and
/ or excessive wear. Visual inspection should be made before each use of lift, checking for abnormal
conditions. Regular inspections should be made weekly for daily use and monthly for intermittent use.
Each lift must be inspected immediately if subjected to an abnormal load or shock. Any lift which
appears to be damaged in any way, is found to be badly worn, or operates abnormally shall be removed
from service until necessary repairs are made.
1. Inspect lifts regularly and remove from service if it is cracked, chipped or shows signs of excessive wear.
2. The lifts should raise and lower smoothly through its full range. Inspect the lift frame rails for damage such as
gouging. If lift stutters when lowering (jerky) the rails may need to be re-lubricated. Refer to the “Periodic
Lubrication for Wear Pads” section.
3. All controls should operate freely. Inspect for oil leaks. If oil leaks occur, investigate and correct the source of
the leakage. Then refer to the “Adding Hydraulic Fluid” section of this manual.
4. Check that all Grade #8 fasteners are tight and properly wire-tied together.
CAUTION
Clean up any oil leakage immediately. Oil left on a floor can be a slipping hazard.
If any irregularities or problems are detected during an inspection, the lifts must be removed from service immediately
and repaired. Contact customer service at the numbers printed on the back of this manual.
Adding Hydraulic Fluid
The hydraulic reservior is located on the Power Unit mounted directly below the Control Box.
1. Remove the lift unit from service.
2. The carriage must be in the fully lowered position and the lift unit must be on a level surface.
3. Open the right hand cover by releasing the LH Latch first, then the RH Latch.
4. Clean around the surface of the oil fill plug to prevent contamination of the hydraulic oil system.
5. Remove the oil fill plug. See Figure 4. Visually check the hydraulic oil level. The fluid should be visible and
just covering the dipstick. If the fluid level is low, add a high-grade hydraulic fluid equivalent to Tellus T22 so
the oil level just covers the dipstick. Allow at least a 1” air gap for fluid expansion.
CAUTION
Do not use brake or transmission fluid. Use of the wrong fluid can deteriorate the seals and corrosion
problems will occur.
6. Re-install the oil fill plug. Clean up any spilled oil and secure the right hand cover back onto the frame. Test
the lift for normal operation.
If the carriage doesn’t rise to full height before pump cavitates, check for air in the system. See “Bleeding Air from
Cylinder.” If this doesn’t solve the problem, call customer service at the numbers printed on the back of this manual.
13
Periodic Lubrication for Wear Pads
The WPLS is designed with pre-lubricated Wear Pads to transfer the load from the moving Carriage to the stationary Column.
This design will provide a long service life before any replacement is needed.
In addition, all 2005 units and later, have the Column Rails prepared with an extreme pressure coating at the factory instead of the
standard paint. This coating is made with a Moly Disulfite compound and eliminates the possibility of paint flaking. During the
production of the WPLS lift, a dry film lubricant is sprayed on the Rails and used to assist the Wear Pads during their ‘break-in’
period. This lubricant is a PTFE based product that sprays on dry and stays dry. A dry film lubricant will not attract dirt or other
air born particles that could be harmful to the Wear Pads.
During everyday use, the WPLS may require periodic re-lubrication to continue smooth operation. A chatter noise or vibration
sound may indicate the need to re-lubricate with the following list of Recommended Dry Film Lubricants. Do not use Silicon or
Graphite based products! In some environments, this re-lubrication could occur even monthly. If further assistance is needed,
call Gray Customer Service for further instructions.
The following products have been used with success:
Recommended Dry Film Lubricants*
Source
P/N
Description
Grainger
Gunk
Sherwin-Williams
4KK82
L512
S00311
LPS® Dry Film PTFE (12 oz. aerosol)
Liquid Wrench® Dry Lubricant (11 oz. aerosol)
Sprayon™ Dry Film P.T.F.E. (12 oz. aerosol)
*not intended to be an all-inclusive list.
Lubrication Instructions
1. With Carriage stowed, wipe down three sides of each Rail (Front, Back, and Side) with a clean, dry cloth or towel.
2. Spray three sides of each Column Rail with a thin even coat of PTFE from the recommended list. See Figure 1.
3. Raise Carriage 2 to 3 feet and repeat for lower portion of each Column.. Lower Carriage to stowed position
Column
Rail
Wear Pad
Carriage
Figure 1
Bleeding Air From Cylinder
