ARMY TM 9-6115-464-34
AIR FORCE 35C2-3-445-2
NAVY NAVFAC P-8-624-34
Solvent, Dry Cleaning P-D-680, Type II is flammable and moderately toxic to skin,
eyes and respiratory tract. Eye and skin protection required. Good general ventilation
is normally adequate. Failure to observe this warning could result in servere personal
injury or death.
Clean special relay components with filtered compressed air and a soft bristle brush. If necessary,
dirt deposits may be removed with a clean, lintfree cloth moistened with solvent P-D-680 Type II in
Inspect potentiometer for cracked casing, corroded terminals and burns or other indication or
Inspect wiring harness assembly for cracked or deteriorated insulation, damaged or loose connector
pins, and burned areas indicating shorting.
Inspect protective caps for cracks, excessive wear, broken chain and other damage.
Inspect components of DC relay assembly for cracks, burns, corrosion, and evidence of shorting or
Inspect instrument shunt for burns, corrosion, and evidence of shorting.
Inspect special current transformer for corroded terminals and burns or other evidence of shorting.
Inspect cranking relay K3 for cracked casing, corroded terminals, and evidence of shorting.
Inspect terminal boards for cracks, burns, corroded terminals and terminal jumpers and other
Inspect resistor for burns, corroded terminals and other damage.
Inspect chassis and cover for cracks, warping, and illegible markings.
Check all threads for crossing, stripping, and peening.
Using an ohmmeter, test potentiometer as follows:
Connect ohmmeter leads between center terminal and either outer terminal.
Slowly, at an even rate, rotate adjustment from full counterclockwise to full clockwise position.
Ohmmeter indication shall change at an even rate from 0 to 12 ohms.
Replace potentiometer if ohmmeter indicates discontinuity at any point or if rate of change is
Test wiring harness assembly wires for continuity using figure 3-120 as a guide.
If wiring, wiring harness has sustained damage and requires repair or rebuild, refer to figure 3-120
for layout, identification and material requirements and Appendix A for detailed soldering and