Adjusting Spindle Return Spring - Porter-Cable 17-925 Instruction Manual

QUILL ADJUSTMENTS
The spindle is raised and lowered by turning the pilot
wheel (A) Fig. 31. The quill (B) can be locked at any
desired point in its travel by tightening the quill locking
lever (C). NOTE: The quill locking lever (C) is spring-
loaded and the handle can be repositioned by pulling
out on the handle (C) and repositioning the hub (D) of the
handle on the nut located underneath the hub.
The adjusting screw (E) Fig. 31, and nut (F) Fig. 32, have
been adjusted at the factory to give the quill (B) Fig. 31,
the proper sliding fit in the head casting. After a long
period of time, "play" between the quill and head casting
may develop and can be removed. The nut (F) Fig. 32, is
loosened and adjustment is made by tightening screw
(E) Fig. 31, with the hex wrench supplied. The nut (F) Fig.
32, is tightened to prevent the screw (E) Fig. 31, from
turning. Hold the screw (E) Fig. 31, with wrench when
nut (F) Fig. 32, is tightened and check by moving the
quill up and down several times to be sure the quill does
not bind.
ADJUSTING SPINDLE
RETURN SPRING
The spindle is automatically returned to its upper most
position upon release of the handle. It is recommended
that the handle be allowed to slowly return to the top
position after all holes have been drilled in the material.
This spring has been properly adjusted at the factory
and should not be disturbed unless absolutely
necessary. To adjust the return spring, proceed as
follows:
1. DISCONNECT MACHINE FROM POWER SOURCE.
2. Remove nut (B) Fig. 33. Loosen nut (E) approximately
1/4 turn, making sure spring housing (A) stays engaged with
head casting.
3. While FIRMLY HOLDING spring housing (A) Fig. 33
pull out housing and rotate it until boss (D) is engaged
with the next notch on the housing. Turn the housing
counterclockwise to increase or clockwise to decrease
spring tension. Then tighten nut (E) and then nut (B),
to hold the housing in place. IMPORTANT: Inside
nut (E) should not contact spring housing (A) when
tightened.
E
B
E
15
D
C
Fig. 31
F
Fig. 32
D
B
Fig. 33
A
A
C