TANK GP-HYDRAULIC 3860480 - Caterpillar

Never remove the fill/vent plug from the hydraulic tank if the oil is hot.Air can enter the system and cause pump damage.
Note: The hydraulic oil tank is on the right side of the machine.
Park the machine on level ground.
Illustration 1 g00101347
Illustration 2 g00358613
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Position the machine in a position that is shown in Illustration 1, 2, 3, or 4.
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Open the access door on the right side of the machine.
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(A) High Temperature Range. (B) Low Temperature Range.
For a cold machine, maintain the hydraulic oil level in the low temperature range. For a machine that is at normal operating temperature, maintain the hydraulic oil level in the high temperature range.
Close the access door.
Illustration 7 g00101541
Note: Refer to Operation and Maintenance Manual, "General Hazard Information" for information on containing fluid spillage.
Slowly loosen the filler plug in order to relieve any pressure. Add oil, if necessary.
Check the O-ring seal of the filler plug. If necessary, replace the O-ring seal.
Clean the filler plug and install the filler plug.