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17

INSTALLING A PREWOUND REEL

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

bump knob clockwise, Figure 15. Inspect the bolt
inside the bump knob to make sure it moves freely.
Replace the bump knob if damaged.

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

3. Remove the spring from the old inner reel.

4. Place the spring in the new inner reel. 

NOTE: The spring must be assembled on the inner reel

before reassembling the cutting attachment.

5. Insert the ends of the line through the eyelets in the

outer spool, Figure 32. 

6. Place the new inner reel inside the outer spool. Push

the inner reel and outer spool together. While holding
the the reel and spool, grasp the ends and pull firmly
to release the line from the holding slots in the spool.

7. Hold the inner reel in place and install the bump

knob by turning counterclockwise. Tighten securely.

AIR FILTER MAINTENANCE

Removing the Air Filter/Muffler Cover

WARNING: To avoid serious personal injury,
always turn the unit off and allow it to cool
before you clean or perform any maintenance
on it.

1.

Place the choke lever in the PARTIAL choke 
position (B), Figure 33.

NOTE:

The choke lever must be in the PARTIAL 
choke position (B
) to remove the air 
filter/muffler cover, Figure 33.

2.

Remove the four (4) screws securing the air
filter/muffler cover, Figure 33. Use a flat blade 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,
always turn the unit off and allow it to cool before
you clean or perform any maintenance on it.

FIGURE 36

FIGURE 37

6. Replace the air filter in the air filter/muffler cover,

Figure 34.

NOTE:

Operating the unit without the air filter and air
filter/muffler cover assembly, will VOID the
warranty.

Reinstalling the Air filter/Muffler Cover

1.

Place the air filter/muffler cover over the back of the
carburetor and muffler.

NOTE:

The choke lever must be in the PARTIAL choke
position (B) 
to install the air filter/muffler cover,
Figure 21.

2.

Insert the four (4) screws into the holes in the air 
filter/muffler cover and tighten, Figure 33. Use a flat
blade or #T20 Torx bit screwdriver. Do not over-
tighten. Do not force. 

Air Filter

Inside Muffler

Cover

FIGURE 35

FIGURE 34

Clean and re-oil the air filter every 10 hours of operation.
It is an important item to maintain. Failure to maintain
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 34.

3.

Wash the filter in detergent and water, Figure 35.
Rinse the filter thoroughly. Squeeze out excess
water. Allow it to dry completely.

4.

Apply enough clean SAE 30 oil to lightly coat the 
filter, Figure 36.

5.

Squeeze the filter to spread and remove excess oil,
Figure 37.

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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