Commutator End Frame

ELECTRICAL

7. Overrunning Clutch. Drive pinion must rotate

4. Commutator End Frame

freely in overrunning direction and must not slip in

cranking direction. If drive pinion turns roughly or slips,

a. On open shift lever type, brush holders are

replace complete overrunning clutch assembly.

mounted on commutator end frame. Two brush

holders are insulated from the end frame and two

8. The Bendix drive should be cleaned and a film of

are grounded. Test each insulated brush holder

light oil applied to the screw shaft, as any accumulation

by placing one test prod on insulated brush holder

of dirt on drive might restrict the free movement of the

and one on end frame. If the lamp lights, brush

pinion.

holder is grounded and the insulation should be

replaced.

G. ASSEMBLY (Fig. 31)

b. On enclosed shift lever type, the insulated

1. Place a few drops of engine oil on bushing in

brush holders, mounted in the field frame, are

commutator end frame and in drive housing. Spread oil

made of a nonconductor and are mounted on the

evenly on bushing.

same pin as the grounded brush holders.

2. If shift lever and solenoid plunger were removed

c. Examine armature shaft bushing in end frame

from drive housing, assemble plunger to shift lever and

for wear. Replace bushing if hole is elongated.

secure lever in housing with bolt, lock washer, and nut.

Make sure shift lever pivots freely on bolt.

d. Check brush spring tension. If not within limits,

replace the new springs. Examine hinge pins and

3. Install overrunning clutch assembly on armature

brush holders for bent or damaged condition. Any

shaft as follows:

condition which might prohibit free brush action

must be corrected.

a. Apply a light coat of engine oil on armature

shaft spiral splines.

5. Brushes

b. Place assist spring over armature shaft with

a. If brushes are worn down to less than one-half

small end of spring against armature, then slide

their original length, they must be replaced.

overrunning clutch assembly on shaft with drive

Compare old brushes with a new one to determine

pinion toward end of shaft.

how much they are worn.

c. Slide retainer onto shaft with cupped side

b. Be sure that clips are securely soldered to the

facing end of shaft.

brush leads. When installing new brushes, side

having trade mark must be out away from holder.

d. Install snap ring over end of shaft and place in

groove in shaft. Use care not to distort snap ring

6. Drive Housing. Examine bushing in drive

while installing.

housing if worn excessively. Also replace oiler wick, if

used. If necessary to replace shift lever (or solenoid

e. Install thrust collar on shaft with shoulder on

plunger on enclosed shift lever type), remove bolt

collar next to snap ring.

securing shift lever in drive housing.

B-78