Vehicles with Mercedes 722.9 transmissions commonly have TCC problems such as harsh apply and release or excess slip, often accompanied by TCC codes. These issues can be caused by bore wear at the lubrication pressure regulator valve, which allows vital fluid to escape the circuit. In addition, cooler and lube pressures can be negatively affected. Reconditioning the bore and installing Sonnax oversized lubrication pressure regulator valve kit 88740-09K restores critical clearances for renewed TCC, cooler and lube operation.
Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.
Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.