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PRODUCT INFORMATIONPENTALIFT DOCKLEVELERS2946 Larimer St. Denver, CO 80205303-295-1100 / 800-373-7693FAX 303-295-2464Email info@snyderequipment.comwww.snyderequipment.com
Series HD Hydraulic Dock LevelerOperating FeaturesStructural Features*High-strength, 4-way safety tread platedeck and lip assembly; 55,000 psi yield.Full-width, self-cleaning, heavy-wallhinge tube; 70,000 psi yield.Gussets on lip and headboard hinge maximize support.Deep, 8” high, one-piece headboard with bridgedgaps; radii on all inside corners for maximumstrength; 50,000 psi yield.Structural, precision-formed “C” beams; 65,000psi yield. Specially designed beams allow Pentalift tocreate and build the deck support with optimalstrength-to-weight ratio for a dock leveler. Utilizing10 beams assures an even load distribution and maximum deck support.Central deck beam for addedsupport of three-wheeled vehicles.Full-width, structural channeltailboard and one-piece, full-widthrear hinge complete with heavysteel gussets. Pentalift’s unique,welded assembly provides a boxsection (Fig. 5) for superior support.Rear frame assembly features fiveFig. 5vertical structural members with eight pointsof even support for the full-width rear hinge.Heavy-duty front frame provides full-width,cross-traffic support and superior building aesthetics.Night locks prevent unauthorized entry whenoverhead door is locked on top of dock leveler. Self-retracting, hydraulic lip cylinder is standard on all models for fullyhydraulic operation.Top-fed, forward-positioned hydrauliclift cylinder.Telescopic toe protection assures totaldock attendant safety. Lower sectionfeatures a “bend relief” tomaximize strength.Fixed rear hinge remains flush withthe rear of the pit to eliminate potentialpinch points and surface obstructions.Design allows 4” of lateraldeck compensation to accommodatecanted truck/trailer beds.Hydraulic power unit incorporatesinternal filtration system and 1 1/2 hpTENV motor.Integral, posi-lock maintenance strutsupports both deck and lip assemblyduring maintenance and service.Fig. 6. *Model HD6830 Lift Cylinder Placement Fallsafe is a situation in which a hydraulic velocity fuse locks the cylinderand deck in position should a truck prematurely depart while a forklift is stillpositioned on the leveler.Fig. 10Balanced Design forStructural HarmonyOther dock leveler manufacturers boast of individualcomponents as though they were unrelated to eachother in strength. Little thought is given to the overallstructural balance of the combined load-bearing components.Many dock leveler manufacturers fail to realize that, inmany respects, the combination of structural components is similar to a chain and a chain is only as strongas its weakest link.Through the use of state-of-the-art finite elementanalysis software, Pentalift components are designedand sized to maintain structural balance and harmonythroughout, assuring maximum dock leveler life byeliminating any weak links.Self-Retracting LipA self-retracting lip is an important safety and performance feature. The Pentalogichydraulic manifold facilitates the self-retracting lip on Pentalift “HD” Series dock levelers.Master Control PanelsMaster Control Panels are available to suitvarious applications and combinations ofdock equipment. Master control panels areused to simplify and harmonize the operationof the loading dock equipment, increase safety, reduce field-wiring costs and conservewall space at the loading dock. The dockequipment that is typically interlocked is anycombination of: hydraulic dock leveler, vehicle restraint and safety light system, overheaddoor and/or inflatable dock shelter.Fig. 8Fig. 9Fig. 11Fig. 74Other ManufacturersPentaliftOther manufacturers position their lift cylinderas illustrated above (Fig. 8). During a fallsafecondition, with the front tires of the forkliftpast the upper cylinder support point, a dangerous “teeter-totter” situation occurs. Theback of the deck is forced upwards and out ofthe rear frame. In addition, the positioning creates a mechanical disadvantage during fallsafe(1” stroke 4” deck drop).Other cylinders, with the chrome plated pistonfacing downward, are prone to surface damageand chipping, leading to hydraulic seal failure.For most effective support, Pentalift’s liftcylinder is securely positioned at the junctionof the deck and the structural headboard (Fig.9). The base of the cylinder is connected to astructural cross member. During a hydraulicfallsafe situation (incorporating non-adjustablevelocity fuse) the forklift will be completelysupported between the cylinder position andthe rear frame. All generated forces are downward, in the manner all dock levelers aredesigned to accept load forces.The Pentalift lift cylinder is positioned correctly, away from debris found in the pit. Itsposition provides a superior mechanicaladvantage when raising the deck.Pentalogic Hydraulic ManifoldOperating every hydraulic function with onlytwo moving parts, the Pentalogic hydraulicmanifold revolutionized dock leveler hydrauliccontrol circuitry. Conventional hydraulic dockleveler control valve circuitry is comprised ofseveral individual function valve assemblies.These assemblies are constructed from manysub components, increasing the potential ofhydraulic component failure and oil leaks.Utilizing only two moving components, thenon-adjustable Pentalogic hydraulic manifoldeliminates all concerns related to on-siteadjustment, oil leaks or hydraulic componentfailure.Fig. 12Conventional hydraulic dock levelers, yieldablelip circuits utilize an “in line” pressure reliefvalve, maintaining the lip in the extendedposition. Once a vehicle departs, the decklowers with the lip remaining in the extendedposition. The next incoming vehicle will impactthe extended lip and any excessive force willpush the lip assembly back into the pendantposition. In addition, a conventional hydrauliccircuit can cause the lip to get “caught on” aportion of the incoming truck (Fig. 12),resulting in extensive damage to the vehicle,dock leveler and cargo.Fig. 13On truck departure, the Pentalogic hydraulicmanifold allows the lip assembly to gentlyretract into the pendant position prior to thearrival of the next incoming vehicle (Fig. 13).The Pentalogic hydraulic manifold assures thatthe lip is always pendant behind the protectivebumpers. Units equipped with automaticreturn-to-stored-position, work in conjunctionwith the self-retracting lip (eliminating falsesignals common with other makes), to returnthe deck to the safe, stored position.5
Series MD Mechanical Dock LevelerOperating FeaturesStructural Features*High-strength, 4-way safety tread platedeck and lip assembly: 55,000 psi yield.Full-width, self-cleaning, heavy-wallhinge tube; 70,000 psi yield.Gussets on lip and headboard hinge maximize support.Deep, 8” high, one-piece headboard with bridged gaps;radii on all inside corners for maximum strength;50,000 psi yield.Structural, precision-formed “C” beams; 65,000 psi yield.Specially designed beams allow Pentalift to create andbuild the deck support with optimal strength-to-weightratio for a dock leveler. Utilizing 10 beams assures aneven load distribution and maximum deck support.Central deck beam for added supportof three-wheeled vehicles.Full-width, structural channel tail boardand one-piece, full-width rear hingecomplete with heavy steel gussets.Pentalift’s unique, welded assembly provides a box section (Fig. 14)for superior support.Fig. 14Rear frame assembly features fivevertical structural members with eight points of evensupport for the full-width rear hinge.Heavy-duty front frame provides full-width, crosstraffic support and superior building aesthetics.Night locks prevent unauthorized entry when overheaddoor is locked on top of dock leveler. Positive lock lip maintains extension of the lip, then automatically retracts once the truck departs.Lip is yieldable if contacted in extended positionduring truck/trailer positioning.Lip-assist spring assembly counterbalancesthe weight of lip for smoother extension andretraction.Mechanical safety legs limit platform free fall inthe event of premature truck departure; includesbelow level control.Computer optimized cam profile reduces“walkdown” forces.Full-range telescopic toe protection; upper andlower sections feature a “ bend relief” to increasestrength.Heavy-duty, adjustable lift springs.Safe, easy maintenance; only three adjustmentpoints, conveniently located at the front of theleveler, eliminate the need to enter the pit.Fixed rear hinge remains flush with the rear ofthe pit to eliminate potential pinch points andsurface obstructions. Design allows 4” of lateraldeck compensation to accommodate cantedtruck/trailer beds.