R1700G L.H.D. BRAKING SYSTEM Caterpillar

Opening pressure ... 345 ± 35 kPa (50 ± 5 psi)

The sequence valve is a pilot operated, normally closed spool valve. When the pressure in port (1) reaches the specified pressure, the valve will open and allow oil to flow from port (2) to port (3). Screw adjuster (4) clockwise to increase the pressure setting.

Reference: To check and adjust the towing brake release sequence valve, remove the valve and manifold assembly and connect to a test bench. Refer to Braking System, Systems Operation Testing and Adjusting, for the machine that is being serviced.