248H IIspecs #5253 - CraneNetwork

Hydraulic SystemHydraulic pumpsTwo variable displacement piston pumpsoperating at 4,000 psi (281.24 kg/cm2)power travel, main drum, auxiliary drum,third drum, and boomhoist functions. Twofixed displacement gear pumps operatingat 3,000 psi (211 kg/cm2) power swing,counterweight lowering, and machine jackfunctions. One fixed displacement gearpump operating at 1,210 psi (85 kg/cm2)powers pilot control system, clutches,brakes, and pump controls.Hydraulic reservoir42 gal. (159 L), equipped with sight levelgauge."Fine Inching" pump control modeSpecial fine metering pump settingselectable from the operator's cab allowsvery slow movements for precision work.Main hoist, auxiliary hoist, boomhoist, thirddrum, and travel are all supplied with thisstandard feature.Hydraulic filtrationTen micron, full flow line filter furnished incontrol circuit. All oil is filtered prior toreturn to sump tank.Relief valvesEach function is equipped with reliefvalves to protect the circuit from overloador shock.Brake valvesTravel circuit is provided with brake valvesfor all terrain capability.Hydraulic motorsMain hoist drum, auxiliary hoist drum,boomhoist, swing, and travel are poweredby axial piston motors.Counterbalance valvesUpper - Hoist motors are equipped withcounterbalance valves to provide positiveload lowering and prevent accidental loaddrop when hydraulic power is suddenlyreduced.Lower - Travel motors equipped withcounterbalance valve to prevent overspeeding of motors when traveling downan incline.Principal Operating FunctionsControl systemRemote controlled hydraulic servo formain drum and auxiliary drum. Mechanicallinkage controls swing. Function speed isproportional to lever movement. Levers areadjustable for operator comfort.Load hoisting and loweringMain and auxiliary hoist drums are drivenby individual axial piston motors andreduction gearing. Load hoisting orlowering is provided by actuating orreversing a hydraulic motor. The controllever provides two speeds for hoisting andlowering. Hoisting or lowering speeds areproportional to lever movement.Freefall - The incorporation of powerhydraulic controlled, two-shoe clutchesallow freefall operation of the main andauxiliary hoist drums for high cycle craneand duty cycle application. Mode selectionswitch on control panel allows operator toselect the most productive operationmode.Load hoist drumsMain (front) and auxiliary (rear) hoistdrums are 19" (.48 m) root diametergrooved for 1" (25 mm) wire rope. Mountedon anti-friction bearings.Third operating drum - Optional; 12-1/2"(.32 m) grooved drum lagging, mounted inboom base section.Drum clutchesSpeed-o-Matic power hydraulic two-shoeclutches; internal expanding, lined shoes.Clutch spiders are splined to shafts; clutchdrums are integral with hoist drums.Swing systemIndependent, hydraulic swing is driven bytwo axial piston motors through a gearreduction system; free swing when lever isin neutral position.Load hoist clutches - Front and rear maindrums - clutch drums 30" (.76 m) diameter,6-1/2" (.17 m) width.Swing brake - Spring applied, hydraulically released; controlled by button onswing control lever.Drum brakesExternal contracting band type; operatedby foot pedal equipped with a lockinglatch. Operator may select automatic brakemode* (spring applied, hydraulicallyreleased), which will apply brakes whenthe hoist control lever is in the neutralposition.Swing lock - Mechanically controlled, twoposition locking mechanism.*When in the automatic brake mode, the LS248H ll meets all OSHA requirements forpersonnel handling.Drum rotation indicatorsStandard for front and rear drums. Audibletype indicators.Drum locking pawlStandard for front and rear drums; electrically actuated and prevents drum rotationin a lowering direction.Anti two-block systemStandard - A switch mounted on the boompeak activates a buzzer to warn theoperator of a two-block condition andsimultaneously disengages hoist functionwhile applying the hoist brakes.— 5 —Optional - 360 locking mechanismavailable to meet New York City code.Swing speed - Variable from 0 to 2 rpm.Boomhoist/lowering systemIndependent, hydraulic boomhoist isdriven by an axial piston motor through agear reduction system. Boom hoisting orlowering is performed by actuating orreversing the motor. Boomhoist speed isinfinitely variable. Boomhoist speed from0 to 70 boom angle is 90 seconds.Boomhoist drumSingle grooved lagging 15" (.38 m) rootdiameter.Boomhoist drum locking pawlElectrically operated.Boomhoist brakeSpring applied, hydraulically released,multiple disc type brake. Brake is automatically applied when control lever is inneutral position.

