Abstract: A harvesting header for use with a crop harvesting machine has a feederhouse interface and a header frame providing structural support for the harvesting header. A pivotable connection between the feederhouse interface and the header frame enable the header frame to pivot with respect to the feederhouse interface. At least one hydraulic ram connects between the feederhouse interface and the header frame to pivot the harvesting header on the feederhouse interface. A hydraulic supply provides pressurized hydraulic fluid to the hydraulic ram. An accumulator assembly fluidically connects between the hydraulic supply and the at least one hydraulic ram. The accumulator assembly has a precharge fluid/gas interface between a gas chamber and the hydraulic supply, and a working fluid/gas interface between the gas chamber and the at least one hydraulic ram.

Abstract: A harvesting header for use with a crop harvesting machine has a feederhouse interface and a header frame providing structural support for the harvesting header. A pivotable connection between the feederhouse interface and the header frame enable the header frame to pivot with respect to the feederhouse interface. At least one hydraulic ram connects between the feederhouse interface and the header frame to pivot the harvesting header on the feederhouse interface. A hydraulic supply provides pressurized hydraulic fluid to the hydraulic ram. An accumulator assembly fluidically connects between the hydraulic supply and the at least one hydraulic ram. The accumulator assembly has a precharge fluid/gas interface between a gas chamber and the hydraulic supply, and a working fluid/gas interface between the gas chamber and the at least one hydraulic ram.

Abstract: An agricultural machine, such as a combine harvester, includes a chassis supported by a pair of front wheels and a pair of steerable rear wheels, a first drive mechanism for driving at least one of the front wheels to move the chassis at a designated forward speed, and a second drive mechanism configured to operate independently of the first drive mechanism and to drive at least one of the rear wheels. A controller is configured to actuate the second drive mechanism in response to a user command to drive the at least one rear wheel to apply forward pressure on the chassis regardless of the forward speed. The controller may actuate the second drive mechanism to apply a maximum forward torque to the at least one rear wheel to thereby apply the forward pressure to the chassis.

Abstract: An agricultural machine, such as a combine harvester, includes a chassis supported by a pair of front wheels and a pair of steerable rear wheels, a first drive mechanism for driving at least one of the front wheels to move the chassis at a designated forward speed, and a second drive mechanism configured to operate independently of the first drive mechanism and to drive at least one of the rear wheels. A controller is configured to actuate the second drive mechanism in response to a user command to drive the at least one rear wheel to apply forward pressure on the chassis regardless of the forward speed. The controller may actuate the second drive mechanism to apply a maximum forward torque to the at least one rear wheel to thereby apply the forward pressure to the chassis.