Presto Lifts XS36-15 Use and Care Manual
Contents
1. Presto worldwide material handling and ergonomic solution XS amp WXS Series Scissor Lifts Installation Operation and Service Manual Model Number Serial Date placed in service 4 IMPORTANT READ CAREFULLY BEFORE INSTALLING OR OPERATING LIFT Part orders are subject to a 50 minimum charge February 2015 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 PrestoLifts com you will find a complete list of current owner s manuals to print PRESTO OWNER S MANUAL Page 2 XS amp WXS SERIES SCISSOR LIFTS CONTENTS SECTION 1 ii li oi uns u Z Z uu E E sua 4 Responsibility of Owners and Users 5 Safety Alert Symbols and Signal Words 6 SECTION 2 SAT OLY EE E EE T E E T E 7 SECTION 3 CALE GTO Os 2 656A 7 A Uncrating and Inspection I J Ji iii E E E E u E E 7 l5 a 7 DI s li PI 6 2 ca 4a AC 8 E Testing the Lift with NO Load 8 SECTION 4 ODO SE 10101121 shade uuu gate tacneeuteaneereian2. ity of coil burned out PRESTO OWNER S MANUAL Page 10 LIFT DOES NOT RISE TO FULL HEIGHT Check for leaks or shortage of oil Maintain the proper oil level To check oil level follow these instructions IF THE LIFT TENDS TO CREEP DOWNWARD UN DER A LOAD a speck of dirt may be obstructing the seating of the valve and allowing leakage To correct follow these instructions e Raise lift to full lifting height and then lower it to lowest point of lift It may be necessary to do this five or six times In lowering the lift lower it in stages that 1s lower the lift six inches to a foot at a time This will dislodge the dirt and lift will operate properly SECTION 6 SERVICE REPLACING CYLINDER SEALS 1 Lower the lift to its lowest position Then lift the top to its over center position and secure 2 Disconnect the negative battery terminal 3 Disconnect the hydraulic hose from the cylinder and cap the line to prevent hydraulic fluid loss Loosen the set screws holding the cylinder pin Remove the cylinder pin Lift the cylinder out of the lift NOTICE Hold the cylinder securely while removing the pin to prevent it from falling to the floor 7 Clamp cylinder securely at the base end 8 Completely collapse cylinder piston Push gland into the cylinder 1 8 3 16 10 Remove retaining ring 11 Remove piston rod piston and gland from cylin der 12 Remove rod nut piston and gland 13
3. 1 Check for signs of damage especially to the electrical and hydraulic components 2 Check all connections for tightness Check for any bent or damaged metal parts 4 Check base frame for flatness NOTICE When moving the lift do not attempt to pick it up by the table top The lift should be picked up by its base only U9 B INSTALLING Before starting be sure that the electrical system is wired and is in full compliance with local electrical codes and ordinances Read all of the instructions prior to starting the lift 1 Handle Assembly a Portable lifts have the push handles removed for ease of shipping Handles should be inserted in the holders until they bottom out then tighten set screws on each holder with an Allen wrench 2 Floor Installation a Electrical connections must be made according to the electrical schematics and information contained in Section 3C and in compliance to local codes and ordinances C ELECTRICALS 1 The motors on XS amp WXS Series Scissor Lifts are special intermittent duty motors with high pull up torques These motors require heavier duty electrical controls than standard motors 2 Wiring circuits must conform to local codes and must be installed by a licensed electrician 3 Lifts are pre wired at the factory for motor direction and performance XS amp WXS SERIES SCISSOR LIFTS All wiring must conform to local codes and must be performed by licensed electr
