This manual was current at the time of printing. To obtain the latest, most updated version,
please contact Presto Lifts Customer Service Department or go to our website: www.Pre-
stoLifts.com -- you will nd a complete list of current owner’s manuals to print.
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Page 3
Limited Warranty Policy
Presto Lis warrants this product to be free from defects in material or workmanship for the duration
of the warranty period. Warranty periods vary and begin on the date of shipment. For specic warranty
information, contact Presto Lis with the machine’s serial number.
Any claim for breach of this warranty must be received in writing by Presto Lis within the warranty
period. Warranties shall not cover failure or defective operation, caused by misuse, misapplication,
negligence or accident, exceeding recommended capacities, or any alteration or repair of the item purchased which has not been authorized by Presto Lis. Except as set forth herein, Presto Lis makes no
other warranties, express or implied, including THE WARRANTIES OF MERCHANTABILITY AND
OF FITNESS FOR A PARTICULAR PURPOSE, all of which ARE HEREBY EXCLUDED.
Presto Lis meets the labeling requirements of California’s Proposition 65. Presto Lis makes no warranty or representation with respect to the compliance of any product with other State or local safety
or product standard codes and any failure to comply with such codes shall not be considered a defect
of material or workmanship under this warranty. Presto Lis shall not be liable for any direct or consequential damages arising out of such non-compliance.
Presto Lis’ obligations under any warranty or for any other damages which may arise under any sale,
agreement, or contract, are limited to the replacement or repair of defective components at its factory
or another location at Presto Lis’ discretion. is is buyer’s sole remedy under any such warranty, sale,
agreement, or contract. Presto Lis will not be liable for consequential, incidental, exemplary, or punitive damages of any kind resulting from a breach of any warranty that it has provided or for breach of
any term of any sale, agreement, or contract. Any warranty may be altered only in writing by Presto
Lis.
All commodities, soware, or technology purchased from Presto Lis are subject to the export and
re-export control laws and regulations of the United States, including but not limited to the Export
Administration Regulations (“EAR”) and Department of the Treasury Oce of Foreign Asset Controls (“OFAC”) Regulations. Presto Lis expects all distributors and customers to comply with these
laws and regulations. Without limiting the foregoing, the distributor/customer cannot, without proper
authorization from the applicable United States Government Agency, export, re-export, or transfer
any commodity, soware, or technology purchased from Presto Lis, either directly or indirectly, to
any entity, country, or national of any country in breach of such laws and regulations. Furthermore,
Presto Lis expects that the distributor/customer shall indemnify and hold harmless Presto Lis from
and against any claim, proceeding, action, ne, loss, cost and damages arising out of or relating to any
noncompliance with export control regulations by distributor/customer, and distributor/customer are
expected to compensate Presto Lis for all losses and expenses resulting thereof, unless such noncompliance was clearly not caused by fault of the distributor/customer.
This manual attempts to provide all of the information
necessary for the safe and proper installation, operation
and maintenance of Presto Lifts Inc.'s MSeries Stackers. It is important that all personnel involved with the
installation, maintenance or operation of the stacker
read this manual. Where unique situations arise, that are
not covered in this manual call Presto Lifts for further
instructions. Additional manuals are available upon
request or on our web site at www.prestolifts.com.
The stacker has a nameplate that provides the load ca-
pacity ratings, serial number and model identications.
Please refer to these numbers when ordering parts or
requesting further information.
WHERE UNIQUE SITUATIONS ARISE, THAT ARE
NOT COVERED IN THIS MANUAL, CALL PRESTO
LIFTS SERVICE DEPARTMENT FOR FURTHER
INSTRUCTIONS.
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Page 6
Responsibility of Owners and Users
Inspection and Maintenance
The device shall be inspected and maintained in proper working order in accordance with Presto’s
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 qualied personnel in conformance with Presto’s instructions.
Operators
Only trained personnel and authorized personnel shall be permitted to operate PowerStak.
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 ex-
amined and a determination made by a qualied person as to whether it constitutes a hazard. All
items not in conformance with Presto’s specication shall be corrected before further use of the
PowerStak.
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.
Modications or Alterations
Modications or alterations to any Presto industrial positioning equipment shall be made only with
written permission from Presto.
