Warnings and Cautions - Section 22 OM2201 Page 22-4 A plate on the side of the hydraulic tank furnishes instructions for filling the hydraulic tank. Keep the system open to the atmosphere only as long as absolutely necessary to lessen chances of system contamination. Service the tank with clean Type C-4 hydraulic oil. All oil being put into the hydraulic tank should be filtered through 3 micron fil- ters. A caution decal is attached below the hydraulic tank oil level sight gauge. Check level with body down, engine stopped, and key switch OFF (to assure pres- sure has been relieved from system) before remov- ing filler cap.
Add oil per filling instructions, if oil level is below top of sight glass. A warning plate is attached to the frame above the hydraulic system (APU) quick disconnect fittings to alert technicians that high pressure hydraulic oil is present during operation. Care must be taken when it is necessary to open the hydraulic system. There is always a chance of residual pressure being present. Open fittings slowly to allow any pressure to bleed off before removing any connections. Any operating fluid, such as hydraulic oil, escap- ing under pressure can have sufficient force to enter a person's body by penetrating the skin.
Serious injury and possibly death may result if proper medical treatment by a physician familiar with this injury is not received immediately.