6 |Dresser Natural Gas Solutions
6.1 Acceptable Lubricants
Standard lubricants and acceptable substitutions for
use in the actuator in Table 3.
Recommended
Manufacturer
AeroShell Grease 6
Shell Oil Products
Substitute
Manufacturer
Lubriplate MAG-1
Fiske
Mobilgrease 28
Mobil
Litholene HEP1
ARCO
Mobilux EP1
Mobil
Gulfcrown EP1
Gulf
7.0 Troubleshooting Guide
In the event of a problem with your Andco actuator, make
the following preliminary checks before calling the factory for
assistance.
1. The actuator’s rod will not extend or retract.
a. Check for a blown fuse or circuit breaker in the wiring.
b. Check for loose wiring.
c. Check if the motor has overheated and activated the
thermal switch.
d. Check that the limit switches are set correctly.
e. Check the binding in the load being actuated.
f. Check if a capacitor lead is open.
g. Check if the drive nut is damaged or worn, by
disconnecting the actuator from the load and pulling
or pushing on the extension rod.
8.0 Optional Equipment
8.1 Gear Driven Potentiometer
This optional assembly is directly driven by the operation of
the actuator and gives the capability of providing a continuous,
linear output signal directly proportional to the actuator’s stroke.
The signal can be interfaced with automatic control equipment
to position or sense the actuator at any desired stroke between
fully extended and fully retracted. The potentiometer assembly
is mounted directly to and driven by the geared position limit
switch assembly. Characteristics of the potentiometer are 1000
ohm total resistance ±2.0% linearity, 1 watt at 40°C power
rating. Input gearing to the potentiometer is factory selected
to accommodate the full range of the actuator’s strokes and
the acme screw pitches. The potentiometer has been factory
adjusted so the 0 and 1000 ohm resistance points correspond,
respectively, to the fully extended and fully retracted rod
positions. Field adjustments may be made by loosening the jam
nut holding the potentiometer (64) to the mounting bracket
(65). Rotate potentiometer to the desired position and tighten
the jam nut. Potentiometer only to be connected to a class II
power source.
For units that utilize the last portion of the actuator stroke only;
the potentiometer gearing must be disconnected if the unit is to
be retracted beyond the “zero” point.
Table 3 - Standard and Substitute Lubricants
Stroke
(Inches)
Actuator Lubricant Amount
(Body Tube)
(Pounds)
6
.22
12
.36
18
.51
24
.66
30
.81
36
.96
Table 2 - Actuator lubricant amount per stroke length
6.0 Lubrication Instructions
Every Eagle linear actuator has been lubricated for life at the
factory and should not require further lubrication if operated
at published duty cycle, rated thrust and in appropriate
environmental conditions. However, if the unit is disassembled,
it should be cleaned and lubricated as given in step 4 of Section
6.0. The amount of lubricant in each actuator depends on the
stroke of the actuator as shown in Table 2.
2. The actuator only actuates in one direction.
a. Check that all wiring connections are secure.
b. Check that the position limit switches are
set correctly.
c. Check for an excessive external load on the
actuator in one direction.
3. The actuator is excessively noisy.
a. Check for a damaged bearing.
b. Check for a damaged gear (chipped tooth,
missing teeth, etc.)
c. Check for a damaged screw.
4. Actuator exhibits high motor current.
a. Check for low line voltage.
b. Check for external binding related to the load
being actuated.
c. Check for excessive external load being actuated.
d. Check for loss of lubricant.
e. Check the extension rod for excessive contaminates.
If you still have a specific problem with your Andco Eagle
Actuator after making all of the above checks, contact Dresser
NGS for further assistance.
