SEAL-LIP TYPE 9X7720 - Caterpillar

Caterpillar Products All MachinesA change has been made to Service Magazine, SEPD1903, 16, December 2014, "Extended Life Coolant (ELC) Extender Is No Longer Required". The content of the article has changed. Disregard this article and refer to the following.Reference: Operation and Maintenance Manual, SEBU6250, Coolant RecommendationsReference: Operation and Maintenance Manual, SEBU6251, Coolant RecommendationsNitrites in Extended Life Coolant (ELC) can react with the aluminum cooler to produce elevated pH and low nitrite levels in Schedule Oil Sampling (S∙O∙S) samples. An odor of ammonia may also be detected in these samples. The cooler is not damaged during this depletion of nitrite.As there are multiple issues that can contribute to the depletion of nitrite, Cat S∙O∙S Level 2 coolant analysis is crucial to the confirmation of the issue discussed in this publication. Contact your local Cat dealer to request Level 2 coolant analysis if nitrite depletion is experienced.Cat ELC will continue to be recommended for most Caterpillar diesel engines. Refer to the coolant specifications in SEBU6250 and SEBU6251 and the engine Operation and Maintenance Manual for exceptions.ELC is formulated to provide cavitation erosion protection of aluminum and cast iron components. Most of this protection is provided by Organic Additive Technology (OAT), which depletes slowly and provides extended life to the coolant.As a backup to the protection from OAT, Cat ELC formulation also contains nitrites. However, the rate of depletion of nitrite in Cat ELC varies.Field Follow Observations
During the field follow of machines, nitrite depletion from 500 parts per million (ppm) to 0 ppm was observed. Simultaneously, the pH level of the coolant increased, and the odor of ammonia appeared. Continued operation of the field follow machines at 0 ppm nitrite showed a disappearance of the ammonia smell and the pH level returned to normal levels. The cooling systems continued to function normally throughout the field follow period.In some cases, Cat ELC Extender was added to