MTS Series 311 Load Frame - Manual (Page 55)

Checking the Accumulators’ Precharge
Series 311 Load Frame Maintenance 55
Checking the Accumulators’ Precharge
An accumulators’ correct precharge pressure is written on its label. Begin by
checking precharge pressures at least once a month.
See the Series 111 Accumulator Product Information manual for the complete
details on checking the precharge intervals and servicing the accumulators.
Record both the pressures and the room temperature in a log book. Use these
readings as a basis for increasing or decreasing the interval between pressure
checks.
Generally, recharging is required when there is a change of ±1.4 MPa
(200 psi) in the pressure line accumulator or ±50% in the return line accumulator.