Komatsu 830E-AC Shop Manual page 142

4. Refer to Figure 4-6. Alternator End-play:
a. Using a flat steel bar (3, Figure 4-6) bolted
rigidly to the alternator rotor (2), install a 5/8"
- 11 cap screw (4) at each end into the alter-
nator housing (1). Leave cap screws finger-
tight.
b. Move the alternator rotor (2) axially towards
the rear (slip-ring end) by alternately tighten-
ing the cap screws (4) one-half-turn-at-a-
time. Do NOT exceed 16.3 N·m (12 ft lbs)
torque on each cap screw. This establishes
the maximum permissible rear travel for the
alternator rotor.
c. Alternately loosen the cap screws (4) one-
turn-at-a-time, until all torque is released.
Carefully remove the bar (3).
Note: The object is to leave the rotor in its
most rearward position.
Refer to Figure 4-5.
d. Carefully measure Dimension "A" (Do not
move alternator rotor) at four locations, 90°
apart, and average the measurements.
1st measurement: _________________________
2nd measurement: ________________________
3rd measurement: ________________________
4th measurement:_________________________
Dimension "A": ____________________ Average
e. Add 0.254 mm (0.010 in.) to Dimension "A".
f. Record (d + e) as;
"Measurement A": _________________________
5. Determining Shims: Compare "Measurement
C" (Step 3.c.) with "Measurement A" (Step 4.f.).
a. If C is greater than A, subtract: (C - A) = B
B = _____________ Shim pack thickness
to be installed at location "B", Figure 4-5.
Rotor-to-Drive Ring, Location "B"
Shim Part Number
TM3467
TM3469
C4-6
Shim Thickness
0.102 mm (0.004 in.)
0.178 mm (0.007 in.)
Power Train
FIGURE 4-6. ALTERNATOR END-PLAY
1. Alternator Housing
2. Alternator Rotor
b. If A is greater than C, subtract: (A - C) = D
D = ___________ Shim pack thickness to
be installed at location "D", Figure 4-5.
Alternator-to-Flywheel Housing Adapter,
Location "D"
Shim Part Number
TM3466 0.102 mm (0.004 in.)
TM3468 0.178 mm (0.007 in.)
3. Steel Bar
4. Cap Screw
Shim Thickness
C04034