Southworth Stack-N-Go FPS2500-90NAS User manual

June 24 2019
Stack-N-Go Owner’s Manual
FPS2500-90NAS
SOUTHWORTH PRODUCTS CORP.
P.O. Box 1380, Portland, ME 04104-1380
Telephone: [phone] • 207-878-0700
Fax: [phone]
www.SouthworthProducts.com
Model:
Serial Number: __________________________
Date placed in
service:
__________________________
For machines with frame numbers beginning with GC stamped into the mast.

2Southworth Products FPS2500-90NAS Manual
Contents
1 Introduction............................................................................................................. 4
1.1 Responsibilities of Owner and Users.................................................................................. 4
1.2 Responsibilities of Operators.............................................................................................. 5
2 Safety....................................................................................................................... 7
2.1 Safety Alert Symbols ............................................................................................................ 7
2.2 Signal Words ......................................................................................................................... 7
3 Labeling................................................................................................................. 10
3.1 Label Placement Diagram .................................................................................................. 10
4 Setup.......................................................................................................................11
4.1 Critical Procedure for Proper Wheel Traction ...................................................................11
4.2 Inspection ............................................................................................................................ 12
4.3 Removing From Pallet ........................................................................................................ 12
4.4 Preparation For Use............................................................................................................ 12
5 Operation............................................................................................................... 13
5.1 To Raise and Lower ............................................................................................................ 13
5.2 Travel Function.................................................................................................................... 13
5.3 Turtle Speed Travel ............................................................................................................. 13
5.4 Electric Brake ...................................................................................................................... 14
5.5 Reversing Safety................................................................................................................. 14
5.6 Horn...................................................................................................................................... 14
6 Maintenance & Repair.......................................................................................... 14
6.1 Battery Maintenance........................................................................................................... 15
6.2 Periodic Maintenance ......................................................................................................... 16
6.2.1 Weekly Maintenance................................................................................................... 16
6.2.2 Monthly Maintenance ................................................................................................. 16
6.3 Ordering Replacement Parts.............................................................................................. 17
7 Troubleshooting ................................................................................................... 18
8 Stacker Body Components.................................................................................. 19
9 Control Pod........................................................................................................... 20
9.1 August 2018 and Prior........................................................................................................ 20
9.2 September 2018 to Present................................................................................................ 21
10 Steering Assembly ............................................................................................. 22
10.1 August 2018 and Prior...................................................................................................... 22
10.2 September 2018 to Present.............................................................................................. 23

3Southworth Products FPS2500-90NAS Manual
This label (part # 10095524)
is required by California law.
For more information visit
www.65Warnings.ca.gov.
This label (part # 10095524)
is required by California law.
For more information visit
www.P65Warnings.ca.gov.
11 Drive Wheel Assembly ....................................................................................... 24
12 Carriage Assembly ............................................................................................. 25
13 Mast Assembly ................................................................................................... 26
14 Hydraulic System ............................................................................................... 27
15 Hydraulic Power Unit ......................................................................................... 28
16 Hydraulic Schematic .......................................................................................... 29
17 Control Panel ...................................................................................................... 30
18 Electrical Schematic........................................................................................... 31
18.1 Prior to November 2017.................................................................................................... 31
18.2 November 2017 to Present............................................................................................... 33
19 Battery Connection ............................................................................................ 35
20 Warranty & Contact Information ....................................................................... 36
21 Daily Operator Checklist.................................................................................... 37

