Third regulator valve spring for Pettibone 30 12000

The 4012517A spring functions within the transmission regulator valve assembly of the Pettibone 30 12000. Its primary role is to provide the necessary force to control the position of the valve spool or piston, which manages hydraulic pressure and fluid flow within the transmission system. By regulating this pressure, the spring assists in the engagement of internal clutches and brakes, ensuring that the transmission operates with the correct hydraulic parameters for gear shifting and power transfer.

This component is designed specifically for the Pettibone 30 12000 transmission model. The spring has a diameter of 19/32 inches and a total length of 2-1/2 inches. It is engineered to meet the mechanical requirements of the regulator valve, providing consistent force to maintain the operating pressures required by the transmission hydraulic circuit.

In heavy machinery transmissions, regulator valve springs are used to maintain a set pressure threshold. When the hydraulic fluid pressure changes, the spring compresses or expands to adjust the valve position, thereby modulating the flow to keep the system pressure within the specified operating range. Proper spring tension is necessary to prevent clutch slippage or erratic shifting behavior.