1.26 HYDRAULICS Pressure switch (parking brake) (17) When the parking brake pressure (17) falls below 16 bar (232 psi) the pressure switch illuminates a warning light in the cab. The switch is located in the brake pipes on the right side of the front axle. If light is on, parking brake has been applied. If light comes on when parking brake is not applied, stop vehicle and investigate fault. Specification Operating pressure 16 bar (232 psi) rising Rear axle (18) The rear axle (18) contains double reduction bevel and planetary hub reduction gears and a limited slip differential. Braking is by inboard multi-disc units (when taken as an option).
The outboard wheel hubs are steerable, operated by a steering cylinder (19) attached to the axle. Steering cylinder (rear) (19) The rear steering cylinder (19) is a double acting hydraulic cylinder, supplied with pressure operating oil from the Steering Control Valve. The two cylinder rams have a ball joint end fitting, which connect to the swivel hubs for the front wheels. The rear steering cylinder is attached to the front of the rear axle, above the drive shaft housing. Specification Stroke (lock to lock) 200 mm Bore 85 mm Non-return valve (20) The non-return valve (NRV) allows pressure supply oil to be supplied from the main hydraulic control valve to the Brake Servo valve.
The NRV (20) prevents oil from the brake servo valve returning into the main control valve. This valve is fitted to Machines for certain markets only.