Presto DSL Series Setup guide

DSL
for series
DSL, TSL, QSL
Installation, Operation
and Service Manual
Model Number ___________________________
Serial # ________________________________
Date placed in service _____________
IMPORTANT: READ CAREFULLY
BEFORE INSTALLING OR OPERATING LIFT
Part orders are subject to a $50 minimum charge.
December 5, 2019

2 DSL OWNER’S MANUAL
This manual was current at the time of printing. To obtain the latest, most updated version,
please contact Presto-ECOA Lifts Customer Service Department or go to our website:
www.PrestoLifts.com where you will nd a complete list of current owner’s manuals to print.

DSL OWNER’S MANUAL 3
CONTENTS
INTRODUCTION ............................................................................................................4
RESPONSIBILITY OF OWNERS AND USERS .............................................................5
SAFETY ALERT SYMBOLS AND SIGNAL WORDS.......................................................6
SAFE SERVICING ..........................................................................................................7
SAFETY PRECAUTIONS................................................................................................8
INSTALLATION INSTRUCTIONS ..................................................................................9
Preparation ........................................................................................................9
Positioning the Lift ...........................................................................................10
Hydraulic Connections .....................................................................................10
Electrical Connections...................................................................................... 11
Completing Installation ....................................................................................12
OPERATING INSTRUCTIONS .....................................................................................12
Operating Procedure ........................................................................................12
Labels and Precautionary Markings .................................................................13
MAINTENANCE ...........................................................................................................14
Hazards ...........................................................................................................14
Troubleshooting Check List & Warnings......................................................16-17
ORDERING REPLACEMENT PARTS ..........................................................................18
2 YEAR WARRANTY ....................................................................................................23
List of Figures
Figure 1 Safe Servicing of Lift .................................................................................7
Figure 2 Mount the Lift Securely .............................................................................9
Figure 3 Using Lifting Eyes .....................................................................................9
Figure 4 Center the Load ...................................................................................... 11
Figure 5 Secure the Load ...................................................................................... 11
Figure 6 Labels & Precautionary Markings ...........................................................13
Figure 7 Pinch Points ............................................................................................14
Figure 11 Electrical Connections, Lifts Wired for Single-Phase AC ..........................19
Figure 12 Wiring Diagram, Lifts Wired for Single-Phase AC with limitswitch ..........20
Figure 13 Electrical Connections, Lifts Wired for Three-Phase AC .........................20
Figure 14 Schematic, Lifts Wired for Three-Phase AC ............................................21
Figure 15 Hydraulic Connections ............................................................................21
Figure 16 Hydraulic Diagram ....................................................................................22
Tables
Table 1 Hydraulic Oil Specications .....................................................................10
Table 2 Electrical Interface, Supplied by Customer .............................................22

4 DSL OWNER’S MANUAL
S E C T I O N 1
INTRODUCTION
This manual attempts to provide all of the information necessary for the safe and
proper installation, operation and maintenance of scissor Llfts. It is important that
all personnel involved with the installation, maintenance or operation of the scissor
lift read this manual.
Where unique situations arise, that are not covered in this manual, call Presto-ECOA
Lifts for further instructions. Additional manuals are available upon request or on
our web site at www.prestolifts.com.
The scissor lift has a nameplate that provides the load capacity ratings, serial
number and model identications. Please refer to these numbers when ordering
parts or requesting further information.
The scissor lifts are designed for lifting, lowering and positioning a variety of loads.
WHERE UNIQUE SITUATIONS ARISE, THAT ARE NOT COVERED IN THIS
MANUAL, CALL PRESTO-ECOA LIFTS FOR FURTHER INSTRUCTIONS.
The scissor lifts are designed for inplant/nonhazardous location use only. These
units are not for personnel lifting.

DSL OWNER’S MANUAL 5
Responsibility of Owners and Users
Inspection and Maintenance
The device shall be inspected and maintained in proper working order in accordance with Presto-
ECOA owner’s manual.
Removal from Service
Any device not in safe operating condition such as, but not limited to, excessive leakage, missing
rollers, pins, or fasteners, any bent or cracked structural members, cut or frayed electric, hydraulic,
or pneumatic lines, damaged or malfunctioning controls or safety devices, etc. shall be removed
from service until it is repaired to the original manufacturer’s standards.
Repairs
All repairs shall be made by qualied personnel in conformance with Presto’s instructions.
Operators
Only trained personnel and authorized personnel shall be permitted to operate these lifts.
Before Operation
Before using the device, the operator shall have:
• Read and/or had explained, and understood, the manufacturer’s operating instructions and
safety rules.
• Inspected the device for proper operation and condition. Any suspect item shall be carefully
examined and a determination made by a qualied person as to whether it constitutes a hazard.
All items not in conformance with Presto’s specication shall be corrected before further use of
these lifts.
During Operation
The device shall only be used in accordance with this owner’s manual.
• Do not overload.
• Ensure that all safety devices are operational and in place.
Modications or Alterations
Modications or alterations to any Presto-ECOA industrial positioning equipment shall be made only
with written permission from Presto.

