Rockwell 70-602, Technical Manual

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CHANGING SPEEDS
When changing speeds on your drilling machine, pro-
ceed as follows:
1 . D I S C O N N E C T M A C H I N E F R O M P O W E R
S O U R C E .
2. Loosen wing nut located on the opposite end of the
plate (A) Fig. 3. (This wing nut is shown at (D) Fig.
6 ) . T h e m o t o r a n d m o t o r p l a t e c a n t h e n b e t i l t e d
forward, as shown in Fig. 3, releasing the belt tension.
3. Open the door (B) Fig. 3, tilt the motor pulley (C)
forward, and move the belt to the desired steps on the
motor and spindle pulleys, as shown in Fig. 3.
4. After the belt is positioned on the pulleys, close
the door (B) Fig. 3, and tighten the wing nut located
Fig 3 - Changing Speeds
on the opposite end of the plate (A) to keep the motor
pulley, motor and motor plate in the vertical position.
CHANGING SPINDLES
To change the spindle for any reason, proceed as fol-
lows:
1 . Remove the two nuts and washer (A) Fig. 4.
2. Carefully pull out the return spring and housing
(B) Fig. 4 about 1/4” until roll pin (C) disengages
with the groove in the return spring housing and care-
fully rotate the return spring housing to release ten-
sion on the return spring or refer to the instructions
o n p a g e 7 u n d e r A D J U S T I N G S P I N D L E R E T U R N
SPRING to release spring tension.
3. Disengage the return spring from the screw (D)
Fig. 6, in the pinion shaft, and remove the return
spring and housing from the pinion shaft.
4. Loosen screw (E) Fig. 4 and move retainer (F) up
out of the groove (G) in the pinion shaft.
5. Remove screw (D) Fig. 4, from pinion shaft and
while holding the quill with your left hand, remove
the pinion shaft (H) by pulling it straight out. The
quill assembly can then be easily removed from the
head casting.
Fig 4 - Removing Spindles
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