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9/8/98 AC 43.13-1B technician refer to the troubleshooting infor mation furnished by the manufacturer. (1) Lack of pressure in a system can be caused by a sheared pump shaft, defective re lief valve, the pressure regulator, an unloading valve stuck in the “kicked-out” position, lack of fluid in the system, the check valve installed backward, or any condition that permits free flow back to the reservoir or overboard. If a system operates satisfactorily with a ground test unit but not with the system pump, the pump should be examined. (2) If a system fails to hold pressure in the pressure section, the likely cause is the pressure regulator, an unloading valve, a leak ing relief valve, or a leaking check valve. (3) If the pump fails to keep pressure up during operation of the subsystem, the pump may be worn or one of the pressure-control units may be leaking. (4) High pressure in a system may be caused by a defective or improperly-adjusted pressure regulator, an unloading valve, or by an obstruction in a line or control unit. (5) Unusual noise in a hydraulic system, such as banging and chattering, may be caused by air or contamination in the system. Such noises can also be caused by a faulty pressure regulator, another pressure-control unit, or a lack of proper accumulator action. (6) Maintenance of hydraulic system components involves a number of standard practices together with specialized procedures set forth by manufacturers such as the re placement of valves, actuators, and other units, including tubing and hoses. Care should be exercised to prevent system contamination damage to seals, packings, and other parts, and to apply proper torque in connecting fittings. When installing fittings, valves, etc. always lubricate the threads with hydraulic fluid. (7) Overhaul of hydraulic and pneu matic units is usually accomplished in ap proved repair facilities; however, replacement of seals and packings may be done from time to time by technicians in the field. When a unit is disassembled, all O-ring and Chevron seals should be removed and replaced with new seals. The new seals must be of the same material as the original and must carry the cor rect manufacturer’s part number. No seal should be installed unless it is positively iden tified as the correct part and the shelf life has not expired. (8) When installing seals, care should be exercised to ensure that the seal is not scratched, cut, or otherwise damaged. When it is necessary to install a seal over sharp edges, the edges must be covered with shim stock, plastic sheet, or electrical tape. (9) The replacement of hydraulic units and tubing usually involves the spillage of some hydraulic fluid. Care should be taken to ensure that the spillage of fluid is kept to a minimum by closing valves, if available, and by plugging lines immediately after they are disconnected. All openings in hydraulic sys tems should be capped or plugged to prevent contamination of the system. (10) The importance of the proper torque applied to all nuts and fittings in a sys tem cannot be over-emphasized. Too much torque will damage metal and seals, and too little torque will result in leaks and loose parts. The proper torque wrenches with the appropri ate range should be used in assembling system units. f. Disposal of Used Hydraulic Fluids. In the absence of organizational guidelines, the Par 9-29 Page 9-17PDF Image | AFS-640
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