Section II. TROUBLESHOOTING
a. This section provides information useful in diagnosing and correcting' unsatisfactory operation or failure of the
power plant and its components. Malfunctions which may occur are listed in table 22. Each malfunction stated is
followed by a list of probable causes of the trouble. The corrective action recommended is described opposite the
b. Information concerning the use of special test equipment as an aid to troubleshooting is provided in paragraph 2-
4 of this section.
Table 2-2. Troubleshooting
1. Fuel boost pump motor assembly
a. Defective fuel boost pump motor
a. Check that 24 VDC is present at
fails to operate (batteries
fuel boost pump connector P35.
If 24 VDC is present, repair or
voltage is not present, continue to
b. Defective wire harness assembly.
. Test wire harness assemblies (para
5-3, 5-26, 5-24, 5-33, and 5-34).
2. Starter motor runs but does not
Defective starter motor clutch.
3. Engine stops motoring when
No-fuel relay (K44) defective.
master switch is released from
START to RUN position.
a. Low oil or depleted fuel supply.
a. Service power plant as required.
does not occur.
(see TM 5-6115-586-12.)
b. Fuel filter clogged or defective.
b. Clean, repair, or replace fuel filters
Fuel control assembly failed.
c. Repair or replace fuel control
e. Oil pressure sequencing switch
e. Replace oil pressure sequencing
switch. (see TM 5-6115-586-12).
f. Fuel atomizer screen obstructed.
f. Clean or replace screen (para 3-7).
5. Engine starts but will not ac-
a. Control air lines leaking.
a. Tighten or repair control air line
celerate to governed speed or
accelerates too slowly.
b. Fuel control pump assembly
b. Repair fuel control pump (para 3-
c. Fuel atomizer flow divider sticking
c. Repair fuel atomizer (para 3-71.
d. Remove and clean orificed fitting
6. Engine lacks ability to carry load.
a. Fuel filter partially clogged.
a. Replace filter elements as required
b. Control air lines leaking.
b. Tighten control air lines fittings
Fuel control failed.
or replace fuel control (para
7. Oil leaks from vent orifice of dual
Replace pump assembly on dual pad
pad gear box.
because of pump failure.
Test meter and if faulty, replace
9. DC ammeter out of limits.
10. DC ammeter does not indicate.
a. Damaged shunt.
b. Meter open.
a. Replace thermocouple (see TM 5-
does not indicate.
b. Open meter.
meter. (see TM 5-6115-586-12).
12. 60 Hz ammeter does not indicate
on either leg.
13. 60 Hz ammeter does not indicate
on one leg.