Joyce DSWJ3225 - Manual (Page 5)

5
Recommended repair parts for rebuild or spares. Refer to Section 3-1 Exploded view and
Section 3-2 Parts List.
A. (1) Thrust bearing – Item 4
B. (1) Wormgear – Item 5
C. (2) Worm shaft bearing and race – Item 6
D. (2) Worm shaft seal – Item 7 (2-ton and above)
E. (1) Shim kit – Assortment of item 8
F. (1) Worm - 12
G. (1) Lifting screw - 14
H. (1) Boot (if signs of wear are evident) – Item 24
I.
(1) Traveling Nut - 26
2-3 Disassembly of Stainless Steel Machine Screw Jacks
Use the appropriate disassembly procedure – if the lifting nut is outside the jack on the
screw, the jack is a Keyed for Traveling Nut (KFTN), also called a “rotating screw”,
otherwise the jack is a translating model. Handle machined parts with care, and maintain
an “order of disassembly” to aid in re-assembly. Remove all couplings, screw support
bearings, etc. before beginning disassembly.
Disassembly Procedure for KFTN (rotating screw) Models: see Figure 3-1
1. Remove the boot clamps (item 23) and collapse boots (item 24), if the jack is equipped
with boots. Remove the traveling nut (item 26) from the screw.
2. Loosen the (4) set screws (item 13) in the sleeve cap and remove the sleeve cap by
rotating counter-clockwise (CCW.)
3. The screw assembly can now be removed from the jack sleeve. The screw assembly
consists of the machine screw (item 14), the upper thrust bearing (item 4), the key
(item 27), retaining ring (item 28) and the wormgear (item 5). The upper thrust bearing
can be removed from the assembly. The wormgear can be pressed off the screw for
replacement if necessary. Note: On inverted KFTN models, it may be necessary to
remove the screw first.
4. Remove screws (item 10) from the bearing cap (item 3). Remove the bearing caps and
seals (item 7) carefully to avoid damaging seals. Make sure keys have been removed
first.
5. Carefully remove the shims (item 8) 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.
6. Remove the worm bearings (item 6). 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 12).
Disassembly Procedure for Translating Models: see Figure 3-1
1. Remove the boot clamps (item 23) and collapse the boot (item 24) if equipped. On
upright and inverted models, loosen the (4) set screws (item 13) and remove the sleeve
cap (item 2) by rotating CCW.
2. Remove the protection tube (item 11) and check to see if the lifting screw has travel
stops. This may require the use of a pipe wrench or strap wrench. If the jack has travel
stops on the screw, these will need to be removed before the lifting screw is removed
from the jack. If the jack does not have stops, the lifting screw can be removed by
simply unthreading it from the wormgear.
3. Remove the thrust bearings (item 4) and the wormgear (item 5) from the sleeve. The
bearing cones may be pressed onto the wormgear.
4. Keyed jacks have a keyway cut the length of the lifting screw (item 14). A steel sleeve
cap (item 2) has a key (item 321), which travels in the keyway and prevents rotation of