When the maximum pressure of an aircraft direct axis variable displacement piston hydraulic pump is lower than specified, it indicates a performance problem that needs to be addressed. The following analyzes the possible causes of this problem and potential troubleshooting strategies: 1. Insufficient pump capacity: One of the reasons for low maximum pressure may be that the pump does not have enough capacity to generate the required pressure. This can be the result of incorrect pump selection or wear of the pump components over time. In this case, the decommissioning strategy will involve replacing the pump with a higher capacity pump that meets the specified maximum pressure requirements. 2. Mechanical wear: The performance of hydraulic pumps can deteriorate over time due to mechanical wear such as worn seals, valves or pistons. This wear can lead to internal leaks and reduced efficiency, resulting in reduced pressure output. Elimination strategies here include inspecting and replacing worn components, ensuring proper seals, and restoring the pump to its original efficiency. 3. Contamination: Contamination in the hydraulic system, such as dirt, debris or particles in the fluid, can cause flow path restriction, resulting in pressure loss. It is vital to keep your hydraulic system clean and to change or clean the filters regularly to prevent contamination. Elimination strategies include thorough system cleaning, flushing of lines, and implementation of effective filtration to prevent further contamination. 4. Fluid degradation: Over time, hydraulic fluids degrade due to factors such as temperature, oxidation or moisture absorption. Degraded fluid will result in reduced pump performance and pressure output. Elimination strategies include periodic fluid analysis and periodic fluid replacement to maintain desired performance and maximum pressure. 90L180-KA-1-BC-80-T-C-C8-J-00-FAC-40-40-24 90L180KA1BC80TCC8J00FAC404024 90L180-KA-1-BC-80-T-C-F1-J-00-FAC-40-40-24 90L180KA1BC80TCF1J00FAC404024 90L180-KA-1-BC-80-T-M-C8-J-03-NNN-35-35-30 90L180KA1BC80TMC8J03NNN353530 90-L-180-KA-1-BC-80-T-M-C8-J-03-NNN-35-35-30 90L180KA1BC80TMC8J03NNN353530 90L180-KA-1-CD-80-S-M-F1-H-03-NNN-35-35-22 90L180KA1CD80SMF1H03NNN353522 90-L-180-KA-1-CD-80-S-M-F1-H-03-NNN-35-35-22 90L180KA1CD80SMF1H03NNN353522 90L180-KA-1-CD-80-T-C-F1-H-03-FAC-32-32-24 90L180KA1CD80TCF1H03FAC323224 90-L-180-KA-1-CD-80-T-C-F1-H-03-FAC-32-32-24 90L180KA1CD80TCF1H03FAC323224 90-L-180-KA-1-CD-80-T-C-F1-J-03-FAC-29-29-24 90L180KA1CD80TCF1J03FAC292924 90-L-180-KA-1-CD-80-T-C-F1-J-03-NNN-26-26-20 90L180KA1CD80TCF1J03NNN262620 5. Improper system design: The hydraulic system design may not be optimized to achieve the specified maximum pressure. Undersizing piping, improper valve selection, or incorrect component placement can all lead to pressure loss. In this case, the elimination strategy involved reviewing and modifying the system design to minimize pressure drop and improve overall efficiency. 6. Operating conditions: The operating conditions of the hydraulic system, such as extreme temperature, overload or high viscosity fluid, will affect the maximum pressure output. It must be ensured that the system operates within the specified limits and that the pump is compatible with the given operating conditions. Adjusting operating parameters or selecting a pump better suited to these conditions may be part of an elimination strategy. 7. System leakage: Internal or external leakage of the hydraulic system will cause pressure loss and maximum pressure reduction. Leaks can be seals, joints, valves or other components. Elimination strategies include a thorough inspection of the system to identify and repair any leaks and ensure proper sealing of the entire system. 8. Manufacturer Specifications: It is important to verify that the maximum pressure specified is accurate for the specific hydraulic pump model and aircraft application. In some cases, it may be necessary to re-evaluate the specified value in consultation with the pump manufacturer to ensure that it is feasible and achievable. 