Maintenance & Repair Instructions - MTD Yard Machines Y26CS Manual Del Operador

OPERATING INSTRUCTIONS
NOTE: Do not rest the Bump Head™ on the ground while the unit is running.
Some line breakage will occur from:
• Entanglement with foreign matter
• Normal line fatigue
• Attempting to cut thick, stalky weeds
• Forcing the line into objects such as walls or fence posts
TIPS FOR BEST TRIMMING RESULTS
• Keep the cutting head parallel to the ground.
• Do not force the cutting head. Allow the tip of the line to do the cutting, especially along walls. Cutting with more
than the tip will reduce cutting efficiency and may overload the engine.
• Cut grass over 8 inches (200 mm) by working from top to bottom in small increments to avoid premature line wear
or engine drag.
• Cut from right to left whenever possible. Cutting to the left improves the unit's cutting efficiency. Clippings are thrown away
from the operator.
• Slowly move the trimmer into and out of the cutting area at the desired height. Move either in a forward-backward or
side-to-side motion. Cutting shorter lengths produces the best results.
• Trim only when grass and weeds are dry.
• The life of your cutting line is dependent upon:
• Following the trimming techniques
• What vegetation is being cut
• Where vegetation is cut
For example, the line will wear faster when trimming against a foundation wall as
opposed to trimming around a tree.
DECORATIVE TRIMMING
Decorative trimming is accomplished by removing all vegetation around trees, posts, fences and more.
Rotate the whole unit so that the cutting head is at a 30° angle to the ground (Fig. 16).
MAINTENANCE AND REPAIR INSTRUCTIONS
MAINTENANCE SCHEDULE
WARNING:
To prevent serious injury, never perform maintenance or repairs with unit running. Always
service and repair a cool unit. Disconnect the spark plug wire to ensure that the unit cannot start.
Perform these required maintenance procedures at the frequency stated in the table. These procedures should also be
a part of any seasonal tune-up.
NOTE: Some maintenance procedures may require special tools or skills. If you are unsure about these procedures
take your unit to any non-road engine repair establishment, individual or authorized service dealer.
NOTE: Maintenance, replacement, or repair of the emission control devices and system may be performed by any
non-road engine repair establishment, individual or authorized service dealer.
FREQUENCY MAINTENANCE REQUIRED
Fill fuel tank with fresh fuel
Before starting engine
Check oil
Every 10 hours Clean and re-oil air filter
1st change at 10 hours Change oil
25 hours after Clean spark arrestor
10 hours on new engine Check rocker arm to valve clearance and adjust
Every 25 hours Check spark plug condition and gap
LINE INSTALLATION
WARNING:
Never use metal-reinforced line, wire, chain or rope. These can break off and become
dangerous projectiles.
Always use original equipment manufacturer 0.095
in. (2.41 mm) replacement line. Other types of line
may make the engine overheat or fail.
NOTE: There may be a need to remove the old
line prior to installing new line. If so,
please refer to Removing the Old Line
or Obstructions.
1. Align the arrows on the cutting head knob with
the outerspool eyelets, if they are not
already.(Fig. 17)
2. Using 10.5 ft. (3.2 m) of 0.095 in. (2.41 mm)
replacement line push an end of the line through
one of the eyelets until it protrudes through the
opposite side. Continue pushing or pulling the
line until the line is evenly distributed, so
approximately 5 ft. (1.5 m) is visible from both
sides of the cutting head.(Fig. 18)
3. Hold the cutting head knob and turn the cutting
head clockwise to wind the line around the
spool until 5 in. (12.7 cm) is protruding from
each side of the cutting head.(Fig. 19)
NOTE: If winding the line from a large spool of
line, cut the line from the spool so that it
measures 5" from the eyelet.
4. Start the unit and bump the cutting head on the
ground until the desired cutting length is achieved.
REMOVING THE OLD LINE OR
OBSTRUCTIONS
NOTE: There should only be a need to remove
the bump cap if the old line gets jammed
or an obstruction preventing the new line from being installed properly.
1. Firmly press in on the tabs that are on each side of the cutting head. (Fig. 20)
NOTE: It may be easier to press in and then up on one tab at a time.
2. Remove the cap either by letting it pop off or a slight wiggle of the cap may be
required and pull it off the outer spool (Fig. 21)
3. Remove any old line from the inner reel or obstructions from the outer spool. (Fig. 22)
4. Place the inner reel back into the outer spool (Fig. 21).
NOTE: When placing the inner reel back into the outer spool, make sure the side
with the L is facing up towards the bump cap.
5. Replace the bump cap by aligning the tabs of the bump cap with the tab lock windows of the outer spool and press
down firmly until both tabs snap back into place. (Fig. 23)
To install new line, please refer to the Line Installation section.
CHECKING THE OIL LEVEL
WARNING:
To prevent extensive engine wear and damage to the unit, always maintain the proper oil
level in the crankcase. Never operate the unit with a low oil level.
