TECHNICAL SPECIFICATIONS
ELECTRO-HYDRAULIC HEAVY DUTY MOBILE LIFTING SYSTEM
PATRIOT MODEL M18
1. GENERAL DESCRIPTION
1.1. The purpose of these specifications is to define a mobile wheel contact lifting system to elevate large buses, trucks, and other vehicles for the purpose of inspection, maintenance, servicing and cleaning.
1.2. One lifting system shall consist of at least one primary jack and up to nine secondary jacks. The primary jacks shall have the capability of being used as a primary column or a secondary column. The lift system shall be designed to permit combining multiple sets without modifications to the electrical or mechanical configuration of the jacks. The lift system shall be designed as to be able to handle up to 10 columns in a lifting system (or 180,000 lbs.), with the possibility of operating one column, one pair or all of the columns together.
1.3. Control cable shall be disconnected from control boxes at both end of the cable. Mobile lift systems with control cables "hard-wired" into the control box shall not be acceptable due to the difficulty in replacement and loss of operating flexibility.
1.4. Entire lift system shall have been approved and certified by an NRTL to comply with the standard ANSI\ALI ALCTV-1998 (Automotive Lifts – Safety Requirements for Construction, Testing and Validation) and the standard ANSI/UL 201 1st Edition – 1997 (Standard for Safety for Garage Equipment). Proof of certification as well as testing report showing testing at the certificated capacity of the lift must be submitted with bid at the time of bid.
1.5. Manufacturer shall be a member, in good standing, of the Automotive Lift Institute (ALI), a professional association of lift manufacturers.
1.6. Column shall be structurally designed as to have motor and hydraulic pump assembly positioned at the bottom of the column to promote greater stability while moving the column. Lift systems with motors mounted on the top of the column shall not be accepted due to their inherent top-heaviness and possibility of tipping while moving.
1.7. Each column shall be equipped with a 2HP TEFC motor of North American Manufacturer. The motor shall be available in 208/230/440/460/480/575 V, 3 Phase, 60 HZ. Motor bearings shall be sealed for life and pre-lubricated for a minimum of 5 years use.
1.8. The floor pressure requirements for each column shall not be greater than 50 psi.
1.9. The lift shall be suitable for outdoor use on any level surface that meets the loading requirements stated above.
1.10. The lift maintenance shall be limited to monthly and yearly visual checks to insure that the hydraulic fluid levels are correct and that lift safety systems are functioning properly.
2. LIFTING CAPACITY
Each jack shall have a normal nominal rated capacity of 18,000 lbs. per jack; 36,000 lbs., per pair, or 72,000 lbs. per set of four; or 108,000 lbs. per set of six columns.
3. LIFTING HEIGHT
The lifting height of each fork shall be no less than 69 inches as measured from the ground to the bottom of the lifting fork.
4. LIFTING SPEED
The lifting speed shall not be less than 66 inches per minute either in the ascent mode and 60 inches per minute in the descent mode.
5. CONSTRUCTION
5.1. Frame shall be constructed of 3/4" thick, high strength fork lift mast channels to ensure structural integrity and provide a smooth lift guidance system. Formed steel columns shall not be acceptable as they do not afford the required strength and rigidity.
5.2. The base shall be of a rectangular design with square rear corners so as to provide maximum rigidity and balance during lifting operation
5.3. Lifting column shall not weigh more than 1,050 lbs.
5.4. Individual Jack Dimensions:
Base width - 43 inches
Base depth - 47 inches
Column Height
with carriage in low position - 96 ½ inches Maximum
with carriage in high position - 145 7/8 inches Maximum
5.5. Lifting Carriage:
5.5.1. Lifting carriage shall ride on maintenance free, double sealed, self lubricating steel ball bearing rollers. Nylon rollers or sliding blocks shall not be accepted because they are not reliable.
5.5.2. The distance between the wheel contact forks shall be adjustable from 13 inches to 23.5 inches. Sleeve adapters shall not be acceptable as they may slip off of the lifting carriage causing a vehicle to fall.
5.5.3. Fork length shall not be less than 12 inches.
5.5.4. The clearance between the lifting column and the back of fork shall be 9 inches minimum.
5.5.5. The clearance between the carriage extension and the back of the fork shall be 11 inches minimum.
5.5.6. Carriage shall have a 1/4-inch clearance from the floor when in the low position, to facilitate moving the column when power is cut-off.