4Southworth Products FPS2500-90NAS Manual
1. Introduction
This manual attempts to provide all of the information necessary for the safe and proper
installation, operation and maintenance of Southworth Products Inc. battery operated, Stack-
N-Go. It is important that all personnel involved with the installation, maintenance or operator
of the stacker read this manual. Additional manuals are available upon request or at www.
SouthworthProducts.com. Each Southworth stacker is equipped with nameplate, serial number
and model identications. Please refer to these numbers when ordering parts or requesting
further information. The Southworth stackers are designed for lifting, lowering and positioning a
wide variety of loads. WHERE UNIQUE SITUATIONS ARISE, WHICH ARE NOT COVERED IN
THIS MANUAL, CALL Southworth Products FOR FURTHER INSTRUCTIONS.
The battery operated stackers are designed for in-plant/non-hazardous locations only. They can
be used in a 8’ or larger aisle. These units are not for personnel lifting.
This machine is designed for powered travel and should not be
manually moved by applying force to the Control Pod Handles. The
Control Pod and steering arm should only be moved side to side when
the machine is under power. The Control Pod and steering arm should
be lowered to the drive position and power, Forward or Reverse, is
engaged by moving the thumb wheel in the direction of desired travel
then the steering arm can be moved side to side for directional steering.
Pushing or pulling on the Control Pod Handles when the unit is not
powered can lead to damage and/or breakage
1.1 Responsibilities of Owner and Users
Basic Principles - Owners/users shall apply sound principles of safety, training, inspection,
maintenance, and expected operating environment. It shall be the responsibility of the owner/user
to advise the manufacturer where deection may be critical to the application.
Manuals - Owners/users shall keep and maintain a copy of the operating and maintenance
manual(s) and ensure its availability to operating and maintenance personnel.
Inspection and Maintenance - It shall be the responsibility of the users to inspect and
maintain the machine as required to ensure proper operation. The frequency of inspection and
maintenance shall be based upon the manufacturer’s recommendations and be compatible with
operating conditions and the severity of the operating environment. Machinery that is not in proper
operating condition shall be immediately removed from service until repaired. Maintenance and
repairs shall be made by a qualied person and the repairs shall be in conformance with the
manufacturer’s recommendations.
Maintenance Safety Precautions - Before adjustments and repairs are started on the machine,
the following precautions shall be taken as applicable:
1. Remove the load from the load enclosure.
2. Lower platform to the full down position.
3. Relieve system pressure from all circuits before loosening or removing any components.
4. All controls in the “off’ position and all operating features secured from inadvertent motion
by brakes, blocks, or other means.
5. Disconnect power and follow established owner/user lockout/tag out policies.
6. Follow precautions and directions as specied by the manufacturer.

5Southworth Products FPS2500-90NAS Manual
Replacement Parts - When parts or components are replaced, they shall be replaced with parts
or components approved by the original manufacturer.
Maintenance Training - The user shall ensure only qualied personnel inspect and maintain the
machine in accordance with the manufacturers recommendations.
Operator Training - An owner/user, who directs or authorizes an individual to operate the
machine shall ensure that the individual has been:
1. Trained in accordance with the manufacturer’s operating manual.
2. Made aware of the responsibilities of operators as outlined in section 1.4 of this manual.
3. Retrained, if necessary, based on the owners/user’s observation and evaluation of the
operator.
Modications and additions shall not be performed without the manufacturer’s prior written
approval. Where such authorization is granted, capacity, operation, and maintenance instruction
plates, tags, or decals shall be changed accordingly.
1.2 Responsibilities of Operators
Basic Principles - Operators shall apply sound principles of safety and good judgment in
the application and operation of the machine with consideration given to its intended use
and expected operating environment. Since the operator is in direct control of the machine,
conformance with good safety practices is the responsibility of the operator. The operator shall
make decisions on the use and operation with due consideration for the fact that his or her own
safety as well as the safety of other personnel on or near the machine is dependent on those
decisions.
General Training - Only personnel who have received general instructions regarding the
inspection, application and operation of machine, including recognition and avoidance of hazards
associated with their operation, shall operate the machine. Such topics covered shall include, but
not necessarily be limited to, the following issues and requirements:
1. A pre-start inspection
2. Responsibilities associated with problems or malfunctions affecting the operation of the
machine.
3. Factors affecting stability
4. The purpose of placards and decals
5. Workplace inspection
6. Safety rules and regulations
7. Authorization to operate
8. Operator warnings and instructions
9. Actual operation of the machine. Under the direction of a qualied person, the trainee shall
operate the machine for a sufcient period of time to demonstrate prociency in actual
operation of the machine.
Pre-start Inspection - Before use each day or at the beginning of each shift, the machine shall be
given a visual inspection and functional test including but not limited to the following:
1. Operating and emergency controls
2. Safety devices
3. Hydraulic system leaks

