MTS Series 505 SilentFlo Hydraulic Power Unit Model 505-11 - Manual (Page 73)

Precharging the Surge Suppressor Accumulator
Model 505.07/.11 SilentFlo™ HPU Accessories 73
Mixing gases can produce unpredictable results.
Do not use another gas to precharge a surge suppressor.
Use only dry nitrogen gas to precharge surge suppressors.
3. Connect the nitrogen supply hose from the supply bottle pressure regulator
output to the input check valve on the charging kit.
4. Open the nitrogen bottle valve. Check the nitrogen bottle pressure gage on
the regulator. (The bottle must contain sufficient pressure to provide an
adequate gas volume.)
5. Monitor the regulator output pressure gage and adjust the regulator output
pressure valve to the required level.
Avoid rapid and extreme pressure transitions.
Rapid flow rates with pressure differentials of more than 2.1 MPa (300 psi)
across the input check valve can damage the valve seal(s).
Do not allow rapid flow rates. Open the regulator shut-off valve only far enough to
permit a gradual transfer of gas.
6. Slowly open the regulator shut-off valve until gas is heard escaping from the
accumulator charging kit bleed valve.
A. Allow gas to slowly escape for approximately ten seconds, and then
close the bleed valve.
B. Immediately close the regulator shut-off valve before the pressure
reading on either the high or low charging kit pressure gage exceeds the
pressure level of the accumulator.
7. Open the locknut. Slowly open the regulator shut-off valve until the pressure
indicator on either the high or low charging kit pressure gage begins to rise.
When the pressure is at the required pressure level, close the regulator shut-
off valve.
8. Close the locknut.
9. Open the bleed valve on the charging kit and remove the chuck valve from
the accumulator.
10. Install the valve stem cap and protective cover. Close the valve on the
nitrogen bottle.
WARNING
CAUTION