BEIJING, August 1 (Reuters) - Growth in China's manufacturing quickened in July, a private survey showed on Tuesday, as output and new orders rose at the fastest pace since February on strong export sales.

But even as firms boosted purchasing in anticipation of more business, employment levels at factories fell at the fastest pace in 10 months and a reading on business outlook was the lowest since last August - a sign that economic momentum may start to ebb in the months ahead.

The Caixin/Markit Manufacturing Purchasing Managers' Index (PMI) rose to 51.1 in July, above the 50-point mark that separates growth from contraction, and well ahead of the 50.4 in June which was also the median figure forecast by 21 analysts in a Reuters survey.

A resurgent export sector underpinned by a brightening global economy helped China post surprisingly strong gross domestic product growth of 6.9 percent in the first half of the year.

The Caixin readings diverged from an official PMI survey released on Monday which showed growth in China's manufacturing sector cooled slightly last month due to slackening export demand. The private survey, however, tends to focus on smaller firms while the official PMI covers mostly larger firms, many of them state-owned manufacturers.

"Operating conditions in the manufacturing sector improved further in July, suggesting the economy's growth momentum will be sustained." Zhengsheng Zhong, Director of Macroeconomic Analysis at CEBM Group, said in a note accompanying the data release.

"That said, it's unlikely that financial regulatory tightening will be relaxed."

The broader consensus among China watchers is that economic growth will cool in coming months as a government crackdown on financial risks raises borrowing costs, squeezing profits and output. Yet, there appears more than enough momentum to reach Beijing's growth target of around 6.5 percent for the year.

The Caixin new export orders reading came in at 53.5 in July, up from 50.9 June and the highest since February.

While China's foreign trade faces a mostly positive environment in the second half of the year, uncertainties still exist, Vice Commerce Minister Qian Keming said in Beijing on Monday.

The United States and China failed earlier this month to agree on major new steps to reduce the U.S. trade deficit with China, casting doubt over President Donald Trump's economic and security relations with Beijing.

Chinese goods producers in July were able to raise output prices the most since March, Tuesday's PMI showed, as input inflation also accelerated, though the price gains were much milder than those seen around the turn of the year.