TM 5-3805-258-24-1A l R S Y S T E M A N D B R A K ESS Y S T E M S O P E R A T I O NHYDRAULIC CIRCUIT FOR THE WHEEL BRAKES1. Air/hydraulic cylinders(two).2. Brake fluid preaaure(overatroke)eivitchea(two).HYDRAULIC CIRCUIT3. Air Iinee (two) from6. Brakefluid preaauredouble checkvalve.indicator.4. Brakefluid reaervoira7. Wheel brakea (four).(two).5. Breathere (two).The hydraulic circuit is divided into two separatecircuits, one for the front wheel brakes and one forthe rear wheel brakes. Each circuit has a reservoir, anair/hydraulic cylinder and two wheel brakes.Air/hydraulic cylinders (1) have two cylinderseach, one for air (air cylinder) and one for brake fluid(master cylinder). The air cylinders are part of theair circuit for the wheel brakes. Air pressure in theair cylinders moves the piston in the master cylinder,which causes the compression of the brake fluid inthe hydraulic circuit and activates the brakes.Wheel brakes (7) are at all four wheels. They areused to stop the movement of the machine duringnormal operation.Brake fluid pressure (overstrike) switches (2) acti-vate brake fluid pressure indicator (6) when there istoo much travel (stroke) in the master cylinder.NOTE: All parts in the hydraulic circuit are for usewith DOT 3 brake fluid only.Reservoirs (4) provide extra brake fluid for themaster cylinders.3-85
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