Presto P4 User Manual

P4

Level Loader

Model Number ___________________
Serial # _________________________
Date Placed in Service _____________

IMPORT ANT : READ CAREFULLY
BEFORE INST ALLING OR OPERA TING LIFT

Part orders are subject to a $50 miminum charge

May 2006

INTRODUCTION

The P4 Level Loader is designed to allow faster, safer, and easier pallet loading and
unloading. Pallets may be loaded or unloaded in a single step, using a fork truck, or
hand pallet truck. Using a pushbutton or footswitch control, the operator can position
boxes or containers at a convenient working height. This allows workers to load or
unload without bending or stretching.

The unit includes a photo eye toe guard feature. A photo eye is positioned near the
front of the unit. If the operator’s toes block this photo eye, the unit stops immediately .

This manual contains instructions on the safe and proper installation, use, and
maintenance of a P4 Level Loader. Please be sure that this manual is available to
anyone who uses or services the P4 unit. Be sure that everyone who uses the P4 unit
has read this manual.

P4 Level Loaders may be used in a wide variety of industrial settings. The
instructions included in this manual are not necessarily all-inclusive, because
Presto Lifts cannot anticipate all conceivable or unique situations.

In the interest of safety, please read this whole manual carefully. Please
understand the material in the manual before you install, use, or service the P4
unit. If you have any questions about the instructions in this manual, please
contact your dealer or Presto Lifts Inc.

Presto Lift’s product warranty is shown on the rear cover of this manual. This instruction
manual is not intended to be or to create any other warranty , express or implied,

including any implied warranty of merchantability or fitness for a particular
purpose, all of which are hereby expressly excluded. As set forth more specifically

in the product warranty, Presto Lift’s obligation under that warranty is limited to the
repair or replacement of defective components, which shall be the buyer’s sole remedy ,
and Presto Lift shall not be liable for any loss, injury , or damage to persons or property ,
nor for any direct, indirect, or consequential damage of any kind resulting from the P4
Level Loader.

2 PRESTO P4 LEVEL LOADER OWNER’S MANUAL

TABLE OF CONTENTS

INTRODUCTION...............................................................................................................2

SAFETY ........................................................................................................................4

INST ALLA TION INSTRUCTIONS ......................................................................................4

Preparation...................................................................................................... 4

Positioning the Unit .........................................................................................4

Electrical Connections .................................................................................... 5

Testing.............................................................................................................6

OPERATING INSTRUCTIONS ........................................................................................7

Safety Instructions .......................................................................................... 7

Loading the Unit .............................................................................................. 8

Raising the Platform ........................................................................................ 8

Lowering the Platform..................................................................................... 9

MAINTENANCE AND TROUBLESHOOTING ...............................................................10

Hazards .........................................................................................................10

Routine Periodic Maintenance......................................................................11

Troubleshooting Check List .......................................................................... 12

Repacking the Cylinder ................................................................................. 15

Adjusting the Chain Tension ......................................................................... 15

Ordering Replacement Parts ........................................................................16

LIST OF FIGURES

Fig. 1 Safety labels ....................................................................................................5

Fig. 2 Pinch points.....................................................................................................6

Fig. 3 Load the unit correctly..................................................................................... 7

Fig. 4. Electrical diagram ...........................................................................................8

Fig. 5. Hydraulic diagram ........................................................................................... 9

Fig. 6. Parts identification — Front view.................................................................... 12

Fig. 7. Parts identification — Rear view..................................................................... 13

Fig. 8. Hydraulic pump .............................................................................................13

Fig. 9. Down valve ....................................................................................................14

Fig. 10 Hydraulic oil specifications ........................................................................... 16

PRESTO P4 LEVEL LOADER OWNER’S MANUAL 3

SAFETY

The safety of all persons installing, using, servicing, or working near the P4 Level Loader unit is of
paramount concern to Presto. The P4 Level Loader unit is a powerful machine with moving parts,
and is CAPABLE OF CAUSING PERSONAL INJURY IF PROPER PRECAUTIONS ARE NOT
T AKEN.

Therefore, throughout this manual, Presto has identified certain hazards which may occur in the
use of the P4 Level Loader unit, and provided appropriate INSTRUCTIONS or PRECAUTIONS
which should be taken to avoid these hazards. In some cases, Presto has also pointed out the
CONSEQUENCES which may occur if Presto’s instructions or precautions are not followed. Presto
uses the following system of identifying the severity of the hazards associated with its products:

PLEASE READ AND FOLLOW THIS INSTRUCTION MANUAL, INCLUDING ALL SAFETY
INSTRUCTIONS AND PRECAUTIONS, CAREFULLY AND COMPLETELY.