6Southworth Products FPS2500-90NAS Manual
4. Electrical cables and wiring harness
5. Loose or missing parts
6. Nameplates, precautionary and instructional markings and/or labeling
7. Guarding system
8. Items specied by the manufacturer
Problem or Malfunctions - Any problems or malfunctions that affect the safety of operations shall
be repaired prior to the use of the machine.
Before Operations - The operator shall:
1. Read and understand the manufacturer’s operating instruction(s) and user’s safety rules or
have them explained
2. Understand all labels, warnings, and instructions displayed on the machine or have them
explained.
Workplace Inspections - Before the machine is used and during use, the operator shall check
the area in which the machine is to be used for possible hazards such as, but not limited to:
1. Bumps, oor obstructions and uneven surfaces
2. Overhead obstructions and electrical hazards
3. Presence of unauthorized persons
4. Other possible unsafe conditions as noted in the operating manual.
Operator Warnings and Instructions - The operator shall ensure the operation of the machine
is in compliance with the following:
1. Guarding system - Guarding shall be installed and positioned, and access gates or
openings shall be secured per the manufacturer’s instructions (If applicable).
2. Distribution of load - The load and its distribution on the platform shall be in accordance
with the manufacturer’s rated capacity for that specic conguration.
3. Maintaining overhead clearance - The operator shall ensure that adequate clearance is
maintained from overhead obstructions and energized electrical conductors and parts.
4. Point of Operation - The operator shall not place any part of their body under the platform.
5. Precaution for moving equipment - When other moving equipment or vehicles are
present, special precautions shall be taken to comply with the safety standards established
for the workplace.
6. Reporting problems or malfunctions - The operator shall immediately report to a
supervisor any problem(s) or malfunction(s) that become evident during operation. The
operator shall ensure all problems and malfunctions that affect the safety of operations are
repaired prior to continued use.
7. Capacity limitation - Rated capacity shall not be exceeded when loads are transferred to
the load enclosure.
8. Work area - The operator shall ensure the area surrounding the machine is clear of
personnel and equipment before lowering the load enclosure.
9. Securing the machine - The operator shall comply with the means and procedures
provided to protect against use by an unauthorized person(s).

7Southworth Products FPS2500-90NAS Manual
10.Altering safety devices - Safety devices shall not be altered or disabled.
11. Modications or alterations of the machine or the fabrication and attaching of frameworks
or the mounting of attachments to the machine or the guarding system shall only be
accomplished with prior written permission of the manufacturer.
12.Assistance to the operator - If an operator encounters any suspected malfunction or any
hazard or potentially unsafe condition relating to capacity, intended use or safe operation
the operator shall cease operation of the machine and request further instruction from the
owner/user.
13.Problems or malfunctions - Any problem(s) or malfunction(s) that affect the safety of
operations shall be repaired prior to the use of the machine.
2. Safety
All personnel installing, operating, and maintaining this machine shall read and understand this
manual. For questions or concerns contact the manufacturer.
All operators of this machine must be trained, by their employer, in accordance with OSHA
standard 1910.178 29QFR-7-1-06 before being permitted to operate this machine.
2.1 Safety Alert Symbols
A symbol that indicates a hazard. It is composed of an equilateral triangle surrounding an
exclamation mark. The safety alert symbol is only used on hazard alerting signs. It is not used on
safety notice and safety instructions signs.
A – For use with DANGER signal word; (safety white triangle, safety red exclamation mark, safety
red background)
B – For use with WARNING signal word; (safety black triangle, safety orange exclamation mark)
C – For use with CAUTION signal word; (safety black triangle, safety yellow exclamation mark)
D – For use with DANGER, WARNING, or CAUTION signal words; (D is a safety yellow triangle
with a safety black border and safety black exclamation mark;
2.2 Signal Words
DANGER Indicates a hazardous situation that, if not avoided, will result
in death or serious injury.
WARNING Indicates a hazardous situation that, if not avoided, could
result in death or serious injury.
CAUTION Indicates a hazardous situation that, if not avoided, could
result in minor or moderate injury.
NOTICE Indicates information considered important, but not hazard-
related (e.g., messages relating to property damage).
ABCD

