135484A1 New Aux Hydraulic Oil Pump Cooler Fits Case-IH Combine Model 2366One New Aftermarket Replacement Auxiliary Hydraulic Oil Pump Cooler that Fits Case IH Combine Model: 2366 Dim A (1) 20 5 16" Dim B (2) 15" Oil Cooler Tabulators: The rattling noise that you hear in these new oil coolers is normal. This style oil cooler uses a think coiled wire inserted inside the tube during the manufacturing process to promotes a turbulent flow. This turbulent flow is actually used to increase the cooling capacity of the oil cooler.