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large syringe (or the original container) full of baby oil connected to the bladder permanently.
Watch the return line and the plastic cup, as it will fill quickly with every cycle.
When no air bubbles are visible in the return line during the cycles, connect the return line to the
bladder. Make sure the bladder is air free. It should be filled with oil approx. 25mm (1") thick.
Then cycle the system a few more times, trying to logically imagine possible air pockets in the
cylinders, moving and turning the complete center wing to try to get the air pockets placed right in
front of the cylinder's tube fittings, forcing them out of the return lines during the cycles. This air
will collect in the bladder and must be released as the final step of the priming procedure. After all
air is out slide both outer wing panels on, secure them with the fixing bolts and increase operating
pressure to 6 bar. Then cycle the system again to test the speed of movement. Ideally, the pump
should operate in 1 second intervals, switching on and off during the cycle. If the pump runs
constantly during the cycle, reduce the pressure in the accumulator. If the cylinders do not safely
reach the end positions, especially in the DOWN position, increase the pressure in the
accumulator. If the pump switches on and off in 1-second intervals approximately, you have found
the correct operating pressure.
Page 41
Instruction Manual F4U-1D Corsair
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