Frame & Field Coil; Terminal Assembly And Torque - Columbia ParCar P4G Service Manual

Motor #
XP Motor New
Part#
# 69200-89A Worn
(Minimum)
Power New
Master
Motor Part Worn
# 69300-97 (Minimum)
Frame & Field Coil
Note. Do not remove the field coils from the motor frame
unless it is absolutely necessary. Removal and re-instal-
lation could shorten field coil life.
There should be no continuity between the frame of the
motor, and field coil. Field coil resistance should be:
Table 14-Field Coil Resistance at 75º F. (23º C)
XP Motor Part
# 69200-89A
Power Master
Motor Part # 69300-97
If removal is required:
1. Remove two pole shoe bolts from each pole shoe
(laminated steel bar).
2. Carefully pry each pole shoe from the coils, using
care to prevent nicking or scratching the insulation
on field coils.
3. Remove the field coil terminal nuts, washers and
insulators.
4. Carefully, begin lifting the field coils from the frame,
starting at one terminal stud and working around to
the opposite. Remove the coil from the frame.
Motors that have been disassembled for servicing should
also include a complete inspection of the frame and field
assembly. It is not uncommon that the frame and field of
a motor becomes exceptionally dirty after many hours of
operation. This may result in a grounding condition due
to dirt, grease and other foreign materials.
In this case it is recommended to clean the complete
frame and field in a cleaning solution of Safety-Kleen 105
washing solvent or an equivalent product. After cleaning,
the frame and field must be oven-cured for one hour at
300F (148C). It is recommended to add a coat of WS-
200 PT George varnish for proper Insulation protection.
This is a class H water-soluble varnish. A similar air-dry
varnish may also be used providing it has a class H
thermal specification.
Table 13
Spring Tension
65 Oz. (1820 Grams)
40 Oz. (1120 Grams)
65 Oz. (1820 Grams)
40 Oz. (1120 Grams)
.013 Ohms
(± 10%)
2.20 Ohms
(± 10%)
Assemble field coil terminals as shown in Figure 30.
Motor terminals should be torqued to 140 in./lbs. (15.5
N.m.). Pole shoe screws should be torqued to 250 - 300
in./lbs. (28 to 33.5 N.m.).
Figure 30 - Terminal Assembly and Torque
Assembly
1. Install brush holder into motor end housing (if
removed).
2. Always, use a new bearing when servicing a motor.
Press bearing into motor end housing, press only
against the outer race.
3. Add snap ring to retain bearing.
4. Install brush holder into motor end cover as shown in
Figure 25. Install insulators and brush leads into
cover, see Figure 31. Motor terminals should be
torqued to 140 in./lbs. (15.5 N.m.).
5. Install brushes partially into holders, wedging the
brush spring against the sides of each brush. This
will hold the brush up within each holder, to prevent
interference and damage to brushes and armature
during assembly.
6. Press motor end housing and bearing onto armature,
pressing only against inner race. See Figure 31.
7. Install brush springs then partially insert each brush
into its holder, allowing the spring to rest against the
side of each brush. This will hold each brush in
place, preventing interference and damage to com-
mutator and brushes during armature installation.
8-28