Columbia ParCar Expediter EX21-24A, Service Manual

Page: 91 / 94

Section 10 – Traction Drive System
Columbia.
INSPECTION
Figure 10-13
Motors that have been disassembled for servicing should also
include a complete inspection of the frame and field assembly. It
is not uncommon for the frame and field assembly of a motor to
become exceptionally dirty after many hours of operation. This
may result in a grounding condition due to dirt, grease and other
foreign materials.
MOTOR REASSEMBLY
1. Always use a new bearing when reassembling a motor.
Press bearing into motor head. Press only against the outer
race. See Figure 10-15. Install snap ring to retain bearing.
Figure 10-16.
2. Assemble brush assemblies into brush box assembly.
3. Position brush holder into motor head as shown in Figure
10-16. Make sure that the terminals for the brushes are
loose and free. Figure 10-14
4. Install insulators and brush leads into motor head. See Figure 10-17. Brush motor terminals, A1 and
A2, should be torqued to 140 in. lbs. (15.8 Nm).
BEARING
After the motor has been disassembled, it is recommended
that a new bearing be installed. Bearing may appear and feel
ok, however, bearing may have been damaged during
removal.
FRAME AND FIELD COILS
NOTICE Do not remove the field coils (9 , Figure : 10 -
, from the motor frame unless it is absolutely 9)
necessary for repair. Removal and re - installation
could shorten field coil life.
There should be no continuity between the frame of the motor
and field coil (Figure 10-9). Set the volt ohm meter (VOM) to
measure Ohms. See Figure 10-14.
FIELD COIL MAINTENANCE NOT recommended by
Figure 10 - 11
Figure 10 - 12