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The Caterpillar H45Ds replaces the H45/H45s hammers. It is in the 300 foot-pound class (power), up from the 200 foot-pounds of its predecessors, and provides 2,300 blows per minute. The H35Ds completes the full range of Caterpillar small hydraulic hammers. It is in the 150 foot-pound class and provides 2,900 blows per minute. Both hammers are matches for the 301.6C and 301.8C Caterpillar mini-hydraulic excavators. The H45Ds also matches with the 302.5C mini-hydraulic excavator. The new hammers contain nearly 50 percent fewer parts than the H45/H45s. The hammers have enclosed housing, recoil isolation, high and low pressure accumulator and a one-piece body.