LATHE OPERATIONS - OD1645 - LESSON 1/TASK 2
(h) Replacing the Oil Seals.
1 The openings in the bearing retainers through which the spindle
pass are closed with the molded plastic seals.
If it is necessary to
replace one, only that bearing retainer containing the sea] should be
removed.
2 The seals are pressed into the retainers by hand and can easily
be lifted out or installed.
Care should be exercised when returning the
retainer to its original position so the seal edges are not damaged.
(i) Replacing the Gear or Main Spindle Bearings.
Due to the close
precision fits maintained, it is recommended that the main housing assembly
be removed and returned to the factory when replacements in the assembly are
needed.
Replacements, however, can be manufactured where precision
equipment is available.
(j) Removing Main Housing from the Frame.
To remove the main housing
from the frame, remove the four button head cap screws. Then turn the lead
screw to the right and move the Main Housing to its lowest position.
Continue turning the lead screw until the cap is raised free of the guide
posts. The housing may then be lifted off from the posts.
(k) Universal Head Main Spindle Adjustment.
1 Both bearing retainers position the driven gear at its correct
mounting distance, and maintains the preload on the main spindle bearings.
The rear retainer should not be removed unless the gear needs re-
positioning.
2 If the gear needs re-positioning, return the head, if at all
practicable, to the factory for correction.
If unable to return it,
exercise care to insure that the forward, or inner tips of the teeth are the
proper distance from the center line of the driving gear. This dimension is
.8065/.8060 inch. The front retainer may be turned to increase or decrease
the preload.
(1) Universal Head Gear Adjustment.
1 The backlash of the universal head gears should be between .002
and .004 inches.
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