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Always make sure your power
tool is unplugged when conducting
maintenance procedures!
Replacement of
Worn Shafts and Sheaths
Shafts and sheaths last longer when they are not
used at sharp angles or loops, since wear occurs at
the points of greatest friction. There is no way to
avoid ultimate wear, and under normal conditions a
flexible shaft machine may require several replace-
ment shafts and sheaths during its lifetime.
To expose the inner shaft follow steps 1, 2, and 3
on the previous page.
Next, remove motor
connector with 1"
open end or adjust-
able wrench. Motor
connector has a left
hand thread and
must be turned
clockwise (right) for removal.
Loosen set screw on the flexible shaft motor
coupling and slide shaft off the motor shaft.
Installation of New Shaft
1. After removing old shaft, loosen set screw on
the new flexible shaft motor coupling and slide
coupling onto motor shaft.
2. Tighten set
set screw
screw securely
onto the flat of the
motor shaft.
3. Grease shaft prior
to putting on the
sheath. (See lubrica-
tion instructions on
page 13.)
4. Slide motor
connector back up
over the shaft and
tighten to the left
(counterclockwise).
5. Slide sheath over flexible shaft with plain
fitting directed toward the motor and into the
motor connector. (Each end of the sheath has a
metal fitting. One is plain, the other has a groove
around it to fit the handpiece.)
6. Adjust the shaft (page 5 and top right) and
tighten sheath set screw in motor connector.
14
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Shaft and Sheath Adjustment
Place the entire unit on a flat surface with
shaft and sheath extended straight.
Adjust the exposed tip of the flexible shaft
at the handpiece end so that it extends 3/4"
(19mm) beyond the sheath.
This is done by moving the sheath in or out
of the motor connector. When the correct
adjustment is made, tighten the screw in
the motor connector.
Replacement of Motor Brushes
Motor brushes should be checked for wear
periodically. When new they are approximately
3/4" (19mm) long. Replace them when they
have worn to 1/4" (6mm). To remove brushes,
disconnect motor power cord and unscrew the
motor
motor
brush caps. Remove the worn motor brushes,
shaft
coupling
replace with new motor brushes, and screw
motor brush caps back on. Be sure to replace
both motor brushes even if one of them is less
worn than the other.
New
Motor
Brush
www.foredom.net
IMPORTANT!
Motor Brush
that needs
replacement
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