Black Max BM25CSAC Operator's Manual page 14

 Cut one piece of trimmer line 16 ft. long. Insert the line
into the eyelet on the string head housing. Push until the
end of the line comes out the other side of the housing.
Pull the line until equal amounts of line appear on both
sides of the housing.
NOTE: Line may jam if more than 16 ft. is loaded.
 Rotate the bump knob clockwise to wind the line on the
spool until approximately 6 in. of line is showing on each
side.
 Push the bump knob down while pulling on line(s) to
manually advance the line.
CLEARING LINE JAM AND/OR REPLACING
BUMP KNOB
See Figures 14 - 15.
 Stop the engine and disconnect the spark plug wire.
 Depress the tabs on the side of the string head housing
to remove the lower string head housing.
NOTE: The housing is spring loaded and will self eject
when the tabs are depressed. It is not necessary to re-
move the upper string head housing from the drive shaft.
 Push the spool and bump knob through the string head
housing and remove the string from the spool.
 If replacing the bump knob, remove the old knob from
the spool. Align the knob ribs with the spool slots and
place the new bump knob onto the spool. If you are not
replacing the bump knob, skip this step.
 Insert the bump knob and spool assembly through the
opening in the string head housing.
 Align the slots on the lower string head housing with the
tabs on the upper string head housing.
 Push the housing together until the tabs snap into place.
NOTE: Hold the spool by the knob while completing the
installation.
 Install line as described in Line replacement.
CLEANING THE EXHAUST PORT, MUFFLER,
AND SPARK ARRESTOR
NOTICE:
The spark arrestor on this product has not been evalu-
ated by the USDA Forest Service and cannot be used on
U.S. forest lands. In addition, product users must comply
with Federal, State, and local fire prevention regulations.
Check with appropriate authorities. Contact customer
service or a qualified service center to purchase a re-
placement spark arrestor.
NOTE: Depending on the type of fuel used, the type and
amount of lubricant used, and/or your operating conditions, the
exhaust port, muffler, and/or spark arrestor screen may
become blocked with carbon deposits. If you notice a
power loss with your gas powered tool, you may need to
MAINTENANCE
remove these deposits to restore performance. We highly
recommend that only qualified service technicians perform
this service.
The spark arrestor must be cleaned or replaced every 50
hours or yearly to ensure proper performance of your prod-
uct. Spark arrestors may be in different locations depending
on the model purchased. Please contact your nearest service
dealer for the location of the spark arrestor for your model.
IDLE SPEED ADJUSTMENT
See Figure 16.
WARNING:
The cutting head will move when adjusting the idle speed.
Wear all protective clothing and keep all bystanders,
children, and pets at least 50 ft. away. Make adjustments
with the unit supported by hand so that the blade/cutting
head does not contact the ground or any object. Keep
all parts of your body away from the cutting head and
muffler. Failure to follow these instructions could result
in serious personal injury.
If the cutting attachment turns at idle, the idle speed screw
needs adjusting on the engine. Turn the idle speed screw
counterclockwise to reduce the idle RPM and stop the cut-
ting attachment movement. If the cutting attachment still
moves at idle speed, contact a service dealer for adjustment
and discontinue use until the repair is made.
WARNING:
The cutting attachment should never turn at idle. Turn
the idle speed screw counterclockwise to reduce the
idle RPM and stop the cutting attachment, or contact a
service dealer for adjustment and discontinue use until
the repair is made. Serious personal injury could result
from the cutting attachment turning at idle.
CLEANING THE AIR FILTER
See Figures 17 - 18.
For proper performance and long life, keep air filter clean.
 Remove the air filter cover by pushing down on the latches
while gently pulling off the cover.
 Remove the air filter.
 Clean the foam filter element with warm soapy water.
Rinse and let dry.
NOTE: If the foam filter element is damaged, it should be
replaced.
 Apply a light coat of engine oil to the foam filter element,
then squeeze it out.
 Reinstall the air filter.
NOTE: Make sure the filter is seated properly inside the
cover. Installing the filter incorrectly will allow dirt to enter
the engine, causing rapid engine wear.
Page 10 — English