CORE ASSEM. 8L4505 - Caterpillar

Selection of the Oil Change Interval
Your machine may be able to use a 4000 hour interval for the hydraulic oil. The hydraulic oil is in the system that is not integral to the service brakes, the clutches, the final drives, or the differentials. The standard change interval is 2000 hours. The oil should be monitored in additional increments of 500 hours. The extended 4000 hour interval can be used if the following criteria are met.HYDO Advanced 10
Cat hydraulic oil "HYDO Advanced 10" is the preferred oil for use in most Caterpillar machine hydraulic systems and hydrostatic transmission systems when ambient temperature is between −20 °C (−4 °F) and 40 °C (104 °F). Cat hydraulic oil "HYDO Advanced 10" has a viscosity grade of SAE 10W. Cat hydraulic oil "HYDO Advanced 10" has a 50% increase in the standard oil drain interval. This is up to 3000 hours for machine hydraulic systems over second and third choice oils when you follow the maintenance interval schedule for oil filter changes and for oil sampling that is stated in the Operation and Maintenance Manual. A 6000 hour oil drain interval is possible when you use the "Scheduled Oil Sampling Program" (S O S). When you switch hydraulic oil to Cat hydraulic oil "HYDO Advanced 10", maintain the cross contamination with the previous oil at less than 10%. Consult your Cat dealer for details about the benefits from the improved performance that is designed into Cat hydraulic oil "HYDO Advanced 10".Oil Filters
Caterpillar oil filters are recommended. The interval for changing the oil filter should be 500 hours.Oil
The 4000 hour interval for changing the oil is for the following oil types.
Caterpillar Hydraulic Oil (HYDO)
CaterpillarTransmission/Drive Train Oil (TDTO)
Caterpillar TDTO (TMS)
Caterpillar Diesel Engine Oil
Caterpillar Biodegradable Hydraulic Oil (HEES)
Caterpillar Multipurpose Tractor Oil (MTO)
Heavy-Duty Diesel Engine Oil with a minimum zinc content of 900 parts per million (ppm) Heavy-duty oils are identified by the following classifications: Cat ECF-1, API CF, API CG-4 and TO-4. Cat ECF-1, API CF, API CG-4 and TO-4 oils must have a minimum zinc additive of 900 parts per million (ppm) in order to be considered acceptable for use in a hydraulic system.Note: Industrial hydraulic oils are not recommended in Caterpillar hydraulic systems. These oils are more likely to cause corrosion and excessive wear.Monitoring the Condition of the Oil
The oil should be monitored during intervals of 500 hours. Caterpillar's standard S O S Fluids Analysis or an equivalent oil sampling program should be used.The current guidelines for cleanliness of the oil should be observed. Refer to "Measured Data".If an oil sampling program is not available, the standard 2000 oil change interval should be used.Measured Data
The following information should be monitored when you sample the oil:
Significant changes in wear metals should be monitored. These metals include iron, copper, chromium, lead, aluminum, and tin.
The following additives should be observed for significant changes: Zinc, calcium, magnesium and phosphorus.
Contaminants should not be present. These contaminants include fuel and antifreeze. Water content should be .5 percent or less.
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