4.19 1000-hour inspection and maintenance

4.191000-HOUR INSPECTION AND

MAINTENANCE

Thoroughly read and understand the section, “SAFETY PRECAUTIONS” of this MANUAL before operating or servicing the machine. Perform together with daily to 500-hour inspection and maintenance.

CAUTION

•The anti-freeze agent is inflammable and detrimental to human body. Keep away from flames and sparks. •Payattention not to adhere the anti-freeze agent on skin or enter into eye. If it adheres on skin or enters into eye, immediately wash skin or eye with lots of clean water, and ask a doctor to treat it.

A.REPLACEMENT OF COOLANT

WARNING

Danger of highly pressurized steam is generated in the radiator. While the coolant is kept at high temperature, do not loosen nor open the radiator cap. •When opening the radiator cap, stop the engine. •Allow sufficient time to cool down the engine before servicing.

Use of soft water with less impurities as base coolant. Use the “Long Life Coolant” mixing it in the coolant more than 30% of density to prevent the cooling line from corroding and freezing. The density of “Long Life Coolant” must correspond to the expected lowest ambient temperature. Refer to the section IV “LUBRICANT, FUEL & COOLANT SPECIFICATIONS”. Provide an empty container to receive the coolant drained. 1.Stop the engine. Open the engine guard.

Start the servicing with the coolant cooled down enough. 2.Loosen the radiator cap slowly. After ensuring that the pressure has been released, push the cap down and hold it down while turning to remove. 3.Discharge the coolant through the drain hose into the empty container. 4.After discharging, close the drain plug, and fix the hose to the original position. Then fill the cooling line with the mixture of water and cleaning solvent (radiator cleaner). 5.Operate the engine at a speed slightly faster than idling to raise the coolant temperature to 80˚C (176˚F) or more within white range on the thermometer for coolant temperature. Then, operate the engine for approximately 10 minutes. 6.Stop the engine and open the radiator drain cock. Flush the radiator with tap water until the water draining becomes clean.

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RADIATOR CAP

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CAP

DRAIN HOSE

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THROTTLE LEVER

7.Close the radiator drain cock. Fill the radiator with tap water in which LONG LIFE

COOLANT has been mixed (30% or more) up to the radiator cap. Rotate the engine for a while to fully release air from the cooling system. 8.Stop the engine. Check the coolant level (the reserve tank water level should be between

FULL and LOW). Refer to section III “PRE-

START INSPECTION”. Make sure level is to specifications. 9.After checking for leakage, close the engine guard.

RESERVE TANK

FULL LOW

NOTE: When the “Long Life Coolant” is not used, replace the coolant two times a year in spring and autumn.

NOTE: The following works require a professional skill because they are the inspection and maintenance inside the engine. Since the adjustment also requires special knowledge and skill, consult them with your Dealer.

B.CHECK AND ADJUSTMENT FOR VALVE

CLEARANCE

This is to correct the time lag on the operating timing of exhaust and intake valves.

Negligence for this service causes faults such as output shortage, improper exhaust gas color, noise and so on.

C.CHECK AND ADJUSTMENT FOR

STARTER AND GENERATOR (DYNAMO)

There is a possibility of warn-out brush and/or lack of grease lubrication on bearing.

This is of the adjustment to get good start ability and power generation.

D.CHECK AND ADJUSTMENT FOR FUEL

INJECTION TIMING

This is to adjust the fuel injection timing to optimize the engine performance.

E.CHECK AND ADJUSTMENT FOR

CONTACT SURFACE OF INTAKE AND

EXHAUST VALVE

This is to ensure the gas-tightness on the exhaust and intake valves to optimize the engine performance.

RADIATOR

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