EMERGENCY AND PARKING BRAKE

QUICK RELEASE VALVE FOR EMERGENCY AND PARKING BRAKE

E M E R G E N C Y A N D P A R K I N G B R A KE

TM-5-3805-258-24-1 Loader Scoop Type DED 4x4 Articulated Frame Steer 2 1/2 Cubic Yard Bucket (CCE) Airborne/Airmobile Manual
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TM 5-3805-258-24-1 A I R S Y S T E M A N D B R A K E S A I R C I R C U I T F O R T H E E M E R G E N C Y A N D P A R K I N G B R A K E B R A K E C H A M B E R I N R E L E A S E D P O S I T I ON 1. Spring. 2. Air chamber. 3. Brake chamber rod. 4. Pis- ton. 5. Air inlet. L O C A T I O N O F B R A K E C H A M B ER 5. Air inlet. 6. Brake chamber. 7. Rod end. 8. Lever. The brake stays activated until the air system is at the correct pressure for operation and the parking and emergency brake control valve is moved to the OFF position (knob is pushed in). At this time, air pressure goes to air chamber (2) and pushes piston (4) to the left. Rod (3) and rod end (7) move lever (8) which releases the emergency and parking brake. When air pressure decreases to approximately 275 kPa (40 psi), the parking and emergency brake con- trol valve closes automatically (moves to the ON position) and stops the flow of air to air chamber (2). Spring (1) is no longer in compression and pushes rod (3) out and the brake is activated (emergency brakes). This same operation takes place when the parking and emergency brake control valve is manually moved to the ON position (pulled out). This activates the brake for parking. S Y S T E M S O P E R A T I O N EMERGENCY AND PARKING BRAKE The emergency and parking brake is fastened to the loader frame. Brake drum (4) is fastened to a yoke on the front drive shaft. The brake is a shoe-type brake that is engaged and released by brake chamber (1) for the emergency and parking brake. Plate (6) is fastened to the bearing housing for the front drive shaft. The plate is stationary and holds shoes (8) and the rest of the brake components in position. When the emergency and parking brake control knob is in the OFF position, air pressure in the brake chamber causes rod end (2) and lever (3) to move in the direction shown. Lever (3), connected to cam- shaft (5), causes the camshaft to turn in a counter- clockwise direction. Camshaft (5) is now not in con- tact with shoes (8) and the shoes are not in contact with brake drum (4). The brake is released. When the control knob is moved to the ON posi- tion, air pressure in the brake chamber is released. The springs in the brake chamber push rod end (2) out and lever (3) turns camshaft (5) in a clockwise direction. The camshaft comes in contact with shoes (8) and pushes them against brake drum (4). The brake is now engaged. L O C A T I O N O F E M E R G E N C Y A N D P A R K I N G B R A K E 1. Brake chamber. 2. Rod end. 3. Lever. 4. Brake drum. 3-77

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