8Southworth Products FPS2500-90NAS Manual
DO NOT OPERATE THESE LIFTS WITHOUT CAREFULLY READING THIS MANUAL. In order
to provide for the safe operation of these stackers, Southworth Products Inc. has identied certain
hazards that may occur during the maintenance and use of these lifts. For safety reasons these
units are designed to be serviced or repaired in the fully lowered position. If performed properly,
this will greatly reduce the possibility of injury.
When servicing the unit:
1. Key should be in “OFF” position.
2. E-stop should be depressed.
3. Disconnect the batteries at the terminals.
Do not perform any repair work on lifts if there is a load on the forks or
platform.
Do not perform any repair work if the forks or platform is in the raised
position.
All personnel must stand clear of the lift while in motion.
Do not put hands or feet under the forks or platform.
Do not stand underneath the forks or platform.
Do not stand in front of the stacker while in motion.
Do not stand, sit or climb on the lift.
Do not use the lift on soft, uneven or unstable surfaces.
Do not exceed the load center or capacity.

9Southworth Products FPS2500-90NAS Manual
To avoid death or serious injury:
• Always be alert to the area around you and watch where you are walking. Be careful
that you don’t get pinned or crushed between the stacker and a xed object such as
a wall or post.
• Watch your hands and feet. A foot or hand caught between the stacker and a xed
object will be crushed or even cut off.
• If traveling forks rst, keep both hands on the control handle and be careful when
changing direction of travel. Keep your feet clear of the stacker.
• Keep the stacker under control at all times. Operate at a speed that allows you to
stop safely. Be even more careful on slippery or uneven surfaces. Do not run over
objects on the oor.
• Perform all stacker movements smoothly and at a speed that will give you time to
react if an emergency occurs.
• Tip-overs and falls are very serious accidents; you can be crushed or even killed. To
prevent injury, know where you are at all times and follow the rules of safe stacker
operation.
• Be careful when working around docks, dock boards and trailers. Stay away from
the edge of docks and ramps. Check to make sure the wheels of truck or trailers are
chocked.
• Travel with the load or forks close to the ground. Watch for overhead obstructions.
Perform all stacker movements smoothly and at a speed that will give you time to
react in an emergency. DO NOT travel with forks or platform in an elevated position.
• Keep your hands and feet away from all moving parts such as masts, chains, forks or
wheels.
• Never stand on or under the forks, or allow anyone else to stand on or under them.
Never ride on the stacker or allow anyone else to ride.
• Before you leave your stacker, be sure to lower the forks to the oor. Shut the
stacker off with the key.
• DO NOT use this stacker until you have been trained and authorized to do so.
• DO NOT operate until you have read all warnings and instructions.
• DO NOT exceed load center or load weight capacities (check capacity plate).
• DO NOT operate until you have checked the conditions of the stacker: lift systems,
forks, chains, and cables.
• DO NOT use if any part is damaged, worn or not working properly.
• DO NOT use on ramps or inclines. Only smooth level surfaces.
• DO NOT use for lifting or carrying people.
• DO NOT handle unbalanced, unstable, loosely stacked, or loads that exceed the
rated capacity.
• DO NOT operate when parts of anyone’s body may be close to mast structure or any
moving parts.
• DO NOT drop loads on platform or forks.
• DO NOT alter or modify this stacker in any way.

