Mea Hawk - 5-8 Accumulator;Reservoir Fluid and Nitrogen Fill Procedure

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MEA Incorporated | Hawk Actuator Instruction and Operation Manual
02/2018 34
2) Remove the protective caps from the nitrogen fill ports of the accumulator and reservoir.
3) Measure and record the nitrogen pressure in both the accumulator and reservoir.
4) Vent nitrogen from both the accumulator and reservoir so that the internal pressure is roughly 0
psi.
5) Break tubing fitting on the accumulator and drain the stored hydraulic fluid. It may be necessary
to apply low pressure air (0-10 psi) to the nitrogen fill port to move the accumulator piston until it
dead ends, forcing hydraulic fluid out in the process.
6) Break tubing fitting on the reservoir and drain the stored hydraulic fluid. It may be necessary to
apply low pressure air (0-10 psi) to the nitrogen fill port to move the reservoir piston until it dead
ends, forcing hydraulic fluid out in the process.
5-8 Accumulator/Reservoir Fluid and Nitrogen Fill Procedure
Note: Before beginning the accumulator system filling process the Hydraulic Power Source (HPS) and
actuator must be completely filled with hydraulic fluid. Refer to the Hydraulic Power Source (HPS) &
Actuator Fill Procedure
Note: Before beginning the accumulator system filling process the accumulator and reservoir should be
completely drained of hydraulic fluid. Refer to the Accumulator/Reservoir Drain Procedure.
1) Close the shutoff ball valves located upstream of the accumulator and reservoir.
2) Remove reservoir from its mounting bracket and position it so that its open hydraulic fluid fill port
is facing upwards.
3) The reservoir piston must now be manually positioned such that the reservoir holds an
appropriate amount of hydraulic fluid to completely fill the actuator cylinder during a failure.
MEA recommends that the reservoir hold a volume of hydraulic fluid that is 1.25x the actuator
cylinder volume. Using a spare piece of 3/8” tubing inserted into the hydraulic fluid fill port of the
reservoir push the piston downward a distance equal to the “Reservoir Initial Piston Distance”
listed on the actuator’s specification sheet. For precision movement gently tap the end of the
tubing with a hammer. Excessive force should not be necessary to move the piston.
4) With the reservoir piston repositioned, fill the reservoir with hydraulic fluid completely to the top
of the fill port.
5) Temporarily cover the open hydraulic fill port while the reservoir is reinstalled in its mounting
bracket.