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Page 7
S E C T I O N 2
SAFETY
The M Series stackers are very capable of causing serious injury or damage if adequate precautions are not
taken. By reading and following this manual, operator
injury may be prevented.
DO NOT INSTALL OR OPERATE THESE LIFTS
WITHOUT CAREFULLY READING THIS MANUAL. In order to provide for the safe operation of these
stackers, Presto Lifts Inc. has identied certain hazards
that may occur during the installation, maintenance and
use of these lifts.
WARNING!
• Do not perform any repair work on lifts if there is
a load on the platform or forks are in the raised or
lowered position.
• All personnel must stand clear of the lift when the
lift is in motion.
• Do not put hands or feet under forks or platform
while in motion.
• Do not put hands or feet on or near the mast
while the forks or platform is in motion.
• Do not stand, sit or climb on the lift.
• Do not exceed the load capacity.
• Place all loads centrally located on the lift forks
or platform.
• Do not place a load on a moving lift.
• Do not use the lift on soft, uneven or unstable
surfaces.
• Do not shock load the forks or platform. Materi-
als must be carefully placed rather than dropped.
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Page 8
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 identied which may
occur in the use of the machine, and there are appropriate 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 denitions referenced from ANSI Z535.4
- Product Safety Signs and Labels.
Safety Alert Symbols
These are the safety alert symbols.. They are used to alert you to potential physical injury hazards. Obey all safety messages that follow this symbol to avoid possible injury or death.
For use with DANGER signal word
(Red Background)
For use with WARNING signal word
(Orange Background)
For use with CAUTION signal word
(Yellow Background)
Signal Words
The meaning of different signal words as dened by ANSI Standard Z535.4 indicates the relative
seriousness of the hazardous situation.
DANGER indicates a hazardous situation which, if not avoided,
will result in death or serious injury.
(Red Background)
WARNING indicates a hazardous situation which, if not avoided,
could result in death or serious injury.
(Orange Background)
CAUTION, used with the safety alert symbol, indicates a hazardous situation which, if not avoided, could result in minor or
(Yellow Background)
moderate injury.
NOTICE is used to address practices not related to personal
injury.
(Blue Background)
SAFETY
INSTRUCTIONS
(Green Background)
SAFETY INSTRUCTIONS (or equivalent) signs indicate safetyrelated instructions or procedures.
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Page 9
S E C T I O N 3
INSTALLATION
INSTALLATION
When the stacker arrives on a pallet the following steps
are to be followed:
2). To lower lift, press release pedal down. Pressure on
release pedal controls speed of descent of load.
S E C T I O N 5
1. Through the use of a forklift or overhead hoist, pick
the stacker unit up taking into consideration the center
of gravity. The center of gravity of the unit should be
adequately supported.
2. Once the unit is lifted from the pallet by a couple of
inches, remove the pallet from under the stacker.
3. Follow the next sections to ensure proper operation.
S E C T I O N 4
OPERATION
METHOD OF OPERATION:
In order to operate the lift follow these operating procedures.
1). To raise the platform or forks, pump foot pedal until
platform reaches desired height.
MAINTENANCE
ROUTINE MAINTENANCE:
1). Grease wheels and casters at least once a month to
maintain easy roll of lift.
2). Do not overload the lift. All foot operated Presto
Manual Stackers have a maximum rated capacity
of 1000 lbs.
3). Use only hydraulic oil in the hydraulic system.
NEVER USE HYDRAULIC BRAKE FLUID.
Table 1 – Hydraulic Oil Specications
If the lift will be used at normal ambient temperatures, Presto Lifts supplies the unit with Conoco Super Hydraulic
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 Super Hydraulic 32:
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 caused by contamination in the oil.
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Page 10
S E C T I O N 6
S E C T I O N 7
SERVICE
To remove cylinder from lift:
1. Pump lift to above 12'' height and then prop platform or forks up to keep it in raised position.
2. Step on release pedal and push ram down by
hand until it reaches its lowest point.
3. Slip chain off pulley and remove pulley assembly.
4. Take off two bottom cap screws that hold cylinder in place and slide cylinder forward towards the
base legs of the lift. The cylinder can now easily
be removed.
To replace ram chevron set in hydraulic cylinder
assembly:
1. Remove hydraulic cylinder from lift and remove
Vent Plug (Part No. M427) and Oil Level Plug (Part
No. 428) and drain oil from cylinder.
