User manual MTD HF1748

[. . . ] 6 Assembling Your Trimmer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Operating Your Trimmer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Maintaining Your Trimmer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Off-Season Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Release your hand from the throttle control, Figure 7. Allow the engine to cool down by idling. Put the ignition switch in the OFF (O) position, Figure 5. 9 HOLDING THE TRIMMER WARNING: Always wear eye, hearing, foot and body protection to reduce the risk of injury when operating this unit. Before using the unit, stand in the operating position, Figure 8. Check for the following: • The operator is wearing eye protection and proper clothing • With a slightly-bent right arm, the operator’s hand is holding the shaft grip • The operator’s left arm is straight, his hand holding the J-handle • The unit is at waist level • The cutting attachment is parallel to the ground and easily contacts the grass without the need to bend over For best results, tap the Bump Head™ on bare ground or hard soil. If line release is attempted in tall grass, the engine may stall. Always keep the trimming line fully extended. Line release becomes more difficult as the cutting line becomes shorter. NOTE: Do not rest the Bump Head™ on the ground while the unit is running. CAUTION: Do not remove or alter the line cutting blade assembly. Excessive line length will make the unit overheat. DO NOT attempt to perform this process yourself as engine damage may result from contaminants involved in the cleaning process for the port. MAINTENANCE SCHEDULE These required maintenance procedures should be performed at the frequency stated in the table. They should also be included as part of any seasonal tune-up. WARNING: To prevent serious injury, never perform maintenance or repairs with unit running. Always perform maintenance and repairs on a cool unit. Disconnect spark plug wire to ensure the unit will not start. FREQUENCY Before Starting Engine Every 10 Hours Every 25 Hours Every 50 Hours MAINTENANCE REQUIRED Fill fuel tank with correct oil and fuel mixture Clean and re-oil air filter Check and clean spark arrestor Check spark plug condition and gap Inspect exhaust port and spark arrestor screen for clogging or obstruction to assure maximum performance levels REFER TO Page 8 Page Page Page Page 13 15 14 15 LINE INSTALLATION This section covers both Split-Line™ and standard single line installation. Always use original equipment 2. 03 mm (0. 080 inch) replacement line. Line other than specified may make the engine overheat or fail. WARNING: Never use metal-reinforced line, wire or rope. These can break off and become dangerous projectiles. There are two methods to replace the trimming line: • Wind the inner reel with new line • Install a prewound inner reel Outer Spool Spring Inner Reel FIGURE 12 Winding the Existing Inner Reel 1. Hold the outer spool with one hand and unscrew the bump knob counterclockwise, Figure 11. Inspect the bolt inside the bump knob to make sure it moves freely. [. . . ] . Use starting procedure with choke lever in the RUN position Old or improperly mixed fuel . . Drain gas tank / Add fresh fuel mixture Fouled spark plug . . Replace or clean the spark plug ENGINE WILL NOT IDLE CAUSE ACTION Air Filter is plugged . . Replace or clean the air filter Old or improperly mixed fuel . [. . . ]