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'STO O P RET
'ST
P RET A A IN
INER
ER
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SNAP RING
SNAP RING
SPAC
SPACER
ER WASHER
WASHER
Fig. &Removing or Installing Shifter Fork
Fig. &Removing or Installing Shifter Fork
will wash lubrication from clutch.
will wash lubrication from clutch.
(3) The drive unit may be cleaned with brush moist-
(3) The drive unit may be cleaned with brush moist-
ened with cleaning solvent 'and wiped dry with cloth.
ened with cleaning solvent 'and wiped dry with cloth.
7 7 . . BRUSHES AND SPRINGS-REPLACEMENT
BRUSHES AND SPRINGS-REPLACEMENT
(1) Brushes
(1)
Brushes that
that are
are worn
worn more
of the new brush, or are oil-soaked, should be replaced.
of the new brush, or are oil-soaked, should be replaced.
The br brush
The
ushes es and
and sp sprin
rings gs can
ing the commutator end head and brush plate.
ing the commutator end head and brush plate.
(2) Lift the brushes, disengage the brushes from the
(2) Lift the brushes, disengage the brushes from the
brush holders and remove the brush plate.
brush holders and remove the brush plate.
(3) Disconnect field lead wires at solenoid con-
(3) Disconnect field lead wires at solenoid con-
nector (Fig. 3).
nector (Fig. 3).
(4) Remove the screw attaching the ground brush
(4) Remove the screw attaching the ground brush
terminal to the field frame and raise the brushes and
terminal to the field frame and raise the brushes and
terminal up and away from the field frame (Fig. 7).
terminal up and away from the field frame (Fig. 7).
NOT
NOTE.
E. The leads are
The leads are not
Check brush leads before cutting to insure
Check brush leads before cutting to insure
pr
pr op
op er er length
length at at installation.
installation.
Fig. 7-Removing or Installing Ground Brushes
Fig. 7-Removing or Installing Ground Brushes
Terminal
Terminal
SHIFT ER FO
SHIFT
ER FORK
RK
61x23
61x23
more than
than
the
the leng
leng th th
can be be rep
replac
laced ed aft
after er rem
remov-
not equal in length.
equal in length.
(6) Open the brush lead clips to remove the old
(6) Open the brush lead clips to remove the old
brush leads.
brush leads.
(7) When re
(7) W
hen resolder
soldering
strong, low resistance connection using a high tem-
strong, low resistance connection using a high tem-
perature solder and resin flux. Do not use acid.
perature solder and resin flux. Do
no t break shunt wire when removing and installing
no t
break shunt wire when removing and installing
. .
ground brushes.
ground brushes.
(8) Brush springs can be removed by spreading the
(8) Brush springs can be removed by spreading the
retainers and disengaging the springs from the re
retainers and disengaging the springs from the re
tainer
tainer
legs.
legs.
(9) Measure the brush spring tension with a spring
(9) Measure the brush spring tension with a spring
scale hooked under the spring near the end. Pull the
scale hooked under the spring near the end. Pull the
scale on a line parallel to the edge of the brush and
scale on a line parallel to the edge of the brush and
take a reading just at the spring end leaves the brush.
take a reading just at the spring end leaves the brush.
Spring tension should be 32 to 48 ounces. Replace
Spring tension should be 32 to 48 ounces. Replace
springs that do not meet specifications.
springs that do not meet specifications.
8. TESTING THE ARMATURE
8. TESTING THE ARMATURE
Testing the Armature for Short Circuit
Testing the Armature for Short Circuit
Place armature in growler (Fig. 8) and hold a thin
Place armature in growler (Fig. 8) and hold a thin
steel blade parallel to core and just above it, while
steel blade parallel to core and just above it, while
slowly rotating armature in growler. A shorted arma-
slowly rotating armature in growler. A shorted arma-
ov-
ture will cause blade to vibrate and be attracted to
ture will cause blade to vibrate and
core. Replace a shorted armature.
core. Replace a shorted armature.
Testing Armature for Ground
Testing Armature for Ground
Touch ch arm
Tou
armatu
ature re sh shaft
with a pair of test lamp prods (Fig. 9). If lamp lights,
with a pair of test lamp prods (Fig. 9). If lamp lights,
it indicates a grounded armature. Replace grounded
it indicates a grounded armature. Replace grounded
armature.
armature.
Testin
Tes
ting Commu
g Commutat
tator or
Place armature in pair of "V" blocks and check
Place armature in pair of "V" blocks and check run-
out with dial indicator. Check both shaft and commuta-
out with dial indicator. Check both shaft and commuta-
tor. A. bent shaft
tor. A.
bent shaft requires replacement of
Fig. 8-Testing Armature for Short
Fig. 8-Testing Armature for Short
ing the brush leads,
the brush leads, make a
not use acid. D D
be attracted to
aft and
and end
end of of a a com
commut
mutato
Run-Out
Run-
Out, Refac
, Refacing
ing
requires replacement of armature.
make a
O O
ator r bar
bar
run-
armature.
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