Series 111 Accumulator: Check And Change Precharge Pressure; Equipment; Prerequisites - MTS Systems Landmark 370 Series Product Information

cylinder. To check the approximate piston location, note the warm-to-hot transition point on
the accumulator cylinder wall during operation. If the piston is near the charging stem end, the
accumulator may need charging. If the piston is at the other end, the accumulator may have an
excess charge, or more likely an excessive amount of hydraulic fluid has collected in the
gas chamber.
Series 111 Accumulator: Check and Change Precharge
Pressure
This section covers checking and changing the precharge pressure for the 111 accumulator.

Equipment

An accumulator charging kit (MTS part number 376986-01).

Prerequisites

To prepare the accumulator for precharge check:
Warning:
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 stemcap, 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.
MTS Landmark™ Tabletop Load Units - Product Information
Maintenance
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