Leaderboard

Filling the accumulator doesn't honestly do much to prevent an air bubble. It's the removing of the hydraulic line to the accumulator that create the issue No matter how fast you are in getting it capped, you will induce a large volume of air into the lines. I was a hydraulic tech on C-130E/H/J for 13 years. When you think you have the system bled enough, do another 10 cycles.

The suction boost pumps located near the reservoirs are used to provide a positive hydraulic pressure of 70-l 10 PSI to the suction side of each engine driven pump when turned on. This pressure prevents cavitation and helps to “prime” an engine driven pump should air get into the suction line. If the reservoir fluid level is kept within limits and correct maintenance procedures are followed, air will not enter the system. When a hydraulic component is replaced, the cavities of the new unit should be filled with system fluid (MI L-H-5606) just before installation to minimize entrapment of air. This is especially true when replacing engine driven pumps, Always fill the pump case to overflowing through the case drain port. Also, retain as much fluid as possible in disconnected tubing during component changes. Become familiar with all the instructions in your maintenance manuals to avoid extra expense - and work. Munir Abbasi Home of Hercules Pakistan