John 2440 | 2640 Tractor Operators Manual
Full throttle speed at full load should be 2500 rpm (C). At light or no load, full throttle speed may increase to 2650 rpm (D). Normal working range is 1500 to 2500 rpm. Any speed in this range is acceptable. On tractors with Hi-Lo transmission, run engine at 2400 rpm (8) for standard PTO SPEED.