10Southworth Products FPS2500-90NAS Manual
3. Labeling
This machine has labeling to indicate potential hazards this machine may pose when operating
and/or maintaining the machine. All labels must be legible. If any label is missing, damaged, or
otherwise illegible contact the manufacturer for replacement labels.
3.1 Label Placement Diagram
11
ITEM #
14
11
11 1
1 1 1 1 1 1
4 1
1 1
1 1

11Southworth Products FPS2500-90NAS Manual
4. Setup
4.1 Critical Procedure for Proper Wheel Traction
Proper Drive Wheel traction is obtained for the Stack-N-Go Straddle unit using this Procedure. All
Stack-N-Go Models are designed and intended to operate on an unnished concrete oor surface.
If any Stack-N-Go is operated on smooth or polished concrete, sealed concrete, epoxy sealed
oor, linoleum or other smooth surfaces Drive Wheel traction performance may be affected; If
traction issues are encountered Rubber Drive Wheels are available through special order. Please
contact Customer Service at Southworth Products 1-800-343-9322. When any Stack-N-Go is
operated on a wet, oily, powdery, sandy or non-uniform liquid or granular surface Drive Wheel
traction performance will be affected and loss of traction will occur.
Straddle legs must be adjusted and secured in accordance with these
procedures.
Setup procedure for straddle legs:
1. Stack-N-Go unit located on at, clean uniform surface, unloaded, forks raised a minimum of
1” off the oor.
2. Determine the desired/required straddle width dimension (2 inches greater than pallet
width, 1” on each side of the pallet or load, up to a maximum of 50 inches inside width)
3. Be sure to fully loosen all bolts before moving stabilizing legs. A 14mm allen wrench is
required for the bolts. Adjust one stabilizer leg at a time – using a pry bar, pinch bar, rubber
mallet etc. move the straddle leg out from the base tube to the desired position. Do not
move too far, see picture below, if the ¼” wide painted White Line is visible the leg is pulled
out too far; Maximum movement 5 ½” for each leg for 2200 pound units.
4. Adjust second Straddle Leg – using a pry bar, pinch bar, rubber mallet etc. move the
straddle leg out from inside the base tube to the desired straddle width position.
Straddle Legs must be symmetrically adjusted, both legs adjusted to the
same extended dimension.
Set up procedure for Stack-N-Go straddle legs with ve bolts:
1. Back off all bolts.
2. Tighten Bolt 1 to 85 foot pounds.
3. Tighten Bolts two (2) to 85 foot pounds.
4. Tighten Bolt 3 to 85 foot pounds.
5. Tighten Bolt 4 to 25 foot pounds - NOT 85 foot
pounds!
6. Securely tighten all lock nuts.
When adjusted
correctly, white line
cannot be seen.
1270 MAXIMUM
1020 REF.
WHITE LINE
JUST SHOWING
BOLT 4BOLT 4
BOLT 1
BOLT 3
BOLTS 2BOLTS 2

12Southworth Products FPS2500-90NAS Manual
4.2 Inspection
Upon receipt of the stacker, inspect the equipment completely to determine if there is any shipping
damage, and that the lift is complete. Southworth tests and inspects every piece of equipment
prior to shipment. If damage is apparent, a freight claim must be led with the freight company.
Do not use the stacker if there appears to be any damage. With the stacker in a lowered position,
check the following:
• Check for signs of damage especially to the back cabinet that houses the battery, electrical/
hydraulic power pack.
• Check all electrical and hydraulic connections for tightness.
• Remove back panel.
1. Turn key switch to “OFF” position.
2. Push in E-stop and unscrew the red knob.
3. Lift off back panel. There is enough wire to the key switch to allow the panel to be set aside.
• Inspect for any bent or damaged parts.
4.3 Removing From Pallet
Each of the Southworth stackers is shipped out on a pallet or skid. Prior to removing the unit from
the pallet or skid, remove all tie down straps and packaging. Visually inspect the unit as closely as
possible.
With an overhead hoist or forklift, carefully pick up the unit taking into consideration the center
of gravity of the unit. If you choose to pick the unit with an overhead hoist, use a nylon sling and
hoist with a minimum of 2,000-lb. capacity. The nylon sling will not do any damage to the steel
construction of stacker. Pick the unit up. On conventional masts use the top cross-member of the
lift. On narrow masts the cover must be removed to access lifting equipment. Be careful of the
stacker swinging once fully lifted off the pallet or skid. Have all personnel completely cleared from
the area.
Pick the unit up approximately six inches above the pallet or skid. Once raised, remove the pallet
or skid from below the lift. Do not move the lift around in the air. Lower the stacker on the ground.
4.4 Preparation For Use
This stacker left our factory in new condition. It has been inspected and weight tested to assure all
performance standards have been met.
Visually inspect the stacker for damage. Check for attachments and accessories that may
have been ordered. If there is any damage or missing parts, report it to your carrier and your
Southworth dealer immediately.
Remove all metal/plastic bands, cardboard and other material used for shipping purposes.
Check to see if chains are in place, and that the lift system is in working order. Inspect for oil leaks.
Connect battery cable. Check cables and wires on battery charger as well as battery.

