MTS Series 322 Load Frames - Manual (Page 83)

Series 322 Load Unit Maintenance 83
111 Accumulator: Check and Change Precharge Pressure
Special equipment
An accumulator charging kit (MTS part number 376986-01) is for any Series 111
Accumulator:
Prerequisite
To prepare the accumulator for precharge check:
Accumulators are pressurized devices.
Pressurized accumulators and their parts can become lethal projectiles if
disassembled and can cause death to persons and/or damage to
equipment.
Do not remove an accumulator that is pressurized. Completely remove hydraulic
pressure and discharge the accumulator before any parts, except the protective
cover and valve stem cap, are removed.
1. Ensure that system hydraulic pressure has been reduced to zero before
proceeding. To do this, turn off the hydraulic power unit and exercise the
actuator until it stops moving.
2. Close the bleed valve on the accumulator charging kit. Remove the
protective cover and valve stem cap from the accumulator.
Check the precharge
pressure
1. Connect the charging kit chuck valve to the accumulator valve stem.
WARNING