Hydraulic hose fittings troubleshooting vary according to the complexity of the system and also the components in the system. It is, therefore, important how the technician refer to the troubleshooting information furnished from manufacturer.
Relief valves deal with. lack of pressure in a system can be caused by a sheared pump shaft, defective relief valves needing repair, regional aircraft control valves, the pressure regulators, unloading valves stuck in the 'kicked-out' position, lack of fluid in the system, the check valves installed backward, or any condition that permits free flow back to the reservoirs or crazy. If a system operates satisfactorily with a ground test unit but not making use of system pump, the hydraulic pumps should be examined.
If a system fails to hold pressure in be successful section, the likely cause is the stress regulator, an unloading valve, leaking relief valves nodding repair, or a leaking check valve. If the pump fails to keep pressure up during operation of the subsystem, the pump may be worn or one of this pressure-control units may be leaking. High pressure in a system may be caused by a defective or improperly-adjusted pressure regulator, an unloading valve, or by a blockage in a line or control program. Unusual noise in a hydraulic system, regarding banging and chattering, may be coming from air or contamination in the system. Such noises can also be the consequence of a faulty pressure regulator, another pressure-control unit, or an associated with proper accumulator sex.
Commuter aircraft hydraulics overhaul, maintenance of hydraulic system components, involves an associated with standard practices along with specialized procedures established by manufacturers such as the replacement of relief valves, actuators, as well units, including tubing and hoses. Care should be exercised to prevent system contamination damage to seals, packing, along with other parts, and to make use of proper torque in connecting fittings. When installing hydraulic fittings, valves, etc. always lubricate the threads with hydraulic nectar.
Overhaul of hydraulic and pneumatic units is usually accomplished in approved repair facilities; however, replacing of seals and pickings may be done from time to time by technicians in the ground. When an 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 correct manufacturer's part number. No seal should be installed unless is actually positively identified while correct part and the shelf life has not expired.
When installing seals, care should be exercised to ensure that the seal is not scratched, cut, or cold 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. The replacing of hydraulic units and tubing usually necessitates the spillage of some hydraulic fluid. Care should be taken to ensure that the spillage of fluid is kept as small as possible by closing valves, if available, and through plugging lines after they are shut off. All openings in hydraulic systems should be capped or plugged to prevent contamination of the system.
The importance among the proper torque used for all nuts and Hydraulic hose fittings in a system 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 however appropriate range ought to used in assembling system units.