9. Insufficient hydraulic power supply: Insufficient hydraulic power supply to the pump will result in a decrease in maximum pressure. This can be caused by problems such as a weak hydraulic pump drive system, insufficient power source, or incorrect system settings. Elimination strategies will involve validating and optimizing the hydraulic power system, ensuring the pump drive system is functioning properly, and adjusting system settings as needed. 10. Improper pump calibration: Incorrect pump calibration will result in lower maximum pressure. Calibration involves adjusting various parameters such as stroke length, pressure compensator settings or feedback control mechanisms to achieve the desired performance. If the pump is not properly calibrated, it may not be able to produce the maximum pressure specified. Elimination strategies include recalibrating the pump according to the manufacturer's guidelines or consulting a qualified technician to ensure proper adjustment of pump parameters. 11. Temperature effects: Extreme temperatures can affect the performance of hydraulic pumps, including their maximum pressure capability. High temperatures cause the fluid to become thinner and less viscous, resulting in lower pressure output. Conversely, low temperatures increase fluid viscosity, resulting in higher internal friction and pressure loss. Elimination strategies will involve managing temperature within recommended operating ranges, implementing appropriate temperature control measures, and using hydraulic fluids appropriate for given temperature conditions. 12. System pressure loss: Due to factors such as pipe friction, excessive fittings or restrictive components, pressure loss will occur throughout the hydraulic system. These losses reduce the total pressure available at the pump outlet. Elimination strategies will involve reviewing the system layout, optimizing piping sizes, minimizing fittings, and ensuring the use of low pressure drop components to minimize system pressure loss and maximize pressure output. 90-L-180-KA-1-CD-80-T-C-F1-J-03-NNN-29-29-24 90L180KA1CD80TCF1J03NNN292924 90-L-180-KA-1-CD-80-T-C-F1-J-03-NNN-35-35-24 90L180KA1CD80TCF1J03NNN353524 90L180-KA-1-DE-80-D-M-C8-L-03-NNN-35-35-30 90L180KA1DE80DMC8L03NNN353530 90-L-180-KA-1-DE-80-D-M-C8-L-03-NNN-35-35-30 90L180KA1DE80DMC8L03NNN353530 90L180-KA-1-EF-80-T-C-C8-J-00-FAC-40-40-24 90L180KA1EF80TCC8J00FAC404024 90-L-180-KA-1-NN-80-S-C-F1-H-00-FAC-42-42-24-G005 90L180KA1NN80SCF1H00FAC424224G005 90-L-180-KA-1-NN-80-S-C-F1-H-00-NNN-42-42-28 90L180KA1NN80SCF1H00NNN424228 90-L-180-KA-1-NN-80-S-C-F1-H-05-FAC-35-35-24 90L180KA1NN80SCF1H05FAC353524 90-L-180-KA-1-NN-80-S-C-F1-J-03-FAC-35-35-24 90L180KA1NN80SCF1J03FAC353524 90L180-KA-1-NN-80-T-C-C8-J-03-FAC-32-32-24 90L180KA1NN80TCC8J03FAC323224 13. Fluid Compatibility: Incompatible hydraulic fluids will result in reduced pump performance and reduced maximum pressure. It is essential to use a hydraulic fluid specifically recommended by the pump manufacturer to ensure optimum performance. If the fluid used is incompatible or has different viscosity characteristics than desired, changing to a suitable fluid may be part of the elimination strategy. 14. Insufficient pump maintenance: Improper maintenance, such as infrequent inspections, lack of lubrication, or neglect of recommended maintenance intervals, can result in reduced performance and reduced maximum pressure. Elimination strategies will involve implementing a regular maintenance program, including lubrication, filter changes, and overall system inspections, to ensure pumps are operating at optimal levels. 15. Manufacturing defects or component failures: In some cases, lower maximum pressures can be attributed to manufacturing defects or component failures in the pump. This can include issues such as valve failure, damaged pistons, or misaligned components. Should such a defect or malfunction be found, the elimination strategy will involve contacting the manufacturer or a qualified service provider to repair or replace the defective component. It is important to perform a thorough analysis and troubleshooting process to determine the specific cause of the low maximum pressure of the aircraft's hydraulic pump. Based on the findings, an appropriate elimination strategy can be implemented to resolve the underlying problem and restore pump performance to meet specified maximum pressure requirements.