Dolmar MS-261 U - Manual (Page 14)

14
MAINTENANCE SCHEDULE
TROUBLESHOOTING CHART
General Engine assembly, screws and nuts Visual inspection for damage and tightness.
Check for general condition and security.
After each refueling Control lever
I-O switch Functional check
Functional check
Daily Air filter
Cooling air duct
Cutting tool
Idling speed To be cleaned
To be cleaned
Check for damage and sharpness
Inspect (Cutting tool does not rotate)
Weekly Spark plug
Muffler Inspection, replace if necessary
Check and clean the opening if necessary
Quarterly Suction head
Fuel tank To be replace
To be cleaned
Yearly
(Long Term) Fuel tank
Carburetor Empty fuel tank
Operate until engine stops
Trouble System Observation Cause
Engine does not start or
hard to start Ignition system Ignition spark O.K. Failure in fuel supply or compression system, mechanical defect
No ignition spark I-O switch operated, wiring fault or short circuit, spark plug or
connector defective, ignition module faulty
Fuel supply Fuel tank filled Wrong choke position, defective carburetor, fuel supply line bent
or blocked, dirty fuel
Compression No compression when pulled over Cylinder bottom gasket defective, Crankshaft seals damaged,
Cylinder or piston rings defective or improper sealing of spark
plug
Mechanical fault Starter not engaging Broken starter spring, broken parts inside the engine
Warm start problem Tank filled
Ignition spark Carburetor contaminated or damaged. Clean or replace.
Engine starts but soon
stops Fuel supply Tank filled Incorrect idle-adjustment,
Carburetor contaminated
Defective tank, fuel supply line interrupted, cable or I-O switch
defective.
Insufficient performance Several systems Poor engine idling Air filter contaminated, carburetor contaminated, muffler
clogged, exhaust duct in the cylinder clogged