Joyce MWJ2410 - Manual (Page 5)

5
2-2 Repair Parts
Obtain repair parts by calling Joyce Dayton Customer Service at (800) 523-5204, (937) 294-
6261, (937) 297-9391 (facsimile) or call your local representative. When ordering repair
parts, please supply the serial number (located on the jack nameplate).
For recommended repair parts for rebuild or spares, refer to Section 3-1, Exploded View,
and Section 3-2, Parts List.
A. (2) Thrust bearing – Item # 4
B. (1) Wormgear – Item #5
C. (2) Worm shaft bearing – Item # 6
D. (2) Worm shaft seal – Item # 7 (2.5 kN and above)
E. (1) Shim kit – Assortment of item # 8
F. (1) Worm – Item #12
G. (1) Lifting screw – Item #14
H. (1) Boot (optional, if signs of wear are evident) – Item # 34
I.
(1) Traveling Nut – Item #37 (KFTN model only)
2-3 Disassembly of Metric Screw Jacks
Use the appropriate disassembly procedure – if the lifting nut is outside the jack on the
screw, the jack is 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 #33) and collapse boots (item # 34) if the jack is
equipped with boots. Remove the traveling nut (item # 37) 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 # 38) 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. Note: the MWJ51 jacks have retaining clips (item # 20) instead of
bearing caps.
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. The MWJ51 and MWJ201 jacks do not
have shims.
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 # 33) and collapse the boot (item # 34) 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. Removing the protection tube 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