CHAPTER 5 DIRECT SUPPORT MAINTENANCE - TM-11-6140-224-13-P0025

TM 11-6140-224-13&P

CHAPTER 5

DIRECT SUPPORT MAINTENANCE

5-1. General Instructions

The direct support maintenance procedures given in paragraphs 5-3, 5-4 and 5-5 supplement the procedures described

for the organizational maintenance repairman. Tools, materials, and test equipment required for maintenance are listed in

paragraph 5-2 and Appendix B, Section III. Direct support, general support, and depot maintenance for the storage battery

consists of the following:

a. Constant Current Charging Procedure - paragraph 5-3

b. Direct Support Troubleshooting Chart - paragraph 5-4

c. Capacity Discharge Test - paragraph 5-5

5-2. Test Equipment, Tools, and Materials

a. Power Supply, PP-6148/U

b. Cable Assembly ES-D-212025, or

c. Cable Assembly ES-D 212028

d. Multimeter TS-352BfU, or equivalent

e. Resistor 20 ohms, 50 watt

Resistor, Variable, 0-7.5 ohms, 1,000 watt (NSN 5905-00-195-4496)

5-3. Constant Current Charging Procedure

a. Place the storage battery on a clean dry surface as close as possible to the PP-6148/U, or equivalent power

supply.

b. Release the two snap fasteners and remove the cover from the battery case.

c. Turn on power and adjust the PP-6148/U to the current and voltage given in table 4-1. Turn PP-6148/U off.

d. Connect cable from PP-6148/U to BB-542/U and turn PP-6148/U on. Verify that specified current is flowing.

e. Charge will continue until the pressure switch cutoff is reached. The battery is fully charged at this time;

however, it may be left connected to the charge without damaging the battery. At normal temperatures the pressure switch

will reset approximately every 15 minutes due to the drop in internal cell pressure to permit about 30 seconds of additional

charge.

5-4. Direct Support Troubleshooting Chart

The Direct Support Troubleshooting Chart, table 5-1, is provided to aid in isolating troubles that could occur in the storage

battery. Before following the procedures outlined in the chart, visually inspect the storage battery to determine whether the

trouble is caused by loose or corroded connections, fluid in the battery, or a broken wire.

5-5. Capacity Discharge Test

Testing will supplement the troubleshooting procedures in determining the cause of troubles which may occur in the

storage battery.

WARNING

Do not discharge a storage battery by short-circuiting its output terminals. This practice

may damage the battery and can cause severe burns if the shorting bar is held in the

hand.

After the storage battery is fully charged, discharge the storage battery at a temperature of 600 to 80F at 4.0 amperes for

exactly 15 minutes (1.0 ampere hour). Use cable assembly ES-D-212028, Multimeter TS-352B/U, and resistor, variable 0

to 7.5 ohm, 1,000 watt (NSN 5905-00-195-4496). After 15 minutes of discharge, the closed circuit, battery minimum

voltage should be 20 volts. If the storage battery is less than 20 volts, or has cutoff, the s' rage battery is defective.

5-1