Joyce HBIA51 - Ball Screw 1 diameter, 1.0" lead" - Manual (Page 6)

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2-4 Disassembly of Traveling Nut Actuator (TN)
1. Use the appropriate disassembly procedure. If the ball nut is outside the actuator on the screw,
it is a Traveling Nut Integrated Actuator (TN), this is also called a “rotating screw” actuator. If
the ball nut is not positioned outside the actuator sleeve, it is a Translating Tube Integrated
Actuator (TT).
2. Handle all machined parts with care and maintain an “order of disassembly” to aid in re-
assembly.
3. The motor is optional. It is not user serviceable.
4. Disconnect power from the Ball Screw Integrated Actuator before proceeding.
5. To remove the motor, secure the Ball Screw Integrated Actuator in a work holding device such
as a bench vise. Do not clamp onto the ball screw (11).
6. Remove the four Hex head screws and washers (22, 23). They attach the motor to the flanged
sleeve (1). Remove the motor.
7. Remove the coupling half (19) and key (20) from the worm shaft.
8. Remove the seal (9) and retaining ring (8).
9. Use a tool to tap on the flange end of the worm shaft (6). This will loosen and unseat the worm
shaft bearing (7) and permit disassembly.
10. Loosen the two set screws (5) and unthread the sleeve cap (4). The seal (17) and upper thrust
bearing (2) may remain inside the protection tube when it is removed.
11. Disassemble the ball screw (11) from the sleeve (1) by firmly pulling upward, away from the
sleeve (1).
12. The nut (3), key (13), and retaining ring (10) will be attached to the end of the assembly.
13. Remove the retaining ring (10) from the end of the ball screw (11).
14. Disassemble the nut and key (3, 13) from the ball screw. Be careful that the ball nut does not
come off the ball screw until you have a mandrel in place. Removing the ball nut without a
mandrel will result in ball bearings escaping from inside the ball nut assembly.
15. Unscrew the travelling nut assembly (12) from the ball screw (11) on to a mandrel, and
remove.
16. The lower thrust bearing (2) can now be pulled out of the sleeve.
2-5 Inspection of Components
1. Before any inspection, it will be necessary to completely clean all parts of the Integrated
Actuator. Use caution with any machined or fragile part.
2. Inspect the cleaned Integrated Actuator sleeve (1), ball screw (11), and Translating Tube
Assembly (11, 12, 13, 26, 28, 29, 30) or the rotating screw and nut (11, 12). Check for any
signs of stress or fracture, especially around mounting holes and clevis hole.
3. Inspect the condition of all the gears and components that have been disassembled.
4. Check the thrust bearings for any signs of brinelling, abrasive wear or spalling. Test for
smooth, quiet operation of bearings.
5. Replace seals on translating tube model (9, 15, and 21). Replace seals on the traveling nut
model (9, 17, and 21).
6. Inspect O-Ring (15 or 22) and keys (14, 24 or 13, 20) for signs of damage or deformity
7. Inspect lifting screw (11) for straightness and wear. On a translating tube actuator, this is part
of an assembly.
8. Inspect the clevis end of the translating tube for damage or deformity.
9. Inspect the Traveling Nut (12). Replace it if wear is evident.
2-6 Assembly of Translating Tube Actuator (TT)
1. Rest the actuator sleeve (1) on a work surface with the flange downward.
2. Install the worm shaft bearing (7) in the sleeve (1) passing it through the wide opening at the
side of the sleeve. Position it over the worm shaft opening. Seat the bearing with a tool.