Cooler Bypass Valve

Fig. 2:

Fig. 3:

Some 31TH transaxles are equipped with a cooler bypass valve (Fig. 2). The valve is designed to bypass the transaxle oil cooler circuit in cold weather conditions, or when circuit restriction exceeds 25 - 30 psi The valve consists of an integrated check ball and spring, and a return tube to carry bypassed oil back to the pump. The bypass valve is mounted to the valve body transfer plate and is sealed with a rubber O-ring seal (Fig. 3).