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The D9, with 354 kW (474 hp) of gross power and an operating weight of 49 tons, is in the upper end, but not the heaviest, of Caterpillar's track-type tractors, which range in size from the D3 57 kW (77 hp), 8 tons, to the D11 698 kW (935 hp), 104 tons.
The D9 gained media attention in the new millennium due to its use by the Israeli Defense Forces in the destruction of enemy infrastructure as part of its controversial security operations.
The main D9 contributions to the project are earthmoving and soil-leveling, clearing a path for the security fence, and digging trenches in front of the security fence.