* Owner's Manual‎ > ‎


Good maintenance is essential for safe, economical, and trouble-free
operation. It will also help reduce air pollution
Improperly maintaining this trimmer, or failure to correct a
problem before operation, can cause a malfunction in
which you can be seriously hurt or killed.
Always follow the inspection and maintenance
recommendations and schedules in this owner's manual.
To help you properly care for your trimmer, the following pages
include a maintenance schedule, routine inspection procedures, and
simple maintenance procedures using basic hand tools. Other service
tasks that are more difficult, or require special tools, are best handled
by professionals and are normally performed by a Esco technician
or other qualified mechanic.

The maintenance schedule applies to normal operating conditions. If
you operate your trimmer under severe conditions, such as sustained
high-load or high-temperature operation, or use it in unusually wet or
dusty conditions, consult your authorized Esco servicing dealer for
recommendations applicable to your individual needs and use.

Remember that your authorized Esco servicing dealer knows your
trimmer best and is fully equipped to maintain and repair it.
To ensure the best quality and reliability, use only new, Esco
Genuine Parts or their equivalents for repair and replacement.

Maintenance, replacement, or repair of the emission control
devices and systems may be performed by any engine repair
establishment or individual, using parts that are “certified” to
EPA standards.
Some of the most important safety precautions follow. However, we
cannot warn you of every conceivable hazard that can arise in
performing maintenance. Only you can decide whether or not you
should perform a given task.
Failure to properly follow maintenance instructions and
precautions can cause you to be seriously hurt or killed.
Always follow the procedures and precautions in the
owner's manual.
Safety Precautions
• Make sure the engine is off before you begin any maintenance or
repairs. This will eliminate several potential hazards:
Carbon monoxide poisoning from engine exhaust.
Be sure there is adequate ventilation whenever you operate the
Burns from hot parts.
Let the engine and exhaust system cool before touching.
Injury from moving parts.
Do not run the engine unless instructed to do so.
• Read the instructions before you begin, and make sure you have
the tools and skills required.
• To reduce the possibility of fire or explosion, be careful when
working around gasoline. Use only a nonflammable solvent, not
gasoline, to clean parts. Keep cigarettes, sparks, and flames away
from all fuel-related parts.

 Interval 1  Item
 Before each use  Check the engine oil 
Check the air cleaner 
Check the throttle cable 
Check the cutting attachment
Check the debris shield
Check/tighten nuts, bolts, and fasteners
Check the shoulder harness quick release
 First month or
10 hours
 Change the engine oil
 Every 3 months or
25 hours
 Clean the air filter element *2
 Every 6 months or
50 hours
Clean the air filter element * 2
Check/lubricate the drive cable *3
Lubricate the gear case *3
Check the clutch shoes and drum *3
Check the engine cooling fins
 Every year or 100
 Perform the 50-hour service items plus:
Check/adjust the idle speed *3
Check/adjust the valve clearance *3
Check/adjust the spark plug
Check the spark arrester
Check the fuel filter
Clean the fuel tank
 Every 2 years or
300 hours
 Perform the 100-hour service items plus:
Replace the spark plug 
Clean the combustion chamber *3
 Every 2 years  Check the fuel tubes and replace if necessary *3
Check the oil tube and replace if necessary *3
  *1. Log the hours of operation to determine the proper maintenance
  *2. Service more frequently when used in dusty areas.
  *3. These items should be serviced by an authorized Esco servicing
dealer unless you have the proper tools and are mechanically
proficient. Refer to the Esco shop manual for service procedures.
Failure to follow this maintenance schedule could result in
non-warrantable failures
Air Filter Check
Squeeze the air cleaner latch tabs, and remove the air cleaner cover.
Check the filter to be sure it is clean and in good condition.
If the filter is dirty, clean it as described under Air Filter Cleaning.
Replace the filter if it is damaged. Reinstall the filter and air cleaner
Operating the engine without an air filter, or with a damaged air filter,
will allow dirt to enter the engine, causing rapid engine wear. This type
of damage is not covered by the DISTRIBUTOR'S LIMITED

Air Filter Cleaning
A dirty air filter will restrict air flow to the carburetor, reducing engine
performance. If you operate the engine in very dusty areas, clean the
air filter more often than specified in the MAINTENANCE
1. Clean the air filter in warm soapy water, rinse, and allow to dry
thoroughly. Or clean in nonflammable solvent and allow to dry.
2. Dip the air filter in clean engine oil, then squeeze out all excess oil.
The engine will smoke when started if too much oil is left in the
3. Wipe dirt from the air cleaner base and cover using a moist rag. Be
careful to prevent dirt from entering the carburetor.
Throttle Cable Inspection
Verify the throttle trigger operates smoothly and the throttle cable is
undamaged. If there is visible damage, or if the throttle trigger does
not operate smoothly, have your authorized Esco servicing dealer
replace the throttle cable.
Check the free play at the end of the throttle cable.
Free play: 1/16 ~ 1/8 in (1.0 ~ 3.0 mm)
If adjustment is needed, use the following cable adjustment
Spark Plug Service
Recommended spark plug: CMR5HSB (NGK)
Incorrect spark plugs can cause engine damage.
1. Remove the  hex bolt and  cover.
2. Disconnect the spark plug cap, and remove any dirt from around
the spark plug area.
3. Remove the spark plug with a 5/8-inch spark plug wrench.
4. Inspect the spark plug. Replace it if the electrodes are worn, or if
the insulator is cracked or chipped.
5. Measure the spark plug electrode gap with a suitable gauge. The
gap should be
0.024 ~ 0.028 in (0.60 ~ 0.70 mm). Correct the gap, if necessary,
by carefully bending the side electrode.









0.024 ~ 0.028 in

(0.60 ~ 0.70 mm)


6. Install the spark plug carefully, by hand, to avoid cross-threading.
7. After the spark plug seats, tighten with a
5/8-inch spark plug wrench to compress
the washer.
If reinstalling the used spark plug, tighten
1/8 ~ 1/4 turn after the spark plug seats.
If installing a new spark plug, tighten 1/2 turn after the spark plug
A loose spark plug can overheat and damage the engine.
Overtightening the spark plug can damage the threads in the
cylinder head.
8. Attach the spark plug cap.
9. Install the cover and  bolt and tighten securely.


1. Remove the  bolt and  cover. Inspect the engine
cooling fins and clean out any dirt and debris.

2. Install the  cover and bolt, and then tighten securely.