6 DSL OWNER’S MANUAL
SAFETY ALERT SYMBOLS AND SIGNAL WORDS
The safety of all persons operating, maintaining, repairing, or in the vicinity of this equipment is of paramount concern. This is
a powerful machine with moving parts, and is capable of causing personal injury if proper precautions are not taken. Therefore,
throughout this manual, certain hazards have been identied which may occur in the use of the machine, and there are appro-
priate instructions or precautions which should be taken to avoid these hazards. In some cases, there are consequences which
may occur if instructions or precautions are not followed. Below are the symbols and signal words along with their denitions
referenced from ANSI Z535.4 - Product Safety Signs and Labels.
4.11 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.
4.14 Signal Words: The words used in the signal word panel. The signal words for hazard alerting signs are “DANGER,”
“WARNING,” and “CAUTION.” Safety notice signs use the signal word “NOTICE.” Safety instruction signs use signal words that
are specic to the situation.
DANGER indicates a hazardous situation which, if not avoided, will result
in death or serious injury.
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.
NOTICE is used to address practices not related to physical injury.
SAFETY INSTRUCTIONS (or equivalent) signs indicate specic safety-
related instructions or procedures.
NOTE: DANGER, WARNING or CAUTION should not be considered for property damage accidents unless personal injury risk
appropriate to these levels is involved.
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) and E): for use with DANGER, WARNING, or CAUTION signal word; (D: is a safety yellow triangle with a
black border and safety black exclamation mark; E: is a safety yellow triangle with a safety black exclamation mark and a
safety yellow border around a safety black band)
NOTE: D and E are provided to allow for consistency with certain ISO standards such as ISO 3864-1 and ISO 3864-2.

DSL OWNER’S MANUAL 7
SAFE SERVICING
OF THE LIFT
WARNING !
Only authorized personnel should perform inspection
or maintenance and service procedures. Unauthorized
personnel attempting these procedures do so at the risk
of severe injury or death.
DANGER !
Failure to properly adhere to lift blocking procedures
is to risk the sudden and uncontrolled descent of the
lift during maintenance or inspection. A falling lift can
cause severe injury or death.
This procedure describes the only factory-approved
method of working under a lift. Follow these instructions
EVERY time you plan to reach or crawl beneath the lift to
perform service or maintenance – no matter how momentary
that might be.
If the factory-provided maintenance device is damaged
or missing, stop immediately and consult the factory for as-
sistance. The manufacturer is not liable for your failure to
use the approved maintenance device(s) and procedures
that have been provided.
1. Any load must be removed from the lift prior to engaging
the maintenance device(s). These devices are designed
to support an unloaded lift only. Failure to remove the
load from the lift prior to blocking could cause the failure
of the maintenance device(s) and allow the lift to fall un-
expectedly. This can result in personal injury or death,
or permanent damage to the maintenance device(s)
and/or the lift.
2. Raise the lift to its fully raised position. If you do not,
the maintenance device(s) may not be able to be placed
properly in its/their designed blocking position.
3. Remove the maintenance device(s) from its/their storage
location and place it/them into the engaged position as
shown in Figure 1.
4. Lower the lift until it makes complete contact with the
maintenance device(s). Re-check to ensure that all
provided devices are fully and securely engaged. If
the device(s) is/are not fully engaged the lift could fall
unexpectedly, resulting in permanent damage to the
device(s) or the lift.
DANGER !
If for any reason you are unable to lower the lift com-
pletely onto the maintenance device(s), stop immedi-
ately and consult the factory. Failure to properly use the
factory approved maintenance device(s) could result in
severe injury or death.
5. (For single-acting hydraulic, and pneumatic lifts) Once
the maintenance device(s) is/are properly and securely
engaged, continue to press the down button, valve or
switch for an additional 5-10 seconds to relieve all pres-
sure in the operating system.
WARNING !
Failure to relieve operating system pressure could result
in the sudden and unexpected release of high pressure
uids (or air) during maintenance and/or repair of the lift
and result in severe injury or death.
6. Follow OSHA electrical lock-out/tag-out procedures.
Disconnect and tag all electrical and/or other power
sources to prevent an unplanned or unexpected actua-
tion of the lift.
7. Once inspection or work is complete, reverse the perfor-
mance of the steps above to raise the lift off the main-
tenance device(s) and place the device(s) back into its/
their designated storage position(s).
DANGER !
HIGH VOLTAGE ! – Disconnect and/or lock out the
electrical supply to the power unit prior to any installa-
tion or maintenance being performed.
Fig. 1 – Safe Servicing of Lift