4. e Do not exceed maximum rated load f Maintain load center of gravity within 6 of the center of the portable lift and 8 for stationary lifts PRESTO OWNER S MANUAL Page 9 SECTION 5 MAINTENANCE Generally the XS amp WXS Series Scissor Lifts require very little maintenance Reasonable care will result in excellent trouble free performance Never go under or service lift with a load on the table Always service the lift in a down position A ROUTINE MAINTENANCE All routine maintenance should be performed monthly and can be performed on the standard XS amp WXS Se ries Scissor Lifts in a lowered height position Before performing any maintenance shut the power off Then raise the top over its center position secure in place and perform the routine listed 1 through 7 1 Check oil level Add oil if necessary 2 Check rollers for signs of wear Replace if dam aged 3 Check snap ring and shield Replace if damaged 4 Check hydraulic lines for damage or leaking Replace if damaged 5 Check for oil spots on the floor Trace leaks to the proper fitting and tighten 6 Check wiring for damage Replace immediately if any sign of wear is evident 7 Bearings on these lifts are permanently lubricated and require no servicing Look for any signs of wear B TROUBLESHOOTING MAINTENANCE LIFT WILL NOT MOVE 1 No operational noises a Check power switch fuses and overloads b Check voltage
5. 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 Deflection It 1s the responsibility of the user purchaser to advise the manufacturer where deflection may be critical to the application Repairs All repairs shall be made by qualified personnel in conformance with Presto s instructions Operators Only trained personnel and authorized personnel shall be permitted to operate the equipment Before Operation Before using the device the operator shall have e 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 qualified person as to whether it constitutes a haz ard All items not in conformance with Presto s specification shall be corrected before further use of the equipment During Operation The device shall only be used 1n accordance with this owner s manual Do not overload Ensu
6. returnable Unfortunately due to potentially concealed damage all sales of electrical assemblies are final QUALITY ISSUES Should you feel there is a quality problem please contact the seller to ask ques tions 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 PRESTO OWNER S MANUAL Page 17 XS amp WXS SERIES SCISSOR LIFTS RETURN GOODS AUTHORIZATION POLICY Presto Lifts provides the Return Goods Authorization RGA Policy for specific 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 RGA number This request must be made on or before the fifteenth 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 unde
7. Locking checks that hold the load in either direction are standard PPE 18 ed tit 5 L1 L Z T I T i i i i A B l l THERMAL RELIEF aa aA IS RR C VN yy F THERMAL RELIEF VALVE ce ee VALVE SET AT 4200 4800 PSI N SET AT 4200 4800 PSI M a I L L I Q Q i ee E NES UP RELIEF VALVE eee DN RELIEF VALVE SET AT 3400 PSI _ st AT 600 PS THe g v Table 2 Hydraulic Oil Specifications lf 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 0F use aircraft grade hydraulic oil Type 15 aircraft hydraulic oil is recommended The following are equivalent to Conoco Super Hydraulic 32 TYPE MANUFACTURER NUTO H32 EXXON MOBIL AMOCO AW32 CHEVRON AMOCO CO 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 PRESTO OWNER S MANUAL Page 15 XS amp WXS SERIES SCISSOR LIFTS 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 o
8. NSI Standard Z535 4 indicates the relative seriousness of the hazardous situation DANGER indicates a hazardous situation which if not avoided A D A N G F R wlll result in death or serious 1nJury Red Background WARNING indicates a hazardous situation which if not avoided could result in death or serious injury Orange Background Yellow Background CAUTION used with the safety alert symbol indicates a haz ardous situation which if not avoided could result in minor or moderate injury NOTICE is used to address practices not related to personal NOTICE ew Blue Background SAFETY SAFETY INSTRUCTIONS or equivalent signs indicate safety INSTRUCTIONS related Instructions or procedures Green Background PRESTO OWNER S MANUAL Page 6 XS amp WXS SERIES SCISSOR LIFTS ECTION 2 SAFETY The XS amp WXS Series Scissor Lifts are very power ful lifts capable of doing large amounts of work They contain scissor legs that are hydraulically actuated and are capable of causing serious injury or damage if adequate precautions are not taken DO NOT INSTALL OR OPERATE THESE LIFTS WITHOUT CAREFULLY READING THIS MANU AL In order to provide for the safe operation of these scissor lifts Presto Lifts Inc has identified certain haz ards that may occur during the installation maintenance and use of these lifts For safety reasons the standard XS amp WXS Series Scissor Lifts are designed to be servic
