Koso REXA Electraulic Xpac, Installation And Operation Manual

Page: 111 / 164

REXA
Electraulic Actuators & Drives
Xpac
Installation Manual -- Version 5.1 (5/08)
G-9
G.4 NITROGEN FILLING & DEPRESSURIZING
CAUTION!
THE ACCUMULATOR CONTAINS HIGH PRESSURE NITRO-
GEN GAS. FAILURE TO PROPERLY FOLLOW PROCEDURES
MAY RESULT IN PERSONAL INJURY AND/OR DAMAGE TO
EQUIPMENT.
REXA accumulators are shipped pre-charged from the factory.
During normal use the accumulator should not require additional
charging with nitrogen. If the accumulator pre-charge is sus-
pected of being low or lost, the accumulator will need servicing or
overhaul in order to determine the source of nitrogen loss. REXA
highly recommends returning the accumulator to the factory for
service, overhaul and recharging due to the specialized skills and
equipment required for these operations.
G.4.1 ACCUMULATOR CHARGING INSTRUCTIONS
1. Remove gas valve guard and gas valve cap.
2. Back gas chuck “T” handle all the way out (counter
clockwise) before attaching charging assembly to
accumulator gas valve.
3. Close bleed valve.
4. Making sure not to loop or twist the hose, attach
swivel nut to gas valve and tighten (10-15 in-lbs)
5. Turn gas chuck “T” handle all the way down (clock-
wise). This will depress core in gas valve.
6. Crack open nitrogen bottle valve and slowly fill ac-
cumulator. Shut off when gauge indicates 2000 psi.
7. Let the pre-charge set for 10 to 15 minutes. This
will allow the gas temperature to stabilize. If the de-
sired pre-charge is exceeded, close nitrogen bottle
valve, then slowly open bleed valve. Do not reduce
pre-charge by depressing accumulator valve core
with a foreign object!
8. When finished charging accumulator, turn “T” handle
all the way out on gas chuck then open bleed valve.
9. Hold gas valve to keep from turning, loosen swivel
nut and remove assembly.
10. Replace gas valve cap (10-15 in-lb) and gas valve
guard. Gas valve cap serves as a secondary seal.
!