Section II. TROUBLESHOOTING

TM 5-6115-400-35

Direct and General Support and Depot

7. Specially Designed Tools and Equipment

There are no specially designed tools or equipment

Maintenance Repair Parts

required for repair or overhaul of the generator set.

Direct and General Support and Depot Maintenance

Repair Parts are listed and illustrated in Appendix II.

Section II. TROUBLESHOOTING

Probable cause

Probable remedy

8. General

head. The engine

This section provides information useful in

should be disassembled to

diagnosing and correcting unsatisfactory oper-

determine the cause and

ation or failure of the generator set or any of

the necessary parts

its components. Each trouble symptom stated

replaced.

is followed by a list of probable causes of

12.

Engine Overheats

trouble. The possible remedy recommended is

Probable cause

Probable remedy

described opposite the probable cause.

Improper engine lubrica- .....Check for proper

9. Engine Misses or Operates Erratically

tion. ................................. operation of engine

Probable cause

Probable remedy

........................................ oil pump (para 51).

Valve guides worn .............. Replace valve guides

........................................ (para 45).

13. Starter Will Not Crank Engine

Valve springs weak or .........Replace valve spring (para

Probable cause

Probable remedy

broken.............................. 45).

Starter brush springs ...........Check brush spring tension,

10. Engine Lacks Power

weak. ............................... replace springs if neces-

Probable cause

Probable remedy

........................................ sary (para 31).

Piston assemblies worn _---Replace piston assemblies

Starter commutator dirty......Polish commutator,

(para 57).

or worn............................. machine commutator

High engine temperature .....Repair or replace a

........................................ and under-cut mica if

caused by defective ......... defective water pump

........................................ necessary (para 31).

water pump. ..................... (par 36).

Starter armature shaft .........Replace worn bushings and

11. Engine Will Not Turn

bushings worn (arma-....... related items (para 31).

Probable cause

Probable remedy

ture drags on fields).

Engine is locked or ..............This can be due to

Starter armature burned ......Replace armature (para

extended

out. .................................. 31).

seized. ............................. idle or storage periods,

14. Starter Pinion Will Not Engage With Flywheel

or to improper prep-

Gear

aration of the engine

Probable cause

Probable remedy

for storage, in which

Grease and/or dirt in ...........Disassemble and clean the

case the parts may be

starter drive mechanism... drive assembly (para

rusted or corroded and

........................................ 31).

seized. Broken piston

Broken or excessively worn Replace broken or worn

rings, gears, etc., may

parts.

........... parts (para 31).

also cause locking. The

engine should be disas-

15. Main Generator Fails to Build Up Rated Voltage

sembled to determine

or Generator Output Voltage Too Low

the cause, and the

Probable cause

Probable remedy

necessary parts

Set operating below.............Adjust R18 (fig. 89-1)

replaced.

rated frequency. ............... frequency gain adjust.

Hydro-static lock ................This can be due to rain

........................................ Adjust (R1) frequency

........................................water entering

........................................ adjust. Refer to TM 5-

........................................uncovered

........................................ 6115-400-12.

........................................ exhaust pipe, leaking

Brush holders improperly ....Adjust brush holders

........................................ cylinder head gasket,

adjusted.

........(para 65).

........................................ cranked block or cylinder