MTS Systems 111 Series, Product Information

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Series 111 Accumulators 14 Maintenance
Checking the Series 111 Accumulator Precharge
The Series 111 Accumulators use the poppet-type valve (as shown on the
previous page).
1. Connect the charging kit chuck valve to the accumulator valve stem.
2. With an open-end wrench, turn the locknut counterclockwise on the
accumulator valve assembly to open the valve. Read the pressure on
either the high or low accumulator charging kit pressure gage.
• If the pressure reading is other than the required pressure level
recorded on the accumulator, go to the procedure
“Changing the
Precharge Pressure” on page 15.
• If the pressure level corresponds to the level recorded on the
accumulator label, turn the locknut clockwise to close the valve
and continue this procedure.
3. Open the bleed valve on the accumulator charging kit and remove the
chuck valve from the accumulator. Replace the valve stem cap and
protective cover on the accumulator.
Checking a Non-MTS Accumulator Precharge
Non-MTS accumulators typically use either a poppet type valve or a core
type valve (as shown on the previous page).
1. Determine which type of gas pressure valve is present on the
accumulator and connect the charging kit chuck valve to the
accumulator valve stem.
2. Open the locknut (poppet-type) or chuck valve (core-type).
Note The poppet-type valve opens by turning the locknut counterclockwise
and closes by turning the locknut clockwise. To open a core type valve,
attach a chuck valve to the valve stem and turn the chuck valve handle
clockwise to depress the valve core. Close the valve by turning the
handle counterclockwise.
3. Read the pressure on either the high or low accumulator charging kit
pressure gage. The low pressure gage is limited to approximately 1.4
MPa (200 psi) by the gage protector.
• If the pressure reading is other than the required pressure level
recorded on the accumulator, go to the procedure
“Changing the
Precharge Pressure” on page 15.
• If the pressure level corresponds to the level recorded on the
accumulator label, close the locknut (poppet-type) or close the
chuck valve (core-type). Continue to Step 4.
4. Open the bleed valve on the accumulator charging kit and remove the
chuck valve from the accumulator. Replace the valve stem cap and
protective cover on the accumulator.