HARNESS AS-CONTROL 2757930 - Caterpillar

Hot oil and hot components can cause personal injury. Do not allow hot oil or hot components to contact skin.
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 g06181120
Park the machine on level ground. Lower the bucket to the ground with the stick in a vertical position, as shown.
Illustration 2 g06219991
Open the access door on the right side of the machine.
Illustration 3 g06182648
(A) High temperature range
(B) Low temperature range
(C) Mid temperature range
If the hydraulic oil temperature is between 10° to 30° C (50° to 86° F), maintain the oil level in low temperature range (B). If the hydraulic oil temperature is between 50° to 80° C (122° to 187° F), maintain the oil level in high temperature range (A). If the hydraulic oil temperature is between 31° to 49° C (87° to 121° F), maintain the oil level in mid temperature range (C).
Close the access door.Note: Perform Step 5 through Step 8 if the oil level is low.Note: Refer to Operation and Maintenance Manual, "General Hazard Information" for information that pertains to Containing Fluid Spillage.
Pressurized system!The hydraulic tank contains hot oil under pressure. To prevent burns from the sudden release of hot oil, relieve the tank pressure with the engine off. Relieve pressure by slowly turning the cap until the cap reaches the secondary stop.
Illustration 4 g06182653
Illustration 5 g06184990
Filler cap
(A) LOCK position
(B) PRESSURE RELEASE - START position
(C) PRESSURE RELEASE - END position
(D) OPEN position
Release the pressure that may be present in the return hydraulic circuit with the following procedure. Refer to Illustration 5 for filler cap positions.
Turn the filler cap counterclockwise and move the arrow from position (A) to position (B).
Release the pressure for a minimum of 45 seconds by moving the arrow from position (B) to position (C).
Move the arrow from position (C) to position (D).
After the tank pressure is relieved, remove the filler cap.
Add oil if necessary. See Operation and Maintenance, "Lubricant Viscosities"
Check the O-ring seal on the filler cap. Replace the O-ring seal if the seal is damaged.
Clean the filler cap and install on the tank. Tighten the filler cap on the hydraulic tank to position (A).