Multiquip MC94S manual MC94P/S Concrete Mixer Troubleshooting Engine, Engine Troubleshooting

MC94P/S CONCRETE MIXER — TROUBLESHOOTING (ENGINE)

Practically all breakdowns can be prevented by proper handling and maintenance inspections, but in the event of a breakdown, please take a remedial action following the

diagnosis based on the Troubleshooting (Tables 10 and 11) information shown below and on the next page. If the problem cannot be remedied, please leave the unit just as it is and consult our company's business office or service plant.

TABLE 10. ENGINE TROUBLESHOOTING

SYMPTOM	POSSIBLE PROBLEM	SOLUTION
Difficult to start
	Ignition plug being bridge?	Check ignition system.
Fuel is available but spark plug	Carbon deposit at ignition?	Clean or replace ignition.
will not ignite. (Power available	Short circuit due to defective	Replace insulators.
at high tension cable).
	insulators?
	Improper spark gap?	Set spark plug gap to the correct gap.
Fuel is available but spark plug	Short circuit at stop switch?	Check stop switch circuit. Replace stop switch if defective.
will not ignite. (Power NOT
available at high tension cable).	Ignition coil defective?	Replace ignition coil.
	Muffler clogged with carbon	Clean or replace muffler.
	deposits?
Fuel is available and spark plug
	Fuel in use inadequate (water,	Flush fuel sytem and replace with fresh fuel.
ignites (compression normal).
	dust)?
	Air Cleaner clogged?	Clean or replace air cleaner.
	Defective cylinder head gasket?	Tighten cylinder head bolts or replace head gasket.
Fuel is available and spark plug
	Cylinder worn?	Replace cylinder.
ignites (compression low ).
	Spark plug loose?	Tighen spark plug.
Operation not satisfactory
	Air cleaner clogged?
Not enough power available	Air in fuel line?	Bleed (remove air) from fuel line.
(compression normal, no miss-	Fuel level in carbureator float
firing).		Adjust carbureator float
	chamber improper?
	Carbon deposits in cylinder?	Clean or replace cylinder
	Ignition coil defective?	Flush fuel sytem and replace with fresh fuel.
Not enough power available
	Ignition plug often shorts?	Replace ignition wires, clean ignition.
(compression normal, miss-
firing).	Fuel in use inadequate (water,	Flush fuel sytem and replace with fresh fuel.
	dust)?
	Excessive carbon depostion in	Clean or replace crankcase.
	combustion chamber?
Engine overheats.	Exhaust or muffler clogged with	Clean or replace muffler.
	carbon.
	Spark plug heat value incorrect?	Replace spark plug with correct type spark plug.

PAGE 30 —MC94P/S CONCRETE MIXERS — OPERATION AND PARTS MANUAL — REV. #8 (03/06/09)