Figure 3-5. Checking alternator output.

(b) During reassembly, carefully note the

tape is removed.

(3) When alternator is assembled, withdraw the

alignment of parts as shown in figure 3-1.

e. Alternator reassembly.

brush retaining wire through the hole in the end frame,

allowing the brushes to contact the sliprings.

(1) The reassembly of the alternator is a reverse

f. Alternator test.

of the disassembly (fig. 3-1).

(1) To check the alternator on a test bench,

(2) Avoid excessively tightening the rotor in a

make an electrical hook-up as shown in figure 3-5,

vise as this could distort the entire rotor assembly. After

operate at specified speed and check for rated output.

installing the pulley assembly, tighten the shaft nut to 50-

See table 3-1.

60 ft. lbs. Before installing the slipring end frame

(2) Adjust the load rheostat, if necessary, to

assembly, remove the protective tape from the bearing

obtain, the desired output.

end shaft, making sure shaft is completely clean after

Figure 3-5. Checking alternator output.

Table 3-1. Alternator Specifications

Field current

Cold output

(80F)

at specified voltage

Rotation

Rated

viewing

Spec

Approx.

Amp

Approx.

hot output

D.E.

Grd

Amps

Volts

volts

Amp

R.P.M.

amp

Neg

1.9-2.3

14.0

1100

6500

(1) Secure starter motor in bench vise at drive

3-3. Starter Motor

end of unit. Be careful not to damage drive end housing.

a. Removal and Installation. Refer to TM 10-3930-

(2) Remove the two through bolts (15, fig. 3-6)

618-20 and remove or install the starter motor.

and slide commutator end frame (1) and field frame from

b. Disassembly. Disassembly should pro-

armature.

ceed only so far as is necessary to make repairs or

replace defective parts.

3-5