TM 11-6140-203-14-4&P
impaired and the duration of equipment operation
4-5. Operator Daily Preventive Maintenance Checks
severely limited.
and Services Chart (At Equipment Site)
4-9. Visual Inspection
Sequence
Item to be
Procedure
Reference
Many causes of battery failure may be detected by visual
No.
inspected
inspection. Because the battery cannot be disassembled
1
Overall Bat-
Clean top of cover.
by organizational repair technician, visual inspection is
tery
limited to observing the assembled battery. Visual
2
Overall Bat-
During operation be
None
inspection is accomplished as follows:
tery
alert for any
CAUTION
abnormal condition.
Fumes from lead-acid batteries can cause serious
3
Manual
Check to see that two
None
damage to nickel-cadmium batteries. If nickel-
Vent
valves in cover are
cadmium batteries are located in vehicle with lead-
Valves
open (close only for
acid batteries, do not open any cell on nickel-
fording operations).
cadmium batteries until the vehicle engine is turned
4-6. Organizational Weekly Preventive Maintenance
off and the lead-acid batteries are covered.
Checks and Services Chart for Battery BB-693IU
a. Damage Release the snap fasteners, remove the
Sequence
Item to be
Procedure
Reference
cover, and check the battery for the presence of (1)
No.
inspected
through (7) below. If any of these faults are found during
1 Battery,
inspect battery.
the inspection, appropriate corrective steps should be
BB-694
performed.
A/U
(1) Battery case or cover scratched or
2
Charge battery.
dented(para 4-14).
3
Check electrolyte
(2) Battery case liners or cover gasket loose or
level of each cell in
damaged (turn into support maintenance).
battery.
(3) Cell terminal screws bent or broken (turn into
4
Check leakage
support maintenance).
current of each
(4) Cell cases cracked (turn into support
battery.
maintenance).
NOTE
(5) Cell vent caps warped or cracked (para 4-
If leakage current is above ratings in paragraph
17). Replace with pretested vent cap..
(6) Battery connector bent or broken (turn into
dried.
support maintenance).
4-7. Organizational Monthly Preventive Maintenance
(7) Battery case pressure relief valve plugged or
Checks and Services Chart
broken (support maintenance).
1
Overall
Inpect battery
b. Improper Installation. Check the battery for
Bat-
improper installation as indicated below:
(1) Cell vent caps improperly seated.
2
tery
Clean battery.
(2) Cell terminal screws loose (para 4-16c).
3
Charge battery
(3) Battery terminal links between cells loose
4
Check electrolyte
level
c. Excessive Electrolyte Spewage. In normal
of each cell in battery.
operation, a nickel-cadmium battery will look as if it had
5
Check leakage
been spattered with white paint on the inside of case,
current
cover, and cell tops. Electrolyte carried out of the cell by
of each battery.
gassing and bubbling is converted into harmless
4-8.
Organizational
Quarterly
Preventive
potassium carbonate in the air. Excessive spewage is
Maintenance Checks and Services
indicated by liquid collected on the top of vent caps and
Organizational quarterly maintenance is limited to
cell tops or in the battery case. It is primarily caused by
removal of the battery from the equipment and returning
excessive charging voltage, overfilling the cells in a
it to higher category of maintenance for reconditioning.
discharged condition or extensive use of low rate fire
The battery must be returned to higher category
mode. After charging be sure to adjust electrolyte level.
maintenance for reconditioning if it has been in service
for 90 days. More frequent servicing maybe required if
extensive low rate fire rates are used or extreme
environmental conditions are continuously encountered.
Do not allow the battery to remain in operation longer
than 90 day period since its storage capacity will be
greatly
4-2
