TM 5-3810-207-20/TO 36C23-3-37-12
Section IV. TROUBLESHOOTING
21. General
This
section
provides
information
useful
in
diagnosing and correcting unsatisfactory operation or
failure of the crane-shovel and its components. Each
trouble symptom stated is followed by a list of probable
causes
of
the
trouble.
The
possible
remedy
recommended is described opposite the probable cause.
Any trouble beyond the scope of organizational
maintenance shall be reported to field maintenance, 3d
echelon.
22. Engine Lacks Power
Probable cause
Possible remedy
Air cleaner choked
Replace or repair air
cleaner (pars. 107 and
244).
Fuel pump clogged
Replace or repair fuel
pump (pars. 108 and
247).
Air in fuel system
Tighten all fuel line
connections. Replace
defective lines (pars.
110 and 250).
Faulty fuel
Drain and replace fuel.
23. Starting Motors Fail to Operate
Probable cause
Possible remedy
Poor electrical connection
Clean and tighten battery
cables and other elec-
trical connections.
Replace if necessary
(pars. 70 and 209).
Starter button defective
Replace button (pars. 79
and 210).
Faulty batteries
Replace batteries (pars. 70
and 209).
Faulty starter
Replace starter (pars. 78
and 204).
Starter brushes worn
Replace brushes (pars. 78
and 205).
24. Engines Fail to Start
Probable cause
Possible remedy
Improper valve clearance
Adjust valves (pars. 92
and 266).
Batteries too low to
Charge or replace batteries
turn over engine.
(pars. 70 and 209).
Defective starter
Replace starter (pars. 78
and 204).
Defective spark plugs
Replace spark plugs (pars.
76 and 202.)
Probable cause
Possible remedy
Carburetor out of
Adjust carburetor (TM 5-
adjustment.
3810-207-10).
Defective distributor
Replace distributor points
points.
(pars. 75 and 201).
Defective fuel pump
Replace fuel pump (pars.
108 and 247).
25. Engine Miss or Vibrate Excessively
Probable cause
Possible remedy
Faulty carburetor
Replace defective car-
buretor (pars. 106
and 246).
Governor out of adjust-
Adjust the governor (pars.
ment.
93 and 245).
Leaking fuel line
Replace defective fuel line
(pars. 110 and 250).
Faulty distributor
Replace distributor points
points.
(pars. 75 and 201).
Distributor not timed
Time distributor (pars. 75
properly.
and 201).
Defective spark plugs
Replace spark plugs (pars.
76 and 202).
Broken fan blade
Replace fan (par. 100).
26. Engines Stall Frequently
Probable cause
Possible remedy
Idling speed too low
Adjust idling speed to a
minimum of 600 rpm
(pars. 106 and 246).
Operating water tempera-
Replace thermostat (pars.
ture too low.
98 and 259).
Governor hunting
Correct governor adjust-
ment (pars. 93 and 245).
27. Engines Overheat
Probable cause
Possible remedy
Loose fan belt
Adjust fan belt (TM 5-
3810-207-10).
Defective thermostat
Replace thermostat (pars.
98 and 259).
Collapsed hose or loose
Check condition of hose.
hose connections.
Tighten hose connections.
Replace defective hose
(pars. 96 and 257).
Coolant low in radiator
Fill radiator with proper
coolant.
Insufficient oil in
Check oil level; fill as
crankcase.
necessary (LO 5-3810-
207-20).
Water pump and gener-
Adjust belt (TM 5-3810-
ator drive belt loose
207-10). Replace worn
or slip.
or damaged belt (pars.
100 and 254).
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