Boomhoist limiting device - Restrictshoisting boom beyond recommendedminimum radius.Base section20' (6.10 m) long; boomfeet on 55"(1.40 m) centers.Electrical system24 volt negative ground system with two12-volt batteries. Standard lighting systemincludes: two 70 watt headlights mountedon machine front and one interior cab light.Boom extensionsAvailable in 10', 20', 30' and 40' (3.05,6.10, 9.14 and 12.19 m) lengths withappropriate length pendants.Operator's cabFull vision, modular compartment withsafety glass panels. The completelyindependent cab is insulated againstnoise and vibration. Sliding operator'sdoor, swing up roof window. Standardequipment includes: heater, air conditioner, defroster, windshield wiper, drychemical fire extinguisher, sun visor,bubble-type level, fuel gauge, tachometer,hydraulic temperature gauge, engine oilpressure gauge, coolant temperaturegauge, and service monitor system.Machinery cabHinged doors (one on right side, two onleft side) for machinery access. Equippedwith rooftop access ladder, electricwarning horn and skid resistant finish onroof.CatwalksStandard on right and left sides. Catwalksremove for reduced travel width.BailPinned to revolving frame. Seven sheavesare provided for 16 part boomhoist wirerope reeving. Sheaves mounted on"lifetime sealed" anti-friction bearings.Counterweights"A" upper ctwt. - 22,730 lb. (10 310 kg)"AB" upper ctwt. - 67,470 lb. (30 604 kg)"ABC" upper ctwt. - 96,430 lb. (43 741 kg)Side frame ctwts. - see side frame auxiliaryctwt. description under Crawler Mountingon page 3.Boom and JibTubular boomTwo-piece basic boom 50' (15.24 m) longwith open throat top section. Boom 80"(2.03 m) wide, 68" (1.73 m) deep atconnections. Alloy steel round tubularcords 4" (.10 m) outside diameter. Maximum boom length is 280' (85.34 m).Boom connectionsIn-line pin connections.Boom top sectionOpen throat; 30' (9.14 m) long.Boompoint machinerySix 21" (.53 m) root diameter sheavesmounted on "lifetime sealed" anti-frictionbearings.Hydraulic boomfoot pin removalStandard; Speed-o-Matic controlled;located between mounting lugs on boombase section.Boom live mast30' (9.14 m) long; supports boomhoistbridle and boom pendants. Required for allboom lengths. May be used as short boomfor assembling and disassembly of sideframes and boom, but is not intended forgeneral crane service. Refer to operator'smanual for boom live mast lifting capacities.JibTubular; two-piece basic jib 30' (9.14 m)long; 32" (.81 m) wide, 24" (.61 m) deep atcenterline of connections. Alloy steeltubular chords 2-1/4" (57 mm) outsidediameter.Base section - 13' 3" (4.04 m) long.Jib extensions - Available in 10' (3.05 m)and 20' (6.10 m) lengths with appropriatelength pendants.Jib connections - In-line, tapered pins.Tip section - 15' (4.57 m) long; equippedwith single peak sheave 21" (.53 m) rootdiameter, heat treated and mounted onanti-friction bearings. Anchor provided atpeak of jib tip section for two-part loadhoist wire rope (whipline) connection.Maximum jib length permitted - 100'(30.48 m). All jib lengths may be mountedat 5 , 15 , or 25 offset to boom.— 6 —Jib mast17' 10" (5.44 m) long, mounted on jib basesection. Two deflector sheaves mountedwithin mast to guide whipline; mounted onanti-friction bearings. Two equalizersheaves mounted on top of mast - one forjib frontstay line, one for jib backstay line.Jib staylines - Front and back staylines.Back staylines vary in length dependingon degree of jib offset from boom centerline; back staylines attached at bottom endof boom top section.Jib stops - Telescoping type; pinned fromjib mast to boom top section and from jibmast to jib base section.Auxiliary EquipmentBoom angle indicatorPendulum type; mounted on boom basesection. Electronic type readout on loadindicator.Hook blocksBlocks, or weighted ball with swivel hook,optional - refer to price list.Rated capacity limiterStandard; PAT DS-350 rated capacitylimiter, programmed with multiple charts,provides the operator with: main boomlength, main boom angle, jib angle, jiblength, operating mode, load radius, boomtip height, anti-two block indicator, prewarning light, audible alarm, overloadlight, and load on hook.Swing alarmStandard; audio/visual warning devicesignals when upper is swinging.Lifting slingsFor handling side frames and auxiliaryside frame counterweights.

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Link-Belt Construction Equipment CompanyLexington, Kentuckywww.linkbelt.com Link-Belt is a registered trademark. All rights reserved. Copyright 2002. We are constantly improving our products and therefore reserve the right to change designs and specifications.— 8 —

—1— 200-Ton (181.50 metric ton) Hydraulic Lattice Boom Crawler Crane Specifications General dimensions feet meters Basic boom length 50 15.24 Overall width of machine with 44" (1.12 m) track shoes 22.5 6.85 Overall width of cab w/catwalks both sides 13.644.15 Overall width of cab less catwalks 10.953.34 Litho in U.S.A 3/02