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12

WARNING:

To prevent serious injury, never perform

maintenance or repairs while the unit is running. Always
allow the unit to cool before servicing or repairing the unit.
Disconnect the spark plug wire to prevent the unit from
starting accidentally.

MAINTENANCE

FREQUENCY

MAINTENANCE REQUIRED

Every 10 hours

Clean and re-oil the air filter. Refer to

Maintaining the Air Filter

.

After the first
10 hours and
at 38 hours

Change the oil. Refer to 

Changing the Oil

.

Have the rocker arm clearance checked by
an authorized service dealer.

Check the spark plug condition and gap.
Refer to 

Maintaining the Spark Plug

.

CHECKING THE OIL LEVEL

1. Stop the engine and allow it to cool.
2.

Set the unit on a flat, level surface

, such as a workbench or

table.

NOTE:

Failure to keep the engine level may cause the oil to overfill.

3. Clean the area around the oil fill plug (Fig. 11) to prevent debris

from entering the oil fill hole.

4. Unscrew the oil fill plug.
5. Look into the oil fill hole; use a flashlight if necessary. 

The oil

level should just touch the bottom thread of the oil fill hole

(Fig. 12). If the oil level is too low, add oil to the oil fill hole until
the oil level touches the bottom thread of the oil fill hole.

NOTE: DO NOT

overfill the crankcase.

6. Wipe up any oil that may have spilled.
7. Reinstall the oil fill plug.

NOTE:

Make sure the O-ring is in place on the oil fill plug (Fig. 11).

WARNING:

OVERFILLING THE CRANKCASE MAY

CAUSE SERIOUS PERSONAL INJURY. Check the oil level
before each use. The importance of maintaining the proper
oil level cannot be overemphasized.

Fig. 11

Oil Fill Plug

Oil Fill Hole

O-Ring

MAINTENANCE SCHEDULE

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 the unit to
an MTD authorized service dealer.

NOTE:

Maintenance, replacement, or repair of the emission control

devices and system may be performed by an MTD authorized
service dealer. 

NOTE:

Please read the California/EPA statement that came with the

unit for a complete listing of terms and coverage for the
emissions control devices, such as the spark arrestor, muffler,
carburetor, etc.

Fig. 12

Oil Fill Line

Summary of Contents for R4HB

Page 1: ...ved SERVICE IMPORTANT Read this manual thoroughly before using this product Follow all instructions DO NOT RETURN THIS UNIT TO THE RETAILER PROOF OF PURCHASE WILL BE REQUIRED FOR WARRANTY SERVICE For...

Page 2: ...ch materials Always stop the engine and allow it to cool before filling the tank Never remove the fuel tank cap or add fuel when the engine is hot Always loosen the fuel tank cap slowly to relieve any...

Page 3: ...other than the maintenance procedures described in this manual should be performed by an authorized service dealer Never remove modify or make inoperative any safety device furnished with the unit Bef...

Page 4: ...se clean fresh unleaded fuel OIL Refer to operator s manual for the proper type of oil DO NOT USE E85 FUEL IN THIS UNIT WARNING It has been proven that fuel containing greater than 10 ethanol will lik...

Page 5: ...e of printing We reserve the right to make changes at any time without notice Engine Type Air Cooled 4 Stroke Displacement 25 cc 1 52 cu in Spark Plug Gap 0 025 in 0 635 mm Spark Plug Champion QDZ4H o...

Page 6: ...wer blower tube clockwise until it locks into place Fig 2 Fig 1 Blower Outlet Upper Blower Tube Handle Fig 2 WARNING To avoid serious personal injury and damage to the unit shut the unit off before re...

Page 7: ...e 4 Unscrew the oil fill plug Fig 5 5 Pour the entire bottle into the oil fill hole Fig 5 DO NOT overfill Refer to Checking the Oil Level NOTE Never add oil to the fuel tank This unit has a four cycle...

Page 8: ...g a blended fuel Always use fresh unleaded gasoline Use the fuel additive STA BIL or an equivalent Drain the tank and run the engine dry before storing the unit Using Fuel Additives Use a fuel additiv...

Page 9: ...on 5 times Fig 8 8 DO NOT squeeze the throttle control Move the choke lever to Position 2 Fig 7 9 DO NOT squeeze the throttle control Pull the starter rope with a controlled and steady motion 3 to 5 t...

Page 10: ...the choke lever to Position 2 Fig 7 10 DO NOT squeeze the throttle control Run the electric start accessory in intervals no longer than 2 seconds each until the unit starts 11 DO NOT squeeze the thro...

Page 11: ...e at night when people might be disturbed Comply with times listed in local ordinances Usual recommendations are 9 00 a m to 5 00 p m Monday through Saturday To reduce noise levels operate the unit at...

Page 12: ...ead of the oil fill hole Fig 12 If the oil level is too low add oil to the oil fill hole until the oil level touches the bottom thread of the oil fill hole NOTE DO NOT overfill the crankcase 6 Wipe up...

Page 13: ...id serious personal injury always stop the engine and allow it to cool before cleaning or maintaining the unit Fig 15 Air Filter Air Filter Cover Lock Tab Backplate Tabs Slots CHANGING THE OIL Change...

Page 14: ...E SPEED NOTE Careless adjustments can seriously damage the unit An authorized service dealer should make carburetor adjustments If after checking the fuel and cleaning the air filter the engine still...

Page 15: ...roughly clean the unit and inspect it for any loose or damaged parts Repair or replace damaged parts and tighten loose screws nuts or bolts Preparing the Unit for Use after Long term Storage 1 Remove...

Page 16: ...Parts such as Blades Bump Knobs Outer Spools Cutting Line Inner Reels Starter Pulley Starter Ropes Drive Belts Saw Blades Guide Bars Cultivator Tines Tune ups Spark Plugs Carburettor Adjustments Filte...

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