Operation

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 W H E E L B R A K ES S Y S T E M S O P E R A T I O N Operation When button (1) is pushed, stem (5) pushes valve (7) against the force of spring (9). This lets air pressure from inlet passage (10) go to outlet passage (6) and to air horns (3). C O M P O N E N T S O F T H E H O R N V A L VE 1. Button. 4. Valve body. 5. Stem. 6. Outlet. 7. Valve. 8. Spring seat. 9. Spring. 10. Inlet. When button (1) is released, spring (9) moves valve (7) back to its seat in valve body (4). This stops the flow of air to outlet passage (6). The horns are OFF. Spring seat (8) holds spring (9) in the correct position. ORIFICE CHECK VALVE The orifice check valve is fastened directly to an elbow that is connected to the double check valve on the brake control valve for the right pedal. When the brake control valve for the left pedal is activated, air pressure moves valve (2) to the right against the force of spring (3). Air is permitted to flow freely through notches on the outside diameter of valve (2). Some air will also go through the orifice. This flow of air is to the air cylinders. When the left pedal is released, the orifice causes a restriction to the flow of air from the air cylinders to the brake control valve. This permits the transmis- sion to engage before the brakes are released. C O M P O N E N T S O F T H E O R I F I C E C H E C K V A L V E 1. Seat. 2. Valve. 3. Spring. DOUBLE CHECK VALVE The double check valve is fastened directly to the brake control valve for the right pedal. Inlet passage (4) is connected to the brake control valve. An elbow, from the orifice check valve, is installed in inlet pas- sage (3). Shuttle (2) keeps air pressure from movement to the right brake control valve, when the left brake control valve is activated. When the right control valve is activated, shuttle (2) keeps air pressure from movement to the left control valve, which would permit the transmission to disengage. D O U B L E C H E C K V A L VE 1 . P l u g . 2 . S h u t t l e . 3 . I n l e t p a s s a g e f r o m l e f t c o n t r o l valve. 4. Inlet passage from right control valve. 5. Outlet to air cylinders. Shuttle (2) moves when inlet pressures are differ- ent. The shuttle opens the inlet passage with the 3-82

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