6. PALLET JACK MECHANISM
6.1. The lifting columns shall be easily moved by one person using a pallet jack system with two front wheels consisting of 6" steel encased bearing rollers and dual 8" thermo set resin coated steering wheels at the rear of the jack. The rise of the pallet jack shall be 2 inches minimum.
6.2. The pallet jack mechanism shall have a loop type handle and shall be raised and lowered using a three position lever with raise, lower and neutral position. T-bar handles are not acceptable since they do not facilitate proper handling of the column.
6.3. Pallet jack mechanism shall have an overload valve that will automatically lower the jack if the operator attempts to raise a vehicle with the pallet jack in the raised position. The overload valve shall be set at the factory and adjustable in the field as necessary.
7. CONTROLS
7.1. The various functions of the mobile lifting system shall be controlled from the control panels on the columns. The control system shall have been tested and approved by a Nationally Recognized Testing Laboratory as established by OSHA to be compliant with the requirements of UL 201.
7.2. Lifting system shall be operable from primary and secondary columns.
7.2.1. Each Primary panel shall include:
A NEMA 4 rated control enclosure.
A disconnect switch to control source power. Switch shall be capable of being locked in the off position for operator safety.
A pilot light to indicate that the power is turned on.
A phase relay to assure proper phasing of the supply power
A transformer to convert incoming supply voltage to 110V which is supplied to the PC. The PC then supplies 24V to the control circuit. Transformers shall have fuse protection
A spring loaded three position selector switch for selecting ALL, PAIR or SINGLE operation.
An ADDRESS switch to designate column number.
Two dead-man type push buttons for UP and DOWN operation.
A PARK button to engage the mechanical lock.
A red FAULT light to indicate a fault in the lift operating system.
A PC to monitor the proper operation of the lift and provide motion control.
Red LED lights to with diagnostic chart to aid in fault trouble shooting.
Thermal relay to protect the motor in the event of an overload.
Fuse protection to protect the cables in the event of a short circuit.
A red mushroom palm type emergency stop button to allow immediate manual shut down of the entire lifting system.
A power cable with a minimum length of 40 feet.
7.2.2. Each Secondary panel shall include:
A NEMA 4 rated control enclosure.
A transformer to convert incoming supply voltage to 110V which is supplied to the PC. The PC then supplies 24V to the control circuit. Transformers shall have fuse protection
A spring loaded three position selector switch for selecting ALL, PAIR or SINGLE operation.
An ADDRESS switch to designate column number.
Two dead-man type push buttons for UP and DOWN operation.
A printed circuit board to monitor the proper operation of the lift and provide motion control.
Thermal relay to protect the motor in the event of an overload.
Fuse protection to protect the cables in the event of a short circuit.
A red mushroom palm type emergency stop button to allow immediate manual shut down of the entire lifting system.
The control cables to each column shall be a closed loop design. Each control cable shall have a minimum length of 35 feet and have a detachable plug connector at each end of the cable.
7.3. The primary column control panel shall have the capacity to be used as a primary panel or a secondary panel without electrical modification. An ADDRESS dial on each primary column shall allow the column to be designated any column number 1 through 10 (a maximum of 10 columns per set may be used). A primary column may be designated as a primary by selecting number 1 or as a secondary by selecting numbers 2 through 10. The secondary columns may be designated as any column number 2 through 10 using the ADDRESS dial. It shall be possible to form a set of lifts using any combination of primary and secondary columns. For example a set of 4 may consist 1 primary and 3 secondary columns or 4 primary columns with three of them being designated as columns 2 through 4. The control system shall allow the flexibility of breaking up sets to be used as sets of two in geographically separate areas or combining sets to create a set of up to ten without modifying the electrical system.
7.4. Individual operation of each column shall be achieved by simultaneously turning and holding the spring loaded operation mode selector switch to the SINGLE position and pressing the UP or DOWN button on that column. Lifts that use operation mode selector switches that are not spring loaded shall not be accepted due to the possibility of inadvertent switching by other operators in the shop.