If Carriage is spongy or jumpy when either raising or lowering with no load on the carriage, there is most likely air
trapped in the cylinder. In order to remove the trapped air do the following:
1. Turn the control box to the OFF position.
2. Open the right hand side cover by releasing the LH Latch first, then the RH Latch.
3. Raise the carriage lift up by pushing the Emergency Override Toggle in the up direction and pushing in on the
Emergency Raise Push Button. See Figure 3. Raise the carriage approximately two feet off the ground.
4. Position a ladder behind the lift so you can reach the top of the cylinder. With a 3/16” allen wrench and a rag,
slightly open the vent screw in the top on the cylinder, see Figure 8, while surrounding the port with a clean
14
rag. You can hear the air escaping. This might take a little time depending on the amount of air trapped in the
cylinder.
5. When oil starts to escape past the vent screw, retighten the vent screw. The air will now be purged from the
system. Clean up any oil residue that escapes from the cylinder.
6. When you get down from the ladder, lower the carriage by following the “Emergency Lowering Procedure”.
7. To make sure that no additional air will get into the system, the oil level in the hydraulic reservior should be
checked to ensure the unit has a proper oil level in the reservior. To do this, follow the “Adding Hydraulic
Fluid” procedure listed in the owner’s manual.
Vent Screw
Figure 8
Electrical Components
The electrical system is powered by a 12 VDC battery capable of discharging up to 260 Amps to raise Rated Load.
This electrical system does not need any routine maintenance, but there are several circuit protectors to be aware of.
WARNING
Always disconnect the battery from the system before changing fuses. Failure to heed this warning may
result in personal and/or property damage.
A. Battery Charger is protected from a battery short circuit by a 30 Amp glass type in-line fuse located near the
battery terminals (See Figure 9, Item A).
B. DC Power Unit motor is protected by a 300 Amp ANL type fuse located inside Left Cover mounted to a block
with clear Plexiglas cover (See Figure 10, Item B).
C. Down Stop Assembly circuit is protected by a 15 Amp blade type which is located to the left of the fuse block
(See Figure 10, Item C). It will have a red colored lead wire.
D. Control Box is protected by a 7.5 Amp blade type in-line fuse which is located just under the Main On/Off
switch (See Figure 10, Item D).
E. Down Stop Limit Switch signal to Control Box is protected by a 3 Amp in-line fuse which is located to the left
of the fuse block (See Figure 10, Item E).
All Blade type fuses are clearly marked when opening protective caps.
NOTICE
Always replace fuse protective caps or covers after inspection of the fuse.
CAUTION
Always replace a blown fuse with the same size and type. An improper replacement could damage the
equipment.
15
A
Figure 9 (Battery Cover removed for clarity)
Figure 10
FCC PART 15 STATEMENTS FOR USER”S MANUAL
THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES. OPERATION IS SUBJECT TO THE
FOLLOWING TWO CONDITIONS.
(1) THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE, AND (2) THIS DEVICE MUST
ACCEPT ANY INTERFERENCE RECEIVED, INCLUDING INTERFERENCE THAT MAY CAUSE
UNDESIRED OPERATION.
Warning: Changes or modifications not expressly approved by the party responsible for
compliance could void the user’s authority to operate this equipment.
Note: This equipment has been tested and found to comply with the limits for a Class B
digital
device, pursuant to part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This
equipment
generates, uses and can radiate radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular installation. If
this equipment does cause harmful interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
—Reorient or relocate the receiving antenna.
—Increase the separation between the equipment and receiver.
—Connect the equipment into an outlet on a circuit different from that to which the
receiver is
connected.
—Consult the dealer or an experienced radio/TV technician for help.
16
Troubleshooting
This page is a list of preprogrammed faults and possible solutions. This list of faults is also listed on a label located on
the inside of the LH Cover. If the solution listed fails to correct the problem, call customer service at the numbers and
address printed on the back cover of this manual. Please have the model number, and serial number of your lift unit
available. The serial number is permanently stamped to the rear of the right base tube cover plate. The serial number
of the control box is on the right hand side panel. It can be seen without opening the right hand cover.
Control
Panel
Messages

