Joyce RWB3250 - Manual (Page 6)

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8. Carefully remove the shims (item 4,5,6) from the jack sleeve or bearing 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. Note: the one-ton jack does not have shims.
9. Remove the worm bearings (item 3). The cup may be press-fit. Use a dead-blow, plastic or
other non-marring mallet to remove the worm (item 10).
Disassembly Procedure for Translating Models: Section 3-3 & 3-4
1. Remove the boot clamps (item 22, 24) and remove the boot (item 23) if equipped. On both
upright and inverted translating models, loosen the (4) set screws (item 19) and loosen the
sleeve cap (item 14) by rotating CCW. T2 (loadpad) and T4 (male clevis) end conditions
require the ball nut to be removed from the ball screw as the sleeve cap will be captured
between the end condition and the ball nut. If this must be done, see Section 2.6 – Ball nut
disassembly and rebuild. The inverted model has the protection tube (item 21a) attached
to the sleeve cap. The protection tube may be un-threaded from the sleeve cap if
necessary. NOTE: a strap wrench or similar tool may be used on the sleeve cap to aid in
removal.
2. On upright translating models, the ball screw assembly is removed through the top of the
sleeve. The assembly consists of the ball nut (item 16), the thrust bearings (item 11,12)
and the wormgear (item 13). The wormgear may be un-screwed from the ball nut (removal
will require heating the thread adhesive to 500° Fa hrenheit ) after the set screw (item 20)
has been loosened, but it is not recommended that the ball nut (item 16) be removed from
the ball screw unless it is being replaced. For ball nut removal, see Section 2.6 – Ball nut
disassembly and rebuild. 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.
3. 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 17), ball nut (item 16), wormgear (item 13) and thrust bearings (item
11,12). The wormgear is attached to the ball nut with set screws and a thread-adhesive.
Removal will require heating the thread adhesive to 500° Fahrenheit.
4. On inverted translating jacks, the ball screw is removed through the bottom of the jack for
a T2 (loadpad) or T4 (male-clevis) end condition. The ball screw retainer screw (item 26)
and ball screw retainer (item 25) must be removed from the ball screw (item 17). Loosen
the set screw (item 20) in the ball nut (item 16) and unscrew the ball nut from the wormgear
(item 13.) Removal will require heating the thread adhesive to 500° Fahrenheit, then
remove the ball nut (item 16) 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 11,12) and wormgear (item 13) from the sleeve.
5. Translating jacks have either a protection tube (item 21 – upright) or a bushing (item 15 –
inverted) in the bottom of the jack sleeve. These are threaded into the sleeve and may be
removed if required.
6. Remove (6) screws, 3 per side (item 8) from the bearing caps (item 7). Remove the shaft,
bearing caps and seals (item 9) carefully to avoid damaging seals. Make sure keys have
been removed first. Note: the one-ton jack has retaining clips.
7. Carefully remove the shims (item 4,5,6) from the jack sleeve or bearing cap. NOTE: there
will not necessarily be an equal quantity of shims per side. Keep track of the number and
order of shims on each side of the jack. The one-ton jack does not have shims
8. Remove the worm shaft bearings (item 3). The cup may be press-fit and require the use of
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.