John Deere 570A to JD670 specifications

JD570-A and JD670: blade positioning is more than moldboard length

Deere's JD570-A brochure describes an articulated grader with a hydraulically positioned saddle and separate front-wheel lean. The saddle positions the blade for bank work; articulation changes the frame relationship; wheel lean is another adjustment. A demonstration of steering alone does not demonstrate that the saddle locks or blade-positioning functions work.

Check those functions through the applicable operating procedure rather than judging the blade system only by a straight-road pass.

The JD570-A document lists scarifiers, moldboard extensions and wheel weights as equipment choices, then separates operating weights with different combinations fitted. A weight for the standard machine should not be used unchanged for a scarifier-equipped purchase. The tire table also gives different widths and front-axle clearances with different tire sizes.

For hauling or narrow access, identify the installed tires and attachments first; the smallest width and the largest clearance do not necessarily belong to the same configuration.

The JD570-A specification separates its wet-disc service brakes from the mechanically operated parking brake. They act on the tandem wheels but use different controls. A successful service-brake stop therefore does not establish that the parking mechanism holds correctly; both require their applicable checks.

The JD670 sheet specifies a different steering and blade arrangement, including hydraulically articulated frame steering, a foot-operated lift-arm positioning mechanism and dual blade-lift levers with float. Its hydraulic-motor circle drive and blade sideshift describe separate adjustments. A circle that rotates successfully is not by itself a test of the sideshift, lift arms or their holding functions.

Record which movement is weak, loose or leaking when assessing the blade assembly.

Its gross and net power definitions also state different engine accessories: the gross figure excludes the fan, while net flywheel power includes the named installed accessories. Those ratings are not two transmission settings. Likewise, the listed travel speeds assume a stated engine speed and no tire slip.

A speed table cannot establish the ground speed a worn or slipping machine will achieve under a grading load. Use the JD670's own configuration notes rather than transferring either the JD570-A's geometry or a later 670D's controls onto it.

The JD670 drawing also separates blade shoulder reach outside the wheels from blade sideshift and circle sideshift. These are different geometric descriptions. A moldboard extension changes the cutting assembly; it does not automatically increase the published travel of the sideshift mechanism or the lift cylinders.