Section II. TROUBLESHOOTING - TM-5-3810-206-350020

Table 2-1. Special Tool (for Engine Model 687C-18-ES)

Table 2-4. Troubleshooting - TM-5-3810-206-350021

TM-5-3810-206-35 Crane-Shovel Basic Unit Crawler Mounted 40 Ton 2 Cu Yd Diesel Driven Manual
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TM 5-3810-206-35

Section II. TROUBLESHOOTING

2-4.

General

2-5.

Troubleshooting

This section will provide information useful in diagnosing

Malfunctions which may occur are listed in table 2-4.

and correcting unsatisfactory operation or failure of the

Each malfunction stated is followed by a list of probable

crane-shovel basic unit and its components.

causes of the trouble.

The corrective action

recommended is described opposite the probable cause.

Table 2-4. Troubleshooting

Malfunction

Probable cause

Corrective action

1. Engine fails to start ------------------------------

a. Blower rotors not revolving ------------

a. Repair or replace blower drive mech-

anism (para 3-14 or 3-15).

b. Poor compression ----------------------

b . Repair or replace valves (para 3-54

or 3-55).

c. Defective fuel injector pump-----------

c. Repair or replace pump (para 3-17

or 3-20).

d. Improper engine timing-----------------

d. Time engine (para 3-30 or 3-31).

e. Low starting rpm

e. Repair or replace starter motor (TM

5-3810-206-12).

f. Improper valve clearance -------------

f. Adjust valves (TM 5-3810-206-12).

g. Defective batteries can not turn

g. Charge or replace batteries (TM

engine.

5-3810-206-12).

2. Engine misses or vibrates excessively --------

a. Improper timing -------------------------

a. Adjust timing (para 3-30 or 3-31).

b. Defective injector pump----------------

b . Repair or replace the pump (para

3-17 or 3-20).

c. Defective governor ---------------------

c. Repair or replace the governor (para

3-9 or 3-10).

Governor out of adjustment -----------

d. Adjust (para 3-10).

Defective fuel injector ------------------

e. Replace (TM 5-3810-206-12).

3. Engine overheats --------------------------------

Injection pump incorrectly timed ------

a. Time (para 3-17 or 3-20).

Defective water pump ------------------

b . Repair or replace (para 3-25 or

3-26).

c. Defective thermostat -------------------

c. Replace (TM 5-3810-206-12).

d. Defective radiator ----------------------

d. Repair or replace (para 3-22 or

3-23).

4. Engine noisy--------------------------------------

Injection pump timed early ------------

a. Time (para 3-17 or 3-20).

Main bearings burned or worn --------

b. Replace (para 3-60 or 3-61).

Connecting rod bearings worn --------

c. Replace (para 3-57 or 3-58).

Improper valve clearance -------------

d. Adjust (TM 5-3810-206-12).

5. Oil consumption high ----------------------------

Worn piston rings -----------------------

a. Replace (para 3-57 or 3-58).

Oil seals worn---------------------------

b . Replace front and rear main bearings

oil seals (para 3-40 or 3-48).

6. Smoky exhaust-----------------------------------

Incorrect valve adjustment ------------

a. Adjust (TM 5-3810-206-12).

Worn piston rings -----------------------

b . Replace (para 3-57 or 3-58).

Defective fuel injector ------------------

c. Replace (TM 5-3810-206-12).

Injector pump incorrectly timed -------

d. Time (para 3-17 or 3-20).

Air cleaner clogged---------------------

e. Service air cleaner (TM 5-3810-

206-12).

f. Engine overloaded ---------------------

f. Lighten the load.

7. Low, or no oil pressure --------------------------

a. Oil pump defective ---------------------

a. Repair or replace (para 3-45 or

3-46).

b . Worn rod, or shaft bearings -----------

b . Replace (para 3-57 or 3-58 and

3-60 or 3-61).

8. Metallic knock under load-----------------------

Loose main bearings-------------------

a. Replace (para 3-60 or 3-61).

Incorrect valve adjustment ------------

b. Adjust (TM 5-3810-206-12).

Engine incorrectly timed ---------------

c. Time engine (para 3-30 or 3-31).

Defective piston(s) ---------------------

d. Replace (para 3-57 or 3-58).

9. Metallic knock when engine idles --------------

Loose main bearings-------------------

a. Replace (para 3-60 or 3-61).

Defective valve -------------------------

b. Replace (para 3-54 or 3-55).

Incorrect valve adjustment ------------

c. Adjust (TM 5-3810-206-12).

Engine incorrectly timed ---------------

d. Time (para 3-30 or 3-31).

10. Engine clutch grabs -----------------------------

Worn clutch plate-----------------------

a. Replace (para 3-7).

Defective linkage -----------------------

b . Repair or replace (TM 5-3810-206-

12).

2-6

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