* Apple hits all-time high on strong iPhone sales
* 178,000 private jobs added in June vs. est. 185,000 -ADP
* AutoNation profit falls on lower vehicle sales
* Indexes end: Dow +0.24 pct, S&P +0.05 pct, Nasdaq flat (Adds investor comment and detail, updates prices to close)
Aug 2 (Reuters) - The Dow climbed above the 22,000 mark for the first time on Wednesday, buoyed by Apple's healthy quarterly iPhone sales, while weakness in other tech stocks held back the Nasdaq and S&P 500.
Apple jumped 4.73 percent to a record high after the world's largest publicly listed company reported strong results. It is up 36 percent this year.
The iPhone maker's rise helped push the Dow to a record closing high, although tech heavyweights Microsoft, Facebook and Alphabet all lost ground following recent strong gains that have made the sector the strongest performer in 2017.
Some investors believe corporations must start spending less on buying back shares and more on technology to improve productivity in order to justify further gains in Silicon Valley stocks, with the S&P 500 information technology index already up 23 percent this year.
"Apple, at the heart of it, has a lot of consumer exposure, and the consumer is in great shape. But we would like to see some capex," said Mike Baele, managing director at U.S. Bank Private Client Wealth Management in Portland, Oregon. Microsoft slipped 0.44 percent and Facebook lost 0.33 percent, both among the heaviest drags on the S&P 500 and the Nasdaq.
The Dow has risen 11 percent in 2017 and is on track for its sixth straight record close, even as Wall Street loses confidence that President Donald Trump and a Republican-controlled Congress will be able to cut taxes and increase infrastructure spending this year.
"The Trump agenda getting done or not is not the difference between positive or negative GDP," said Brent Schutte, chief investment strategist at Northwestern Mutual Wealth Management Company in Milwaukee, Wisconsin. "I continue to believe the Trump potential tax changes are the icing on the cake of an already improving economy."
The Dow hit the 20,000 level in late January and crossed the 21,000 mark on March 1.
Two-thirds of S&P 500 companies have reported their second-quarter earnings so far and 72 percent of them have beaten Wall Street's expectations, according to Thomson Reuters I/B/E/S. In a typical quarter, 64 percent of companies beat expectations.
The Dow Jones Industrial Average rose 0.24 percent to end at 22,016.24, a record high. The S&P 500 gained 0.05 percent to 2,477.57 and the Nasdaq Composite was flat at 6,362.65.
Data showed U.S. private employers added 178,000 jobs in July after adding 191,000 in June. Economists polled by Reuters expected an addition of 185,000 jobs. The more comprehensive non-farm payrolls report is due on Friday.
AutoNation fell 7.17 percent after the largest U.S. auto retail chain reported lower quarterly profits.
Cardinal Health fell 8.20 percent after the drug distributor's 2018 profit forecast missed analysts' estimate.
About 6.5 billion shares changed hands in U.S. exchanges, above the 6.1-billion average over the last 20 sessions. (Additional reporting by Tanya Agrawal; Editing by Arun Koyyur and James Dalgleish)