9. Remove and replace seals and wipers 14 Assemble piston and gland to piston rod XS amp WXS SERIES SCISSOR LIFTS 15 16 17 18 19 20 21 22 Assemble rod nut to piston rod and torque to 100 ft lb Lubricate piston and seals and install cylinder Insert retainer ring Install cylinder and hydraulic lines Fill reservoir a For the lifts serviced in lowered position lower tabletop completely Cycle lift 2 3 times adding oil if necessary Recheck reservoir oil level B REPLACING LEG ROLLERS Seal kits are listed on page 14 a For standard lifts lower lift to 1s lowest pOSI tion Then lift the top to its over center position and secure b For lifts with an oversize platform it may be necessary to prop up the base frame slightly to allow the platform to hinge over center Disconnect electrical power Raise the leg assembly approximately 2 with a pry bar and support with block of wood 2 x 4 Remove retainer clips shield and rollers Clean and lubricate axle Replace with new rollers shields and clips Lower the tabletop completely PRESTO OWNER S MANUAL Page 11 XS amp WXS SERIES SCISSOR LIFTS Table 1 TROUBLESHOOTING MAINTENANCE ELECTRICAL motor noise or battery and charger Lift will not move with motor noise Low voltage at motor Battery low Oil starvation Check oil reservoir Motor overheats Excessive cycling rate Check cycle rate 15 cycles per hour maxi mum L
10. at motor motor may have failed 2 Operational noises a Lift may be overloaded or jammed Check load weight and obstructions b Motor 3 phase single phasing Check voltage at motor terminals c Motor 3 phase reversed Reverse 2 lines XS amp WXS SERIES SCISSOR LIFTS d Motor 1 phase low voltage Check voltage at motor terminal e Oil shortage reservoir low or oil line failure Repair or replace f Down valve open check wiring remove and run lift 3 Motor overheats a Excessive cycle rate 15 per hour max b Low voltage check voltage at motor c Oil starvation check filter in reservoir LIFT OPERATING SLOWLY 1 Up cycle a Oil starvation check filter in reservoir b Oil viscosity oil 1s too heavy or too thin c Air in cylinder cycle lift with no load 2 times and hold down button for 20 seconds after bottoming out on each cycle 2 Down cycle single acting cylinders a Down valve dirty remove and clean Check oil condition replace if dirty b Pinched hydraulic lines c Oil viscosity is too heavy 3 Lift raises then slowly lowers without power a Down valve dirty Remove and clean b Leaking hydraulic lines or fittings check for telltale oil spots c Check valve in pump may not be seating Requires new pump 4 Lift will not lower when energized a Down solenoid faulty Check voltage may be low or wrong voltage for coil Check continu
11. ed or repaired in the lowered position If per formed properly this will greatly reduce the possibility of injury Lifts with oversize table tops require special handling See Section 5 Maintenance SAFETY INSTRUCTIONS Do not work under the table All personnel must stand clear of the lift when the lift 1s in motion Do not put hands or feet under the lift table Do not stand sit or climb on the lift Do not use the lift on soft uneven or unstable sur faces Do not exceed the load capacity Do not place a load on a moving lift e Place loads in the center of the table and secure loads properly Do not perform any repair work on lifts if there is a load on the platform or with the table 1n a raised position SECTION 3 INSTALLATION A UNCRATING AND INSPECTION Upon receipt of the XS amp WXS Series Scissor Lifts inspect the equipment completely to determine if there is any shipping damage and that the lift is complete Presto Lifts Inc tests and inspects every piece of equip ment prior to shipment If damage is apparent a freight claim must be filed with the freight company Do Not PRESTO OWNER S MANUAL Page 7 use the lift if there appears to be any damage With the lift in a collapsed position check the following NOTICE Lifts with oversize table tops must not be over ex tended since doing so may disassociate the cylinder base from its socket See Section 5 Maintenance
