7S power unit ????

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catsrbest

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I looked at a Cat power unit with a clutch on the back today. The serial is 7S5550, what Im curious is if this is like a D-4 or D-2. Its direct start and it has a few differences on it from the older motors with pony engines. Any info????

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Fri, Jun 7, 2019 7:58 AM

Old Magnet

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7S5550 is a 1948 D311 Power Unit.

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Fri, Jun 7, 2019 9:57 AM

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Our channel highlights machines from the earliest Holt and Best track-type tractors, equipment from the start of Caterpillar in 1925, up to units built in the mid-1960s.