Cleaning And Storage; Troubleshooting Chart; Specifications - MTD Pro MP425 Guia De Inicio Rapido

MAINTENANCE AND REPAIR INSTRUCTIONS
• the engine hesitates or stalls on acceleration
• there is a loss of engine power
Have the carburetor adjusted by an authorized service dealer.
ROCKER ARM CLEARANCE
WARNING:
To avoid serious personal injury, always turn the unit off and allow it to cool before you
clean or service it.
This service requires disassembly of the engine. If feeling unsure or unqualified to perform this service, take the unit to
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. 39).
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. 39).
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. 40). 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. 40).
• 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. 41). 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 41 and 42.
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. 42).
• 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 791-180852B or Champion #RDZ19H spark plug. The 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. 39).
2. Grasp the plug wire firmly and pull the cap from the spark plug.
WARNING: Do not sand blast, scrape or clean electrodes. Grit in the
engine could damage the cylinder.
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. 43).
5. Install a correctly-gapped spark plug in the cylinder head. Turn the 5/8 in. socket clockwise until snug.
If using a torque wrench torque to: 110-120 in.•lb. (12.3-13.5 N•m)
Do not over tighten.
SPARK ARRESTOR MAINTENANCE
1. Remove the rear engine cover. See Rocker Arm Clearance.
2. With a flat blade screwdriver or Torx T-20 bit and a T-25 bit, remove the screws
attaching the spark arrestor cover to the muffler (Fig. 44).
3. Pull the tab on the spark arrestor cover out of the muffler. Remove the spark
arrestor cover.
4. Remove the spark arrestor screen from the spark arrestor cover.
5. Clean the spark arrestor screen with a wire brush or replace it.
6. Reinstall the spark arrestor screen, spark arrestor cover and screws.
CLEANING
WARNING:
To avoid serious personal injury, always turn the unit off and allow it to cool before
cleaning or servicing it.
Use a small brush to clean off the outside of the unit. Do not use strong detergents. Household cleaners that contain
aromatic oils such as pine and lemon, and solvents such as kerosene, can damage plastic housing or handle. Wipe off
any moisture with a soft cloth.
STORAGE
• Never store the unit with fuel in the tank where fumes may reach an open flame or spark.
• Allow the engine to cool before storing.
• Lock up the unit to prevent unauthorized use or damage.
• Store the unit in a dry, well-ventilated area.
• Store the unit out of the reach of children.
LONG TERM STORAGE
1. Drain all gasoline from the gas tank into a container. Do not use gas that has been stored for more than 60 days.
Dispose of the old gasoline in accordance to Federal, State, and Local regulations.
2. Start the engine and allow it to run until it stalls. This ensures that all gasoline has been drained from the carburetor.
3. Allow the engine to cool. Remove the spark plug and put 5 drops of high quality motor oil into the cylinder. Pull the
starter rope slowly to distribute the oil. Reinstall the spark plug.
NOTE: Remove the spark plug and drain all of the oil from the cylinder before attempting to start the trimmer after
storage.
4. Change the oil, referring to Changing the Oil. Dispose of the old oil in accordance to Federal, State and Local
regulations.
5. Thoroughly clean the unit and inspect for any loose or damaged parts. Repair or replace damaged parts and
tighten loose screws, nuts or bolts. The unit is ready for storage.
TRANSPORTING
• Allow the engine to cool before transporting.
• Secure the unit while transporting.
• Drain the gas tank before transporting.
• Tighten gas cap before transporting.
View Of The Rear Engine Cover
Rocker Arm
Cover
Screws Screws
Spark
Plug Hole
T-25 Screws
Fig. 39
Adjustment
Nuts
Intake
Rocker
Arms
0.003–0.006 in.
(0.076–0.152 mm)
Exhaust
Fig. 41
0.025 in.
(0.635 mm.)
Muffler
Spark Arrestor Screen
Slot
T-20 Screw
ENGINE WILL NOT START
CAUSE
Empty fuel tank
Primer bulb wasn't pressed enough
Old fuel
Fouled spark plug
Plugged spark arrestor
ENGINE WILL NOT IDLE
CAUSE
Air filter is plugged
Old fuel
Improper carburetor adjustment
ENGINE WILL NOT ACCELERATE
CAUSE
Fig. 40
Old fuel
Cutting attachment bound with grass
Feeler
Dirty air filter
Gauge
Plugged spark arrestor
ENGINE LACKS POWER OR STALLS WHEN CUTTING
CAUSE
Old fuel
Valve Stem
Fouled spark plug
Plugged spark arrestor
Fig. 42
CUTTING ATTACHMENT WILL NOT ADVANCE LINE
CAUSE
Cutting attachment bound with grass
Cutting attachment out of line
Inner reel bound up
Cutting head dirty
Line welded
Line twisted when refilled
Not enough line is exposed
CUTTING LINE ADVANCES UNCONTROLLABLY
CAUSE
Oil, cleaner or lubricant in cutting head
If further assistance is required, contact an authorized service dealer.
ENGINE*
Engine Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air-Cooled, 4-Cycle
Displacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6 cu. in. (26.2 cc)
Operating RPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7,200+ rpm
Idle Speed RPM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,800 - 3,600 rpm
Ignition Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electronic
Ignition Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rocker Switch
Valve clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.003–0.006 in. (0.076–0.152 mm)
Spark Plug Gap. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.025 inch (0.655 mm)
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SAE 30 Oil
Crankcase Oil Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.04 oz (90 ml)
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Unleaded
Fig. 43
Carburetor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Diaphragm, All-Position
Starter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Auto Rewind
Muffler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Baffled with Guard
Throttle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Manual Spring Return
Fuel Tank Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 oz (532 ml)
DRIVE SHAFT AND CUTTING ATTACHMENT*
Diverter
Drive Shaft Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Steel Tube (EZ-Link™)
T-25
Throttle Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Finger-Tip Trigger
Screw
Total Approximate Unit Weight (without fuel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.5-13.0 lbs (5.2-5.9 kg)
Cutting Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bump Head™ w/SpeedLock™
Line Spool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bump Line Releaser
Fig. 44 Line Spool Diameter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 inches (101.6 mm)
Trimming Line Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.095 inches (2.41 mm)
Cutting Path Diameter, Trimmer Head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 inches (43.2 cm)
*All specifications are based on the latest product information available at the time of printing. We reserve the right to
make changes at any time without notice.
TROUBLESHOOTING
ACTION
Fill fuel tank with fuel
Press primer bulb fully and slowly 10 times
Drain gas tank and add fresh fuel
Replace or clean the spark plug
Clean or replace spark arrestor
ACTION
Replace or clean the air filter
Drain gas tank and add fresh fuel
Adjust according to the Carburetor Adjustments section
or take to an authorized service dealer for an
adjustment
ACTION
Drain gas tank and add fresh fuel
Stop the engine and clean the cutting attachment
Clean or replace the air filter
Clean or replace spark arrestor
ACTION
Drain gas tank and add fresh fuel
Replace or clean the spark plug
Clean or replace spark arrestor
ACTION
Stop the engine and clean cutting attachment
Refill with new line
Replace the inner reel
Clean inner reel and outer spool
Disassemble, remove the welded section and rewind
Disassemble and rewind the line
Push the bump head and pull out line until 4 inches
(102 mm) of line is outside of the cutting attachment
ACTION
Clean and thoroughly dry the cutting head

SPECIFICATIONS

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