12. escatheveeletinwsestusneveseiennicemias 8 As Mohd of Op Lo TC TY cctarcnssaemosunsascotoeseemessmsgsantaasactosapsaceateosaemessmapteasessacwenepseosases 8 B Operating nstr ctions ond 04 165521926 g6otg1246606 1x09 o910114 11 46906004102009619 049 9628001908 4101ox go 9 SECTION 5 Dili K 0206161612006 chackcsamacyaaresatecsammeseasnshaceccanieasians 9 Ae CO 111C VIAL CO AMC 5 055 sngenesansoreatoesaemesemspsantaesact onan saceatessaatesemapteatessaceenenseasises 9 B Troubleshooting MaIntenance 9 SECTION 6 S jO ass rasan sns S n SS ca E 10 A Replacme Cyundor CaS uuu uuu uuu u sesnesuatedoaien deaumseacanesssnsaswasesteben 10 B Replacing Leg Rollers l1 ORDERING REPLACEMENT PARTS 16 RIES POC KING POLICY 0 024022022662262022100162220600240 66623206000 EEEE EERI 0020305002 17 RETURN GOODS AUTHORIZATION POLICY 18 WV ALITA PI ce 0h E E E E E S ah Sa 19 LIST OF FIGURES Fig 1 Electrical Diagram LLS V uuu uuu ll aa aE aE 13 IO O anons DI E u E S 14 Fig 5 Hydraulic Schematic All models 15 LIST OF TABLES Table 1 Troubleshooting Maintenance Electrica
13. icians Do not attempt to modify or change the electrical circuit Any alterations will cause damage to the pump and possible physical injury Only authorized personnel should service the electrical system 4 For the XS or WXS Series Scissor Lifts a dedi cated circuit of 20 amps or larger will suffice to operate the lift D HYDRAULICS 1 Use only hydraulic oil for the lift The lift has been supplied with Conoco Super Hydraulic 32 When add ing fluid use only the recommended oils See Table 1 2 Before using the lift check the hydraulic oil level and add oil if necessary Check fittings for tightness If the plug is not installed you may damage the pump NOTICE XS amp WXS Series Scissor Lifts are designed for normal factory environments Where below freez ing conditions may exist special fluid must be used Contact Presto Lifts for further information when freezing conditions exist E TESTING THE LIFT WITH NO LOAD 1 Before testing the lift clear the area of any loose material Be sure the lift has no obstruction above it or on any side 2 Using the controls provided briefly operate the lift 5 10 seconds If the lift begins to rise with a hum ming sound and functions properly continue to the full upright position NOTICE If the lift does not rise immediately or there is any operational problem stop it immediately Before continuing check the rotation of the pump and mo tor and the voltage at motor
14. l 12 Taole2 Hydraulic oil SpeciRNcationS u LLA LULU a a een 15 PRESTO OWNER S MANUAL Page 3 XS amp WXS SERIES SCISSOR LIFTS ECTION 1 INTRODUCTION This manual attempts to provide all of the information necessary for the safe and proper installation opera tion and maintenance of Presto Lifts Inc s XS amp WXS Series Scissor Lifts It is important that all personnel involved with the installation maintenance or opera tor of the scissor lift 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 scissor lift has a nameplate that provides the load capacity ratings serial number and model identifica tions Please refer to these numbers when ordering parts or requesting further information The Presto Lifts XS amp WXS Series 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 LIFTS FOR FURTHER INSTRUC TIONS The XS amp WXS Series Scissor Lifts is designed for inplant nonhazardous location use only These units are not for personnel lifting PRESTO OWNER S MANUAL Page 4 XS amp WXS SERIES SCISSOR LIFTS Responsibility of Owners and Users Inspection and Maintenance