8 DSL OWNER’S MANUAL
WARNING!
• Do not perform any repair work on a lift with a load on the platform or with the table in a raised position.
• All personnel must stand clear of the lift when the lift is in motion.
• Do not put hands or feet under lift table.
• Do not perform any repair or maintenance work with the lift in an open position without securing it
rst with proper maintenance devices.
• Do not stand, sit or climb on the lift at any time.
• Do not use the lift on soft, uneven or unstable surfaces.
• Do not exceed the load capacity rating on the data plate.
• Do not place a load on a moving lift.
• Do not exceed load capacity.
• Place a load in the center of the lift and be sure that the load is secured properly.
S E C T I O N 2
SAFETY
The safety of all persons installing, using, servicing, or working near the unit is of paramount concern to
Presto-ECOA Lifts. The lift is a powerful machine with moving parts, and is capable of causing personal
injury if proper precautions are not taken. Therefore, throughout this manual, Presto-ECOA Lifts have
identied certain hazards, which may occur in the use of the unit, and provided appropriate instructions
or precautions that should be taken to avoid these hazards. In some cases, Presto-ECOA Lifts has also
pointed out the consequences that may occur if Presto-ECOA Lifts instructions or precautions are not
followed. Presto-ECOA Lifts use the following nationally recognized system for identifying the severity
of the hazards associated with its products:
DANGER – Immediate hazard that will result in severe personal injury or death.
WARNING – Hazard or unsafe practice, that could result in severe personal injury or death.
CAUTION – Hazard or unsafe practice, that could result in minor personal injury or property
damage.
In the interest of safety, please read the entire manual carefully. You must understand the material
in this manual before you install, use, or service the unit. If you have any question about any of
the instructions in this manual, please contact Presto-ECOA Lifts at 1-800-343-9322.

DSL OWNER’S MANUAL 9
INSTALLATION INSTRUCTIONS
Preparation
1. Before you start to install the lift, check for local codes
and ordinances which may apply. It is your responsibility to
obtain any necessary permits.
2. Read all of these installation instructions carefully.
Be sure to read and understand all of the warnings!
3. If your unit is designed to be installed in a pit, check the
pit before you start to install the lift. Measure the length and
width of the lift table, then measure the pit, and be sure the pit
allows adequate clearance. Does the pit have 90° angles at
each corner? To check, measure across the opposite corners
of the pit. The measurement on each diagonal should be the
same, within 1/2 inch. The walls of the pit should be vertical.
Check with a carpenter’s square.
Fig. 3 – Using Lifting Eyes
The chain should pull
nearly straight up
Chain spreader
Eye bolt
Captive nut
Base nut
Fig. 2 – Mount the Lift Securely
4. If the power unit will be mounted away from the lift
(“external power unit”), check the mounting arrangement
for the power unit. The power unit should be sheltered from
the weather. It should be mounted within 30 feet of the lift to
minimize the pressure drop in the hydraulic system. Be sure
the hydraulic lines have been installed properly.
WARNING!
Protect the power unit from rain or moisture.
If the electrical parts in the power unit get wet,
workers may be hurt by electrical shock. The
electrical parts may fail if they are wet.
WARNING!
The electric motor in the lift can create sparks.
Don’t install the power unit in an area where
ammable gases may be present.