2. Clamp pump body in vise, unscrew top hex nut
and remove outer cylinder.
3. Remove inner cylinder from pump making sure
not to distort or mar cylinder. Note: Do not use
pipe wrench.
4. Remove ram and replace chevron set.
TROUBLESHOOTING
If lift does not rise to full height:
It probably requires oil. (Check with lift in down
position.) To ll cylinder with oil, follow these
instructions.
There are two pipe plugs in the cylinder, Part No.
M427 (Vent Plug) and part No. M428 (Oil Level
Plug). Remove both plugs.
Put a good grade of hydraulic jack oil in the cylinder
through the top hole. When the oil reaches the level
of the bottom hole, replace both plugs. TOP PLUG
IS A BREATHER PLUG, BE SURE TO REPLACE
PLUGS IN THEIR PROPER PLACES.
If lift does not hold load, or tends to drift downward under a load:
Dirt particle may be obstructing seating of the
valve, allowing leakage.
If dirt particle is obstructing seating of the
valve:
Open release valve by pressing down on release
pedal. At the same time, pump foot lever three or
four strokes. Do this three or four times. Then place
some weight on the platform or forks and pump foot
lever until platform reaches its full height. Now,
lower lift six inches to a foot at a time. This should
dislodge dirt and lift should work properly.
5. Push ram into inner cylinder -- chevron end
last!
bly
2C104**Chain
3C106BLock Ring
4C106CChain Socket 3/4''
Adjustable
5C106AClevis Pin
** SPECIFIC MODEL NUMBER
REQUIRED WHEN ORDERING FOR
CORRECT CHAIN LENGTH
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Page 12
R E C O M M E N D E D C Y L I N D E R S P A R E P A R T S L I S T I N G
M SERIES STACKERS - PAGE 1
(VERSION A)
PART #DESCRIPTIONAVAILABILITYKIT#
M400**Hydrualic Cylinder Assy. Complete
M402Release LeverA
M403Release Lever PinA
M404Pump Plunger ClipA
M407N/A see 0457K
M410Pump BodyK1 & 2
N1200Pump Body PlugA1 & 2
M412Pump Check BallK1 & 2
M413Pump Check SpringK1 & 2
M414Pump Valve/Release GaketA1 & 2
M415Pump Valve BoltK1 & 2
M416Release Ball & PoppetK1 & 2
M417Release SpringK1 & 2
M419Release BoltK1 & 2
M420O Ring Reservoir SealK4 & 2
M422Pump Lever BracketA
M423Pump Lever Bracket PinsA
M424Ram O Ring SealK4 & 2
M425Cylinder NutA
M426**Outer CylinderN
M427Vent PlugA
N1200Oil Lever PlugA
M429Pump Lever Return SpringA
M430**Inner CylinderN
M431**RamN
M432Ram Guide Bearing PlateK4 & 2
M433-01Ram Chevron SetA4 & 2
M434Ram Chevron Set WasherK4 & 2
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Page 13
R E C O M M E N D E D S P A R E P A R T S L I S T I N G
M SERIES STACKERS - PAGE 2
(VERSION A)
PART # DESCRIPTION AVAILABILITY KIT#
M435 Ram Cup Nut K 4 & 2
M436 Foot Lever A
M437 Foot Lever Pad A
M438 Pump Intake Spring K 1 & 2
M439 Pump Intake Ball A 1 & 2
M440 Release Pin O Ring K 5 & 2
M441 Release Pin Back-Up Ring K 5 & 2
M442 Release Pin K 5 & 2
M443 Plunger Sleeve Gasket A 1-3 & 2
M444 Plunger Sleeve K 1-3 & 2
M445 Plunger O Ring A 1-3 & 2
M446 Plunger Nut A 1-3 & 2
M447 Plunger Washer A 1-3 & 2
M448 Plunger Cup A 1-3 & 2
N0040 Nut A
N0810 Bolt A
0457 Square Pump Plunger K 1-3 & 2
** SPECIFIC MODEL NUMBER REQUIRED
NOTE: A = AVAILABLE
N = NOT AVAILABLE; Must buy complete Cylinder
K = In a kit only.
