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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  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Centrifugal
Idle Speed RPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,800-3,600 rpm
Operating RPM  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6,100-7,300 rpm
Operating RPM  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6,100-9,800 rpm
Ignition Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electronic
Ignition Switch  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rocker Switch
Spark Plug Gap  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 mm (0.020 in.)
Lubrication  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fuel/Oil Mixture
Fuel/Oil Ratio  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32:1
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
Throttle Control  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Finger-Tip Trigger w/Lock-Out
Unit Weight (No fuel, with cutting head, cutting head guard and D-handle)  . . . . . . . . . . . . . . . . . . . . 6.69 kg (14.75 lbs.)
Cutting Mechanism  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-Tooth Cutting Blade, Dual String Cutting Head
Line Spool  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bump Line Releaser
Line Spool Diameter  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101.6 mm (4 inches)
Trimming Line Diameter  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.41 mm (0.095 inches)
Cutting Path Diameter  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45.7 cm (18 inches)
Cutting Path Diameter, Cutting Blade  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204 mm (8 inches)
Shoulder Harness  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Single Quick-Snap

Maximum Vibration Level (Idle)*  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.85 m/s2
Maximum Vibration Level (Racing)*  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.77 m/s2
Maximum Sound Power Level (Idle) ‡  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83.3 LweqdB(A)
Maximum Sound Power Level (Racing) ‡ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97.3 LweqdB(A)

* Method for obtaining level per ISO 7916

‡ Method for obtaining level per ISO 7917 

SECTION 8: SPECIFICATIONS

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Summary of Contents for Yard Machines LT31CS

Page 1: ...1CS 2 Cycle Petrol Trimmer Brushcutter IMPORTANT Read safety rules and instructions carefully before operating equipment MTD SOUTHWEST 550 N 54TH STREET CHANDLER ARIZONA 85226 2434 PRINTED IN U S A PA...

Page 2: ...ling 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 the model plate is very important if you need help fro...

Page 3: ...riginal equipment replacement line Never use metal reinforced line wire or rope etc These can break off and become a dangerous projectile Be aware of risk of injury to head hands and feet Clear the ar...

Page 4: ...es excessive grease or carbon build up WHILE OPERATING WITH CUTTING BLADE Read and understand all safety warnings before operating this unit Always use the shoulder harness when using the brush blade...

Page 5: ...arning 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...

Page 6: ...ir Filter Muffler Cover Spark Plug Muffler Cutting Head Guard Fuel Cap Throttle Control J Handle Cutting Head Gear Housing Shaft Grip On Off Stop Control Shaft Housing Starter Rope Grip Blade Shield G...

Page 7: ...ews through the top clamp and into middle clamp NOTE The holes in the top and middle clamp will line up only when assembled correctly 4 Place the clamps and the J handle over the shaft housing and ont...

Page 8: ...d guard before removing or installing the blade Remove the cutting head guard from the guard mount by removing the three 3 screws with a flat blade screwdriver Figure 7 Store parts for future use NOTE...

Page 9: ...t shaft Figure 10 Store the cutting head for future use NOTE The blade retainer under the cutting head will be used when installing the cutting blade Install the Cutting Blade WARNING To avoid serious...

Page 10: ...t or operate this unit with the locking rod in the locking rod slot WARNING Do not sharpen the cutting blade Sharpening the blade can cause the blade tip to break off while in use This can result in s...

Page 11: ...he instructions carefully for the proper fuel oil mixture NOTE Alcohol blended fuel absorbs moisture water As little as 1 moisture in the fuel can cause fuel and oil to separate and form acids when st...

Page 12: ...the fifth pull proceed to step 6 NOTE The engine will not run in the FULL choke A position 6 Place the choke lever in the PARTIAL choke B position Figure 17 7 Pull starter rope briskly 1 to 3 times t...

Page 13: ...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 it s being cut 13 FIGURE 19 FIGURE 20 HOLDING THE...

Page 14: ...e hearing foot body protection and the strap to reduce the risk of injury when operating this unit WARNING Do not use the cutting blade for edging or as an edger severe personal injury to yourself or...

Page 15: ...If you notice lost RPM poor performance or general lack of acceleration this service may be required If you feel your engine is need of this inspection refer service to an authorized servicing dealer...

Page 16: ...ne into the open hole in the inner reel and pull the line tight to make the loop as small as possible Figure 30 10 Before winding split the line back about 6 inches 11 Wind the line in tight even laye...

Page 17: ...or T20 Torx bit screwdriver 3 Pull the cover from the engine Do not force Choke Lever Screws Screws Partial Choke Position B FIGURE 33 Cleaning the Air Filter WARNING To avoid serious personal injury...

Page 18: ...the 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 t...

Page 19: ...bolts into muffler s front side Figure 40 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 20: ...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 21: ...tor adjustment 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 gas tank Add fresh fuel mixtu...

Page 22: ...ing Steel Throttle Control Finger Tip Trigger w Lock Out Unit Weight No fuel with cutting head cutting head guard and D handle 6 69 kg 14 75 lbs Cutting Mechanism 4 Tooth Cutting Blade Dual String Cut...

Page 23: ...SECTION 9 NOTES 23...

Page 24: ...OPERATOR S MANUAL PART NO 769 00304 8 02 PRINTED IN THE USA SECTION 9 NOTES Cont...

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