10 DSL OWNER’S MANUAL
5. If the power unit is mounted within the lift (“internal power
unit”), you will need these tools:
• A crane or lift truck that can lift the unit safely.
• Shims and lag bolts – see the pit plan if the lift will be
mounted in a pit.
• A masonry drill and bit to drill the holes for the lag bolts.
• A power supply with the specied voltage, including fuses
or circuit breakers as specied in Figs. 11 and 12.
If the power unit will be mounted away from the lift (“external
power unit”), you will also need:
• A compressed air source for clearing the hydraulic lines.
• Extra hydraulic oil for ushing the underground lines and
relling the tank. See Table 2 for the oil specications.
Positioning the Lift
6. Remove the shipping material and unskid the lift. On the
front of this manual, conrm the model number, serial number,
and date the lift is placed in service. You can nd the model
number and serial number on the name plate. The name
plate is located on the crossbar at the base of the cylinders.
7. Move the lift into position, supporting the base of the lift.
Install the lift as shown in Fig. 2. Unless the lift is mounted
on casters, lag the lift to the oor.
CAUTION!
Do not hang the lift from the table top. This can
damage the lift.
WARNING!
If the lift is mounted on an unstable surface, it
may tip over when it is in use. You may be hurt,
and the lift and load may be damaged.
If your lift has lifting eyes, as shown in Fig. 3, use these
when you move the lift. It is best to use a chain spreader,
so the chain sections pull straight up. (You must supply the
chain and spreader.) Remove the lifting eyes once you have
moved the lift.
Hydraulic Connections
(External Power Units Only – If Internal Power Unit, proceed
to step 10.)
8. Install the power unit. Install the hydraulic line between
the power unit and the lift as shown on the pit plan.
9. Blow out the hydraulic line with compressed air before
connecting it to the power unit. Replace the solid plug on the
hydraulic uid tank with the vented plug supplied, then attach
the vent line to the vented plug.
WARNING!
Be sure that the hydraulic line will not be pinched
by the lift as it raises or lowers. If you allow
the line to be pinched, the lift may not work
properly. A hose may break, the lift table may
drop suddenly, and someone may be hurt.
CAUTION!
It is very important to keep the hydraulic oil free of dirt,
dust, metal chips, water, and other contamination.
Most of the problems with hydraulic systems are
Table 1 – Hydraulic Oil Specications
If the lift will be used at normal ambient temperatures, Presto supplies the unit with CONOCO 32 oil. This may
be replaced by any other good quality oil with 150 SSU at 100° F and rust and oxidation inhibitors and anti-wear
properties.
If the lift will be used at ambient temperatures below 0°F, use aircraft hydraulic oil. Use Type 15 aircraft hydraulic oil.
The following are equivalent to CONOCO 32:
TYPE MANUFACTURER
DTE 24 ............................. EXXON/MOBIL
NUTO H32 ........................ EXXON/MOBIL
AMOCO AW32 .................. CHEVRON (AMOCO CO.)
CAUTION!
It is very important to keep the hydraulic oil free of dirt, dust, metal chips, water, and other con-
tamination. Most of the problems with hydraulic systems are caused by contamination in the oil.

DSL OWNER’S MANUAL 11
caused by contamination in the oil. Be sure to ush
all hydraulic lines before connecting remote power
units.
CAUTION!
If you do not install the vented plug in the tank, the
pump may be damaged.
Electrical Connections
DANGER!
The lift may use a power supply of up to 575 Volts
AC. This voltage can kill you. Don’t work with
the electrical parts unless you are a qualied
electrician.
10. Make temporary electrical connections to the lift, as
shown in Fig. 11 (for single-phase AC) or Fig. 12 (for three-
phase AC). This temporary set-up will allow you to raise the
lift.
WARNING!
The fusing requirements are shown in Table 1.
To avoid re danger, follow these requirements.
11. On a lift designed for three-phase AC, you must be
sure the pump motor is turning in the right direction. The
lift table should start to move quickly when you press the
“up” or “down” button. If the lift table does not move in 2 or
3 seconds, don’t try to operate the lift! Exchange any two of
the three-phase leads. If this does not correct the problem,
see the troubleshooting instructions at the end of this manual.
CAUTION!
If you have a unit designed for three-phase AC and
you connect the power so the motor runs backwards,
the lift will not operate, and you may damage the
pump. Do not operate the lift for more than 2 or
3 seconds if you think the motor might be turning
backwards.
12. Raise and chock the lift, as shown in Fig. 1.
13. Make the permanent electrical connections as shown in
Fig. 11 (for single-phase) or Fig. 12 (for three-phase).
14. Check the level of the hydraulic uid. On most models,
when the lift is fully elevated, the oil should be about 3/4 inch
above the bottom of the tank. Use a dipstick to check the oil
level, and add oil as necessary.
Testing
15. Clear the area around the lift. Remove any loose wires,
lumber, or other materials which might get in the way of the
lift as it raises or lowers.
16. Remove the maintenance chocks and warn others to
stay away from the lift. Operate the lift through its full range
of travel. The lift should rise smoothly with a quiet humming
sound, and lower smoothly and quietly. Raise and lower the
lift a few times to check the clearances around the lift table.
WARNING!
As the lift table moves up and down, “pinch
points” are created at the places shown in Fig.
Fig. 4 – Center the Load Fig. 5 – Secure the Load
Always place the load in the
center of the lift table If the load can roll or move,
insert chocks, or fasten
the load down

