Makita HTR4901, Instruction Manual

Page: 15 / 60

15
STORAGE
– When keeping the machine in storage for a long time, drain fuel from the fuel
tank and carburetor, as follows: Drain all fuel from the fuel tank.
– Remove the spark plug and add a few drops of oil into the spark plug hole.
Then, pull the starter gently to confirm that oil film covers the engine inside
and tighten the spark plug.
– Clear dirt or dust from the cutter blade and outside of engine, wipe them with
a oil-immersed cloth and keep the machine at a place as dry as possible.
MAINTENANCE SCHEDULE
General Engine assembly,
screws and nuts
Visual inspection for damage and tightness
Check for general condition and security
After each refuelling Throttle lever
Safety lock key
I-­O switch
Functional check
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
Inspection (cutting tool must not move)
Every 20 hours Gear case Supply of grease
Weekly Spark plug
Muffler
Inspection, replace if necessary
Check and if necessary clean the opening
Quarterly Suction head
Fuel tank To be replaced
To be cleaned
Shutting down procedure Fuel tank
Carburetor
Empty fuel tank
Operate until engine runs out of fuel
FAULT LOCATION
Fault System Observation Cause
Engine not starting or
under difficulties
Ignition system Ignition spark is present Faulty 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 Incorrect choke position, carburetor defective, suction head (gas
line filter) dirty, fuel supply line bent or interrupted
Compression Inside of engine Cylinder bottom gasket defective, crankshaft seals damaged,
cylinder or piston rings defective
Outside of engine Improper sealing of spark plug
Mechanical
fault Starter not engaging Broken starter spring, broken parts inside of the engine
Warm start problems Tank filled
Ignition spark existing Carburetor contaminated, have it cleaned
Engine starts but dies
immediately Fuel supply Tank filled Incorrect idling adjustment, suction head or carburetor
contaminated
Fuel tank vent defective, fuel supply line interrupted, cable or
I-­O switch faulty
Insufficient
performance
Several
systems may
simultaneously
be affected Engine idling Air filter contaminated, carburetor contaminated, muffler clogged,
exhaust duct in the cylinder clogged