The importance of checking and maintaining the proper oil level in the crankcase cannot be overemphasized. Check oil
before each use:
1. Stop the engine and allow oil to drain into the
crankcase.
2. Place the unit on a flat, level surface to get a
proper oil level reading (Fig. 27).
3. Keep dirt, grass clippings and other debris out
of the engine. Clean the area around the
dipstick before removing it.
4. Remove the oil fill plug/dipstick and wipe off oil.
Reinsert it all the way back in. (Fig. 25)
5. Remove the oil fill plug/ dipstick and check the oil level. Oil should be up to the top of the dipstick (Fig. 24).
6. If the level is low, add a small amount of oil to the oil fill hole and recheck (Fig. 25). Repeat this procedure until the
oil level reaches the top of the dipstick.
NOTE: Do not overfill the unit.
NOTE: Make sure the O-ring is in place on the oil fill plug/ dipstick when checking and changing the oil (Fig. 24).
CHANGING THE OIL
CAUTION:
Wear gloves to prevent injury when handling the unit.
For a new engine, change the oil after the first 10 hours of operation. Change the oil while the engine is still warm. The
oil will flow freely and carry away more impurities.
1. Unplug spark plug boot to prevent accidental starting.
2. Remove the oil fill plug/dipstick.
3. Pour the oil out of the oil fill hole and into a container by tipping the unit to a vertical position (Fig. 26). Allow ample
time for complete drainage.
4. Wipe up any oil residue on the unit and clean up any oil that may have spilled. Dispose of the oil according to
Federal, State and local regulations.
5. Refill the crankcase with 3.04 fl.oz. (90 ml) of SAE 30 SF, SG, SH oil.
4
Fig. 16
Cutting Head Knob
Arrow
Eyelet
Fig. 17 Fig. 18
Fig. 19 Fig. 20
Bump
Cap
UP
Inner
Reel
Spring
Outer
Spool
Fig. 21 Fig. 22
PRESS
Fig. 23
Oil Fill Plug/ Dipstick
Oil Fill
Plug
O-Ring
Full
Add 1.4-
1.5 oz.
O-Ring
(41-44 ml)
Oil Fill
Hole
Fig. 24 Fig. 25
MAINTENANCE AND REPAIR INSTRUCTIONS
NOTE: Use the bottle and spout saved from
initial use to measure the correct
amount of oil. The top of the label on
the bottle measures approximately 3.04
ounces (90 ml) (Fig. 28). Check the level
with the dipstick. If the level is low, add
a small amount of oil and recheck. Do
not overfill (Fig. 27).
6. Replace the oil fill plug/dipstick.
7. Reconnect the spark plug boot.
AIR FILTER MAINTENANCE
Cleaning the Air Filter
WARNING:
To avoid serious personal injury, always turn the unit off
and allow it to cool before you clean or service it.
Clean and re-oil the air filter every 10 hours of operation. It is an important item to
maintain. Failure to maintain your air filter properly can result in poor performance or
can cause permanent damage to your engine.
1. Open the air filter cover. Push the tab on the left
side of the cover inward. Then pull the air filter
cover out and to the right (Fig. 29).
NOTE: It may be necessary to remove the fuel cap
to completely remove the air filter cover.
2. Remove the air filter (Fig. 29).
3. Wash the filter in detergent and water (Fig. 30).
Rinse the filter thoroughly and allow it to dry.
4. Apply enough clean SAE 30 motor oil to lightly
coat the filter (Fig. 31).
5. Squeeze the filter to spread and remove excess
oil (Fig. 32).
6. Replace the filter (Fig. 29).
NOTE: If the unit is operated without the air
filter, you will VOID the warranty.
7. Reinstall the air filter cover. Position the hooks
on the right side of the air filter cover into the
slots at the right side of the back plate (Fig. 29).
NOTE: It may be necessary to remove the fuel
cap to completely replace the air filter
cover.
8. Swing the cover to the left until the tab on the air filter cover snaps into place in the slot on the back plate (Fig. 29).
9. Replace the fuel cap if you have removed it.
CARBURETOR ADJUSTMENT
WARNING:
The cutting attachment may spin during idle speed adjustments. Wear protective clothing
SEE
and observe all safety instructions to prevent serious personal injury.
p. 3
p. 4
The idle speed of the engine is adjustable. An idle adjustment screw is between the air filter cover and the engine
p. 4
starter housing (Fig. 33).
p. 4
NOTE: Careless adjustments can seriously damage your unit. An authorized service dealer should make carburetor
adjustments.
p. 5
Check Fuel
p. 4
Old fuel is usually the reason for improper unit performance. Drain and refill the tank with fresh fuel prior to making any
p. 4
adjustments. Refer to Oil and Fuel Information.
Clean Air Filter
The condition of the air filter is important to the operation of the unit. A dirty air filter will restrict
air flow. 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.