12 DSL OWNER’S MANUAL
6. If you are standing too close to the lift when it
is moving, your arm or leg may be caught in the
moving parts, and you may be hurt. Stay away
from the pinch points when the lift is moving.
Completing Installation
17. If your lift is mounted in a pit, align the unit with the sides
of the pit. Once you are sure the lift is positioned correctly,
mark the locations of the lag holes in the base frame, and drill
the holes. If necessary, insert metal shims to level the base
of the lift. Insert and tighten the lag bolts to secure the lift.
Grout under the base rails to prevent vibration and distortion
of the base frame, as shown in Fig. 2.
18. If the lift is lowering too quickly or too slowly, you can
change the “down speed” by adjusting the ow control.
WARNING!
When adjusting the ow control, always raise
the lift table and insert the maintenance chocks,
as shown in Fig. 1. Don’t try to adjust the ow
control while pressing the “down” button. If you
try this, the lift table may drop suddenly, and you
may be hurt.
It is important that you follow these steps when adjusting
the ow control:
• Raise the lift table and chock the legs, as shown in
Fig. 1.
• If you want the lift to lower more slowly, turn the control
clockwise up to 1/4 turn at a time. If you want the lift to
lower more quickly, turn the control counterclockwise up
to 1/4 turn. Don’t move the control more than 1/4 turn at
a time.
• Remove the maintenance chocks, and check the descent
speed.
• Every time you want to change the adjustment again,
raise the table again and insert the chocks as shown in
Fig. 1.
19. Test the lift with the rated load. If the lift does not rise, and
you hear a loud squealing noise, the pressure relief valve is
operating. Contact Presto-ECOA for instructions.
WARNING!
Don’t continue to use the lift if this happens.
The pump will overheat very quickly, and may be
permanently damaged. Do not try to adjust the
relief valve. If you change the setting on the relief
valve, you may overwork the lift. This can cause
the lift to fail suddenly, and you may be hurt.
20. As a nal step, clean up all spilled hydraulic uid. Spilled
hydraulic oil is slippery, and may present a re hazard. If you
clean up any spilled uid, you will be able to tell immediately
if the lift begins to leak.
OPERATING INSTRUCTIONS
Operating Procedure
1. Before operating the lift, read and understand this entire
section. Also read and understand the inserted information
on optional modications and accessories.
DANGER!
The lift may use a power supply of up to 575
Volts AC. This voltage can kill. Don’t work with
the electrical parts unless you are a qualied
electrician!
2. If the lift is on casters, place it on a rm, at surface as
shown in Fig. 2. Stationary lifts should be lagged to the oor.
WARNING!
If you place the lift on a soft surface, it may tip
over, especially when it is loaded or raised.
Someone may be hurt, and the lift and load may
be damaged.
3. Load the lift correctly.
• Be sure that the load weighs no more than the maximum
rated for the lift. The maximum rated load is shown on
the platform skirt.
WARNING!
Don’t try to lift a load that exceeds the maximum
rating. If you try this, the lift may fail suddenly.
Someone may be hurt, and the lift and load may
be damaged.
• Place the load in the center of the lift table, as shown in
Fig. 4.
• Don’t try to load the lift while the lift table is moving.
• If you are lifting pipes or other objects which may be
able to roll or move, fasten them down, or chock them
as shown in Fig. 5.
4. Be sure all workers are clear of the lift. Remove any
lumber or other material which may fall onto the lift.
WARNING!
Don’t use the unit to lift people unless it has been
specially equipped for this purpose. A specially
equipped lift will include operator protection,
and an excess ow protector to keep the lift from
dropping suddenly if a hydraulic line is damaged.
Retrot kits are available if you want to add these
features to your lift.
WARNING!
As the lift table moves up and down, “pinch
points” are created as shown in Fig. 6. Stay away
from these pinch points! Part of your body or
clothing may become caught, and you may be
hurt.