Kit Number: 1 = M400-10
Kit Number: 2 = M400-20
Kit Number: 3 = M400-30
Kit Number: 4 = M400-40
Kit Number 5 = M400-50
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Page 14
F I G U R E 3:
M400-10 PUMP BODY COMPLETE
(VERSION A)
Tip: Removal of #22,
#23, & #24 through #7
portal
P/N M400-10 Pump Body Complete includes all items below.
P/N M400-30 Pump Plunger Assembly includes items 13 thru 21.
P/N M400-50 Release Pin Assembly includes items 22 thru 24.
See pages 7 & 8 for availability of individual items.
ITEM
No.
PART
No.
QTY DESCRIPTION
1M4101Pump Body
2M4201Reservoir Seal O Ring
3M4122Pump Check Ball
4M416A1Poppet
5M4171Release Spring
6M4142Gasket
7M4191Release Bolt
8M4391Pump Intake Ball
9M4381Pump Intake Spring
10M4151Pump Valve Bolt
11M4131Pump Check Spring
12M4111Plug
13M4431Gasket
Tip: Do not
swap #7 & #10.
They are machined differently
ITEM
No.
PART
No.
QTY DESCRIPTION
14M4441Plunger Sleeve
15M4451Plunger O Ring
16M4461Plunger Nut
17M4471Washer
18M4481Plunger Cup
19M407A1Plunger Guide Brg.
20M407B1 Seal O Ring
2104571Pump Plunger
22M4421Release Pin
23M4401Release Pin O Ring
24M4411Release Pin
25M410-D1Pin, Spring Roll
ITEM #QTYDESCRIPTION
11Lock Up-Lock Down
21Name Plate
31Do Not Stand On Forks
41Presto Lifts (Verticle Logo)
61Load Center
71Help Line
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Page 25
PARTS
Standard parts may be returned with a 20% restocking fee or $35.00 net, whichever
is greater. Modied or custom-engineered parts are not returnable. Unfortunately,
due to potentially concealed damage, all sales of electrical assemblies are nal.
QUALITY ISSUES
Should you feel there is a quality problem, please contact the seller to ask questions and gather information on how to rectify the issue. Presto Lift Inc. reserves
the right to determine potential credits, as a result of factory defects, based on its
inspection of the merchandise.
GENERAL
All products shipped from our factory have passed Quality Assurance inspection and
testing. The carrier of choice has signed for, and accepted the product in new working
condition. The customer should inspect to ensure it is not received damaged, has no
concealed damage or is not incomplete. Parts orders are determined to be complete
based upon Presto Lift, Inc. inspection sheets and carrier shipping weights.
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Page 26
RETURN MATERIALS AUTHORIZATION POLICY
Presto Lifts provides the Return Materials Authorization (RMA) Policy, for specic models, as a
courtesy to our distributors in the event they do not receive what they ordered. If a customer wishes
to return a Presto Lifts product, please contact the Customer Service Department and request an
RMA number. This request must be made on or before the fteenth calendar day following the
date of Presto Lifts’ invoice for the merchandise. Not all units are returnable. Quantity orders and
special designs cannot be returned under any circumstances. Presto Customer Service reserves the
right for nal judgment on all product returns.
The RMA number must appear on the outside of any packaging material for a return to be accepted
and processed by Presto Lifts. Customers shipping returns from the Continental US, Canada, or
Mexico have thirty (30) days from date of RMA issue to have the product arrive at Presto Lifts’
facility. All merchandise must arrive Free on Board at Presto Lifts’ facility or the shipment will be
refused and returned to the sender. All credits are issued less restocking and refurbishing charges,
regardless if the merchandise was damaged in transit.
Return addresses: please refer to your RMA for the address to which your product should be returned.
Presto Lift Inc.
715 Highway 77
Manila, Arkansas 72442
Telephone: 800-343-9322
Fax: 888-788-6496
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Page 27
Ordering Replacement Parts
Presto 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 Lifts will not be responsible for equipment failures
resulting from the use of incorrect replacement parts or from unauthorized modications to the unit.
Presto 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 on the
angle support at the top of the cylinder.
To order replacement parts, please call the Presto 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 Parts Department
50 Commerce Way
Norton, MA 02766
Telephone: 800-343-9322
FAX: 888-788-6496
Email: parts@PrestoLifts.com
www.PrestoLifts.com
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