13Southworth Products FPS2500-90NAS Manual
5. Operation
5.1 To Raise and Lower
There are two buttons located on both sides of the handle. The inside one is for lowering the forks.
The outside one is for raising the forks. When operating, always make sure the load being lifted
is within the loading capacity of your stacker and the load has been stacked safely on the pallet.
Also, make sure that the length of the forks corresponds to the length of the pallet. In this way, the
load rollers will place themselves in the opening at the end of the pallet, so that when you raise
the forks, you will not break the bottom boards of the pallet. Always make sure that when entering
the pallet that the forks are in the fully lowered position. Be careful when lifting pallets that are too
short or too long for the stacker. It might destroy your pallet by breaking the bottom boards, and
if the forks project through the end of the pallet, the tips of fork may go into the next pallet that is
behind the pallet that you are lifting, which may bend the tips of forks and overload the capacity of
the stacker.
5.2 Travel Function
To travel, rotate the buttery controls throttle on the upper part of the handle. When rotating the
buttery control towards the forks, the stacker runs forwards in the forks rst direction. When
rotating the buttery towards the operator, the stacker runs in the reverse direction. Always make
sure the stacker clears any obstruction when traveling, and that your path of travel is clear of
people. Never carry loads above the loading capacity of the stacker. It is suggested that when
traveling without a load, the forks be in the lowered position. The speed of the stacker is increased
by the degree of the rotation in either direction; it functions like a throttle. W hen you release your
hand from the buttery control, it automatically will resume to the neutral position and the speed of
the stacker will slow down, and come to a stop.
5.3 Turtle Speed Travel
When the buttery control is engaged forward (toward the forks) or reverse (toward the operator
if the operator simultaneously engages the turtle speed button the forward and/or reverse speed
is limited to 50% of full speed or turtle speed. The operator can engage the buttery forward with
the right hand and engage the turtle speed button with the left hand. The operator can engage
the buttery forward with the left hand and engage the turtle speed button with the right hand. The
reverse operation is also controlled with either hand. The turtle speed is maintained only when the
turtle speed button is engaged. When the turtle speed button is not engaged the unit will operate
at full speed. The turtle speed button is a maintained contact operation.
Turtle Speed

