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15

SECTION 5: MAINTAINING YOUR TRIMMER

NOTE: Some maintenance procedures may require

special tools or skills. If you are unsure about
these procedures take your unit to an
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-up.

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

FREQUENCY

Before Starting Engine

Every 10 Hours

Every 25 Hours

Every 50 Hours

REFER TO

Page 11

Page 17

Page 19
Page 18

Page 19

WARNING: To prevent serious injury, perform
maintenance or repairs on a cool unit, never
with the unit running. Disconnect spark plug
wire to ensure the unit will not start.

NOTE: Emission control device and system repair,

maintenance or replacement 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 need of this
inspection, refer service to an authorized servicing dealer, or
establishment 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.

3. Remove spring from the inner reel, Figure 24.

4. Use a clean cloth to wipe the the inner reel, spring,

shaft and inner surface of the outer spool, Figure 25.

5. Check the indexing teeth on the inner reel and outer

spool for wear, Figure 26. If necessary, remove burrs
or replace the reel and spool. 

Inner Reel

Spring

Outer Spool

Bump Knob

Bolt

LINE INSTALLATION

This section covers both SplitLine™ and standard single
line installation.

Always use genuine 0.095 in. (2.41 mm) replacement
line. Line other than 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:

• Wind the inner reel with new line

• Install a prewound inner reel

Winding the Existing Inner Reel

1. Hold the outer spool with one hand and unscrew the

Bump Knob clockwise, Figure 24 . Inspect the bolt
inside the bump knob to make sure it moves freely.
Replace the bump knob if damaged.

2. Remove the inner reel from the outer spool, Figure 24.

Indexing Teeth

FIGURE 26

FIGURE 24

FIGURE 25

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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