Caterpillar 140H NA

The Caterpillar 140H NA is a mid-size, articulated-frame motor grader in the roughly 14 to 15 tonne class, built for road maintenance, site grading, and general earthmoving. Factory documentation for the NA-spec machine, covering serial prefixes 2ZK built in the United States, 9TN in Brazil, and 9ZN in Australia, ties it to the Cat 3306 DIT/DITA: a mechanical six-cylinder turbocharged diesel with Engine Power Management, rated around 138 kW (185 hp) net in the upper gears and 123 kW (165 hp) in the lower gears. Standard operating weight on factory tires with full fluids and an operator runs close to 14.7 t (32,460 lb); factory-fit rippers, scarifiers, and push blades add to that base figure, and no single maximum-configuration weight is published for this engine arrangement. Documented NA-prefix serial ranges span roughly the mid-1990s through the early 2000s. The 140H line replaced the long-running 140G and was itself eventually succeeded by the 140M. Beyond the NA spec covered here, Cat also built the 140H under a separate ES electrical package and, later, a Global-spec build on the electronically governed 3176C engine. Attachment configurations across the line include a rear ripper-scarifier, front blade or push block, mid-mount scarifier, snow wings, a moldboard extension, and open or enclosed ROPS/FOPS cabs.

Within the NA lineup the electrical package stayed built around the mechanical 3306: no engine ECM, straightforward gauge-and-lamp monitoring, and only the powershift transmission running its own electronic controls. Cat's wider 140H family moved on from there, shifting later production under separate, non-NA prefixes to the electronically governed 3176C engine with its own ECM and diagnostics, a different machine to service despite sharing the 140H name and much of the same chassis, circle, and tandem hardware. That split is a large part of why the NA-spec 140H still holds a following in the used and parts market today: no emissions aftertreatment, no proprietary engine electronics to fail, and a fuel system a competent diesel shop can rebuild on the bench. Decades of 3306 use across Cat's truck, generator, and marine lines keep parts and know-how widely available, and the well-documented wear points on this platform (circle and drawbar wear strips, articulation-hitch wiring, wheel-lean cylinders, the parking-brake O-ring) are straightforward for independent shops to chase down. That combination keeps NA-spec 140H units earning their keep on road-maintenance and aggregate-site duty long after cheaper contemporaries have been parted out.

Below: full specifications, fluids & capacities, the factory service schedule, common service parts, verified fault codes, what owners discuss, attachment guidance, the complete assembly directory, and a serial-number reference. Complete parts lists with full OEM part numbers, exploded diagrams, quantities, and fitment data are available free in Heavy Parts AI.