Caterpillar rises after Q2 profit jumps

** Shares of Caterpillar CAT.N gain 6% to $$873 premarket

** The construction equipment company reports a higher second-quarter profit, driven by sustained demand for its power-generation and construction equipment

** Posts Q2 adjusted per-share profit of $8.17, up from $4.72 a year earlier

** CAT's overall quarterly revenue grew 24% to $20.54 billion and its core construction segment revenue grew 35%

** As of last close, stock up ~45% YTD