Motor Grader Models — Browse All Makes & Manufacturers

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Motor grader blade width – also called moldboard width – determines how much material the machine moves in a single pass. Standard blade widths range from 12 to 14 feet on mid-size machines, with large production graders running blades from 14 to 24 feet. Road maintenance graders typically operate with 12 to 14-foot blades suited to working within road shoulders and ditches. Large mine site and haul road graders require wider blades to maintain production across the road widths that heavy haulage operations require. A blade that is too narrow for the application creates multiple-pass inefficiency; a blade that is too wide for the site reduces maneuverability and creates shoulder encroachment issues.

All modern motor graders use an articulated frame that allows the rear power unit to pivot relative to the front blade frame, dramatically improving the machine's ability to maintain blade angle while navigating curves and working on cross slopes. The articulation joint is one of the highest-wear structural points on a motor grader and should be inspected carefully on any used machine for play, wear in the pivot pins and bushings, and the condition of the hydraulic cylinders that control the articulation angle. Excessive articulation joint play affects grading accuracy directly – a grader that cannot hold its blade angle precisely across a pass delivers uneven surface results regardless of the operator's skill.

The circle – the large ring gear that rotates the moldboard – is one of the most mechanically unique and critical components on a motor grader. The circle drive motor, ring gear teeth, and circle shoes that support the circle on the drawbar are all wear items that accumulate fatigue across the machine's working life. Worn circle gear teeth create backlash in the blade angle control that makes precise grading difficult. Worn circle shoes allow the circle to move vertically under cutting load, reducing blade pressure consistency. A thorough inspection of the circle drive system, including listening for gear noise during rotation and checking for vertical movement under load, is essential on any used motor grader.

Motor graders are available with powershift and direct drive transmission options depending on manufacturer and model. Powershift transmissions with eight or more forward speeds allow the operator to maintain optimal blade speed across varying material conditions without stopping – a significant productivity advantage in production road building and maintenance work where constant speed changes would otherwise be necessary. Direct drive transmissions are simpler and less expensive to maintain but require the operator to stop and manually change gears when conditions change. Most commercial motor graders in the mid-to-large class use powershift transmissions; direct drive is more common on smaller machines used in less demanding applications.

GPS grade control systems – from suppliers including Trimble, Topcon, and Leica – automatically control blade height and cross-slope to match a digital design surface, dramatically reducing the number of passes required to achieve specification grade on a large site. A motor grader fitted with a current-generation GPS grade control system commands a meaningful premium over a comparable machine without it, reflecting the productivity and labor cost advantages the technology delivers on controlled grading projects. Buyers evaluating used graders with GPS systems fitted should verify software currency, calibration status, and subscription validity, as an out-of-date or uncalibrated system requires investment to restore to full function.