Cummins Inc., a maker of engines, said it expects to cut as many as 1,500 jobs by the end of 2012 and lowered its forecasts for revenue and profit.

Cummins cut its forecast for full-year revenue to about $17 billion from $18 billion and its forecast for earnings before interest and taxes to about 13.5 percent from a range of 14.25 percent to 14.75 percent. The Ebit guidance doesn’t include the cost or benefits of the job cuts.

Cummins, based in Columbus, Indiana, produces engines for trucks and power-generation equipment. Its shares had gained 20 percent this year as of Tuesday’s close. The shares slid 4.2 percent to $87 after the end of regular trading.

The company had second-quarter earnings of $2.45 a share, excluding gains from divestitures. That exceeded the average of 18 estimates compiled by Bloomberg of $2.27.

“We continued to see weak economic data in a number of regions during the third quarter, increasing the level of uncertainty regarding the direction of the global economy,” Chief Executive Officer Tom Linebarger said in a statement. “As a result of the heightened uncertainty, end customers are delaying capital expenditures in a number of markets, lowering demand for our products.”

Class 8 truck orders fell 35 percent in North America last month to 15,205, according to FTR Associates.