FILM 1677270 - 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.
Illustration 1 g00102817
The hydraulic oil tank is on the right side of the machine.
Park the machine on level ground. Lower the bucket to the ground with the stick in a vertical position, as shown.
Illustration 2 g00101347
ExcavatorPosition the machine with the stick in the vertical position and the implement on the ground.
Illustration 3 g00368266
Excavator with VA boomRetract the stick cylinder. Extend the boom cylinders. Place the bucket on the ground.
Illustration 4 g00368271
Super long demolitionCompletely raise the boom and position the tool as close as possible to the machine.
Illustration 5 g00270080
Material handlerCompletely raise the boom and fully retract the stick cylinder.
Illustration 6 g00368333
Coal shovelPosition the bucket on the ground and position the bucket as close as possible to the machine.
Position the machine in a position that is shown in illustration 2, 3, 4, 5, or 6.
Illustration 7 g00102818
Open the access door on the right side of the machine.
Illustration 8 g00687286
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 9 g00687449
Note: Refer to Operation and Maintenance Manual, "General Hazard Information" for information that pertains to Containing Fluid Spillage.Note: Perform Step 6 through Step 8 if the oil level is low.
Slowly loosen the fill/vent plug in order to relieve any pressure. Add oil, if necessary.
Check the O-ring seal of the fill/vent plug. Replace the O-ring seal if the O-ring seal is damaged.
Clean the fill/vent plug and install the fill/vent plug.