*Model MD6830The “Easy Float” Hold-down Represents a Major Advancement in theMost Important Component of a Mechanical Dock Leveler6Other dock leveler manufacturers boast of individualcomponents as though they were unrelated to eachother in strength. Little thought is given to the overallstructural balance of the combined load-bearingcomponents.Many dock leveler manufacturers fail to realize that,in many respects, the combination of structural components is similar to a chain and a chain is only asstrong as its weakest link.Effect of Canting Deck on Hold-downThe Hold-down assembly in a mechanical dock leveler has two main functions; to hold the leveler in position on the back of the truck,and to allow the dock leveler to “float” up and down with the suspension of the truck as it rises and lowers during unloading and loadingoperations. In some instances this “floating” movement is over 12”. Every time a lift truck drives in or out of the truck, a tremendousshock load is delivered to conventional ratchet and pawl type Hold-downs. This is why conventional Hold-downs are a continual sourceof breakdown problems with broken teeth on both the ratchets and pawls. When the Hold-down on a mechanical dock leveler breaks, theentire dock leveler is inoperable.In 1983, Pentalift invented and patented its “Easy Float” Hold-down. Pentalift was the first in the industry to incorporate a brake bandand high strength, nylon strap to eliminate the extreme stresses and impact forces that cause conventional Hold-downs to fail. Here’s howPentalift’s “Easy Float” Hold-down operates compared to conventional ratchet and pawl-type Hold-down assemblies.“Easy Float” Hold-downControlled, automaticcompensation of thebrake assembly, under alight upwards force(approximately 200 lb.),allows Pentalift’s dockleveler deck to floatgently upwards andmaintain positive lipcontact with the truckbed. The brake banddesign assures that theautomatic compensationforce will remain constant throughout theentire operating range.The high-strength nylonstrap absorbs shock loads because of its semi-elastic properties.Balanced Design forStructural HarmonyThrough the use of state-of-the-art finite elementanalysis software, Pentalift components are designedand sized to maintain structural balance and harmonythroughout, assuring maximum dock leveler life byeliminating any weak links.Fig. 15 Ratchet and Paul Hold-downA float spring compensates fortruck bed movement. Thespring’s resistance becomesprogressively greater as thedeck rises. Once the float springis fully compressed, the severeupward force results in substantial Hold-down damage.Accumulated over-workingweakens the spring, creating“bounce” during rollover. Theshock load stresses during floatbear directly on the hardenedmetal ratchet bar and the rigidpawl teeth. (Fig. 16).These damaging conditions,Fig. 16 common during normal usage,cause aggravating ratchet andpawl teeth failure. Some designs release the pawl from the ratchet once thefloat spring has been compressed. The teeth automatically release and resetunder spring pressure, causing premature ratchet and pawl failure.Fig. 18Truck beds are not always level with the floor in which the dock leveler is installed. Thisis the result of trucks loaded on one side or because of laterally uneven driveways.Therefore, the dock leveler deck must be able to cant (tilt sideways) to compensate forthe out-of-level truck bed.Fig. 19Fig. 17Fig. 17Pull Ring Force Required to Release HolddownHold-downs are released manually to allow thedeck of the dock leveler to rise for use or to berestored after use when the truck is still at thedock. This is done by pulling a Hold-downrelease ring installed in the dock leveler deck.The pull force required to release the Holddown is always a concern.The release forces for a ratchet and pawl Holddown can be up to 100 lb. when it is compensating for upward deck float; even under bestcase conditions 20-30 lb. of pull force isrequired. The “Easy Float” Hold-down onlyrequires pull force of 8 lb. throughout theentire operating range of the dock leveler.Proven benefits of the Pentalift “Easy Float”Hold-down design result in maximum component life, and minimized risk of discomfort andinjury to the dock attendant.Fig. 20Ratchet and Pawl Hold-downRigid steel ratchets and pawls connect theHold-down from the deck to the frame of thedock leveler. The repetitive twisting forcesplaced on these components during the canting of the deck results in premature wear,breakage, costly downtime, expensivereplacement parts and a compromise of docksafety.Fig. 21“Easy Float” Hold-downA flexible high strength nylon strap connectsthe Hold-down from the deck to the frame.The inherent properties of this strap allow itto easily compensate for the canting deck.7
