Case 580SR Service Manual page 652

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62
Readings and Results
One of three conditions will apply: the precharge pressure in the accumulator will be correct, or it will be too
high or too low.
Nitrogen Pressure p
Z Screw the handwheel (A) counterclockwise to close the accumulator gas valve.
Z Slacken the bleed valve (B) to release pressure in the UCA.
Z Unscrew the UCA from the adapter.
Z Unscrew the adapters from the accumulator gas valve.
Nitrogen Pressure p
Z Slacken the bleed valve (B) to vent nitrogen from the accumulator until, after stabilization, the desired pres-
sure p is registered. Nitrogen vents into the air.
o
Z Tighten the bleed valve (B) once the desired filling pressure is reached.
Z Screw the handwheel (A) counterclockwise to close the accumulator gas valve.
Z Slacken the bleed valve (B) to release pressure in the UCA.
Z Unscrew the UCA from the adapter.
Z Unscrew the adapters from the accumulator gas valve.
Nitrogen Pressure p
Z Close the inflation valve (A) by screwing the handwheel counterclockwise.
Z Remove the cap (8).
Z Connect the end of the hose (9) to the valve (10).
Z Connect the other end of the hose to the nitrogen source.
Z Progressively open the valve on the nitrogen source.
Z Screw the handwheel (A) clockwise to admit the pressurized gas, taking particular care if the accumulator has
a small capacity.
Z When pressure p
transfer, the accumulator should be allowed to stand for a minimum of 15 minutes to allow the temperature to
stabilize before a final reading of the precharge pressure is taken.
Z Screw the handwheel (A) counterclockwise to close the accumulator gas valve.
Z Slacken the bleed valve (B) to release pressure in the UCA.
Z Remove the hose carefully, to release internal pressure.
Z Refit the cap (8) on the valve (10).
Z Unscrew the UCA from the adapter(s).
Unscrew the adapters from the accumulator gas valve. After removing the UCA and adapter(s), make sure that
the accumulator gas valve (13) is sealing effectively. Refit the gas valve dust cap (12) and replace the protec-
tive cover (11).
SECTION 35 - HYDRAULIC SYSTEM
is Correct
o
is Too High
o
is Too Low
o
is reached, close the valve on the nitrogen source. To allow for the effects of temperature
o
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