WTR Series
Maintenance
L120 Installation & Maintenance Manual 120-11000 A
During an inspection consider the following:
• Quantity – Ensure there is enough lubricant so that the Worm and the Worm Gear are
totally immersed in grease regardless of the position.
• 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 such as Exxon Varsol
#18. This degreaser/cleaner 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. Thinners such as Amoco WAYTAC #31 oil may be added provided
the volume of thinner does not exceed 20% of the total lubricant.
Factory Lubricant
Gear Case:The L120 series actuator gear case is factory-lubricated with Exxon Nebula EP-0
calcium complex base grease, suitable for temperatures from -20°F (-29°C) to +150°F
(+79°C).
Exxon Nebula EP-00 calcium complex base grease, suitable for temperatures from -60°F
(-51°C)to +250°F (+121°C) is available as an option upon customer request.
Geared Limit Switch: Mobil 28 (No Substitute) – Table 4 specifies approximate lubricant
weights.
Table 4 – Lubricant Weights
Unit Size Lbs. Kg
L120-10 3.3 1.5
L120-20 6.1 2.8
L120-40 8.1 3.7
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.
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
+150°F (+66°C).
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