MTS Landmark Tabletop - Manual (Page 95)

Description Item
273 + (current temperature) 3
273 + (original temperature) 4
Degrees Fahrenheit 5
current pressure = original pressure x 6
460 + (current temperature) 7
460 + (original temperature) 8
• If a pressure line accumulator has a pressure level change of ±1.4 MPa (200 psi) between checks, the
accumulator requires maintenance or the time interval between checks needs to be shortened.
• If a return line accumulator has a change of ±50% of the original pressure level between checks, the
accumulator requires maintenance or the time interval between checks needs to be shortened.
• If the precharge pressure level increases at each check interval, this indicates that fluid is collecting on
the gas side (a small amount of fluid leakage is normal). When the precharge pressure level cannot be
maintained within the limits, remove the fluid and charge the accumulator. If the levels are again exceeded
at the first check interval, replace the piston seals after the initial fluid has been changed.
• If the precharge pressure level decreases at each check interval, this indicates gas leakage to the fluid
side. When the precharge pressure level cannot be maintained within the limits stated in the previous
guidelines, replace the accumulator piston seals.
• During normal operation, the accumulator piston should be near the center of the accumulator 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:
MTS Landmark™ Tabletop Load Units Product Information 95
Maintenance