23
Service and Maintenance
Description, Specifications, Installation, Operation, and Service Manual
Federal Signal
www.fedsig.com
NOTE:
It is not necessary to follow the procedure described in steps 8 through 11 if a
hydraulic press is available to press the replacement field into the motor housing.
8.
Fabricate two 8-inch (203 mm) guide pins from 3/16-inch (5 mm) metal rod. Taper
these pins as indicated in Figure 8.
9.
Insert the tapered end of the pins into the threaded holes in the field holder ring as
indicated in Figure 8.
10.
Set the new field on the motor housing with the guide pins passing through the two
mounting holes in the body of the field as shown in Figure 8. Be sure that the four
wires are in the position shown in Figure 8.
11.
Set a length of 3/8-inch (9.5 mm) steel bar stock approximately 5 inches (127 mm)
long, or a similar object, on the field as illustrated in Figure 8. Drive the field into the
motor housing by firmly and squarely tapping the bar with a hammer. Use caution to
avoid cutting or otherwise damaging the wires that are connected to the field.
12.
Connect the two wires having rings to the motor brush holders, one wire to each
brush holder.
13.
Reinstall the field-retaining ring.
Figure 8 Model 2 Field Replacement
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