MUELLER
®
C1-36 Drilling Machines
Operating Instructions
6
7
3. Remove the cotter pin from the
feed screw nut which is located in
the center of the crank hub at the
rear of the machine
4. Back off the feed screw nut 3
revolutions only. DO NOT remove
the feed screw nut.
5. Rotate the feed crank in the
clockwise direction until you feel the
screw re-engage the feed nut.
6. If the feed screw does not
re-engage the feed nut: GENTLy
tap on the feed screw nut with a soft
mallet and repeat Step above (5)
and this Step (6) until it does.
7. Continue to turn the feed crank
in the clockwise direction for 18 full
revolutions. This will ensure full re-
engagement between the fed screw
and feed nut. Retighten the feed
screw nut and replace the cotter pin.
8. Resume normal operations.
Re-engaging overtravel Feature
To re-engage the boring bar after it
has overtraveled while making a cut
on a pipe that is under pressure:
1. Turn off the drive unit
2. Disengage the automatic feed by
pulling out on the automatic feed
knob.
3. Rotate the feed crank in the
clockwise direction until the pickup
of the feed nut in felt.
4. Continue to turn the feed crank
in the clockwise direction for 18
full revolutions. This will ensure ful
re-engagement between the feed
screw and feed nut.
5. Resume normal operation.
To re-engage the boring bar after it
has overtraveled while making a cut
on a pipe that is not under pressure,
or if the feed screw will not engage
the feed nut when the feed crank is
turned in the clockwise direction:
1. Turn off the drive unit.
2. Disengage the automatic feed by
pulling out on the automatic feed
knob.
Overtravel Feature
