1
Commutator-end spacer washer
21
Shaft spring screw
2
Armature
22
Driving shaft assembly
3
Woodruff key
23
Drive spring
4
Field coil assembly
24
Spacer washer
5
Pole shoe
25
Pipe plug
6
Field frame
26
Oil wick
7
Pole shoe screw
27
Drive-end bushing
8
Insulation strip
28
Drive housing
9
Terminal stud
29
Cover band
10
Center bearing screw
30
Screw, rd hd, No. 8-32 x 5/16 (4 req)
11
Center bearing lockwasher
31
Brush lead lockwasher
12
Center bearing
32
Brush
13
Terminal stud bushing
33
Brush spring
14
Insulating washer
34
Commutator-end bushing
15
Nut, hex, 3/8 -16
35
Dowel pin
16
Terminal stud lockwasher
36
Commutator-end frame
17
Terminal stud locknut
37
Commutator-end plug
18
Drive head assembly
38
Through-bolt lockwasher
19
Locking clip
39
Through-bolt
20
Head spring screw
Figure 90. -- Continued.
brushes and commutator after the unit is reassembled. Check by placing the armature and the commutator-
end frame together in their normal operating position. Place the. brushes in their holders with the springs in
place. Check with a spring scale the amount of pull needed to raise the brush arms from the brushes.
Replace the springs if the tension is not from 36 to 40 ounces.
(6) Bearings. Replace the bearings if they are worn. Wear will not be even, but on the side which sustains the
greatest thrust during starting. Where bearing is lubricated by an oil wick, drill an oil hole for the wick.
Remove all cuttings and install a new wick.
(7) Brush holders. Replace the brush holders if they are bent, warped, cracked, or burned.
e. Reassembly (fig. 90). Slip the brush springs (33) on the brush arm hinge pins. The long tong of the spring goes
back of the arm. Catch the short hooked end of the spring and hook it over the stop pin. Attach the brushes (32) with the
roundhead screws (30) and lockwashers (31) to the brush holders. At the same time, attach the two brush grounding
leads to the grounded brush holders. Attach the other ends of the leads to the commutator-end frame (36). Place the
armature (2) in soft vise jaws. Install the spacer washer (24) and the center bearing (12). Insert the woodruff key (3) in
199
