ADAPTER AS 3535106 - Caterpillar

When final drives are disconnected, the machine has no brakes. To disconnect the final drive with the machine on a slope would allow a "runaway" condition. Before the final drives are disconnected, either put blocks in the path of the tracks or connect the towbar to the towing vehicle. After towing the machine to the desired location, either block both tracks (front and rear), keep it connected to the towing vehicle or engage the final drives. If the failure is in a final drive, engaging the final drive may not insure that the brake on the failed final drive will be effective. If one of the gears has lost some of its teeth, the sprocket may be rotated even though the brake is engaged and the disconnect mechanism is engaged.
Track Brake Valve
TRACK BRAKE VALVE
1. Spring. 2. Valve. 3. Inlet 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 for pilot system supply oil. 13. Outlet 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 brake 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 the 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 force of spring (1) to make a connection between oil passage (3) and oil passage (8). There is no oil flow in passage (3) until one of the speed and direction valves in the pilot system is activated.Activation of either of the speed and direction valves causes an increase in pressure in passage (3). Oil pressure from the pilot system in chamber (5) has moved spool (4). There is an increase of oil pressure in passage (8) and chamber (10). Oil pressure in chamber (10) moves spool (15) against the force of spring (11) to make a connection between oil passage (12) and (13). Supply oil from the pilot system, at approximately 335 psi (2300 kPa), goes into passage (12). An oil line connects passage (13) to the parking brakes. When passages (12) and (13) are connected, the oil pressure that causes release of the parking brakes, is the same as the pressure of the pilot system oil.Oil pressure of approximately 30 psi (205 kPa) is