TM 5-3810-289-34
Chart 2-1. Troubleshooting
Malfunction
Probable cause
Corrective action
1. Engine fails to start.
a. Injectors clogged
a.
Replace injector (para 3-13)
b. Defective fuel pump
b.
Replace fuel pump (para 3-2)
2. Irregular firing of engine
a. Injectors defective
a.
Replace injector (para 3-13)
b. Piston rings worn
b.
Replace piston rings (para 3-43)
3. Engine smokes.
a.. Injector defective
a.
Replace injector (para 3-13)
b. Piston rings worn
b.
Replace piston ring (para 3-43)
4. Engine knocks excessively
a. Injectors defective
a.
Replace injectors (para 3-13)
b. Main bearings
b.
Replace plain hearings (para 3-44)
c. Connecting rod bearings
c.
Replace connecting rod hearing-
5. Low or no lubricating oil pressure
a. Loose bearings
a. Replace bearings (para 3-37)
indication.
b. Oil pump gear worn
b. Replace gears (para 3-37)
6. Starter will not crank engine.
Armature burned out.
Replace armature.
7. Alternator not charging.
Alternator inoperative.
Repair or replace alternate (para 3-1)
8. Alternator output low or unsteady.
Open or shorted silicon rectifier.
Replace rectifier (para 3-1)
9. Batteries will not hold charge.
Alternator regulator not operating
Refer to para 3-1.
properly.
Section III. GENERAL MAINTENANCE INSTRUCTIONS
demounting tools and should be used wherever it is
2-6. General
adaptable. Rest the bearing inner ring or both rings
This section contains general reference data and
(never the outer ring only) against a pair of flat blocks of
instructions for use by direct and general support
the same size and using a firm, stead pressure, force the
maintenance as authorized by the maintenance
shaft out.
allocation chart. It provides dimensions, tolerances,
(2) Keep the shaft straight to avoid drainage
wear limits, torque data, and miscellaneous information
from cocking.
required for maintenance of the crane-shovel.
(3) Where press is not adaptable, use a puller
2-7. Reference Data
of a type which can be inserted behind the bearing inner
a. Table 2-2 provides the following reference data:
race. Be sure that the jaws are set so that they will not
(1) Engine dimensions, tolerances, and wear
slip over the inner race when pressure is applied. Exert
limits.
an even pressure and pull straight.
(2) Crane dimensions, tolerances, and wear
(4) In cases where gears or other removable
limits.
parts do not allow the puller to contact the bearing
(3) Specific engine torque data.
directly, use the puller on the parts directly back of the
(4) General engine torque data.
bearing.
(5) Miscellaneous data.
(5) The use of a hammer is to be avoided
(6) Shovel dimensions, tolerances, and wear
unless other methods cannot be employed.
Split
limits.
sections of pipe or tubing, with welded lugs, can be used
b. Paragraph 2-8 contains general maintenance
for shafts of various sizes. Alternating blows on opposite
instructions for the crane-shovel upper and lower works
sides will prevent serious cocking. Be careful that pipe is
gears and bearings.
free of chips that would be shaken into the bearing. In
2-8. Maintenance of Gears and Bearings
removing a bearing by pounding, care must be observed
a. General. Every power transmitting part on the
not to hit or scrape locknut threads on the shaft.
crane-shovel revolving frame that is used in the work
(6) Cover bearings with cloth or paper as soon
cycle is mounted on anti-friction bearings. This includes
as they are removed.
Caution: Do not spin bearings before they
maintain concentricity, resulting in longer service life and
are clean. If bearings are spun, dirt can cause
lower maintenance.
scratch marks which may later lead to spilling.
c. Bearing Cleaning
Note. While the following instructions show ball
(1) Place bearings in a wire basket, so there is
bearings, the same procedure will apply to roller
plenty of space for-cleaner to reach all parts and
bearings.
b. Bearing Removal.
(1)
An arbor press is one of the best
2-3
