3-62. TRACTION MOTOR ASSEMBLY (cont)
d. Observe the contact area of pinion gear bore. If inspection shows bluing to cover less than 75 percent of total
contact surface, use a fine grade of sandpaper and sand armature shaft and pinion gear bore. Repeat steps a
Drycleaning solvent P-D-680 is toxic and flammable. Wear protective goggles and gloves and use only
in a well-ventilated area. Avoid contact with skin, eyes, and clothes and don't breathe vapors. Do not
use near open flame or excessive heat. The flash point is 100-138°F (38-59°C). If you become dizzy,
get fresh air immediately and get medical aid. If contact with eyes is made, wash your eyes and get
medical aid immediately.
Compressed air used for cleaning purposes will not exceed 30 psi (207 kPa). Do not direct compressed
air against skin. Use goggles or full face shield.
e. Use drycleaning solvent and remove bluing from armature shaft and pinion gear bore. Dry with compressed air.
f. Install pinion gear on armature shaft and give it a push against traction motor cover.
g. Use a depth gauge and measure pinion gear position in respect to the shaft. Record reading.
h. Use chalk and mark points of contact between depth gauge, pinion gear, and armature shaft so that pinion gear
can be remounted in exactly the same position.
i. Lightly drive a wedge between pinion gear and traction motor cover and remove pinion gear.
j. Set pinion gear on an induction heater and heat to 273.2F (134C) above shaft.
Heated parts may cause injury to personnel if hand protection is not worn when handling. Wear protective
gloves for maximum protection.
k. Remove pinion gear from heater and install on armature shaft. Line up chalk marks on pinion gear and armature
shaft. Push pinion gear towards traction motor cover.