Adjust Idle Speed Screw
If, after checking the fuel and cleaning the air filter, the engine still will not idle, adjust
the idle speed screw as follows:
1. Start the engine and let it run at a high idle for a minute to warm up. Refer to
Starting/Stopping Instructions.
2. Release the throttle trigger and let the engine idle. If the engine stops, insert a
small Phillips screwdriver in between the Air Filter Cover and the Engine Cover
(Fig. 33). Turn the idle speed screw in, clockwise, 1/8 of a turn at a time (as needed) until the engine idles smoothly.
NOTE: The cutting attachment should not rotate when the engine idles.
3. If the cutting attachment rotates when the engine idles, turn the idle speed screw counterclockwise 1/8 of a turn at
a time (as needed), to reduce idle speed.
Checking the fuel, cleaning the air filter, and adjusting the idle speed should solve most engine problems. If not and all
of the following are true:
• the engine will not idle
• the engine hesitates or stalls on acceleration
Tab • there is a loss of engine power
Have the carburetor adjusted by an authorized service dealer.
ROCKER ARM CLEARANCE
This service requires disassembly of the engine. If feeling unsure or unqualified to perform this service, take the unit to
WARNING:
To avoid serious personal injury, always turn the unit off and allow it to cool before you
clean or service it.
an authorized service center.
NOTE: Inspect the valve to rocker arm clearance with a feeler gauge after the first 10 hours of operation and every
25 hours of operation.
• The engine must be cold when checking or
adjusting the valve clearance.
• This task should be performed inside, in a clean,
dust free area.
1. Remove the five (5) screws with a Flat-head or
T-20 Torx screwdriver and the one T-25 screw
(Fig. 34).
2. Disconnect the spark plug wire.
3. Clean dirt from around the spark plug. Remove
the spark plug from the cylinder head by
turning a 5/8 in. socket counterclockwise.
4. Remove the engine cover (Fig. 34).
5. Clean dirt from around the rocker arm cover.
Remove the screw holding the rocker arm
cover with a large flat blade screwdriver or Torx
T-25 bit (Fig. 35). Remove the rocker arm cover
and gasket.
6. Pull the starter rope slowly to bring the piston
to the top of its travel, (known as top dead center). Check that:
• The piston is at the top of its travel while looking in the spark plug hole (Fig. 35).
• Both rocker arms move freely, and both valves are closed.
If these statements are not true, repeat this step.
7. Slide the feeler gauge between the rocker arm and the valve return spring. Measure the clearance between the
valve stem and rocker arm (Fig. 36). Measure both the intake and exhaust valves.
The recommended clearance for both intake and exhaust is .003 – .006 in. (.076 – 0.152 mm). Use a standard
automotive .005 in. (0.127 mm) feeler gauge. The feeler gauge should slide between the rocker arm and valve stem
with a slight amount of resistance, without binding. See Figures 36 and 37.
8. If the clearance is not within specification:
a. Turn the adjusting nut using a 5/16 inch (8 mm) wrench or nut driver (Fig. 37).
• To increase clearance, turn the adjusting nut counterclockwise.
• To decrease clearance, turn the adjusting nut clockwise.
b. Recheck both clearances and adjust as necessary.
9. Reinstall the rocker arm cover using a new gasket. Torque the screw to 20–30 in•lb (2.2–3.4 N•m).
10. Check the spark plug and reinstall. See Replacing the Spark Plug.
11. Replace the spark plug wire.
12. Reinstall the engine cover. Check alignment of the cover before tightening the screws. Tighten screws.
REPLACING THE SPARK PLUG
Use a replacement part number 753-05784 or Champion #RDZ4H spark plug. The
WARNING: Do not sand blast, scrape or clean electrodes. Grit in the
engine could damage the cylinder.
correct air gap is 0.025 in. (0.635 mm.). Remove the plug after every 25 hours of
operation and check its condition.
1. Stop the engine and allow it to cool. Remove the five (5) screws with a Flat-head
or T-20 Torx screwdriver and the one T-25 screw (Fig. 34).
2. Grasp the plug wire firmly and pull the cap from the spark plug.
3. Clean dirt from around the spark plug. Remove the spark plug from the cylinder head by turning a 5/8 in. socket
counterclockwise.
4. Replace cracked, fouled or dirty spark plug. Set the air gap at 0.025 in. (0.635 mm.) using a feeler gauge (Fig. 38).
Fig. 27
Fig. 26
Fill Line
Air Filter
Air Filter Cover
Tab
Fig. 29 Fig. 30
Fig. 31 Fig. 32
Idle Adjustment Screw
View Of The Rear Engine Cover
Rocker Arm
Cover
Screws
Screws
Spark
Plug Hole
T-25 Screws
Fig. 34
Adjustment
Nuts
Intake
Rocker
Arms
0.003–0.006 in.
(0.076–0.152 mm)
Exhaust
Fig. 36
0.025 in.
(0.635 mm.)
Fig. 38
Fig. 28
Fig. 33
Fig. 35
Feeler
Gauge
Valve Stem
Fig. 37