Yard Machines MTD1640NAVCC Operator'S Manual Download

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5-3. RE-STARTING A WARM ENGINE

1. Make sure the on/off switch is in the “I” position.
2. Move the choke lever out as far as it will go. Then, push

the choke lever back in completely. This advances the
throttle so you do not have to hold trigger while starting.

3. Depress the primer bulb 10 times.
4. Pull the starter rope rapidly 4 times. The engine should

start.

5. Depress the safety latch and squeeze and release the

throttle trigger for idle.

5-4. TO STOP ENGINE

1. Release trigger and allow engine to return to idle

speed.

2. Press STOP switch down to stop engine Figure 5-4A.

NOTE:

For emergency stopping, simply activate CHAIN

BRAKE

and move STOP switch down.

INERTIA CHAIN BRAKE

ACTION :

NOTE:

THIS SAW IS EQUIPPED WITH AN INERTIA

CHAIN BRAKE.IF THE SAW KICKS BACK WHILE IN USE,
THE INERTIA OF THE MOVING SAW WILL ACTIVATE
THE BRAKE. A BRAKE BAND AROUND THE CLUTCH
DRUM ACTIVATES AND STOPS THE MOVING CHAIN.

5-5.CHAIN BRAKE

OPERATIONAL TEST

Test the CHAIN BRAKE

periodically to ensure proper

function.
Perform a CHAIN BRAKE

test prior to initial cutting, follow-

ing extensive cutting, and definitely following any CHAIN
BRAKE

service.

TEST CHAIN BRAKE

AS FOLLOWS:

1. Place saw on a clear, firm, flat surface.
2. Start engine.
3. Grasp the rear handle (A) with your right hand (Figure

5-5A).

4. With your left hand, hold the front handle (B) [not

CHAIN BRAKE

lever (C)] firmly (Figure 5-5A).

5. Squeeze the throttle trigger to 1/3 throttle, then imme-

diately activate the CHAIN BRAKE

lever (C) (Figure 5-

5A).

WARNING

Activate the CHAIN BRAKE

slowly and deliberately. Keep

the chain from touching anything; don’t let the saw tip for-
ward.
6. Chain should stop abruptly. When it does, immediately

release the throttle trigger.

WARNING

If chain does not stop, turn engine off and take your unit to
the nearest Authorized Service Center for service.
7. If CHAIN BRAKE

functions properly, turn the engine

off and return the CHAIN BRAKE

to the DISEN-

GAGED position.

5-6.SAW CHAIN / BAR LUBRICATION

Adequate lubrication of the saw chain is essential at all
times to minimize friction with the guide bar.
Never starve the bar and chain of oil. Running the saw with
too little oil will decrease cutting efficiency, shorten saw
chain life, cause rapid dulling of chain, and cause exces-
sive wear of bar from overheating. Too little oil is evidenced
by smoke, bar discoloration or pitch build-up.

NOTE:

Saw chain stretches during use, particularly when it

is new, and it will occasionally be necessary to adjust and
tighten it. New chain will require adjustment after about 5
minutes of operation.

5-7.AUTOMATIC OILER

Your chain saw is equipped with an automatic clutch driven
oiler system. The oiler automatically delivers the proper
amount of oil to the bar and chain. As the engine speed
increases, so does the oil flow to the bar pad. There is no
flow adjustment. The oil reservoir will run out at approxi-
mately the same time as the fuel supply runs out.

5 - OPERATING INSTRUCTIONS

5-5A

5-4A

6 - GENERAL CUTTING INSTRUCTIONS

6-1.FELLING

Felling is the term for cutting down a tree. Small trees up to
6-7 inches (15-18cm) in diameter are usually cut in a single
cut. Larger trees require notch cuts. Notch cuts determine
the direction the tree will fall.

FELLING A TREE:

WARNING

A retreat path (A) should be planned and cleared as nec-
essary before cuts are started. The retreat path should
extend back and diagonally to the rear of the expected line
of fall, as illustrated in Figure 6-1A.

CAUTION

If felling a tree on sloping ground, the chain saw operator
should keep on the uphill side of the terrain, as the tree is
likely to roll or slide downhill after it is felled.

NOTE:

Direction of fall (B) is controlled by the notching cut.

Before any cuts are made, consider the location of larger
branches and natural lean of the tree to determine the way
the tree will fall.

WARNING

Do not cut down a tree during high or changing winds or if
there is a danger to property. Consult a tree professional.
Do not cut down a tree if there is a danger of striking utility
wires; notify the utility company before making any cuts.

GENERAL GUIDELINES FOR FELLING
TREES:

Normally felling consists of 2 main cutting operations,
notching (C) and making the felling cut (D).
Start making the upper notch cut (C) on the side of the tree
facing the felling direction (E). Be sure you don t make the
lower cut too deep into the trunk.
The notch (C) should be deep enough to create a hinge (F)
of sufficient width and strength. The notch should be wide
enough to direct the fall of the tree for as long as possible.

WARNING

Never walk in front of a tree that has been notched.
Make the felling cut (D) from the other side of the tree and
1.5 - 2.0 inches (3-5 cm) above the edge of the notch (C)
(Figure 6-1B).
Never saw completely through the trunk. Always leave a
hinge. The hinge guides the tree. If the trunk is completely
cut through, control over the felling direction is lost.
Insert a wedge or felling lever in the cut well before the tree
becomes unstable and starts to move. This will prevent the
guidebar from binding in the felling cut if you have mis-
judged the falling direction. Make sure no bystanders have
entered the range of the falling tree before you push it over.

WARNING

Before making the final cut, always recheck the area for
bystanders, animals or obstacles.

FELLING CUT:

1. Use wooden or plastic wedges (G) to prevent binding

the bar or chain (H) in the cut. Wedges also control
felling (Figure 6-1C).

2. When diameter of wood being cut is greater than the

bar length, make 2 cuts as shown (Figure 6-1D).

WARNING

As the felling cut gets close to the hinge, the tree should
begin to fall. When tree begins to fall, remove saw from cut,
stop engine, put chain saw down, and leave area along
retreat path (Figure 6-1A).

6-1A

6-1B

6-1C

6-1D