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Caterpillar 12G Motor Grader

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Caterpillar Motor Graders
Equipment Specifications - RitchieSpecs
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Caterpillar 12G
Caterpillar 12G
Caterpillar 12G blade
Caterpillar 12G interior
The Caterpillar 12G motor grader was introduced in the USA in 1973 as the replacement for the Caterpillar 12F. Production began in Australia in 1985, and Brazil in 1993.

[edit] Features

The 12G has a 3306 six-cylinder engine producing 135 flywheel horsepower (FWHP). It has a direct drive or powershift transmission. It comes standard with full hydraulic controls, hydraulic sideshift and tilt, oil disc brakes, dual air, and an articulated frame.

The 12G was manufactured in the USA, with a 61M serial number prefix; in Australia, with a 3PL prefix; and in Brazil, with a 3WC prefix.

[edit] Modifications

In 1976 Caterpillar added a water separator, beginning with 61M03778. The rimpull was increased, beginning with 61M03953.

In 1977 an electric service meter was added, beginning with 61M04684.

In 1980 Cat added a scroll metering fuel system (SMFS) and an ether starting aid, beginning with 61M07711.

In 1981 an electronic monitoring system operator panel was added and a low profile cab was made standard, beginning with 61M08401.

In 1983 Caterpillar added a bronze alloy drawbar and circle wear strips, beginning with 61M10074.

In 1986 the moldboard curvature was changed, beginning with 61M11716.

In 1987 new load sensing hydraulics were installed and an electric system update was done, beginning with 3WC01067 and 61M12027. At the same time the 61M unit received a 50-amp alternator.

In 1989 belted steps were added, beginning with 61M13352. Cat also added a height adjuster to the static seat, beginning with 61M13367.

In 1993 the electric horn was replaced with an air horn, beginning with 61M14970. The air conditioning refrigerant was changed to R-134A, beginning with 3PL00925 and 61M15358.

Caterpillar offered a certified rebuild program with this model.

Production of 3WC and 61M ended in 1995; 3PL ended in 1996.

The Caterpillar 12G was replaced by the Caterpillar 12H.

Based on data from the sales database of Ritchie Bros. Auctioneers, it is estimated that more than 19,300 Caterpillar 12G motor graders have been produced.

Highest Serial #
Australia
3WC 01882
Brazil
3PL 01307
USA
61M 16201
Total = 19,390