The Earthmoving Legacy Center in Elkader, Iowa showcases a beautifully restored Caterpillar 660 motor scraper. This single-engine predecessor to the iconic Caterpillar 666 twin-engine model, offers a glimpse into the powerful machinery of the past.
The Caterpillar 660, likely dating back 45 years, stands as a testament to Caterpillar’s enduring legacy of building durable and reliable equipment. Even today, many of these machines remain operational worldwide. This particular model appears to feature a 650 bowl coupled with the 660 tractor unit.
At the heart of the 660 lies a single Cat D346 V8 diesel engine, generating an impressive 450 horsepower. With a bowl capacity of 40 cubic yards struck and 54 cubic yards heaped, the Caterpillar 660 was engineered for efficient high-speed operation across long distances on relatively flat terrain. Often, these machines were assisted by tandem DD9G pushers.
Historical records indicate that approximately 109 units of the Caterpillar 660 were manufactured before an upgrade was introduced. In 1969, Caterpillar unveiled the 660B, boasting a more powerful Cat D346TA engine delivering 550 flywheel horsepower. This enhanced model also incorporated Caterpillar’s innovative 8-speed semi-automatic powershift transmission.
The meticulous restoration of this Caterpillar 660 is truly remarkable, showcasing the machine’s classic design and power. While its distinctive black smoke plume might raise environmental concerns today, it remains a captivating sight and sound for enthusiasts of classic heavy machinery. The roar of the engine and the sheer size of the machine evoke a sense of awe and admiration for the engineering prowess of a bygone era.
