3-4 Relay Valve and 4-3 Sequence Valve

4th signal fluid pressure moves both valves into the upshift (fourth gear) position against the spring force acting on the 4-3 sequence valve. This causes the following changes:

• Orificed (#7) 2nd fluid is routed through the 3-4 relay valve and into the servo feed fluid circuit.
• Servo feed fluid is routed through the 4-3 sequence valve and into the 4th fluid circuit.
• 3-4 accumulator fluid routed from the 2-3 shuttle valve is blocked by both valves.