TM 5-3810-231-12
to a bevel gear which is meshed with the
intermediate swing shaft bevel gear.
When electrical power is applied to one of
the outer (driving) members, the inner
(driven) member is caused to turn by
magnetic force generated in the outer
member. There is no direct physical
contact between these inner and outer
members. The driven member always
rotates in the same direction to one or the
other of the magnetic clutch units, the
intermediate swing shaft is rotated either
clockwise or counterclockwise. This will
cause the machine to swing in either
direction depending on direction selected.
(2) The wiring diagram for the complete
magnetic clutch system is shown in figure
units which make up the system are not
necessarily
shown
in
the
same
relationship that they are found on the
machines.
Figure 65. Magnetic clutch jack shaft assembly.
b. Brush Replacement and Adjustment.
(1) The brushes (fig. 67) which contact the
of the brush holder. This insures that the
magnetic clutch sliprings should be
brush pressure spring is applying pressure
checked occasionally to be certain that
against the brush and not against the
they are free in the brushholders. If the
brush holder.
brushes do not move freely, there will be
(2) The pressure springs (fig. 67) which
poor electrical contact between the
hold the brush against the sliprings are
brushes and the magnetic clutch sliprings
adjustable. Set for approximately 1-1/4 to
and the sliprings may be worn
1-1/2 pounds, as measured with a spring
excessively. Replace the brushes when
scale.
they are worn so that the top of the brush
is approximately even with the top
c. Cleaning Sliprings. If sliprings become badly
discolored clean by holding 00 sandpaper against the
slipring.
95
