MTD Yard Machines LT31CS Operator's Manual
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MTD Yard Machines LT31CS Operator's Manual

MTD Yard Machines LT31CS Operator's Manual

Mtd 2-cycle petrol trimmer, trimmer / brush cutter operator's manual
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Operator's Manual
LT31, LT31C
LT31CS
2-Cycle Petrol
Trimmer /
Trimmers
Brushcutter
IMPORTANT: Read safety rules and instructions carefully before operating equipment.
PRINTED IN U.S.A.
PART NO. 769-01389
(12/04)

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  • Page 1 Operator’s Manual LT31, LT31C LT31CS 2-Cycle Petrol Trimmer / Trimmers Brushcutter IMPORTANT: Read safety rules and instructions carefully before operating equipment. PRINTED IN U.S.A. PART NO. 769-01389 (12/04)

  • Page 2: Table Of Contents

    We reserve the right to make changes at any time without notice. Copyright© 2004 MTD SOUTHWEST INC, All Rights Reserved. SERVICE INFORMATION Service on this unit both within and after the warranty period should be performed only by an authorized and approved service dealer.

  • Page 3: Rules For Safe Operation

    • Squeeze the throttle control and check that it returns automatically to the idle position. Make all adjustments or repairs before using unit. Trimmer models LT31 & LT31C only: • was not designed to be used as a brushcutter. Do not attach or operate these units with any type of brushcutting blade or brushcutting attachment.

  • Page 4: While Operating

    Secure hair above shoulder level. • The cutting attachment shield must always be in place while operating the unit as a trimmer. Do not operate unit without both trimming lines extended, and the proper line installed. Do not extend the trimming line beyond the length of the shield.

  • Page 5: Other Safety Warnings

    RULES FOR SAFE OPERATION • Do not attempt to touch or stop the blade when it is rotating. • A coasting blade can cause injury while it continues to spin after the engine is stopped or the throttle trigger is released. Maintain proper control until the blade has completely stopped rotating.

  • Page 6: Safety And International Symbols

    WARNING: Thrown objects and rotating cutter can cause severe injury. Keep bystanders, especially children and pets, at least 15 meters (50 ft.) away from the cutting area. The cutting head guard must be used when using the trimmer cutting head. Bruscutters TRIMMER/...

  • Page 7: Know Your Unit

    Trimmer Model LT31 APPLICATIONS As a trimmer: • Cutting grass and light weeds • Edging • Decorative trimming around trees, fences, etc. On/Off Stop Control Shaft Tube Cutting Attachment KNOW YOUR UNIT Take the time to identify the configuration of your unit, which is either a LT31, LT31C or LT31CS.
  • Page 8 Control Air Filter/Muffler Spark Plug Cover Line Cutting Blade KNOW YOUR UNIT APPLICATIONS As a trimmer: • Cutting grass and light weeds • Edging • Decorative trimming around trees, fences, etc. On/Off Stop Control Starter Rope Grip Support Fitting D-Handle...
  • Page 9 Air Filter/Muffler Spark Plug Cover KNOW YOUR UNIT APPLICATIONS As a trimmer: • Cutting grass and light weeds • Edging • Decorative trimming around trees, fences, etc. As a brushcutter: • Cutting weeds and light bush of up to 1/2 inch in diameter...

  • Page 10: Assembly Instructions

    INSTALL AND ADJUST THE HANDLE Use the following information to install or adjust the handle onto your trimmer. Follow the instructions that apply to your type of handle. LT31: Small D-handle 1. Push the D-handle down onto the shaft housing so that the handle slants towards the shaft grip (Fig.
  • Page 11 Use only the instructions that apply to the type of shaft and shield that your unit is equipped with. WARNING: never operate the trimmer without the cutting attachment shield in place. LT31 1. Place the cutting attachment shield onto the shaft housing.

  • Page 12: Brushcutter Assembly Instructions

    Cutting Attachment Shield Install the cutting attachment shield when using the unit as a grass trimmer Support Fitting Install the cutting attachment shield on the shield mount by inserting the three (3) screws into the shield mount. Tighten securely with a flat blade screwdriver (Fig. 14).
  • Page 13 BRUSHCUTTER ASSEMBLY INSTRUCTIONS Remove the Cutting Attachment 1. Align the shaft bushing hole with the locking rod slot and insert the locking rod into the shaft bushing hole (Fig. 15). Shaft Bushing Hole Locking Rod Slot Locking Rod Fig. 15 2.
  • Page 14 Bushing Fig. 22 WARNING: T o avoid serious personal injury, the cutting attachment shield MUST be in place at all times while operating the unit as a trimmer. Clockwise...

  • Page 15: Oil And Petrol Information

    OIL AND PETROL INFORMATION OIL AND PETROL MIXING INSTRUCTIONS Old and/or improperly mixed fuel are the main reasons for the unit not running properly. Be sure to use fresh, clean unleaded petrol. Follow the instructions carefully for the proper petrol/oil mixture. Definition of Blended Petrols Today's petrols are often a blend of petrol and oxygenates such as ethanol, methanol, or MTBE (ether).

