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TM 5-4320-306-24
3-18. REPAIR ALTERNATOR, V-BELT PULLEY, AND FAN (Continued )
CAUTION
Protect diodes from heat when desoldering. Grasp the diode lead with a needle nose pliers to give
better heat dissipation. Heating the diode may damage it.
10
Tag and desolder positive diode leads, negative diode leads, trio diode leads, and stator leads. Desolder and
disconnect common stator leads.
CLEANING/INSPECTION/REPAIR
WARNING
Dry cleaning solvent P-D-680 (safety or Stoddard's Solvent) is potentially dangerous. Avoid
repeated and prolonged breathing of vapors and skin contact with the liquid. Do not use near
open flame, arcing equipment, or other ignition sources. Always wear eye protection and
protective clothing. The flash point of P-D-680 is 100° to 138 °F (38° to 59°C).
1
Clean with dry cleaning solvent. Inspect front housing and rear housing for cracks, corrosion, and stripped
threads. Inspect bearing bores for wear. Replace a damaged housing.
2
Wipe bearings clean with a cloth, taking care not to disturb bearing seals Inspect front and rear bearings for
smooth rotation and for cracked or broken seals. Replace if damaged.
3
Clean stator with dry cleaning solvent Inspect stator for gouged or discolored windings. Inspect leads for frayed
or damaged wires or damaged insulation. Replace if damaged or discolored.
4
Inspect rotor shaft (1) for damaged threads or worn key slot. Wipe slip rings (2) with crocus cloth, then remove
all residue with clean cloth. Inspect slip rings for cracks or wear grooves. Replace if damaged
5
Inspect leads of positive diode assembly, negative diode assembly, and trio diode for wear or fraying. Clean with
dry cleaning solvent. Inspect all diodes for discoloration. Replace if damaged.
6
Clean insulator and insulating washers with dry cleaning solvent. Inspect for cracks. Replace if damaged.
7
Clean brush assembly with dry cleaning solvent. Inspect for cracks or oil soaking. Replace if damaged.
Replace if length of brushes is less than 3/16 inch (4.8 mm).
3-90
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