Electrical tools must be connected to a low resistance ground
Maintenance of Shop Equipment. Maintenance of shop equipment consists of cleaning, preventive
maintenance, and replacement of defective parts. Preventive maintenance includes before-operation, during-operation,
after-operation services performed by operator, and scheduled services to be performed at designated intervals. Consult
the operation and service instructions manual for specific maintenance instructions on particular types of equipment.
Hydraulic Filler and Bleeder Unit. The hydraulic filler and bleeder shown in figure 3-1 is used for servicing
and bleeding aircraft hydraulic systems and associated hydraulic equipment. The unit consists of a hydraulic fluid
storage tank with an air pressure indicator, air filler and fluid filler valve, and a servicing hose and valve. The following
are general instructions for maintenance and service.
Do not attempt to service or perform maintenance on filler and bleeder unit until all air pressure has been
released. Failure to comply can result in damage to equipment or personnel.
Do not use any filler and bleeder unit unless it is equipped with a safety relief valve to bleed off excessive
air pressure. Failure to comply can result In injury or death.
Drycleaning solvent Is flammable and solvent vapors are toxic. Use P-D-680, Type II Solvent in a well-
ventilated area. Keep away from open flames. Avoid prolonged solvent contact with skin.
Clean reservoir and fittings with a cloth moistened in drycleaning solvent, Federal Specification P-D-
680, and wipe dry with a clean cloth.
Figure 3-1. Typical Hydraulic System Filler and Bleeder
Calibration of hydraulic gauges is accomplished in the instrument shop which is equipped with hydraulic
Instruments Oil preservatives, MIL-H-6083, will be utilized at time of overhaul during depot maintenance
as a calibrating medium in lieu of test fluid, MIL-H-5606 Recalibration of flow indicators on test stands will
be required if the fluid for which the equipment is calibrated does not conform to the requirements of oil
Remove corrosion, where paint has chipped, by scouring with crocus cloth, Federal Specification P-C-