Brush Service
Check the brush springs for correct alignment on the
back of the brush. A brush spring that does not apply
equal pressure on the center of the brush will cause the
brushtowearunevenly.Checkforcorrectclearanceand
freedom of brush movement in the holder.
3. It is also recommended that the field be coated with
PD George 1000--70 or RanBar B--535--5S varnish for
proper insulation protection. Both recommended var-
nishes are Class H water--soluble varnishes. A similar
air--dry varnish may also be used providing it has a
Class H rating.
1.
4.
be torqued from 250 to 300 in--lb (28.3 to 33.9 N--m)
(Fig. 59).
Screws securing the pole pieces to the frame should
2.
(16
even wear or show signs of overheating, such as discol-
ored brush shunts and brush springs.
Replace brushes that are worn to a length of 0.620”
mm). Also, replace brushes if they show signs of un-
3
3.
Brushes should always be replaced incomplete sets
of eight. Use identical replacement parts; do not substi-
tute brush grades as the brushes are matched to the
motor type and application to provide the best service.
Substituting brushes of the wrong grade can cause pre-
mature commutator failure and excessive brush wear.
Remove old brushes and replace with identical replace-
ment parts. Hold brush shunts in position and torque
brushscrewsfrom18to22in--lbs(2.0to2.5N--m)(Fig.
2
1
Figure 57
1.
2.
Motor housing
Puller
3.
Arbor press
59).
Make sure brushes move freely in the holders and
thatshuntsdonotinterferewithbrushspringmovement.
4.
Make sure the brush box assembly is tight on the
1
commutator end head. Replace brush box assemblies
in the commutator end head if they are physically dam-
aged or brush holders are loose on the brush plate.
5.
using the following procedure (Fig. 58):
Brush springs should be checked for proper tension
2
3
A. Place paper strip between brush face and com-
mutator. Hook spring scale as shown.
B. Pull spring scale on a line directly opposite the
line of force exerted by the brush spring. When the
paperstripbeginstomovefreely,readthespringten-
sion on the scale. Brush tension for a new brush
should be 65 ounces (1820 grams) and for a worn
brush should be 40 ounces (1120 grams).
Figure 58
3.
1.
2.
Spring scale
Brush spring
Paper
2
Frame and Field Service
1.
Motors that have been disassembled for servicing
should be given a complete inspection of the frame and
field assembly. If damage to the field coils or frame is
found, replace traction motor. Individual frame and field
components are not available.
2
1
2.
Accumulated carbon dust, grease and other foreign
material can produce a ground path from the field wind-
ing to the frame. The frame and field should be cleaned
with Safety--Kleen 105 washing solvent or equivalent.
After cleaning, the frame and field must be oven--dried
for one hour at 300oF (148o C) to remove any cleaning
Figure 59
2.
1.
Brush screw
Pole piece screw
residue.
Workman MDE
Electrical System
Page 3 -- 39
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