Section VI. TROUBLESHOOTING - TM-5-4320-273-140048

TM 5-4320-273-14

Table 41. Organizational Preventive Maintenance

Q - Quarterly

Checks and Services Continued

Total manhours required: 10.0

ITEM TO BE INSPECTED

SEQUENCE

U/M

NUMBER

PROCEDURE

NUMBER

MAGNETO

0.5

Check breaker point opening. It must be -015 inch (0.03 cm). Replace burned points

and adjust point gap.

OIL PRESSURE SWITCH

0.3

Check for damage. Make sure switch spring clip disengages at engine startup and that

switch trips at engine shutdown. Replace faulty switch.

FIRE EXTINGUISHER

Inspect for full charge, proper working condition, and secure mounting. Replace if

0.2

gage indicates low charge.

FRAME ASSEMBLY

Check condition of frame and stowage boxes and for missing reflectors and data plates.

0.4

WHEEL ASSEMBLY

0.5

Clean and check for damage. Ensure that wheel bearings have been lubricated in

accordance with LO 5-4320-272-12. Adjust the wheel bearings.

ENGINE COMPRESSION

Check the engine compression.

1.0

Section VI. TROUBLESHOOTING

4-ll. General

c. Only those functions within the scope of organiza-

tional maintenance are listed For trouble shooting

a. This section contains troubleshooting information

procedure within the scope of operator/crew maintenance,

refer to table 32.

which are the responsibility of organizational maintenance.

Each malfunction for an individual component, unit, or sys-

4-12. Organizational Maintenance Troubleshooting

tem is followed by a list of tests or inspections which will

Chart.

help you to determine probable causes and corrective actions

to take. Perform the tests/inspections and corrective actions

Refer to table 42 for troubleshooting which is allocated to

in the order listed.

the organizational maintenance level

b. This manual cannot list all malfunctions that may

NOTE

occur, nor all tests or inspections and corrective actions. If a

malfunction is not listed or is not corrected by listed correc-

Before you use this table, be sure you have per-

tive actions, notify your supervisor.

formed all applicable operating checks.

Table 4-2. Troubleshooting

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

ENGINE

1. ENGINE FAILS TO CRANK WHEN STARTING BUTTON IS DEPRESSED.

NOTE

distilled water or a good grade drinking water (excluding mineral water).

Use

Step 1. Check for weak or dead battery with a hydrometer. Hydrometer reading should be at least 1.250 or higher at 75 F

(23.8C). Service battery by removing caps and checking the electrolyte level in each cell. If low, fill to level of

3/8 inch (0.93 cm) above plates with distilled water.

WARNING

Do not smoke or use an open flame in the vicinity when servicing the battery. Batteries generate hydrogen gas,

which is highly explosive. Charge the battery using a constant current charger. Check the specific gravity of the

electrolyte every 30 minutes. The battery is fully charged when you get a constant reading for three 30 minute

intervals.

CAUTION

Constant current battery charging is always preferred. If you must use a constant-potential charger, battery tem-

peratures must be maintained at less than 130F (54.4C) by interrupting the charging procedure as this

temperature is approached.

4-4

Change 4