MTD YM75 manual Maintenance and Repair Instructions, Maintenance Schedule, Line Installation

SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS

Maintenance Schedule

Perform these required maintenance procedures at the frequency stated in the table. These procedures should also be a part of any seasonal tune-up.

NOTE: Some maintenance procedures may require special tools or skills. If you are unsure about these procedures take your unit to any non-road engine repair establishment, individual or authorized service dealer.

WARNING: To prevent serious injury, never perform maintenance or repairs with unit running. Always service and repair a cool unit. Disconnect the spark plug wire to ensure that the unit cannot start.

NOTE: Maintenance, replacement, or repair of the emission control devices and system may be performed by any non-road engine repair establishment, individual or authorized service dealer.

In order to assure peak performance of your engine, inspection of the engine exhaust port may be necessary after 50 hours of operation. If you notice lost RPM, poor performance or general lack of acceleration, this service may be required. If you feel your engine is in need of this inspection, refer service to any non-road engine repair establishment, individual or authorized service dealer for repair. DO NOT attempt to perform this process yourself as engine damage may result from contaminants involved in the cleaning process for the port.

FREQUENCY	MAINTENANCE REQUIRED	REFER TO
Before starting engine	Fill fuel tank with fresh fuel	Page 8
Every 10 hours	Clean and re-oil air filter	Page 15
Every 25 hours	Check and clean spark arrestor	Page 16
	Check spark plug condition and gap	Page 18
Every 50 hours	Inspect exhaust port and spark arrestor screen for clogging or	Page 16
	obstruction to assure maximum performance levels

Line Installation

Always use Genuine Factory Parts™ 0.080 in. (2.03 mm) replacement line. Using line other than the specified may make the engine overheat or fail.

WARNING: Never use metal-reinforced line, wire, chain or rope. These can break off and become dangerous projectiles.

There are two methods to replace the trimming line:

WARNING: Always use the correct line length when installing trimming line on the unit. The line may not release properly if the line is too long.

Top View Of The SpeedSpool®

Arrows

Outer Spool

• Wind the inner reel with new line

• Install a prewound inner reel

Winding the Inner Reel with New Line

NOTE: It is unnecessary to remove the bump knob to

	install new trimming line.
1.	Cut two pieces of 0.080 inch (2.03 mm) trimming line,	Inner Reel
	10 feet (3 m) long.
2.	Hold the outer spool and turn the inner reel	Bump Knob
	counterclockwise to line up the arrows on the outer

spool and inner reel. See Figure 15. Figure 15

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