Student Driver Placement

August 2014

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26 www.studentdriverplacement.com August '14 It Works How Doing More With Less T KHGHIDXOWFRQÀJXUDWLRQIRU275 WUXFNWUDFWRUVLQ1RUWK$PHULFD KDVORQJEHHQDWKUHHD[OHXQLW ZLWKRQHVWHHUD[OHDQGWDQGHPGULYH D[OHV7KLVFRQÀJXUDWLRQLVFRPPRQO\ NQRZQDVD[GHQRWLQJVL[ZKHHO HQGVZLWKIRXURIWKHVL[SRZHUHG The key reason for having two axles at the back of the tractor is to meet the legal weight restrictions imposed on each of a WUXFN·VD[OHV%HIRUHJHDULQJEUDNLQJDQG WLUHWHFKQRORJ\UHDFKHGLWVFXUUHQWVWDWH LWZDVDOVREHQHÀFLDOWRVSUHDGDWUXFN·V power across a greater number of wheel HQGVVRYLUWXDOO\DOOWDQGHPD[OHFRQÀJX rations offered for tractors featured driving SRZHURQERWKD[OHV Now that engine horsepower and torque ratings have reached a plateau that is likely to extend well into the foreseeable IXWXUHWKHWHFKQRORJ\EHKLQGWLUHVDQG axle gearing caught up to the point where getting power to the ground can usually be accomplished WKURXJK D VLQJOH GULYH D[OH in all but the most extreme ZHLJKWJUDGHDQGKRUVHSRZHU VFHQDULRV $OWKRXJK WKH QHZHU GULYH WUDLQ WHFKQRORJ\ HQDEOHV UH moving the drive function from RQHRIWKHUHDUD[OHVZHLJKW carrying capacity still requires two axles at the back of the WUDFWRUHYHQLIRQHLVQ·WSRZ HUHG7KLVFRQÀJXUDWLRQLVUHIHUUHGWRDV D[VL[WRWDOZKHHOHQGVRQWKHWUDFWRU ZLWKRQO\WZRSRZHUHG 7KHUHDUHWZRPDMRUEHQHÀWVWRXVLQJD [FRQÀJXUDWLRQ 7KHODUJHUEHQHÀWLVZHLJKWUHGXFWLRQ DERXWSRXQGVLQPRVWFDVHVGXHWR the lack of a differential and axle shafts in WKHUHDUPRVWD[OH 7KHOHVVHUWKRXJKVWLOOLPSRUWDQWEHQHÀW LVDVLJQLÀFDQWUHGXFWLRQLQIULFWLRQORDGV RQWKHGULYHWUDLQ(YHU\URWDWLQJSDUWRI WKH GULYHWUDLQ DGGV VRPH SDUDVLWLF IULF WLRQORDGVRHOLPLQDWLQJDZKROHEXQFK of drivetrain components can measurably LPSURYHIXHOHFRQRP\ X By Tom Kelley 1RUWK$PHULFDQ7UXFNHUV:DUPLQJ8S7R [$[OH&RQÀJXUDWLRQ

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