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L-1150: New loader from LeTourneau

LeTourneau has added to its wheel loader range and introduced its latest hybrid electric drive - a combination of site proven performance, engineering strength and breakthrough technology.


The new LeTourneau L-1150 wheel loader has a bucket capacity of 19.1 – 24.5m3 and an operating payload of 34.47 tonnes. Breakout force is 100.2 tonnes and total operating weight is 131.5 tonnes.
The new loader offers two power options: a Cummins QSK38 V12 4-cycle turbocharged diesel developing 940 kW @ 1800rpm or an MTU-Detroit single-stage turbo diesel putting out 898 kW @ 1800rom.

Propulsion for the new loader is through new Switch Reluctance (SR) drives, the company’s latest variant of its class-leading hybrid electric drive. Featuring solid-state control, the SR drives deliver high electrical efficiency and extended operational life.

Described by the manufacturer as a significant jump in hybrid drive technology, the SR drive has been designed to recover and conserve up to 90 per cent of the energy lost during braking.

Utilising a DC bus system coming off a dedicated SR generator, the initial braking energy goes to a series of capacitors, similar to other hybrid electric vehicles. This accounts for around 40 per cent of recovered energy. The balance of the energy recovery is through the drive train (engine rotation, generator rotor, driveline, pump drive gear box and the like) initially overcoming the hydraulic loading requirements and then contributing to a tremendous flywheel effect due, in part, to the constant engine speed.

Along with improved operational efficiency, the new SR drive technology is claimed to deliver exceptional savings in fuel cost over the life of the machine.

Overall control of the loader is through the LeTourneau Integrated Network Control System (LINCS II). A second generation microprocessor-based digital control system it monitors and manages the machine’s hydraulics, electrics, engine performance and traction drive.

The loader also features the LINCS II load weigh data logging and storage system which displays load per pass, load per truck, and total load. With an adjustable overload alarm, the system interfaces with radio despatch systems for real-time and historic monitoring.

Steering and hoist and bucket control are through ergonomically-designed joysticks which fall comfortably to hand. Constant engine RPM assures full hydraulic steering response irrespective of vehicle speed. The proportional electro-hydraulic controlled hoist and bucket system – which operates independently of the steering system - utilises single-stage, double-acting cylinders for both hoist and bucket tilt.

Average cycle time is 20 seconds.
The L-1150 is equipped with two-stage braking. Primary machine braking is by an electric (retarding) system controlled from either the accelerator or retard/brake pedal. This is a non-wearing system and will stop the loader without the application of mechanical brakes. The secondary machine braking system (which incorporates the parking brake) is by air-modulated motor speed disc brakes.

The L-1150 sits on the unique LeTourneau high-strength low-alloy articulated steel frame, supported by four 50/65-51 46 PR (L-5) radial tyres fitted to 40-51 steel rims. Maximum articulation is 42o. The independent power module mounting system, consisting of the engine coupled to the SR generator, is cradled within the rear frame by the three-point cradled isolation system.

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