Roll-Off Stop Lip Dock LevelersThe proven performance and reliability of hydraulic operation with roll-offprotection for enhanced loading docksafety.Pentalift’s “HDRS” Series of Roll-Off Stop Lip hydraulic docklevelers features all of the design, structural and operational benefits of the “HD” Series of Pentalift hydraulic dock levelers withthe added safety enhancement of a roll-off stop lip.The roll-off stop lip is a formidable barrier designed to prevent lifttruck roll-off whenever there is no truck/trailer in position at aloading dock door.The roll-off stop lip also serves to protect roll-up doors on positioned trucks/trailers from impact damage.Roll-Off Stop LipFig. 22Pentalift’s offset hinge design automatically provides a barrier when the lip is in the vertical position.The full width, self-cleaning, piano-style hinge ensures ongoing, reliable performance with low maintenance.By eliminating intricate sliding mechanisms, Pentalift’s“HDRS” Series levelers maintain the roll-off stop featureat all times, even during higher risk, below level, end-loading operations.Fig. 23Model SelectionPentalift’s “HDRS” Series Roll-Off Stop Lip hydraulic dock levelers are available in a range of standard widths and lengths withcapacities from 25,000 to over 100,000 lb.Options pour-in place designinterlock to vehicle restraint systeminterlock to overhead doorfoam insulated deck18” lip length20” lip lengthother options availableFig. 24Consult a Pentalift Sales Representative for additional information or equipment recommendations.NOTE: Some photos may reflect products with optional features. All Pentalift Equipment products are subject to designimprovement through modification without notice.PENTALIFT EQUIPMENT CORPORATIONPO Box 1510 Buffalo NY U.S.A. 14240-1510PO Box 1060 Guelph ON Canada N1H 6N1CP 1219 Pointe-Claire QC Canada H9S 5K7Website: www.pentalift.comPhone: (519) 763-3625 Fax: (519) 763-2894Phone: (519) 763-3625 Fax: (519) 763-2894Phone: (514) 426-0219 Fax: (519) 763-2894Product Bulletin No. 0301D001Printed In Canada
Pentalever Mechanical Edge of DockEasy-Lift ActivationLow effort activationLip automatically locks when deck retractedFeaturesSpecification Operating range of 5”above and below level Heavy-duty steel bumperblocks complete withmolded rubber bumpers Grease fittings Rated capacities 20,000,25,000, or 30,000 lb.Mechanical Edge of Dock(s) shall be the Pentalever modelEDML , as manufactured by Pentalift EquipmentCorporation. Edge of Dock(s) to be lever operated and torsionspring assisted. Edge of Dock(s) to have a deck width of”. The rated capacity shall be lb. Lip shallbe of high tensile steel construction, designed to project 11-1/2”beyond the face of the bumpers. Edge of Dock(s) shall automatically return to stored position when truck/trailer departs. Whennot in use, the activating lever will store safely to the side of thedeck, eliminating the potential for loss or theft. Two moldedrubber bumpers and two heavy-duty steel bumper blockswill be provided to achieve an overall projection of 16”.Edge of Dock(s) shall have Pentalift gray finish.Options Pour-in place designActivating lever stores safely out of theway and is not prone to loss or theft.Ease of positioningModelNumberSpanDeck/Lip WidthOverallWidthShippingWeight (lb.)RatedCapacity (lb.)EDML662027 1/2”66”96”49520,000EDML662527 1/2”66”96”52525,000EDML663027 1/2”66”96”54030,000EDML722027 1/2”72”102”53020,000EDML722527 1/2”72”102”58025,000EDML723027 1/2”72”102”60030,000Hydraulic Model (EDH)EDH models have a single cylinder and a self-contained power unit for reliable operation.Consult a Pentalift Sales Representative for additional information or equipment recommendations.NOTE: Some photos may reflect products with optional features. All Pentalift Equipment products are subject to designimprovement through modification without notice.PENTALIFT EQUIPMENT CORPORATIONPO Box 1510 Buffalo NY U.S.A. 14240-1510PO Box 1060 Guelph ON Canada N1H 6N1CP 1219 Pointe-Claire QC Canada H9S 5K7Website: www.pentalift.comPhone: (519) 763-3625 Fax: (519) 763-2894Phone: (519) 763-3625 Fax: (519) 763-2894Phone: (514) 426-0219 Fax: (519) 763-2894E-mail: EOD@pentalift.comProduct Bulletin 0204D002Printed In Canada
PENTALIFT DOCK LEVELERS 2946 Larimer St. Denver, CO 80205 303-295-1100 / 800-373-7693 FAX 303-295-2464 Email info@snyderequipment.com . Balanced Design for Structural Harmony Other dock leveler manufacturers boast of individual components as though they were unrelated to each other in strength. Little thought is given to the overall .