15. ove or after it has reached its up or down limits This will cause damage to the pump and controls XS amp WXS SERIES SCISSOR LIFTS B OPERATING INSTRUCTIONS In order to operate the lift follow these operating pro cedures Read and understand all the Instructions before operat ing If the lift has modifications or accessories read and understand their functions 1 Load the lift correctly Portable lifts Place the load on the center of the table top The load center of gravity must be within 6 of the lift table top center and equally distributed over 80 of the table Stationary lifts Place the load on the center of the table top The load center of gravity must be within 8 of the lift table top and equally distributed over 80 of the table If the load is unstable or may become unstable fasten it into position 2 Operate the lift a To raise the lift press and hold the up button b To lower the lift press and hold the down button c Release the button to stop the lift 3 Wait until the lift has come to a complete stop before unloading the lift 4 Stand clear of lift when operating it in order to avoid injury a Do not stand sit or climb onto the lift b Do not load or unload a moving lift c If the lift fails to move or exhibits strange move ments or sound stop immediately Do not operate the lift until it has been checked and repaired d Read understand and obey all warning labels
16. ow voltage Check voltage at motor Up cycle slow Check and fill reservoir sary Air in cylinder system Purge system by cycling several times to full on and eon Down cycle slow Ho Oil viscosity too heavy replace Oil contaminated replace Lift raises then lowers slowly Leaking fitting Check fittings and lines for telltale oil spills PRESTO OWNER S MANUAL Page 12 XS amp WXS SERIES SCISSOR LIFTS ELECTRICAL DIAGRAM 115 AC FIGURE 1 KYDRAUL IC POWER UNIT MOTOR FUSED DISCONNECT BY OTHERS X INDICATES WIRE CONNECTION IN START RELAY THE ENCLOSURE RELAY TERMINAL LOCATIONS KANG CONTROL 4 FOOT CONTROL USE SAME COLOR COOE XS amp WXS SERIES SCISSOR LIFTS Page 13 PRESTO OWNER S MANUAL FIGURE 2 XS amp WXS COMPONENTS DIAGRAM Standard Replacement Parts 115 1 60 Power Only For serial numbers beginning with V call Presto Lifts Parts Department for parts information CYLINDER 1001 171 03 XS24 10 XS24 15 WXS24 10 WXS24 15 na XS36 10 XS36 15 WXS36 10 WXS36 15 AC MOTOR PUMP 1001 092 01 XS24 15 WXS24 15 AND RESERVOIR 1001 092 02 XS24 10 WXS24 15 1001 092 11 XS36 15 WXS36 15 1001 092 12 XS36 10 WXS36 110 PRESTO OWNER S MANUAL Page 14 XS amp WXS SERIES SCISSOR LIFTS FIGURE 3 HYDRAULIC SCHEMATIC ALL MODELS BI DIRECTIONAL PUMPS These pumps are driven by reversible motors and are primarily used to power double acting cylinders in both directions
17. r any circumstances Presto Cus tomer Service reserves the right for final judgment on all product returns The RGA number must appear on the outside of any packaging material for a return to be ac cepted and processed by Presto Lifts Customers shipping returns from the Continental US Canada or Mexico have thirty 30 days from date of RGA 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 PRESTO OWNER S MANUAL Page 18 XS amp WXS SERIES SCISSOR LIFTS Presto Lifts Limited Warranty Policy Presto Lifts warrants all of its products against defects in the welded structural frame and if ap plicable scissor legs from faulty material and workmanship for a period of five 5 years from the date of invoice All other components have a limited warranty against defects in faulty material and workmanship for a two 2 year period from the date of invoice date of invoice and 30 day limited warranty on labor Please note that prior authorization from Presto Lifts is required on all war
18. ranty or the operation or failure of this product Presto Lifts makes no representation that this product complies with local state or federal safety product standards codes Should this product fail to comply in any way with those codes it shall not be considered a defect of materials or workmanship Presto Lifts shall not be held liable for any damages resulting from noncompliance It is the dealer s responsibility to exercise this limited warranty This limited warranty is provided to the original purchaser defined as the original end user and is nontransferable This constitutes the complete and final agreement involving Presto Lifts and limited warranty obligations for products PRESTO OWNER S MANUAL Page 19 XS amp WXS SERIES SCISSOR LIFTS Presio ae pn MEAS LET PRESTO MEET THOSE NEEDS Call Presto Sales for stock or customized lift inquiries 800 343 9322 Email sales prestolifts com ETR
