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Caterpillar 120G Motor Grader

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Caterpillar Motor Graders
Equipment Specifications - RitchieSpecs
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Caterpillar 120G
Caterpillar 120G
Caterpillar 120G blade
Caterpillar 120G controls
The Caterpillar 120G motor grader was introduced in 1974 in the USA and Canada. Production began in Australia a year later.

[edit] Features

The 120G has a 3304 turbocharged, four-cylinder engine producing 125 or 130 flywheel horsepower (FWHP).

The 120G was manufactured in the USA, with a 87V serial number prefix; in Canada, with a 82V prefix; and in Australia, with a 11W prefix.

The American unit has a direct drive and powershift transmission. It comes standard with an articulated frame, full hydraulic controls, oil disc brakes, and dual circuit air brake system. It has 125 FWHP.

The Canadian unit comes standard with articulated steering and tandem drive. It has 130 FWHP.

The Australian unit has a direct drive transmission. It comes standard with tandem drive, side shift, and a cab. It has 125 FWHP.

[edit] Modifications

In 1975 Caterpillar added a 19-amp alternator, beginning with 87V01735.

In 1976, a water separator and larger axles were added, and final drives were modified, beginning with 87V02262. Rimpull was increased, beginning with 87V02416. A rollover protection system was added, beginning with 82V00720.

In 1977 Cat added an electric service meter, beginning with 87V02976. Two-cylinder steering was made standard, beginning with 87V03203.

In 1978 a water separator was added to the Canadian unit, beginning with 82V00850.

Production in Canada ended in 1980.

In 1980 a scroll metering fuel system (SMFS) and ether starting aid were added, beginning with 87V05275.

In 1980 and 1983 Cat modified the drawbar by adding bronze alloy drawbar wear strips, beginning with 11W01033 and 87V05486.

In 1981 an electronic monitoring system was added and a low profile cab was made standard, beginning with 87V05734. A four gear planetary final drive was added, beginning with 11W01050 and 87V05791.

In 1983 Cat modified the drawbar again, and added bronze alloy circle wear strips, beginning with 11W01137 and 87V06666.

In 1984 the SMFS was modified, beginning with 87V06979.

In 1986 the moldboard curvature was changed, beginning with 87V08135.

In 1987 new load sensing hydraulics were installed and an electric system update was done, beginning with 11W01251 and 87V08360. At the same time the American unit received a 50-amp alternator.

In 1989 belted steps were added, beginning with 87V09063. Cat also modified the static seat with a height adjuster, beginning with 87V09068.

In 1990 the engine began running at 2000 revolutions per minute (RPM) to reduce platform vibration, beginning with 87V09327.

In 1993 the electric horn was replaced with an air horn, beginning with 87V09599. The air conditioning refrigerant was changed to R-134A, beginning with 97V09732.

Production of 120G ended in 1995; it was replaced by the Caterpillar 120H.

Based on data from the sales database of Ritchie Bros. Auctioneers, it is estimated that more than 12,200 Caterpillar 120G motor graders have been produced.

Highest Serial #
Australia
11W 01335
Canada
82V 00860
USA
87V 10095
Total = 12,290