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When backsloping, the extension must be installed on the toe to obtain the heel clearance required. Caution, using it on the leading end in tough or rocky material may damage the extension.

When two extensions are installed, they should be used only in light maintenance work and will need to be removed for some jobs, as their length restricts blade positioning.

In rocky areas where control of the moldboard is desirable but there is a need to reduce vertical stress into the drawbar, circle and main frame, use a blade cushion arrangement for reduced maintenance and longer circle and drawbar component life.

An important feature in snow plowing or other high impact areas is the circle slip clutch. It will relieve horizontal impacts on the moldboard and circle and can reduce maintenance costs.

Maintaining Road and Existing Ditches and Shoulders

For maximum machine stability when maintaining the travel surface, the motor grader’s main frame should be straight with the drawbar and circle centered under the frame. For the widest possible pass width on the travel surface, keep the moldboard angle as square to the frame as possible. If material starts to flow around the leading end of the moldboard, or the rolling action dies, increase the blade angle. Keep machine travel speed as high as possible for maximum productivity but low enough to prevent machine bounce (4-7 mph [6-11 km/h]). On straight sections, steer the machine as straight as possible to maintain a straight shoulder and uniform crown to the road.

Articulating the rear frame toward the toe of the moldboard 2 to 5 degrees frequently reduces the machine’s tendency to bounce. This crab mode is extremely effective when cutting washboards from

M S E R I E S M O T O R G R A D E R S A P P L I C A T I O N G U I D E

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Figure 7. Aerial view of articulating rear frame toward toe of moldboard

Maintaining Roads Using Articulation

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