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). 20