Duff-Norton Machine Screw Rotating 500lb - 1 Ton - Manual (Page 8)

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Figure 2-1. Expansion Plug Replacement
other worm bearing on end of worm shaft, insert
other worm shaft end through worm housing, tap
lightly to position worm and both bearings and snap
in second retainer ring.
9. Install screw (5) and gear (6) assembly into shell (3).
10. For 1-ton models-install bearing (7) cup into shell
cap (2). For 1/4-ton and 1/2-ton models - place top
load bearing (7) on hub of gear (6).
11. Fill housing (3) with grease.
12. Install shell cap (2) and screw down until tight.
Note
Shell cap flange does not necessarily have to bear
against top of shell. There will usually be a gap. This
will put a slight drag on the worm. If worm is hard to
turn, back off slightly on shell cap.
13. Install set screws (1) in shell cap(2). Tap shell cap
sharply with hammer and re-tighten set screws
Note
If new parts have been installed it may be necessary
to spot holes for set screws.
14. Brush screw (5) with light film of grease and thread
lifting nut (23) on screw (5). The face of lifting nut
flange should be toward shell (3).
15. Operate unit to insure proper functioning of all compo-
nents prior to installation and use.
Assembly is now complete.