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Sep 24, 2019 · Make every hour of operation count and use shorter cuts. This will help save energy and time. 5. Work up and down slopes whenever possible. Operating a machine on a hillside can be a dangerous job, which is why we recommend crawler dozer operators work slowly on slopes and keep attachments low.. The Caterpillar D7 is a medium bulldozer manufactured by Caterpillar Inc.. The first D7 appeared in 1938. The D7 dozer was the primary earthmover for construction of survivability positions and antitank ditches. It had to be transported by trailer due to its poor mobility.. The old farmdozer Cat D7F 1974 starting up and tracking to the site. More videos coming as work starts. September 2. 2019No more exhaust leaks! But still som.