Joyce LA155P (120 VAC) - Manual (Page 7)

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M. (1) Limit switch gasket and cover (62,63)
N. (1) Translating Tube assembly (28,29,30,31,32,33,34,35, and 36)
2-3 Disassembly of a Linear Actuator
Motor Disassembly
1. The motor included with the Linear Actuator is not user-serviceable.
2. Disconnect power from the Actuator before proceeding.
3. To remove the motor, secure the Linear Actuator in a work holding device such as a bench
vise. Do not clamp on the outer tube (34) or the upper housing (2).
4. Remove the screws, cover and gasket (47, 46, 45) and carefully disconnect and remove the
capacitor (43). Exercise caution when handling the capacitor. Touching the terminals can
result in electrical shock. Follow the advice of an electrician when discharging the stored
charge of the capacitor.
5. Remove the screws, cover and gasket (47, 63, and 62) to open the limit switch cavity.
6. Remove the (5) screws and washers (40, 41) from the upper housing (2).
7. Set these aside and carefully remove the upper housing. (It may require effort to pull the upper
and lower housings apart.)
8. Remove the (3) screws and lock washers (5, 6) that attach the motor to the lower housing (1).
9. Feed the motor lead wires through the housing and disconnect the motor lead wires from the
limit switch.
10. Remove the motor (3).
11. Replace any worn or damaged parts upon re-assembly.
2-4 Assembly of Linear Actuator
Limit Switch Assembly
1. When assembling these parts, take care not to damage the small limit switches by bending the
metal plungers or by overextending them.
2. Using a flat bit screwdriver and two screws (47), attach the limit switch assembly (51, 52, and
53) snugly to the back of the limit switch cavity.
3. Assemble the shaft (55) to the limit potentiometer worm (57) by pressing together. The
threaded end of the potentiometer worm should be oriented toward the threads on the shaft.
4. Thread the two limit switch nut cams (56) onto the shaft (55). It may be best to rotate them
toward the center of the shaft to protect the switches from being bent or overextended
5. Check that the slot in the end of the screw is aligned vertically to the switches. If it is not so
aligned, rotate through the motor using a screwdriver in the motor slot until the alignment is
correct.
6. Insert the compression spring (66) into the cavity recess at the slotted end of the lifting screw.
7. Insert the flat end of the shaft assembly (55, 56, 57) into the slot on top of the compression
spring (66) and rounded end into the bronze bearing (58) on the opposite side of the cavity.
8. Insert the nut retainer (59) into the grooves on the edges of the limit switch cavity. If this unit
includes a potentiometer (60), it will be attached to the retainer nut (59). The potentiometer is
optional and your unit may not have one.
9. The small pinion on the potentiometer will mesh with the potentiometer worm (57).
Caution: it is possible to damage the potentiometer by “jamming” it beyond the
intended number of pinion rotations in a single direction. Follow the procedure for
setting the limit switches before operating the linear actuator. Refer to Section 1-7 and
Section 1-8.
10. Cover the limit switch cavity using the four screws (47) and the gasket and switch cover (62,
63).