DSL OWNER’S MANUAL 13
Fig. 6 – Labels and Precautionary Markings
DSL TSL QSL
PRESTO-ECOA

14 DSL OWNER’S MANUAL
S E C T I O N 5
MAINTENANCE
Generally, the scissor lifts require very little maintenance.
Reasonable care will result in excellent trouble-free perfor-
mance.
WARNING!
Never go under or service lift with a load on the table or
with the scissor mechanism unblocked. Always service
the lift in a down position.
All servicing should be done by qualied personnel. Qualied
personnel should be able to read and understand wiring and
hydraulic diagrams. They should be able to troubleshoot live
electrical circuits safely and in accordance with accepted
practice. For safety’s sake, if in doubt, please contact your
dealer or Presto/ECOA Customer Service Department at
[phone]. Before servicing the lift, read and under-
stand this entire section and the section entitled “Operating
Instructions.”
Hazards
There are several hazards you should be aware of as you
service the lift:
DANGER!
The lift may use a power supply of up to 575 Volts AC.
This voltage can kill. Do not work with the electrical
parts unless you are a qualied electrician!
WARNINGS
• As the lift moves up and down, “pinch points” are
formed as shown in Figure 2. Keep hands, feet, and
loose clothing away from these pinch points. If your
hand or arm or a part of your clothing is caught, you
may be hurt.
• A falling lift can cause severe personal injury.
Before working under the lift remove any load from
the platform, raise the lift and insert the maintenance
devices, as shown in Figure 1. Do this every time you
work under the lift!
WARNINGS
Release of uids under high pressure can cause
personal injury. Before you open any part of the
hydraulic system, be sure to release the hydraulic
pressure.
CAUTION
•The warning labels on the lift are there for the safety
of the operators. If the labels are worn or missing, or
5. Operate the lift. Press and hold the “up” button to raise
the lift, and “down” to lower it. Release the button when the lift
reaches the limit of travel. If the lift does not operate within 2
or 3 seconds, turn off the lift and call a qualied maintenance
worker.
WARNING!
If you hear a squealing noise from the pump, the
pressure relief valve is operating. Don’t continue
to use the lift! The pump will overheat very
quickly, and may be permanently damaged. The
relief valve is included to protect the machine
operators – don’t change the relief pressure
setting.
6. Wait until the lift table has stopped. Unload the lift.
WARNING!
The warning labels on the lift are there for
your safety. If you nd that the labels are worn
or missing, or have been painted over, ask
Maintenance to replace the labels before you use
the lift. The labels are shown in Fig. 7.
Fig. 7 – Pinch Points

DSL OWNER’S MANUAL 15
have been painted over, replace them before releas-
ing the lift for operation.
WARNING!
If you are going to repair the center pivot pins and
bushings, you must support the lift table in a spe-
cial way. Each set of leg plates, on both sides of the
unit, must be clamped together rmly, using large
C-clamps. You cannot use the maintenance devices
shown in Figure 1 – with the pivot pins removed, they
will not support the table top. If you do not support
the lift table correctly, the top may drop suddenly
when you remove the pivot pins. Please contact
Presto/ECOA for instructions.
NOTICE
It is important to use hydraulic uid with the correct
grade and properties. See the hydraulic oil specica-
tion in this manual, Table 1.
WARNING!
If a hydraulic tting becomes loose, or if a hydraulic
hose breaks, the hydraulic uid may escape from the
system under pressure. If the lift is raised when this
happens, it can drop quickly. Someone may be hurt,
or the lift or load may be damaged.
NOTICE
If you continue to use uid after it has “worn out,” the
moving parts in the system will wear more quickly.
If the lift will not raise:
NOTICE
Do not continue to hold the “up” button for more
than 2 or 3 seconds. You may damage the pump.
WARNING!
Do not change the relief valve setting. This valve
has been included for the protection of workers
who install, use, or service the lift. If it is ever nec-
essary to repair or reset the valve, contact Presto/
ECOA for instructions.
WARNING!
It maybe necessary to electrically by-pass the up limit
switch to place the lift on the chocks. Ensure that
doing so will not operate the switch beyond its arms
physical limits. This needs to be done by qualied
maintenance personnel. If electrical by-pass is not
possible the up limit switch needs to be moved in
order to place the unit on the maintenance devices,
then the lift platform and legs will need to be sup-
ported before working on the switch, support the
top and leg sets with a crane, fork truck or blocking
from the oor to table top. Ensure switch is properly
reinstalled any any electrical by-pass is removed
before operating the lift. Any nal adjustment of limit
switch needs to occur with the legset and platform
supported while working under the lift. If you do by-
pass or remove the switch, when the lift platform
moves up, it may not stop at the correct point. If the
platform rises above the normal stopping point, the
frame of the unit may be damaged. People working
nearby may be hurt.
NOTICE
If cavitation is allowed to continue, the pump may be
damaged, and may have to be replaced.
If the lift elevates, but fails to hold a load:
WARNING!
Failure to insert the maintenance devices may
result in damage to the lift and severe personal
injury!
If the lift fails to lower:
WARNING!
Failure to insert the maintenance devices may
result in damage to the lift and severe personal
injury!
DANGER!
Do not try to adjust the ow control while pressing
the “down” button. If you try this, the lift table may
drop suddenly, and you may be hurt.

