Joyce Machine Screw Jacks User Manual
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2-6 100 and 150-Ton Jacks
1. The assembly of the 100 and 150-ton jack varies from the smaller machine screw jacks.
The 100 and 150-ton jacks utilize a base plate and a sleeve that are shimmed and bolted
together, instead of a sleeve and sleeve cap.
2. In a translating jack, the screw (item 14) should be removed first, and then the sleeve
can be unbolted from the base.
3. In a KFTN model, the base and sleeve may be unbolted first.
4. In assembly, the pre-load for the worm shaft (item 12) is set the same as the rest of the
jacks. The pre-load for the thrust bearings (item 4) is set with the shims between the
base plate and the sleeve. Similar to the smaller machine screw jacks, this is a trial and
error process to obtain the correct pre-load. (See Section 2.5 – Assembly of Machine
Screw Jacks).