14Southworth Products FPS2500-90NAS Manual
5.4 Electric Brake
Your stacker is equipped with an electric magnetic brake. The brake is applied when the handle is
in its vertical position between 10 – 15 degrees and lowered position between 80 – 90 degrees.
The brake could be released when you pull down the handle at any point between 15 – 80
degrees. Always make sure the brake is released before operating the stacker. When the stacker
is running, you could brake the stacker by raising the handle to its vertical position or lowering the
handle to its lowest position. Or, to turn the buttery controls in the opposite direction, the change
in direction of the motor will slow down, stop, and reverse the direction of stacker. When parked,
the handle will spring back to the full vertical position with the brake applied and the forks in
lowered position.
5.5 Reversing Safety
At the end of the handle there is a large, red reversing bar (belly button switch) that is designed to
protect the operator from injury. When the operator runs the stacker backwards, and the end of the
handle comes in contact with the operator’s body, the stacker will automatically reverse direction
and travel away from the operator. When the reversing safety bar comes in contact with your body
during operation, immediately release your hands from the buttery control and put the handle up
to its vertical position or down to its lowest position and the brake is on. The reversing safety bar
will automatically resume to its original position after being activated.
5.6 Horn
As standard equipment, a horn that is located on the top of the handle.
6. Maintenance & Repair
DO NOT USE LIFT IF IT IS NOT OPERATING PROPERLY, OR APPEARS
UNSAFE IN ANY WAY!
All maintenance to be performed with the forks fully lowered.
Turn off the key and disconnect the battery before performing any
maintenance.
6.1 Before Each Use
• Check for corroded and loose battery terminals. A white powder substance will be present if
there is any existing corrosion.
• Visually inspect for any cracks or damage to the casing.
• Check for loose battery tie-downs.
• Inspect wire connections on the battery charger. Check power cord for nicks/damage.
• Check power charger for proper mounting.
• Inspect pump and cylinder for oil leaks.
• Check hydraulic oil level.
• Check hydraulic ttings and hoses.
• Check ram for nicks/damage.
• Check chain roller assembly connections.
• Check for any worn or damaged parts.

15Southworth Products FPS2500-90NAS Manual
6.2 Battery Maintenance
Never alter the AC cord or plug provided. If it will not t outlet, have
proper outlet installed by a qualied electrician. Improper connection
can result in a risk of an electric shock.
PREPARING TO CHARGE A BATTERY
Always turn off E-stop and key switch before working with the batteries. Be sure the area around
the stacker and the battery is well ventilated while battery is being charged. The battery terminals,
connections and wiring connections should be clean and free of corrosion. When cleaning any of
these components wear a face shield or other suitable protective eye wear.
BATTERY CHARGING
Charging must be performed with the charger that is provided with or pre-wired into the machine.
During charging, the temperature in the battery must not exceed 120 F. Charging simultaneously
with truck operation is not recommended. Plug the charger into a 115 volt outlet. Charge until the
battery gauge indicator lights show fully charged (approximately 6-8 hours).
WARNINGS AND BATTERY INFORMATION
Avoid use of open ame near batteries. At temperatures around freezing point, battery capacity
is reduced by 30%. The battery terminals, connections and wiring should be clean and free
of corrosion. When cleaning any of these components, wear a face shield or other suitable
protective eye wear. Read, understand, and follow all battery and battery manufacturer’s specic
precautions while working with and/or charging batteries.
BATTERY MAINTENANCE
To measure the voltage, use a digital voltmeter (DC) on the battery poles. The truck must not
have been in use for the previous 30 minutes.
BATTERY CHARGER OPERATION
Disconnect the charger from the 115 volt wall outlet once the indicators read fully charged.
Voltage State
12.7V Fully Charged
12.2V 1/2 Charged
12.0V 1/4 Charged
11.6V Fully Discharged
LED Instruction:
Red light on: Charge error (Voltage <11V)
Red ashing light: Battery reversed polarity
Yellow ashing light: No battery connected
Yellow light on: Normal charging
Green ashing light: 80% charged
Green light on: Fully charged
Two leftmost LEDs blinking indicate EMPTY
Recommend charging the system before the BDI
indicates empty in order to extend battery life.
0 1/2 1
88888.8
Here, second from left LED
blinks indicating reserved
power is above 70%.
At this point we recommend
charging the system

