Two H Series rough-terrain forklifts have been upgraded to Tier 4-Interim: Case 586H and 588H. The 78-horsepower engines boost fuel efficiency by a minimum 5 percent, the company says. Standard 15-foot mast gives the 586H a minimum operating weight of 13,228 pounds; lift capacity of 6,000 pounds; and lift speed of 107 feet per minute. Model 588H has minimum operating weight of 15,639 pounds; lift capacity of 8,000 pounds; and lift speed of 106 feet per minute. Both are available with 22-foot masts and have zero-tail swing design.