The T 810 and T 814 were the first tractors from the company with both 1 000 r/min and 540 r/min power take-offs. Terra Trol Mark II, with major improvements, was introduced into production in February 1975. At the same time the cab was upgraded in various ways, including more headroom and greater glass area. 3 550 units of the T 810 and 1647 units of the T 814 were produced.
The new D 60 engine was introduced in the mid-1970s.