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Screw Jacks Assembly
1. Insure 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 screw jacks is reverse of the disassembly procedure. Make sure all bearings and seals seat properly. The bearing cover screws and housing cover should only be hand tightened, initially. Some screw jacks may require the wormgear and thrust bearing / tapered roller bearing be installed first, as they will not pass the worm, if already installed.
3. Tighten bearing cover 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 recheck 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 screw jacks is re-assembled, the thrust bearing / tapered roller bearing pre-load needs to be set. Check by rotating the input shaft, while tightening the housing cover. Continue to check the rotation of the input shaft as housing cover is tightened. Use a dead-blow hammer on top of housing cover to help it seat. Tighten housing cover until it will not tighten further by hand.
Screw Jacks Assembly
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