Abstract: The braking system includes a housing, and a friction brake disposed in the housing and operationally connected to a member-to-be-braked. A biasing piston, for engaging the friction brake, is disposed in the housing, and a control piston is also disposed in the housing. The control piston and the housing define a pressure chamber for receiving a pressure medium which biases the control piston away from the friction brake. A first resilient member is disposed between the control piston and the housing to bias the control piston towards the friction brake. A second resilient member is disposed between the control piston and the biasing piston for transferring force applied to the control piston by the first resilient member to the biasing piston so as to bias the biasing piston towards the friction brake. The fiction brake includes brake lamellae operationally and longitudinally displaceably connected to the housing.

Abstract: The telescoping system includes a first fluid motor and a second fluid motor. The first fluid motor includes a first extension chamber and a first retraction chamber, and the second fluid motor includes a second extension chamber and a second retraction chamber. A hydraulic control system in the telescoping system controls the supply of hydraulic fluid to the first fluid motor and between the first fluid motor and the second fluid motor such that the first and second fluid motors operate independently.

Abstract: The aerial work platform includes a support frame, wheels rotatably attached to the support frame, and an electric motor rotatably driving at least one of the wheels. A boom having a first end is pivotably mounted to the support frame, and a fluid motor raises and lowers the boom with respect to the support frame. A work platform is supported by a second end of the boom. A battery pack supplies power to the electric motor. A first support structure, for supporting an auxiliary power plant that supplements power supplied by said battery pack, removably attaches to the support frame.

Abstract: The boom length measurement includes a transmitting unit mounted on the fly section of a multi-section telescopic boom, and a receiving unit mounted on the base section of the multi-section telescopic boom. The transmitting unit transmits a first and second signal having first and second transmission speeds, respectively. The second transmission speed is less than the first transmission speed. Based on a difference in transit times of the first and second signals received by the receiving unit, a length determiner determines the length of the multi-section telescopic boom. A display displays the determined length.