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ENGINE*

Engine Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air-Cooled, 2-Cycle
Stroke  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31.75 mm (1.25 in.)
Displacement  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 cc (1.9 cu in.)
Clutch Type  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . None
Idle Speed RPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3,200-4,400 rpm
Operating RPM  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7,800+ rpm
Ignition Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electronic
Ignition Switch  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Slide Switch
Spark Plug Gap  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 mm (0.020 in.)
Lubrication  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Petrol/Oil Mixture
Petrol/Oil Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40:1
Carburetor  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Diaphragm, All-Position
Starter  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Auto Rewind
Muffler  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Baffled with Guard
Throttle  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Manual Spring Return
Fuel Tank Capacity  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 444 ml (15 oz)

DRIVE SHAFT and CUTTING HEAD*

Drive Shaft Housing  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Steel Tube
Throttle Control  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Finger-Tip Trigger
Approximate Unit Weight (No fuel, with cutting head, guard and D-handle)  . . . . . . . . . . . . . . . . . . . . . . 4.5 kg (10.5 lbs.)
Cutting Mechanism  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dual String Cutting Head
Line Spool  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bump Line Releaser
Line Spool Diameter  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76.2 mm (3 inches)
Trimming Line Diameter  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.03 mm (0.080 inches)
Cutting Path Diameter  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38.1 cm (15 inches)

Maximum Vibration Level (Idle)*  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.42 m/s2
Maximum Vibration Level (Racing)*  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.95 m/s2
Maximum Sound Pressure Level (Idle) ‡ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86.0 LpeqdB(A)
Maximum Sound Pressure Level (Racing) ‡  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101.0 LpeqdB(A)

* Method for obtaining level per ISO 7916

‡ Method for obtaining level per ISO 7917 

SECTION 8: SPECIFICATIONS

18

*All specifications are based on the latest product information available at the time of printing. We reserve the right to
make changes at any time without notice.

Summary of Contents for LT31

Page 1: ...Operator s Manual LT31 2 Cycle Petrol Trimmer IMPORTANT Read safety rules and instructions carefully before operating equipment PRINTED IN U S A PART NO 769 00828 9 03...

Page 2: ...and understand what it says Before you start assembling your new equipment please locate the model plate on the unit and copy the information from it to the space provided below The information on th...

Page 3: ...n result in personal injury to the operator and bystanders as well as damage to the unit Use only 2 03 mm 0 080 inch diameter original equipment replacement line Never use metal reinforced line wire o...

Page 4: ...ar housing or muffler These parts get extremely hot from operation When turned off they remain hot for a short time Do not operate the engine faster than the speed needed to cut trim or edge Do not ru...

Page 5: ...ng or caution May be used in conjunction with other symbols or pictographs WARNING READ OPERATOR S MANUAL Read the Operator s Manual s and follow all warnings and safety instructions Failure to do so...

Page 6: ...l D handle Cutting Head Shaft Grip Primer Bulb Choke Lever Air Filter Muffler Cover Spark Plug Shaft Tube Starter Rope Grip Line Cutting Blade Muffler Ignition Switch APPLICATIONS As a trimmer Cutting...

Page 7: ...he shaft tube so that the handle slants towards the shaft grip Figure 1 The squared bolt hole in the handle is to the right 2 Insert the shoulder bolt into the squared hole in the handle Place the was...

Page 8: ...a blended petrol or its use is unavoidable follow recommended precautions Always use fresh fuel mix per your operator s manual Always agitate the fuel mix before fueling the unit Drain the tank and r...

Page 9: ...starter rope briskly 5 times with the choke lever still in Position 1 6 Place the choke lever in Position 2 7 While squeezing the throttle control pull the starter rope briskly 1 to 3 times to start...

Page 10: ...n grass and weeds are dry The life of your cutting line is dependent upon Following the previous trimming techniques What vegetation is being cut Where vegetation is cut 10 FIGURE 8 FIGURE 9 HOLDING T...

Page 11: ...authorized service dealer 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...

Page 12: ...holding the inner reel and outer spool grasp the ends and pull firmly to release the line from the holding slots in the reel FIGURE 19 Eyelets Slotted Holes For Use with Split Line or Single Line For...

Page 13: ...in the air filter will VOID the warranty 1 Remove air filter muffler cover See Removing the Air filter Muffler Cover 2 Remove the air filter from behind the air filter muffler cover Figure 22 3 Wash t...

Page 14: ...air fuel mixture This is often mistaken for an out of adjustment carburetor Check the condition of the air filter before adjusting the idle speed screw Refer to Air Filter Maintenance Adjusting the I...

Page 15: ...bolts into muffler s front side Figure 28 8 Place muffler with exhaust gasket in place and bolts inserted against the engine aligning the bolt holes Tighten the bolts to secure muffler to the engine I...

Page 16: ...t of the reach of children LONG TERM STORAGE If the unit will be stored for an extended time 1 Drain all fuel from the fuel tank into a container Do not use fuel that has been stored for more than 60...

Page 17: ...Take to an authorized service dealer for carburetor adjustment ENGINE LACKS POWER OR STALLS WHEN UNDER LOAD CAUSE ACTION Old or improperly mixed fuel Drain fuel tank Add fresh fuel mixture Improper c...

Page 18: ...rigger Approximate Unit Weight No fuel with cutting head guard and D handle 4 5 kg 10 5 lbs Cutting Mechanism Dual String Cutting Head Line Spool Bump Line Releaser Line Spool Diameter 76 2 mm 3 inche...

Page 19: ...SECTION 9 NOTES 19...

Page 20: ...OPERATOR S MANUAL PART NO 769 00828 7 03 PRINTED IN THE USA SECTION 9 NOTES Cont...

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