Joyce CDB3230 - Manual (Page 7)

7
Disassembly Procedure for Translating and Keyed Models: Section 3-1 & 3-2
1. If the ball screw ComDRIVE is quipped with a boot, remove the boot clamps, collapse
and remove the boot.
2. On both upright and inverted translating models, loosen the four set screws (item 4)
and loosen the sleeve cap (item 5) by rotating CCW. The ball nut must be removed on
T2 (load pad) and T4 (male clevis) end conditions, otherwise, the sleeve cap will be
captured between the end condition and the ball nut. For these instructions see
Section 2.6 – Ball Nut Disassembly and Rebuild. The inverted model has the protection
tube (item 28) attached to the sleeve cap. Use a strap wrench or similar tool to
unthread the protection tube from the sleeve cap.
3. On upright translating models, the ball screw assembly is removed through the top of
the sleeve. The assembly consists of the ball nut (not shown), thrust bearings (item 2)
and wormgear (item 3).
4. On inverted translating jacks, the ball screw assembly is removed through the top of
the jack for a T1 (plain) or T3 (threaded) end condition. The ball screw assembly
consists of the ball screw (item 7), ball nut (not shown), thrust bearings (item 2) and
wormgear (item 3).
5. NOTE: The wormgear may be unscrewed from the ball nut, but removal will require
heating the thread adhesive to 500° Fahrenheit. If this is necessary, first remove the set
screw. It is not recommended that the ball nut be removed from the ball screw unless it
is being replaced. For ball nut removal, see Section 2.6 – Ball Nut Disassembly and
Rebuild.
6. On inverted translating jacks, the ball screw is removed through the bottom of the jack
for T2 (load pad) or T4 (male-clevis) end condition. Loosen the set screw in the ball nut
(not shown) and unscrew the ball nut from the wormgear (item 3.) Removal will require
heating the thread adhesive to 500° Fahrenheit, the n remove the ball nut from the ball
screw; see Section 2.6 – Ball Nut Disassembly and Rebuild. Remove the ball screw
from the bottom of the sleeve and the thrust bearings (item 2) and wormgear (item 3)
from the top of the sleeve.
7. NOTE: the bearing races may remain pressed into the sleeve cap (upper bearing race)
and the sleeve (lower bearing race). These should not be removed unless they are
being replaced. Always replace bearings in sets.
8. Upright translating and have a protection tube (item 28) in the bottom of the jack
sleeve. It is threaded into the sleeve and may be removed if required. Inverted jacks
have a protection tube in the sleeve cap and they also include a bushing.
9. Remove three screws (item 16) from the bearing cap (item 13) on one side and three
screws (item 19) from the adapter cap (item 14) on the other side. Remove the caps
and seals (item 15) carefully to avoid damaging seals. Make sure worm shaft keys
(item 21) have been removed first
10. Carefully remove the shims (item 12) from the jack sleeve, bearing cap, or adapter cap.
NOTE: there will not necessarily be an equal quantity of shims per side. Keep track of
the number of shims on each side of the jack.
11. Remove the worm shaft bearings (item 11). The cup may be press-fit. Use a dead-blow,
plastic or other non-marring mallet to remove the worm (item 10).
2-4 Inspection of Components
1. Before any inspection, it will be necessary to clean all parts of the jack thoroughly.
Use caution with any machined or fragile part.
2. Inspect the cleaned sleeve (item 1) and sleeve cap (item 4) for any signs of stress or
facture, especially around the mounting bolt locations.
3. Inspect the worm (item 10) and thrust bearings (item 2) for any signs of Brinelling,
abrasive wear or spalling. Test for smooth, quiet operation of bearings.
4. Inspect bearing cap and adapter cap (items 13 & 14) for any signs of stress.