16 DSL OWNER’S MANUAL
PROBLEM POSSIBLE CAUSE CHECK THIS
Lift will not raise
Weight of load too heavy Check the actual weight of the load
Motor not running Check the main disconnect switch, fuses, and wiring to
the motor. A 20 amp, designated braker must be supplied
for 110V
Hydraulic oil level low When lift is raised as far as possible, oil level should be
3/4” from bottom of tank. When lift is down, 3/4” from top
Lift has reached its upper limit Upper limit switch may need to be adjusted
Motor may be “single phasing” If motor hums but does not turn, check motor wiring and
line fuses.
Motor voltage too low Supply voltage should be +/- 10% of the rating at the mo-
tor terminals.
Tank vent plugged If supplied, remove solid plug from tank, insert vent plug.
Suction lter clogged Clean suction lter as described in periodic maintenance
Vacuum leak in suction line Check all ttings in suction line
Down valve may be energized Check wiring to down valve, and solenoid in the valve
Missing coupling Check to insure the coupling has been installed between
the pump and motor
The lift fails to hold
Down valve may be leaking Remove down valve and inspect for debris which may be
preventing it from closing.
Down valve may be energized Check the solenoid in the valve with a volt meter.
Cylinder may be leaking Check for oil in cylinder in the vent line.
Lift will not lower
Down valve may be de-ener-
gized
Check the solenoid in the valve with a volt meter
Flow control needs adjustment Adjust ow control as needed
Lift raises too
slowly
Voltage may be low Check voltage at motor to ensure proper voltage is being
supplied
Foreign material clogging suction
lter, breather cap or pressure
line
Remove necessary components and clean
Pump may be overheating due
to insufcient oil
Check oil level and oil viscosity
Lift lowers too
slowly
Down valve may not be fully
open or stuck closed
Remove down valve and clean
Flow control may need adjust-
ment
Adjust ow control as needed
TROUBLESHOOTING

DSL OWNER’S MANUAL 17
TROUBLESHOOTING WARNINGS
All servicing should be done by qualied personnel. Qualied personnel should be able to read and
understand wiring and hydraulic diagrams. They should be able to troubleshoot live electrical circuits
safely and in accordance with accepted practice. For safety’s sake, if in doubt, please contact your
dealer or Presto-ECOA.
Before servicing the lift, read and understand this entire section and the section entitled “Oper-
ating Instructions.”
WARNING!
Before working underneath the lift, always raise the lift and insert the maintenance
devices, as shown in Figure 1. Failure to do so may result in damage to the lift and
severe personal injury!
If the lift will not raise:
CAUTION !
Do not continue to hold the “up” button for more than 2 or 3 seconds. You may damage the
pump.
WARNING!
Do not change the relief valve setting. This valve has been included for the protection
of workers who install, use, or service the lift. If it is ever necessary to repair or reset
the valve, contact customer service. for instructions.
WARNING!
Do not disconnect the up limit switch. Instead, loosen the adjusting screw, and change
the position of the arm. If you do disconnect the switch, when the lift platform moves
up, it may not stop at the correct point. If the platform rises above the normal stopping
point, the frame of the unit may be damaged. People working nearby may be hurt.
CAUTION!
If cavitation is allowed to continue, the pump may be damaged, and may have to be replaced.
If the lift elevates, but fails to hold a load:
WARNING!
Failure to insert the maintenance devices may result in damage to the lift and severe
personal injury!
If the lift fails to lower:
WARNING!
Failure to insert the maintenance devices may result in damage to the lift and severe
personal injury!
DANGER!
Do not try to adjust the ow control while pressing the “down” button. If you try this,
the lift table may drop suddenly, and you may be hurt.

