14
| GTX Series Actuator Installation & Maintenance Instructions
Curtiss-Wright | Rev D | PN75557 | 10/01/2019
Grease renewal procedure (refer to Figure 12)
1. Remove the four bolts connecting the faceplate and any
mounting accessories from the front of the actuator.
2. Remove the roller screw by turning it counter clockwise
and threading it out of the cylinder. To remove the screw,
it may be necessary to hold the roller screw cylinder to
keep it from turning. Turning the shaft will help force the
faceplate assembly to break free of its housing.
3. Use a brush to work approximately 10 cm
3
(0.6 in
3
) of
grease into the roller screw assembly for every 100 mm
(3.9 in) of stroke length. Be sure all the threaded
surfaces of the screw assembly are covered. This can
be accomplished by applying grease to a few places on
the roller screw assembly and rotating the components
repeatedly in both directions to work the grease into the
assembly.
IMPORTANT
! Excess grease does not improve
lubrication and requires greater torque when the motor is
returned to operation.
4. With the actuator in the vertical position and the open end
of the roller screw cylinder facing up, position the roller
screw above the cylinder so that it is aligned axially with
the roller screw cylinder.
5. Slowly turn the roller screw clockwise in ¼- to ½-turn
increments while maintaining contact with the interior
threaded cylinder (ITC). This helps align the threads on the
roller screw with the threads in the ITC. Do NOT force the
roller screw into the cylinder.
If the roller screw does not turn freely, remove it and begin
again. When the screw is properly threaded into the cylinder,
it will roll freely into the actuator.
NOTE
: When the roller
screw reaches the portion of the cylinder that contains the
motor magnets, it will be more difficult to turn because of the
magnetic field of the magnets. THIS IS NORMAL. Continue
to thread the roller screw into the cylinder until it reaches
the bottom (it will become difficult to turn and the motor and
bearings will begin to rotate with it).
6. Place a small amount of seal lubricant on the inside
surface of the seal/bushing assembly.
7. Carefully slide the faceplate over the actuator rod end while
guiding the four cap screws through their respective holes
in the rear end cap of the actuator. Ensure the faceplate
seats completely and squarely on the front of the actuator.
NOTE
: The seal is a tight fit on the rod end. Use caution to
avoid damaging the seal on the threads of the extending
rod. The inner surface of the faceplate provides the pre-
loading for the bearings, so it is important that it be properly
seated. Torque the four cap screws of the faceplate
assembly to 12.2 Nm (9 ft-lb).
8. For actuators equipped with an external anti-rotate mecha-
nism and/or limit switch assembly, slide the rod of the
anti-rotate mechanism rod into the guide bushing. Tighten
the two screws used to hold the anti-rotate assembly or the
four screws used by the limit switch assembly to clamp that
assembly to the actuator rod.
Figure 12 –
Grease renewal reference
6.2 SEAL MAINTENANCE
Exlar recommends that the faceplate assembly containing the
main rod seal and bushing assembly be replaced during the
re-lubricating procedure. To have this service performed for you,
contact the Exlar Returns Department to send your unit in for
service (see Section 8.0, “Product Returns”). If any additional
maintenance or repair is needed, consult Exlar. It may be nec-
essary to return the actuator to the factory for refurbishment.
6.3 REPLACEMENT FACEPLATE ASSEMBLY KIT
Faceplate
Model
Part Number
Parts Included
GTX080
GTX100
PN 71457
PN 75536
Faceplate, O-ring, bushing,
seal, wiper, and fasteners
Figure 13 –
Faceplate Assembly Kit
GTX080: 6 mm Hex; 25 mm Long
Torque 12.2 Nm (9 ft-lbs)
GTX100: 8 mm Hex; 30 mm Long
Torque 23 Nm (17 ft-lbs)
Roller Screw
