Joyce DCD242 - Manual (Page 7)

7
5. Inspect the keyway on the worm (item # 10) and roll the worm on a flat surface to look
for wobble in the shaft. Threads on the worm should not show an excessive buildup of
bronze gear material.
6. Replace all seals when a complete disassembly is done.
7. Inspect Aluminum-Bronze wormgear (item # 3) for signs of excessive wear.
8. Check boots (item # 34) for wear or cracks
9. Inspect lifting screw (item # 7) for straightness.
2-5 Assembly of ComDRIVEs®
1. Ensure that all bearings are packed with grease. Coat seals with light oil and put
masking tape on keyways and other sharp surfaces to avoid seal damage.
2. Assembly of jack is reverse of the disassembly procedure. Make sure all bearings and
seals seat properly. The bearing cap screws and sleeve cap should only be hand
tightened initially. Some jacks may require the wormgear and thrust bearing be
installed first, as they will not pass the worm, if already installed.
3. Tighten bearing cap bolts. Check the input shaft for excessive axial or lateral
movement. If the input shaft feels loose remove shims, if it feels tight, add shims. Give
the input shaft a solid blow on each end (in axial direction) with a soft mallet and re-
check the feel. If it feels OK, continue to next step, otherwise continue adjusting the
shims. This is a trial and error operation. The correct set-up has a solid feel without
play (axial or lateral) and the input shaft rotates with an even, smooth but snug feel.
4. When jack is re-assembled, the thrust bearing pre-load needs to be set. Check by
rotating the input shaft, while tightening the sleeve cap. Continue to check the rotation
of the input shaft as sleeve cap is tightened. Use a dead-blow hammer on top of sleeve
cap to help it seat. Tighten sleeve cap until it will not tighten further by hand.