21836 Mercury O-RING, (.796 x .139), X-Long

Selecting the Viscosity
In order to select the proper oil for each machine compartment, refer to the “Lubricant Viscosity for Ambient Temperature” table. Use the oil type AND oil viscosity for the specific compartment at the proper ambient temperature.The proper oil viscosity grade is determined by the minimum ambient temperature (the air in the immediate vicinity of the machine). Measure the temperature when the machine is started and while the machine is operated. In order to determine the proper oil viscosity grade, refer to the “Min” column in the table. This information reflects the coldest ambient temperature condition for starting a cold machine and for operating a cold machine. Refer to the “Max” column in the table for operating the machine at the highest temperature that is anticipated. Unless specified otherwise in the “Lubricant Viscosities for Ambient Temperatures” tables, use the highest oil viscosity that is allowed for the ambient temperature.Machines that are operated continuously should use oils that have the higher oil viscosity in the final drives and in the differentials. The oils that have the higher oil viscosity will maintain the highest possible oil film thickness. Refer to “General Information for Lubricants” article, “Lubricant Viscosities” tables, and any associated footnotes. Consult your Cat dealer if additional information is needed.
Not following the recommendations found in this manual can lead to reduced performance and compartment failure.
Engine Oil
Cat oils have been developed and tested in order to provide the full performance and life that has been designed and built into Cat engines.Cat DEO-ULS or oils that meet the Cat ECF-3 specification and the API CJ-4 are required for use in the applications listed below. Cat DEO-ULS and oils meeting Cat ECF-3 specification and the API CJ-4 and ACEA E9 oil categories have been developed with limited sulfated ash, phosphorus, and sulfur. These chemical limits are designed to maintain the expected aftertreatment devices life, performance, and service interval. If oils meeting the Cat ECF-3 specification and the API CJ-4 specifications are not available, oils meeting ACEA E9 may be used. ACEA E9 oils meet the chemical limits designed to maintain aftertreatment device life. ACEA E9 oils are validated using some but not all ECF-3 and API CJ-4 standard engine performance tests. Consult your oil supplier when considering use of an oil that is not Cat ECF-3 or API CJ-4 qualified.Failure to meet the listed requirements will damage aftertreatment-equipped engines and can negatively impact the performance of the aftertreatment devices. The Diesel Particulate Filter (DPF) will plug sooner and require more frequent DPF ash service intervals.Typical aftertreatment systems include the following:
Diesel Particulate Filters (DPF)
Diesel Oxidation Catalysts (DOC)
Selective Catalytic Reduction (SCR)
Lean NOx Traps (LNT)Other systems may apply.
Table 1
Lubricant Viscosities for Ambient Temperatures
Compartment or System Oil Type and Performance Requirements Oil Viscosities °C °F
Min Max Min Max
Engine Crankcase Cat DEO-ULS Cold Weather SAE 0W-40 −40 40 −40 104
Cat DEO-ULS SYN SAE 5W-40 −30 50 −22 122
Cat DEO-ULS SAE 10W-30 −18 40 0 104
Cat DEO-ULS SAE 15W-40 −9.5 50 15 122 Hydraulic Systems
Refer to the “Lubricant Information” section in the latest revision of the Special Publication, SEBU6250, "Caterpillar Machine Fluids Recommendations" for detailed information. This manual may be found on the Web at Safety.Cat.com.The following are the preferred oils for use in most Cat machine hydraulic systems:
Cat HYDO Advanced 10 SAE 10W
Cat HYDO Advanced 30 SAE 30W
Cat BIO HYDO AdvancedCat HYDO Advanced fluids have a 50% increase in the standard oil drain interval for machine hydraulic systems (3000 hours versus 2000 hours) 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 for your particular machine. When switching to Cat HYDO Advanced fluids, cross contamination with the previous oil should be kept to less than 10%.Second choice oils are listed below.
Cat MTO
Cat DEO
Cat DEO-ULS
Cat TDTO
Cat TDTO Cold Weather
Cat TDTO-TMS
Cat DEO-ULS SYN
Cat DEO SYN
Cat DEO-ULS Cold Weather
Table 2
Lubricant Viscosities for Ambient Temperatures
Compartment or System Oil Type and Performance Requirements Oil Viscosities °C °F
Min Max Min Max
Hydraulic System CatHYDO Advanced 10
Cat TDTO SAE 10W −20 50 −4 122
Cat HYDO Advanced 30
Cat TDTO SAE 30 10 50 50 122
Cat BIO HYDO Advanced "ISO 46" Multi-Grade −30 50 −22 122
Cat MTO
Cat DEO-ULS
Cat DEO SAE10W-30