LMAIM1501 LY Installation and Maintenance for LY 1001, LY 2001 and LY 3001 7-1
7 Maintenance
7.1 Lubrication
No seal can remain absolutely tight at all times. Therefore, it is not unusual to find a very small amount of weeping
around shaft seals—especially during long periods of idleness such as storage. Using grease minimizes this
condition as much as possible. If a small amount is weeping at startup, remove it with a clean cloth. Once the
equipment is operating on a regular basis, the weeping should stop.
7.1.1 Lubrication Inspection
Inspect Limitorque LY series actuators for correct lubrication prior to operating—particularly following a long
storage period.
Each application has its own effect on the actuator and the frequency of these inspections should be based on the
application and the operating experience. The following lubrication inspection schedule is recommended until
operating experience indicates otherwise.
For Gear Case, inspect lubrication every 18 months or 500 cycles, whichever occurs first.
During an inspection, consider the following:
• Quantity – LY operators are built to operate on the immersion principle. Ensure there is enough lubricant so
that the Worm is 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.
7.1.2 Factory Lubricant
The LY actuator gear case is factory-lubricated with an NLGI Grade 0 or 00 lithium-base grease suitable for
temperatures from -20°F (-29°C) to 150°F (66°C). For temperatures above or below this range, consult the factory.
7.2 Minimum Lubricant Qualities Required
The standard lubricants used by Flowserve have been proven to be extremely reliable over years of service.
Flowserve does not recommend a particular lubricant substitute for the standard lubricants; however, Flowserve
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 prop-
erties to be ineffective.
Flow Control Division
Limitorque Actuation Systems
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