Joystick Position

8/14/2019 Joystick Position

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Technical Description SR712 BMWelding Tractor

Engine output 120 kW/163 HP

Operating weight 16.9 17.5 t/37,300 38,600 lbHydrostatic travel drive with electronic steering control

The Better Machine.

litronic


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The Advantage: Total economical efficienc

The decisiveeconomical factorsof the SR 712 BM:

1. The construction machine enginex High operational safetyx Low engine RPMx Low fuel consumptionx Low emissions

2. The hydrostatic travel drivex Permanently high ratio of efficiencyx Optimal overload protectionx Excellent precision controlsx Stepless regulation of speedx Exact straight travelx High manoeuvrability including turning on

the spot

3. The innovative track frame conceptx Low ground pressurex High stabilityx Excellent climbing ability

x High shock absorption

4. The economical working attachmentsx Hydraulically driven generatorx Hydraulically driven compressorx Hydraulically driven loading cranex All aggregates are driven by the standard diesel

engine of the welding tractor.x Up to 6 modular welding positionsx Welding and power cable premounted to crane

5. The practical and comfortableworking environment

x Available with canopy as well as with fullyenclosed cab

x Optimal visibility of work areax Single joystick control of basic machinex Control for crane and compressor located next

to operators seatx Electrical isolation monitoring


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y.


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The SR 712 BM Welding Tractor: Versatile,

Functional design

The modern SR 712 BM welding tractor is especiallyremarkable due to its functionality as carrier machinefor the equipment necessary for pipeline welding.

The standard diesel engine of the welding tractor isused for driving the welding generator, the hydrauliccrane and the air compressor an additional dieselengine is not necessary for this purpose. Thus noiseemissions are reduced, fuel consumption made moreefficient and maintenance work on additional com-ponents is eliminated.

The long tracks and the high ground clearance alsomake it possible to use the machine in difficult groundconditions optimally. The added, extremely low groundpressure guarantees safe operation even on softground, as is especially the case on pipeline sites.

Easy and safe operation

One decisive aspect when operating a crawler welder

is easy control. Above all the hydrostatic travel driveis remarkable due to its single lever control. Thislever controls all travel movements of the machine.

Control of the generator, loading crane as well as thecompressor are located next to the operators seat.The operator can concentrate fully on the work areafrom the operators seat and can guarantee safehandling of the machine even at construction siteswith tight quarters.

Single joystick control as well asthe possibilities of a canopy and afully enclosed cab make theLiebherr operator post remarkable.

Control of the loadingcrane and the compres-sor is ergonomicallylocated next to theoperators seat.


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precise and economical.

A hydraulically driven aircompressor fills the largeair tank.

The electric generator isdriven hydraulically forconstant weld quality.

The welding tractor can be equipped with6 welding positions.


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Technical Data

EngineLiebherr-Diesel Engine____ D 924 T-ERating perISO 3046 ________________________ 163 HP (120 kW) at 2000 RPMDisplacement__________________ 6,7 l (409 cu.in)Bore/stroke ____________________ 122/142 mm (4.8/5.9 in)Design____________________________ 4 cylinder, in-line, water-cooled, turbo-

charged, engine individual cylinderheads, wet cylinder bushings, mainte-nance-free drive for fan and water pump

Injection ________________________ direct fuel injection with distributor injec-tion pump, mechanical regulator

Fuel filtration________________

pre-filter with water separator and microfilterAir filtration __________________ combustion air pre-filter with automatic

dust ejection, dry air filter system withmain and safety element

Lubrication ____________________ pressurized lubrication system with mainflow filters and integrated oil cooler,deep oil pan for inclinations, enginelubrication to an inclination of up to 45h

to each sideOperating voltage____________ 24 V

Alternator______________________ 55 A DCStarter____________________________ 5,4 kW (7.3 HP)Central fuse box______________ 35 ABatterie __________________________ 110 Ah

Travel DriveDesign____________________________ independent hydrostatic drive of travel

gearPump flow ______________________ max. 125 l/min (32 gpm)Max. pressure ________________ adjusted to 420 bar (6090 PSI)Travel speed __________________ 011 km/h (06.8 mph) infinitely varia-

ble, forward and reverseSteering__________________________ hydrostaticService brake__________________ hydrostaticParking/emergency

brake______________________________ automatic multi disc brake in final drivesCooling system ______________ hydraulic oil cooler with separate cooling

circuit with gear pump and front mountedcooler

Filter system __________________ cartridge fine filters in the cooling circuitFinal drive______________________ 2-stage planetary reduction gear with

hydraulic travel motor

Track FrameDesign __________________________ maintenance-free crawler travel gearMount ____________________________ fixed over pre-mounted support axles

and bridgeChains____________________________ sealed, chain tension via spring loaded

tensioner and hydraulic cylinders, singlegrouser pads

Chain links ____________________ 44Sprockets________________________ 2 replaceable segmentsTrack rollers __________________ 7Carrier rollers ________________ 2

