First, install the lower bolt that attaches the bottom of the jack to the vertical frame piece. Then bolt the top of the jack to the lifting arm. You'll have to lift the arm to get the holes lined up -- another good time for a helper.
How To Assemble an Engine Hoist
By Matthew Wright, About.com
Nows it's time to add some muscle to this beast. The lifting is handled by a hydraulic ram (basically a long bottle jack). It's bolted to the assembly in two places.
Index: How To Assemble an Engine Hoist
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