Curtiss-Wright | GSM Series Rev. U PN29959 3/28/17
18
Grease Renewal
The bearings located in the front of the actuator, the roller screw
cylinder, and the roller screw assemblies are the components that
require grease. They require a coating of grease. They do not need to be
packed with grease. Excess grease requires more torque from the motor
when returned to operation, and does not improve the lubrication of
the unit.
1.) Use a brush to work approximately 0.5 in
3
of grease for every
3 inches of stroke length into the roller screw cylinder. Be sure to
cover all of the threaded areas of the cylinder.
2.) Use a brush to work grease in to the roller screw assembly. Be
sure to cover all the threaded surfaces of the screw assembly.
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.
3.) Force grease into the front of the thrust bearing assembly. Make
a concerted effort to insure that the grease is well worked in.
Grease must reach the bearing just behind the bearing that is
visible as well. Use the following amounts of grease for each size
roller screw and bearing:
GSM20:
0.5 in
3
GSM30:
0.75 in
3
GSM40:
1.00 in
3
4.3 Reassembly
1.) Rethread the roller screw into the internally threaded cylinder
(ITC). It is a multiple start screw, and this is not always easy. DO
NOT FORCE THE ROLLER SCREW INTO THE CYLINDER. It
is best to have the actuator vertical with 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 ITC. Slowly turn
the roller screw 1/4 to 1/2 a turn counterclockwise with it in
contact with the ITC. This will help to align the threads on the
roller screw with the threads in the ITC. Rotate the roller screw
clockwise and it should begin to thread into the cylinder. If it does
not turn freely, remove it and begin again. When threading the
screw into the cylinder, it will roll freely into the actuator. When it
reaches the portion of the cylinder that contains the motor
magnets, the roller screw 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. When it reaches the
bottom, it will become difficult to turn and the motor and bearings
will begin to rotate with it. The roller screw is now fully inserted
into the cylinder.
Содержание GSM20
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