BRAKE CONTROL VALVES - TM-5-3805-258-24-1

TM-5-3805-258-24-1 Loader Scoop Type DED 4x4 Articulated Frame Steer 2 1/2 Cubic Yard Bucket (CCE) Airborne/Airmobile Manual
Page Navigation
251

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 W H E E L B R A K ES BRAKE CONTROL VALVES There are two brake control valves. Each valve is fastened directly under a pedal that is operated by the operator’s left and right feet. L O C A T I O N O F T H E B R A K E P E D A L S 1. Left pedal. 2. Right pedal. When left pedal (1) is pushed, air goes in two directions. It goes to the transmission neutralizer valve and causes the transmission to disengage. It also goes through orifice check valve (5), double check valve (6) and on the air cylinders to engage the wheel brakes. L O C A T I O N O F B R A K E C O N T R O L V A L V ES 3. Brake control valve for left pedal. 4. Brake control valve for right pedal. 5. Orifice check valve. 6. Double check valve. When right pedal (2) is pushed, air goes through double check valve (6) and directly to the air cyl- inders. S Y S T E M S O P E R A T I O N Operation BRAKE CONTROL VALVE (Brakea Releeaed) 7. Seet. 8. Rubber spring. 9. Piston. 10. Retainer. 11. Out- let passage. 12. Spring. 13. Valve. 14. Valve body. 15. Spring. 16. Exhaust paasage. 17. Inlet paasage. 18. Ex- haust diaphragm. When a brake pedal is pushed, a force is put on seat (7). This force pushes rubber spring (8) and piston (9) down. Piston (9) comes in contact with valve (13) and closes exhaust passage (16). Further movement of the pedal causes piston (9) to move valve ( 13) down, away from its seat in valve body (14). Pressure air is now free to go from inlet passage (17) to outlet passage (11). When the force of spring (15) becomes more than the force of spring (12), piston (9) lifts enough to let valve (13) come in contact with valve body (14) again. This stops the flow of air through outlet pas- sage (11). Piston (9) is still against valve (13), so exhaust passage (16) is closed. The control valve is now in balance and air pressure is held in the system. If the pedal is lifted a small amount, the force above piston (9) is less. The force of spring (12) will lift the piston off of valve (13). Pressure air in the system goes around piston (9) through exhaust pas- 3-80

Privacy Statement
Press Release
Contact