DANGER: Immediate hazard which will result in severe personal injury or death.
WARNING: Hazard or unsafe practice which could result in severe personal injury or death.
CAUTION: Hazard or unsafe practice which could result in minor personal injury or

property damage.

INSTALLATION INSTRUCTIONS

Preparation

1. Before you start to install the unit, 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. The unit should be placed indoors, or
protected from the weather.

WARNING!
Protect the 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 can create

sparks. Don’t install the unit in an

area where flammable gases may be
present.

4. You will need these tools to install the unit:

• A crane or lift truck that can lift the unit safely .
If you plan to lag the unit in place, you will
need these tools:

• Shims and lag bolts.

• A masonry drill and bit to drill the holes for the
lag bolts.

• Wrenches to fit the lag bolts

• Grouting material to fill any spaces under the
frame of the machine.

Positioning the Unit

1. Remove the shipping material. Unbolt the
lag screws at the lag angles on the corners.
(If you plan to bolt the unit in place, leave the
lag angles attached to the frame of the unit.
Otherwise, unbolt and remove the lag
angles.)

2. On the front of this manual, write down the
model number , serial number , and date the
unit is placed in service. You can find the
model number and serial number on the
name plate.

4 PRESTO P4 LEVEL LOADER OWNER’S MANUAL

3. During shipping, the platform of the unit is
raised 5-1/2", and this platform is supported
on two pins. This allows a space under the
platform. When you want to move the unit,
put a pallet jack under the platform and lift
the unit. This is the best way of moving the
unit.

CAUTION!

If you place the unit on a surface
which is not firm or level, the
unit may shift as it operates. Y ou
may be hurt, or the unit or load
may be damaged.

CAUTION!

Always raise the platform and insert
the pins before you move the unit. If
you try to move the unit in another
way , the frame may be bent. Be sure
to remove the pins before you
operate the unit. If you do not do
this, the unit may be damaged. Once
the unit has power, raise the plat form
just a bit to take the load off of the
pins, then remove the pins.

4. The unit has an 10' power cord. Choose a
location where the cord can reach an outlet
easily , without stretching the cord tightly.

5. Move the unit into position, supporting the
platform of the unit. Place the unit on a firm,
level surface.

6. The unit may be operated without bolting
the frame to the floor. However, the
mounting arrangement is more secure if
you use lag screws. Bolt the unit to the
floor using four lag bolts. These should run
through the lag angles at the corners of
the base frame. Insert and tighten the lag
bolts to secure the unit. Grout under the
base rails to prevent vibration and distortion
of the base frame.

Electrical Connections

DANGER!
The unit uses a power supply of 115
volts AC. This voltage can kill you.
Don’t work with the electrical parts
unless you are a qualified electrician.

PRESTO P4 LEVEL LOADER OWNER’S MANUAL 5

1. The unit is supplied with a power cord which
is 10' long. You must provide a two-prong
outlet within this distance from the unit. The
circuit should be provided with a 20 amp
circuit breaker or fuse.

WARNING!

To avoid fire danger, be sure to
provide a circuit breaker or fuse.

2. The standard unit has a foot switch
assembly. Position the control box in a
convenient location near the unit.

3. Check the level of the hydraulic fluid in the
tank. In order to check the level, lower the
unit completely and unplug the power cord.
Remove the rear cover on the unit. When
the unit is fully lowered, the oil should be 1/
2" to 3/4” (13 to 19 mm) below the top of the
tank. Add oil as necessary.

2. Warn others to stay away from the unit.
Operate the unit through its full range of
travel. The unit should rise smoothly with a
quiet humming sound, and lower smoothly
and quietly. Raise and lower the unit a few
times to check the lifting action.

WARNING!

As the platform moves up and clown,
“pinch points” are created at the
places shown in Fig. 2. If you are
standing too close to the unit 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 unit is moving.

3. Test the unit with the rated load. If the unit
does not rise, and you hear a loud squealing
noise, the pressure relief valve is operating.
Contact Presto Lifts for instructions.

Testing

1. Clear the area around the unit. Remove any
loose wires, lumber, or other materials
which might get in the way of the unit as it
raises or lowers.

WARNING!

Don’t continue to use the unit 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

6 PRESTO P4 LEVEL LOADER OWNER’S MANUAL