MTS Series 505G2 SilentFlo Hydraulic Power Unit Model 505G2-180 User Manual
Page 47
Warning:
Precharging with a gas other than dry nitrogen will cause the existing nitrogen within the surge
suppressor to be mixed with the new gas.
Mixing gases can produce unpredictable results.
Use only dry nitrogen gas to precharge the 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.
Caution:
Do not transfer gas from a supply bottle to an accumulator at a high rate.
Pressure differentials higher than 2.1 MPa (300 psi) across the input check valve in an
accumulator can damage valve seals.
When charging an accumulator, transfer gas from the supply bottle at a low rate. Gradually
open the regulator valve on the bottle just enough to transfer gas from the bottle to the
accumulator.
6. Slowly open the regulator shut-off valve until gas is heard escaping from the accumulator charging kit
bleed valve. Allow gas to slowly escape for approximately ten seconds, and then close the bleed valve.
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.
Series 505G2 SilentFlo™ Hydraulic Power Unit Product Information 47
Installation