DRIVING & CHASSIS - BRAKE (PARKING BRAKE) HS120V 2. BRAKE (PARKING BRAKE) 2.1 OVERVIEW & OPERATING PRINCIPLE 2.2 STRUCTURE & COMPONENTS G5:9HM:=FGH 8F=J=B;7 756=B 9B;=B9 9@97HF=7GMGH9A =B89L Z 2 3 4 1 LF1W320A LF1W321A Basically, when pressure is not built up in the hydraulic system, the parking brake of the HST (driving) motor is operated. The brake packs are installed in the driving motors while the driving motors are located on the left and right sides of the vehicle. As shown in the figure, the hydraulic pressure is no longer applied on the brake area, and the disc spring (1) pushes the piston (2) that then compresses the discs.
Then, as the drive shaft (3) is connected to the discs (4) with the splines, and the discs are fixed to the housing, this driving power is lost, thereby resulting in braking. On the other hand, when the hydraulic pressure is supplied to the brake port Z, the brake piston is pushed, resulting in pushing the disc spring in the opposite direction. As a result, the parking brake is released and the driving power is restored and becomes ready to be used. 3 -12 GMW-0035