7C3039 7C-3039 Oil Cooler For Engine C15 C18 3406B Excavator E245 E375

Folded fins or blocked oil passages increase air resistance, significantly reduce heat dissipation efficiency, and cause a continuous rise in oil temperature, triggering an alarm. Immediately shut down the system and reduce pressure. Use specialized tools to straighten the folded fins and use a low-pressure water gun to flush away the blockage. Be careful not to use excessive water pressure to avoid damaging the core. If the blockage is severe and cannot be cleared, replace the core. Do not force the system to continue operating, as this may cause overheating and damage.

Aging of the sealing ring, welding defects, or vibration can cause leakage at the joint surface, resulting in oil stains or coolant leaks. In an emergency, shut down the machine, depressurize, clean the leaking area, replace the sealing ring with one of the same specifications, and apply sealant. Check for weld cracks; minor cracks can be temporarily sealed with epoxy adhesive. For severe leaks, the entire assembly must be removed and sent for professional repair to prevent oil-water mixing and further malfunctions.

Long-term scale buildup or corrosion of the cooling medium reduces heat transfer performance, decreasing temperature difference and hindering heat dissipation. The coolant should be drained immediately, and the internal water passages should be circulated and cleaned with a specialized cleaning agent to remove scale and impurities. Check the coolant quality and replace with coolant of the correct specifications. After cleaning, thoroughly purge air to prevent air locks from affecting heat dissipation.

Copper pipes may freeze and crack, or vibrate and wear may cause oil-water cross-contamination, resulting in oil floating on the coolant surface or emulsified engine oil. In an emergency, stop the machine immediately, remove the radiator core, and drain all internal fluids. Minor damage can be plugged with a special plug; severe damage requires replacement of the entire assembly. After repair, a pressure test must be performed to ensure a tight seal and prevent cross-contamination that could damage the engine or hydraulic system.