Delta 17-990X - Manual (Page 15)

15
ADJUSTING THE SPINDLE RETURN SPRING
The spindle will automatically return slowly to its upper position when the handle is released. The spindle return spring
was properly adjusted at the factory. However, to adjust, if necessary:
1. Loosen the nuts (B) and (E) Fig. 37, but do not remove. Make
sure that the spring housing (A) remains engaged with head
casting (C).
2. While firmly holding the spring housing (A) Fig. 37, pull out
the housing and rotate it (counter-clockwise to increase or
clockwise to decrease the spring tension) until the boss (D)
is engaged with the next notch on the housing. Tighten the
two nuts (B) Fig. 37 to hold the housing in place.
IMPORTANT: The inside nut (B) should not contact spring housing (A) when tightened.
DISCONNECT MACHINE FROM POWER SOURCE.
The sliding fit of the quill was adjusted at the factory. After a
long period of time, “play” between the quill and head
casting may develop. To re-adjust, loosen the nut (F) Fig. 36
and tighten the screw (E) Fig. 35 with the supplied hex
wrench. After adjustment, hold the screw (E) Fig. 36, and
tighten the nut (F) Fig. 36. Check the sliding fit by moving the
quill up and down several times to be sure the quill does not
bind.
Fig. 36
F
NOTE: Use drill bits with shank diameters of 1/2" or less.
NOTE: After installing a drill bit, use the supplied key to tighten all three locations on the chuck.
The use of accessories and attachments not recommended by Delta may result in risk of injury.
IMPORTANT: When the workpiece (B) Fig. 38 is long enough,
position it on the table with one end against the left side of the
column (C) to prevent the workpiece from rotating. If it is not
possible to support the workpiece against the column, clamp the
workpiece to the table.
MACHINE USE
Fig. 37
Fig. 38
D
A
C
B
E