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Limitorque Actuation Systems L120 Series FCD LMENIM1201-04-A4 – 03/18
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• Quality – Inspect lubricant for dirt, water or other foreign matter. If any one of these is found:
1. Flush the actuator with a commercial degreaser/cleaner that is not corrosive and does not affect
the seal materials.
2. Repack the actuator with fresh lubricant allowing room for grease thermal expansion.
• Consistency – Ensure the lubricant is fluid approximating a standard NLGI-0 grade consistency or
less.
6.1.2 Factory Lubricant
Gear Case: The L120 series actuator gear case is factory-lubricated with an EP-0 lithium grease, suitable
for temperatures from -20°F (-29°C) to +250°F (+121°C).
Table 6.1 – Specified Approximate Lubricant Weights
Actuator Size lb. kg
L120-10 2.75 1.3
L120-20 4.25 1.9
L120-40 5.75 2.6
Geared Limit Switch: Permanently lubricated with Beacon 325. Limitorque does not recommend disas-
sembly of the gearbox.
6.2 Minimum Lubricant Qualities Required
The standard lubricants used by Limitorque have been proven to be extremely reliable over years of
service. Limitorque does not recommend a particular lubricant substitute for the standard lubricants;
however, Limitorque does require the following lubricant qualities as a minimum.
a CAUTION: Do not mix lubricants of a different base chemical. Mixing lubricant bases may cause
lubricant properties to be ineffective.
The Lubricant must:
• contain an “EP” additive.
• be suitable for the temperature range intended.
• be water and heat-resistant and non-separating.
• not create more than 8% swell in Buna N or Viton.
• not contain any grit, abrasive, or fillers.
• comply with a slump-prefer NLGI-0 grade.
• not be corrosive to steel gears, ball, or roller bearings.
• have a dropping point above 316°F (158°C) for temperature ranges of -20°F (-29°C) to +250°F
(+121°C).
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