  • Page 16: Starting/Stopping Instructions

    Stop/Off (O) Throttle Lock-Out (LT31CS Only) LT31C & LT31CS Fig. 24 Position Position Blue Choke Lever Primer Bulb Fig. 25 Trimmer Equipped With Advanced Starting Technology™ Throttle Control (Squeeze during a standard start) Fig. 26 Start/On (I) Throttle Control Position...

  • Page 17: Holding The Trimmer

    • LT31CS: cut from left to right • LT31 & LT31C: cut from right to left • Slowly move the trimmer into and out of the cutting area at the desired height. Move either in a forward- backward or side-to-side motion. Cutting shorter lengths produces the best results.

  • Page 18: Decorative Trimming

    Before operating the unit with the cutting blade, stand in the operating position (Fig. 30). Refer to Holding the Trimmer. Cutting Blade Operating Tips To establish a rhythmic cutting procedure: • Plant feet firmly, comfortably apart.

  • Page 19: Maintenance And Repair Instructions

    Every 50 hours obstruction to assure maximum performance levels LINE INSTALLATION Your trimmer is equipped with one of three cutting attachments. Refer only to the section that applies to the type of cutting attachment that your unit is equipped with.
  • Page 20 MAINTENANCE AND REPAIR INSTRUCTIONS 3. Remove spring from the inner reel (Fig. 32). 4. Use a clean cloth to clean the the inner reel, spring, shaft, and inner surface of the outer spool. 5. Check the indexing teeth on the inner reel and outer spool for wear (Fig.

  • Page 21: Installing A Prewound Reel

    MAINTENANCE AND REPAIR INSTRUCTIONS NOTE: The spring must be assembled on the inner reel before reassembling the cutting attachment. 14. Hold the inner reel in place and install the bump knob by turning clockwise. Tighten securely. Fig. 39 INSTALLING A PREWOUND REEL 1.
  • Page 22 MAINTENANCE AND REPAIR INSTRUCTIONS 3. Pull old line out of the line loading and line locking holes (Fig. 41 and 42). 4. Insert a piece of trimming line straight into one of the two eyelets in the outer spool. Push it up through the line loading hole in the inner reel (Fig.

  • Page 23: Cleaning The Speedspool

    MAINTENANCE AND REPAIR INSTRUCTIONS 2. Pull the old inner reel with existing line from the outer spool. 3. Insert the ends of the prewound inner reel line into the outer spool eyelets (Fig. 47). Push the new inner reel, arrow side up, into the outer spool. Fig.
  • Page 24 MAINTENANCE AND REPAIR INSTRUCTIONS LT31CS LINE INSTALLATION: BUMP HEAD This section covers both SplitLine™ and standard single line installation. Always use original equipment manufacturer 2.41 mm (0.095 in) replacement line. Line other than the specified may make the engine overheat or fail. WARNING: chain or rope.
  • Page 25 MAINTENANCE AND REPAIR INSTRUCTIONS Fig. 56 SplitLine™ Installation 8. Take approximately 2.5 m (8 feet) of new trimming line. Insert one end of the line through one of the two holes in the inner reel (Fig. 57). Pull the line through the inner reel until only about 4 inches is left out.

  • Page 26: Air Filter Maintenance

    MAINTENANCE AND REPAIR INSTRUCTIONS AIR FILTER MAINTENANCE Removing the Air Filter/Muffler Cover WARNING: always turn your unit off and allow it to cool before you clean or service it. 1. Place the choke lever in Position 2 (Fig. 60). NOTE: The choke lever must be in Position 2 to remove the air filter/ muffler cover.

  • Page 27: Spark Arrestor Maintenance

    MAINTENANCE AND REPAIR INSTRUCTIONS SPARK ARRESTOR MAINTENANCE NOTE: The exhaust can only flow in one direction: AWAY from the engine. Pay close attention when disassembling the muffler so you can put it back together correctly. Failure to do so will damage the unit and may cause serious personal injury.

  • Page 28: Replacing The Spark Plug

    MAINTENANCE AND REPAIR INSTRUCTIONS Clean Air Filter The condition of the air filter is important to the operation of the unit. A dirty air filter will restrict air flow and change the air/fuel mixture. This is often mistaken for an out of adjustment carburetor.

  • Page 29: Long Term Storage

    To avoid serious WARNING: personal injury, always turn your trimmer off and allow it to cool before you clean or service it. Use a small brush to clean off the outside of the unit. Do not use strong detergents. Household cleaners that...

  • Page 30: Troubleshooting Chart

    ENGINE WILL NOT START C A U S E On/Off control in the OFF position Empty fuel tank Primer bulb wasn't pressed enough Engine is flooded Old or improperly mixed fuel Fouled spark plug Plugged spark arrestor The outside temperature is below 40º F The outside temperature is above 90º...

  • Page 31: Specifications

    ENGINE* Engine Type ..............Air-Cooled, 2-Cycle Stroke .
  • Page 32 NOTES...

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