19. ranty work There are no implied warranties of any kind more specifically there are no warranties of mer chantability or fitness for any particular purpose Presto Lifts sole warranty shall be as set forth in this limited warranty Presto Lifts will elect to repair or replace a defective component without charge if any compo nents should become defective within the limited warranty period Proof of purchase is required for warranty The charge for shipping the defective component is the responsibility of the buyer and must be accompanied with an RMA number The shipping charge to return the component to the buyer is the responsibility of Presto Lifts Inc This limited warranty does not cover labor expense for removal or reinstallation of components after thirty days This limited warranty shall not cover among other things damages resulting from foreign matter or water failure to provide reasonable and necessary maintenance and if ap plicable use of product while charger is plugged into an AC outlet or failure to follow operating instructions The limited warranty is not valid for damage resulting from negligence accident unreasonable use abuse or misuse exceeding data plate capacities or altering the product without Presto Lifts authorization Presto Lifts expressly disclaims and excludes any liability for consequential incidental indirect or punitive damages or financial loss to people or property resulting from any breach of war
20. re that all safety devices are operational and in place Modifications or Alterations Modifications or alterations to any Presto industrial positioning equipment shall be made only with written permission from Presto PRESTO OWNER S MANUAL Page 5 XS amp WXS SERIES SCISSOR LIFTS SAFETYALERTSYMBOLSAND 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 identified 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 definitions 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 haz ards 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 gt P 2 Signal Words The meaning of different signal words as defined by A
21. riginal equipment Presto Lifts will not be responsible for equipment failures resulting from the use of incorrect replacement parts or from unauthorized modifications 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 find these numbers on the name plate This plate is located within the scissors mechanism To order replacement parts please call the Presto Parts Department Parts are shipped subject to the following terms e 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 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 service PrestoLifts com www PrestoLifts com PRESTO OWNER S MANUAL Page 16 XS amp WXS SERIES SCISSOR LIFTS PARTS Standard parts may be returned with a 20 restocking fee Modified or custom engineered parts are not
22. terminals again briefly PRESTO OWNER S MANUAL Page 8 operate the lift If the lift does not move smoothly with a humming sound stop and review the proce dures in the section on troubleshooting 5B 3 After raising the lift completely lower the lift It should move slowly and smoothly with a humming sound If the lift operates properly raise and lower the lift and stop at different levels to get a good perspective on the lift s operations and movements SECTION 4 OPERATION A METHOD OF OPERATION All XS amp WXS Series Scissor Lifts are provided with a special relief valve and are factory preset for the maxi mum Safe capacity of the lift Activating and holding the up switch will energize the motor The motor is attached to a positive displacement pump that draws hydraulic fluid from the reservoir and trans fers it under pressure to the cylinder This forces the piston forward and the scissor legs to separate and raise the platform releasing the up button will stop the lift A check valve between the pump and piston holds the table in position Depressing and holding the down switch will energize a solenoid that allows the oil from the cylinder to return to the reservoir through a preset flow control This allows the lift to lower smoothly and at a controlled speed NOTICE Do not attempt to change the setting on the pres sure relief valve Do not maintain the up or down button energized if the lift fails to m
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