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.5. Paired or axle operation shall be achieved by simultaneously turning and holding the spring loaded operation mode selector switch on either of the two columns on the axle to the PAIR position and pressing the UP or DOWN button on that column. Lifts that require a complicated sequence of pressing reference buttons on multiple columns shall not be accepted.7
.6. Paired or individual operation shall be permitted at any time during the lifting cycle. It shall be possible to switch from SINGLE, PAIR, or ALL operation in any order regardless of the height position of the columns.7.7. The control system shall utilize a printed circuit board and micro-processor to ensure proper operation of the lift. The printed circuit board shall have LED lights with a diagnostic chart to facilitate trouble shooting.
7.8. At 220V, 3 phase, the lift system shall not draw more than 15 Amps per pair of columns, 30 Amps for a set of 4 columns or 45 AMPS for a set of 6 columns.
8. DRIVE MECHANISM
8.1. The drive system shall be hydraulic drive and shall permit lifting without any pulsation, jerks, or unsteady lifting. Lifting shall be smooth. Hydraulic system shall comprise an electrically-powered pump, flow control valves, and a fluid reservoir.
8.2. Hydraulic lifting cylinder shall be of piston type to prevent leakage in case of piston damage. Cylinder casing shall be mounted to the column base and the piston shall be encased in the carriage to protect it from debris and damage.
8.3. The removal and installation of the lifting cylinder shall take place in less than 30 minutes per column.
8.4. Hydraulic fluid shall be contained in high pressure hydraulic hoses with 6 to 1 bursting pressure rating.
8.5. Jacks shall be equipped with mechanical end stops at the top and bottom of the lifting stroke.
8.6. The hydraulic unit shall be equipped with a dual valve system for smooth equalization.
8.7. Hydraulic lifting cylinder shall be equipped with a wiper to remove dirt, dust and other contaminants on the plunger.
8.8. Each hydraulic cylinder shall be equipped with a velocity fuse to prevent decent in the event of a major fluid leak.
8.9. Piston shall be chrome plated for low abrasion conditions and to prevent slip-stick problems.
9.
Safety Devices9
.1. Each column shall have an automatic multi-position mechanical locking system. This system shall incorporate a spring loaded latch that will automatically engage when the lift is not in operation. The column shall have a minimum of 21 lock positions beginning at the height of 7 inches and spaced every 3 inches for the entire stroke of 69 inches. This safety device shall be totally independent from the lifting drive system. Systems that utilize non-load bearing "safety nuts" shall not be approved since they are integrated with the lifting drive itself.9.2. The mechanical lock shall be released by a solenoid valve when the lift is in lowering.
9.3. Each lock shall have a manual pull type override lever to allow the lock to be manually released so that a vehicle maybe lowered in the event of a power outage. This lever shall be easily accessible without disassembling any lift components.
9.4. The lifting system shall incorporate multiple redundant safety systems. The lift shall support the vehicle in the event of a mechanical failure, motor failure, hydraulic failure or loss of electrical service by incorporating electrical, mechanical and hydraulic safety systems.
9.5. Motive UP and DOWN push buttons shall be of a dead-man type so that constant pressure must be maintained on the button by the operator in order to operate the lifts.
9.6. Thermal protection relays shall be provided to protect the motors against overload.
9.7. Cable hold down bracket shall be of steel construction to provide safe storage of cable when the lift is not in operation.
9.8. A pilot light on the master control box shall indicate when the system is powered.
9.9. A phase relay shall be provided to automatically deactivate the system in event of a phase reversal in the power supply.
9.10. A motion control system shall monitor the up and down motion of the lifting carriages and shall attempt to correct any difference of + ½ inch in the traveling height of the carriages. If the difference in speed cannot be corrected, the system shall fault and stop all the jacks when the difference between the lifting carriages becomes greater than 2 ½ inches.
9.11. LED lights shall indicate when the system is in the fault mode and shall provide indication as to which fault has occurred.
9.12. Each control panel whether it is designated as a primary or secondary column control panel shall have a mushroom type emergency stop button which stops the movement of all of the columns in the set. The emergency stop switch must be palm operated and shall require clockwise motion in order to be released.
9.13. All control voltage shall be no greater than 24 volts.
10. WARRANTY
10.1. Manufacturer shall provide a minimum warranty of:
Two years on defective parts with one year of labor provided.
Three years on the hydraulic pump.
Five years on the hydraulic cylinder
Life time on replacement seals (parts only)