18 DSL OWNER’S MANUAL
ORDERING REPLACEMENT PARTS
Presto-ECOA Lifts has carefully chosen the components in your unit to be the best available for the
purpose. Replacement parts should be identical to the original equipment. Presto-ECOA Lifts will
not be responsible for equipment failures resulting from the use of incorrect replacement parts or from
unauthorized modications to the unit.
Presto-ECOA Lifts can supply all replacement parts for your lift. With your order, please include the
model number and the serial number of the unit. You can nd these numbers on the name plate. This
plate is located within the scissors mechanism.
To order replacement parts, please call the Presto-ECOA Parts Department. Parts are shipped subject
to the following terms:
• FOB factory
• Returns only with the approval of our parts department.
• Credit cards preferred (except parts covered by warranty).
• Freight collect for truck (except parts covered by warranty).
• Freight – prepaid and invoice for small parcel shipments (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.
Presto-ECOA Parts Department
50 Commerce Way, Norton, MA 02766
Telephone: [phone]
FAX: [phone]
Email: [email protected]
www.PrestoLifts.com
www.ECOALifts.com

DSL OWNER’S MANUAL 19
Fig. 11 – Electrical Connections, Lifts Wired for Single-Phase AC
If your lift has a dual-voltage motor, determine the correct voltage and make the connections as shown on the nameplate.
Connections shown above are for lifts operating on 120 VAC. For lifts operating on 230 VAC, a NEMA L6-15R receptacle
is required. The pump, motor, and down valve may be mounted on the lift unit itself (internal power unit) or in a separate
location (external power unit). The pump has a built-in relief valve and check valve. The down speed control is pressure-
compensated.
Electrical Connections for Single-Phase AC
BlackUP
DOWN
120VAC
in
Pushbutton or
footswitch
Ci rcuit breaker or
20A time-delay fuse
(installed by user)
Power cord
Down
valve
Motor
and pump
Tank
Up limitswitch
wired normally closed Ground
Ground
Receptacle
NEMA 5-15R
(installed by user)
Red
White
Enclosure with contactor
(see detail below)

20 DSL OWNER’S MANUAL
Fig. 12 – Wiring Diagram, LIfts Wired for Single-Phase AC – with limitswitch
Electrical Connections for Three-Phase AC
208/230/460/V-3PH60Hz
Supply voltage
(from fused disconnect)
Note: Ground connections not shown.
For ground connections use
supplied grounding terminal.
Note:Transformer connections shown
for 120V control. For 24V
control use terminal X2
instead of X1.
Connect this lead to the
correct supply voltage.
Grounding terminal
Upper travel
limit switch
(see note)
Motor
Down valve
1/Red 5/White
Up
Down
T1 T2 T3
L1L2 L3
H1H2 H3 H4
2
2
4
4
2
1
A2
A1
5
3/Bl
4/Wh
3/Bl
96
95
1 2 3 4 5 6
X2 XF X1
460V 230V 208V
T1 T2 T3
Fig. 13 – Electrical Connections, Lifts Wired for Three-Phase AC
Connect the power and control wiring to the proper terminals located in the
control panel. The pump, motor and valve may be mounted on the lift unit
itself (internal power unit) or in a separate location (external power unit).
The control panel may be wall mounted.
CAUTION!
If on power-up the motor rotates in the wrong direction, don’t con-
tinue to operate the lift. You may damage the pump. To correct the
problem, interchange any two of the motor leads (T1, T2or T3).
Down Valve
Down Valve
Motor
Jumpers “A” & “B”
Ground
Lug
Limit Switches
(Optional)
Power
Cord
Pushbutton or
Footswitch
Base End Plate
115V
1 PH
60 HZ
Fused Disconnect
(By Others)
Attach All Grounds to the
Enclosure Grounding Lug
Only Switch the
Hot Wire of Motor
To Pushbutton
or Footswitch
Motor Contactor
Jumper “A” for Optional Up Limit Switch
Jumper “B” for Optional Down Limit Switch
Receptacle
(NEMA 5-15R)
Hydraulic
Power Unit
Motor
*NOTE: Ground wires from motor, power
cord and pushbutton or footswitch are not
shown for clarity. Attach all ground wires to
the enclosure ground lug.