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Caterpillar D9G Crawler Tractor

From RitchieWiki

Caterpillar Crawler Tractors
Caterpillar D9G with an SU-Dozer
Caterpillar D9G
Caterpillar D9G with a P-Dozer and 9D Ripper
The Caterpillar D9G crawler tractor was introduced in 1961 as a replacement for the D9E.

[edit] Features

The D9G has a D353 turbocharged after-cooled six-cylinder engine producing 385 flywheel horsepower (FWHP). It comes standard with a 90-inch (229-cm) track gauge, oil-cooled brakes and steering clutches, and powershift transmission.

The D9G was manufactured in the U.S. only, with a 66A serial number prefix.

[edit] Modifications

In 1965, a single air cleaner and offset fuel tank was added, beginning with 66A03071 and 66A03266 respectively.

In 1969 a rollover protection system (ROPS) was installed, beginning with 66A08055.

In 1969, Caterpillar introduced the dual D9, also known as DD9, which consisted of two D9 tractors connected to create double the power. Tractors could be connected front and back or side-by-side. All of these tractors are equipped with air compressors.

The D9N the front tractor, where the operator rides, was given a 90J prefix; the rear tractor has a 91J prefix.

The D9N the left hand tractor, where the operator rides, was given a 29N prefix; the right hand tractor has a 30N prefix.

In 1969 and 1970, an automatic braking system actuated by low pressure and an electric starter were made standard, beginning with 66A09418, 91J00093, 29N00042, and 90J00093.

In 1973 and 1974, Caterpillar added a sealed and lubricated track, beginning with 66A12658, 90J00109, 91J00109, 29N00048, and 30N00048.

Production of the D9G ended in 1974.

The Caterpillar D9G was replaced by the Caterpillar D9H.

Based on data from the sales database of Ritchie Bros. Auctioneers, it is estimated that more than 14,700 Caterpillar D9G crawler tractors have been produced.

Highest Serial #
USA
29N N/A
30N N/A
66A 14583
90J 00116
91J 00077
Total = 14,776