MTS Series 505G2 SilentFlo Hydraulic Power Unit Model 505G2-30 - Manual (Page 35)

Precharging the Surge Suppressor Accumulator
Model 505G2.20 - 505G2.30 SilentFlo™ HPU Installation 35
Precharging the Surge Suppressor Accumulator
The surge suppressor smooths out the ripple caused by the pulsing action of the
pump as it pressurizes the hydraulic fluid. The surge suppressor is a cylinder that
has an outer sleeve that is pressurized with nitrogen. The gas pressurized sleeve
dampens the pressure pulses.
The surge suppressor is mounted to the output of the hydraulic pump inside the
reservoir.
It is normal for a small amount of surge suppressor precharge loss to occur during
operation. Because of this gradual reduction in precharge pressure, the pressure
should be checked and recharged (if necessary) at regular intervals.
Determining a
pressure check
interval
The precharge pressure checking intervals of your surge suppressor depends on
how your system is used. Vigorous use causes more rapid pressure loss and thus
requires checking and recharging more often.
Initially, check the surge suppressor precharge pressure every month or 160
operating hours. If the precharge pressure changes more than 1.4 MPa (200 psi)
during this time period, recharge the surge suppressor and check the pressure
twice as often in the future. If the precharge pressure changes less than 1.4 MPa
(200 psi), check the pressure half as often.
When you have established a regular interval for checking the precharge
pressure, note the amount of pressure loss that occurs each time the pressure is
checked. An increase in pressure loss during the period between checks might
indicate that the surge suppressor seals or bladder require replacement.