CLAMP, V-BAND 3018688C1 - Caterpillar

Track Brake Valve
TRACK BRAKE VALVE
1. Spring. 2. Valve. 3. Inlet passage for oil flow from pilot system valve. 4. Spool. 5. Oil chamber. 6. Oil passage. 7. Plunger. 8. Oil passage. 9. Oil passage. 10. Oil chamber. 11. Spring. 12. Inlet passage for pilot system supply oil. 13. Outlet passage for oil to release brakes. 14. Outlet to tank. 15. Spool.Oil pressure from the pilot system is needed for release of the parking brake before the machine can be moved. The functions of the track valve are: 1. To stop flow of pilot system oil to the parking brakes so that the brakes will be ON and keep the machine stationary when the implements are used. 2. To send oil to the brakes for brake release at the start of machine movement.3. To keep the machine stationary when there is a partial brake application caused by a decrease of pressure in pilot system oil.Before the engine is started, springs (1) and (11) push spools (4) and (15) to the right. When the engine is started, the increase of pressure in the pilot system oil in oil passage (12) is sent through passage (6) to chamber (5). Oil pressure in chamber (5) moves spool (4) against the