MC-44S 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 9 and 10) 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 9. ENGINE TROUBLESHOOTING
SYMPTOM | POSSIBLE PROBLEM | SOLUTION | |
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Difficult to start |
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| Ignition plug being bridge? | Check ignition system. | |
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Fuel is available but spark plug | Carbon deposit at ignition? | Clean or replace ignition. | |
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will not ignite. (Power available | Short circuit due to defective | Replace insulators. | |
at high tension cable). | |||
insulators? |
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| Improper spark gap? | Set spark plug gap to the correct gap. | |
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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 |
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available at high tension cable). | Ignition coil defective? | Replace ignition coil. | |
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| Muffler clogged with carbon | Clean or replace muffler. | |
| deposits? |
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Fuel is available and spark plug |
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Fuel in use inadequate (water, | Flush fuel sytem and replace with fresh fuel. | ||
ignites (compression normal). | |||
dust)? |
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| Air Cleaner clogged? | Clean or replace air cleaner. | |
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| Defective cylinder head gasket? | Tighten cylinder head bolts or replace head gasket. | |
Fuel is available and spark plug |
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Cylinder worn? | Replace cylinder. | ||
ignites (compression low ). | |||
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| Spark plug loose? | Tighen spark plug. | |
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Operation not satisfactory |
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| Air cleaner clogged? |
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Not enough power available | Air in fuel line? | Bleed (remove air) from fuel line. | |
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(compression normal, no miss- | Fuel level in carbureator float |
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firing). | Adjust carbureator float | ||
chamber improper? | |||
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| Carbon deposits in cylinder? | Clean or replace cylinder | |
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| Ignition coil defective? | Flush fuel sytem and replace with fresh fuel. | |
Not enough power available |
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Ignition plug often shorts? | Replace ignition wires, clean ignition. | ||
(compression normal, miss- | |||
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firing). | Fuel in use inadequate (water, | Flush fuel sytem and replace with fresh fuel. | |
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| dust)? |
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| Excessive carbon depostion in | Clean or replace crankcase. | |
| combustion chamber? |
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Engine overheats. | Exhaust or muffler clogged with | Clean or replace muffler. | |
| carbon. |
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| Spark plug heat value incorrect? | Replace spark plug with correct type spark plug. | |
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