Test. - TM-10-3930-620-340113

f. Test.

3-41. Steer Axle

(1) Check the armature for shorts by placing it

a. Removal. Remove the steer axle according to

on a "growler" and with a steel strip or a hacksaw blade

held on armature core, rotate armature. If blade vibrates,

d. Disassembly. Disassemble according to figure 3-

armature is shorted in area of the core below the

74 and as follows:

vibrating blade. Copper or brush dust in slots between

(1) Remove mounting blocks (47) from steer

commutator bars sometimes causes shorts which can be

axle and press off the bushings (48).

eliminated by cleaning out slots. Shorts at crossovers of

(2) Remove spindles (38 and 39) by pressing

coils at core end can often be eliminated by bending wire

out spring pins (34), king pins (36), and needle bearings

slightly and reinsulating exposed bare wire. If shorts

(40).

cannot be eliminated, armature must be replaced.

(3) To remove tie rods, remove cotter pins (2),

(2) To test armature for grounds, place one

and loosen adjusting plugs (10 and 18).

probe of test lamp on armature core or shaft and place

(4) To remove pivot arm, remove lubrication

the other probe on each commutator bar in turn. If lamp

fitting (25), elbow (26), washers (27 and 28), wedge bolt

lights, armature is grounded and must be replaced.

(24) and pin (29). If it is necessary to replace a ball stud,

(3) To test for grounded fields, place one

file off staked area of stud before removing it.

probe of test lamp on field frame and the other probe on

Caution:

Make certain

field terminal. If lamp lights, field coils are grounded and

all staked area has been filed off

must be replaced if ground cannot be located and

before removing stud.

repaired.

c. Cleaning and Inspection.

(1) Clean parts with a solvent such as mineral

spirits, and dry with compressed air. Check all parts for

wear and damage.

3-85