Boral's Western Star tipper dogs use the Allison 4500 series automatic transmission.
Boral Transport benefits from reduced trip times and improved reliability with Allison fully automatic transmissions in their new fleet of heavy-duty Western Star trucks.
Sydney, Australia - One of Australia's largest building products companies, Boral Limited, is using Allison fully automatic transmission technology to lower trip times, improve truck uptime and operate more efficiently.
"Our Allison fully automatic equipped trucks are proving to be better in city traffic than automated manuals, with improved trip times coming as a result of quicker acceleration off the mark and an ability to keep up with traffic flow," comments Merv Rowlands, Boral Transport's fleet engineering manager.
"We can have two identically laden trucks leave a quarry 100km north of Sydney at the same time travelling together on the F3 Freeway. When they hit the edge of the metro area at Hornsby, the Allison equipped truck really shows its acceleration advantages, leaving its competitor behind," he added.
Boral operates hundreds of heavy trucks across Australia in a range of configurations including prime movers hauling tippers, powder tankers, bitumen tankers, tipper dog units, and concrete agitators. The company has historically specified Allison transmissions in its large fleet of concrete agitators; however, it had never used Allison equipped heavy-duty trucks with gross vehicle weights in excess of 42 tonnes.
In 2009, Boral purchased three Western Star 4800FX tipper dog vehicles equipped with Allison 4500 Series transmissions to trial the trucks in day-to-day city-based operations. The availability of the Allison 4500 series as a standard option with Western Stars was significant factor in their choice by Boral as a preferred supplier of heavy vehicles. Following the success of those trials, the company has added five more Allison equipped Western Star tipper dog vehicles in the first six months of this year, and ordered a further 14.
Rowlands notes that problems with the reliability of automated manual gearboxes in its truck fleet also gave the company reason to look at the latest generation of fully automatic Allison transmissions for heavy trucks.
"We were eager to try Allison transmissions in city-based vehicles because of our extensive experience with them in agitator trucks over many years and the great success we had with a recent retrofit into a tipper & dog vehicle," said Rowlands.
"We always wanted to run these trucks with two different shift patterns to allow us to maximise efficiency when the vehicles were running unladen. Initially we did this by interfacing with our onboard load sensing equipment which could identify whether the truck was loaded or not and switch the shift program accordingly," he added.
"Allison's engineering team then suggested we try the LBSS program, and it worked well, which has led us to use it across all of our Allison equipped trucks." Allison's LBSS (Load Based Shift Scheduling) adjusts the transmission shift schedule to best match the current vehicle load and operating conditions. This is achieved by monitoring vehicle throttle/engine torque demand and the vehicle acceleration rate. When light load conditions are identified, shifts are adjusted to ensure engine RPM is maintained at the most efficient point. When load is increased or grades are encountered, the shift schedule is adjusted to provide the operator with maximum performance."
A large segment of the Boral tipper dog fleet is based in the western suburbs of Sydney, but this part of the fleet operates all across the metropolitan area and travel to and from quarries up to 100km from the city, meaning that a flexible and versatile shift pattern is vital for efficiency.
"Reduced trip time, zero downtime, improved driver comfort and safety and outstanding performance both laden and unladen are all advantages with the Allison equipped trucks," concludes Mr. Rowlands.