“Recharge
Needed”



“Max. Allowed
Lift Height”



“Low Battery”
Possible Solutions*
Meaning


Energy Level on one or more Lift(s) has dropped below desired
minimum – please recharge before next lift.
Lift Unit(s) has flashing Red Status Indicator.
Further use without recharge could shorten battery life.

Plug in On-Board Charger.
Lift System has reached the maximum height allowed for the
present configuration of lifts.
All Lift Units have flashing Green Status Indicator.
Using only two Lift Units will raise 30” maximum.

Lift System may be lowered from this
height.
1.
Plug in on-board charger, if 110 VAC is
available.
If not available:
o Locate spare 12 VDC Battery.
o Locate supplied Jumper Cables.
o Turn all Controls to OFF position.
o Disconnect System Power Cable.
o Connect Jumper Cables to spare
battery terminals.
o Connect Jumper Cables to System
Power Cable.
o Re-synchronize system to continue.
Energy Level on one or more Lift Unit(s) has dropped to a
point where further lifting will damage Battery. However,
vehicle can be lowered.
Lift Unit(s) has flashing Red Status Indicator.
Identified Lift Unit(s) must be recharged (or swapped to spare
battery) before further lifting can take place.
2.
Note: If backup Battery is used to finish lift operation, properly
charge or replace Lift Unit Battery and reconnect to System Power
Cable.
1. Verify Lift Unit(s) control is in the
“Signal Loss”





“Feedback
Loop”


Communication from one or more Lift Unit(s) was lost.
Lift Unit(s) has flashing Red Status Indicator.
Can be caused by outside RF interferences and is considered
normal.
Communication link needs to be reestablished.
Carriage position on one or more Lift Unit(s) is not responding
properly to Control commands.
Lift Unit(s) has flashing Red Status Indicator.
Carriage speed does not match Control Box output.
2.
3.
SYNC position, then press “Hold-toRun” switch.
If not, select SYNC and verify height
position. Then, press “Hold-to-Run”
switch at each Control to reestablish
communication.
If “Signal Loss” continues to reoccur,
turn all Controls to OFF, select another
frequency several channels away, and resynchronize the system.
1. Press “Hold-to-Run” switch to continue.
2. If reoccurs, verify no obstructions with
3.
Lift Carriage.
If no obstructions, check operation of
Linear Sensor.
1. Press “Hold to Run” switch to clear

“Out-of-Sync”
“E-Stop”


Lift Units heights are not within acceptable synchronization
range.
All Lift Units have flashing Red Status Indicator.
All Lift Units must be within 3” of each other to operate.

Red Emergency Stop button has been pushed IN on one or
fault.
2. Operate Lift System in the opposite
direction temporarily to re-synchronize.
3. If unable to re-synchronize, use
Emergency Lowering Procedure and
re-sync at ground level.
1. Determine cause of activation.
17


more Lift Unit(s).
Lift Unit(s) has flashing Red Status Indicator.
All Red Emergency Stop buttons must be OUT to operate.
2. Rectify condition and verify ready to
operate.
3. Reset Emergency Stop Button and push
“Hold-to-Run” switch to continue.

“Too Many to
Lift, …”



1. Find all Lift Unit(s) not intended to be
Number of Lift Units in SYNC is more than the Operator
inputted during set up.
Last Lift Unit in SYNC has flashing Red Status Indicator.
Another System is already operating on that RF channel.
Number of Lift Units set to SYNC must equal the Number
inputted during set up.
used on current vehicle.
2. If other Units are being used on another
3.
vehicle, switch channels and resynchronize.
If other Units are to be idle, verify all
Controls are OFF before synchronizing
current system.
1. Push Hold-to-Run switch to clear fault

“Too Few to
Lift”



“Down Stop
Error”
18


Number of Lift Units in SYNC is less than the Operator
inputted during set up.
Operated Unit will have flashing Red Status Indicator.
Number of Lift Units set to SYNC must equal the Number
inputted during set up.
At least one Lift Unit has Stop Blocks not completely retracted
to allow lowering of vehicle.
Lift Unit(s) has flashing Red Status Indicator.
All Stop Blocks must be completely retracted before Lift
System will allow vehicle to Lower.
message.
2. Find all Lift Unit(s) that are intended to
3.
be used and verify the Controls are in the
SYNC position.
If all are in SYNC, turn all OFF and
restart. Ensure proper Number of lifts is
inputted when prompted.

Call Technical Service for assistance.
Notes
19
Gray Manufacturing Company, Inc.
3501 S. Leonard Road, P.O. Box 728
St. Joseph, Missouri 64502
Customer Service Hotline
800-821-7320 or 816-233-6121
Fax 816-233-7251
www.grayusa.com
EMAIL- gray@grayusa.com
Printed in U.S.A.
© 2006 Gray Manufacturing Compnay, Inc..
P.N. 0-670-90347 Rev. J
DN121708

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