Endurance Pump Tests With Fresh and Purified MIL-H-5606 Hydraulic Fluid Historic Resources Survey
Final rept. 1995-1998
AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
Pagination or Media Count:
There has been a move in the U.S. Armed Forces to begin using additional purifiers to clean up used hydraulic fluid for continued use to reduce the hydraulic fluid waste stream. Two 1500 hour pump tests were conducted to study if the fluid purification had any adverse impact on the life of aircraft hydraulic pumps. Pump tests with both fresh and purified MIL-H-5606 fluids were successfully completed, and there was no apparent difference in pump performance with either fluid. In test with fresh MIL-H-5606, the main shaft that acts as the inner race for the needle bearing, showed considerable spalling. Polishing wear was observed on most of the pump parts except that there was some erosion on the cylinder block face and on the piston shoe faces. The erosion on the piston shoe faces was somewhat more with the purified fluid than observed in the test with fresh MIL-5606. No degradation in the pump performance was observed due to shaft spalling or the erosion on cylinder block and piston shoe faces.
- Hydraulic and Pneumatic Equipment