Travel Control1 Joystick lever ______________with electronic control for all travel func-

tions: travel direction, speed, steering andcounter-rotation

Low speed range ____________ for the total joystick deflection range forthe travel speed from 05 km/h (0 3.1mph)

Electronic enginespeed sensing control______ electronic regulation assures a constant

balance between travel speed andneccessary drawbar pull through enginespeed sensing avoiding engine overload,

even in partial load rangeStraight line travel __________ electronically controlledParking/emergency

brake______________________________ automatically applied after the joysticklever is put in neutral position

Safety lever____________________ inactivates complete travel hydraulic cir-cuit and automatically activates the park-ing brake

Emergency shut off ________ push button on instrument panel imme-diately activates parking and emergency

brake

Implement Hydraulic

Hydraulic system ____________ on demand (load sensing) control, swashplate type variable displacement pumpand pressure cut-off for generator driveand separate circuits for compressor- andcrane drive

Max. pump flow ______________ max. 300 + 38 + 38 l/minPressure limitation__________ adjusted to 280 barFilter system __________________ return filter with magnetic rod in hydrau-

lic tank

Operators PlatformMount ____________________________ resiliently mountedOperators seat________________ fully adjustable swing seat, adjustable to

operator weightMonitor__________________________ comprehensive instrument panel on the

right hand side of the operators seat

Refill CapacitiesFuel tank ______________________________________________________________________________ 310 lCooling system ______________________________________________________________________ 52 lEngine oil ______________________________________________________________________________ 18 lSplitterbox ____________________________________________________________________________ 2,5 lHydraulic tank ______________________________________________________________________ 178 lFinal drive, each ____________________________________________________________________ 5,5 l

GeneratorDesign____________________________ hydraulic powered Stamford electric

generator in protection skid (IP 45)Rating____________________________ 125 kVA

Voltage __________________________ 231/400 V 50 HzSwitch box ____________________ integrated switch box with Amp., Hz., and

Volt gauges and service hour indicator;insulation monitoring device

Plug sockets __________________ 4 x shuko 231 V4 x CEE 400 V

Operation ______________________ push button on instrument panel


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Technical Data/Dimensions

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CraneDesign____________________________ fully hydraulic powered HIAB crane with

400h slewing angle; front mounted; com-plete with service lead supports and hookfor lifting of welding tent

Model ____________________________ 071 AWCapacity ________________________ 70,6 kNm (7.2 tm)Max. reach ____________________ 7,2 meter (full hydraulic)Operation ______________________ control levers and emergency switch at

operators platform

Welding Equipment

Design __________________________ 4 pos. electric powered welding sourcesmounted in protection housingsModel ____________________________ on customers requestOperation ______________________ remote control on welding spot, service

lead two meters longer than max. reachof crane

Working Attachmentx Lockable toolboxx Gasbottle support for two propane gasbottlesx Working lights at front, left and rear side of the machine

Optionalsx Cabinx Airconditioningx Trackguard

x Swamp undercarriagex Air compressor Quincy 390 LVDx 6 welding positionsx Preparation for automatic weldingx Salt chainsx Different Generatorx Different Compressorx Different Crane

A

C

D

B

F

E

Dimensions ft-in/mmA Height over canopy 102/3100B Height over engine cover 611/2100C Overall length 229/6934D Distance idler/sprocket center 87/2615E Height of grouser 2/56F Additional length frontside from idler cutter 58/1719

Overall width withpad size 24/610 mm 4944 sq.in/3.19 m2

28/711 mm 5766 sq.in/3.72 m2

30/762 mm 6184 sq.in/3.99 m2

34/864 mm 7006 sq.in/4.52 m2

CompressorDesign____________________________ hydraulic powered heavy duty Quincy air

compressor, skid mountedModel ____________________________ QR-25 basic two-stage compressor model

370 LVDRating____________________________ 1.245 l/min @ 14 bar

Airreceiver ____________________ 500 l; 16 barOperation ______________________ control lever at operators platform


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Joystick Position

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