16Southworth Products FPS2500-90NAS Manual
6.3 Periodic Maintenance
6.3.1. Weekly Maintenance
• Inspect the machine for damage. Check for bent, dented, or broken parts.
• Check the lift system for binding or excessive movement in the forks. Check for quiet and
smooth operation of the lift cylinder. Check all moving parts and linkages.
• Check the hydraulic system for leaks. Check hydraulic uid level.
• Check wheels and castors for wear and/or damage. Ensure they turn smoothly.
• Inspect lift chains. Check to see they are in place and not loose.
• Inspect forks. Check for bending and/or cracks.
• Inspect the brake. Verify the brake works correctly.
• Inspect all electrical wiring for loose connections or damage.
• Verify all precautionary labeling is in place and legible.
6.3.2. Monthly Maintenance
• Clean battery terminals and battery compartment.
• Clean and inspect the hydraulic cylinder for leaks or damage.
• Lubricate the chain with a rust inhibitive lubricant (light machine oil).
• Check chain tension. It should be even on both chains. The chain should be tight enough so
that is does not come off the roller assembly.
• Inspect the frame assembly for damage or wear.
• Clean and lubricate all roller bearings, cam followers, and all moving parts.
• Clean and inspect all welds.
• Check wheels for wear or damage.
• Inspect the nameplates. Verify they are legible.
• Check battery, motor, controllers, limit switches, electrical conductors and connections.

17Southworth Products FPS2500-90NAS Manual
6.4 Ordering Replacement Parts
Southworth has carefully chosen the components in your lift to be the best available for the
purpose. Replacement parts should be identical to the original equipment. Southworth will not be
responsible for equipment failures resulting from the use of incorrect replacement parts or from
unauthorized modications of the machine.
Southworth will gladly supply you with replacement parts for your Southworth lift. With your order,
please include the model number and the serial number of the lift. You can nd these numbers on
the name plate. When you are ordering parts for a cylinder, also include the cylinder number. This
is stamped on the base of the cylinder housing.
To order replacement parts, please call the Parts Department. See Warranty & Contact
Information section.
• Parts are shipped subject to the following terms:
• FOB factory
• Returns only with the approval of our parts department.
• Payment net 30 days (except parts covered by warranty).
• Freight collect (except parts covered by warranty).
• The warranty for repair parts is 30 days from date of shipment.
Parts replaced under warranty are on a “charge-credit” basis. We will invoice you when we ship
the replacement part, then credit you when you return the worn or damaged part, and we verify
that it is covered by our warranty. Labor is not covered under warranty for Parts orders.

18Southworth Products FPS2500-90NAS Manual
7. Troubleshooting
Turn off key and disconnect the battery before performing any
maintenance.
Unit will not lift (motor does not run)
• Faulty wiring from fuse to lift switch in handle
• Faulty lift switch
• Faulty wiring from battery positive terminal to pump contactor to pump motor.
• Burned out brushes in pump motor
• Low hydraulic pressure caused by:
• Pressure relief valve needs adjustment
• Pump check valve stuck open
• Faulty solenoid valve
• Faulty wiring from lift switch to solenoid
• Faulty lift contactor
• Defective control circuit fuse
• Chain or roller bound
• Check oil level
Forks will not lower
• Look for binding in chains or rollers
No electrical power
• Dead Batteries:
• Keyswitch on “OFF” position
• E-stop button depressed
• Loose or dirty battery connections
• Blown fuse(s)
• Faulty wiring from fuse to travel control switch
• Faulty control switch
• Faulty wiring from travel control switch direction contactor
• Faulty contactor

19Southworth Products FPS2500-90NAS Manual
8. Stacker Body Components
Item Descripon Qty
1 Spacer 4 2 Load Wheel 2
3 Bearing 4 4 Spindle 2 5Bolt 4 6 Straddle Leg (L.H.) 1
7 Nut 10 8Bolt 10
9Bolt 2
10 Seat, Fixing 1 11 Drive Wheel Cover 1
12 Rear Cover 1
13 Mast Cover 1
14 Straddle Leg (R.H.) 1
15 Bolt 2
16 Baery Holder 4
17 Cover 1 18 Stacker Body Assem
b
1
19 Bolt 1
20 Caster Wheel 1
21 Bolt 4 22 Washer 4
23 Nut 4 24 Bolt4

20Southworth Products FPS2500-90NAS Manual
9. Control Pod
9.1 August 2018 and Prior