Troy-Bilt TB590 EC Operator's Manual page 7

OPERATING INSTRUCTIONS
trimming line fully extended. Line release becomes more difficult as the cutting
line becomes shorter.
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
• For best trimming results, operate unit at full throttle.
• Keep the cutting attachment parallel to the ground.
• Do not force the cutting attachment. 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.
• Cutting from right to 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 proper adherence of
explained trimming techniques, what vegetation is cut, and 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
attachment is at a 30° angle to the ground (Fig.
25).
USING THE CUTTING BLADE
WARNING:
Always wear eye, hearing, foot and body protection
to reduce the risk of injury when operating this unit.
WARNING:
Do not use the cutting blade for edging or as an
edger. Severe personal injury to yourself or others can result.
Before operating the unit with the cutting blade, stand in the operating
position (Fig. 26). Refer to Holding the Trimmer.
CUTTING BLADE OPERATING TIPS
To establish a rhythmic cutting procedure:
• Plant feet firmly, comfortably apart.
• Bring the engine to full throttle before entering the
material to be cut. At full throttle the blade has
maximum cutting power and is less likely to bind,
stall or cause blade thrust (which can result in
serious personal injury to the operator or others).
WARNING:
Blade thrust may occur when the spinning blade
contacts an object that it does not immediately cut. Blade thrust can be
violent enough to cause the unit and/or operator to be propelled in any
direction, and possibly lose control of the unit. Blade thrust can occur
without warning if the blade snags, stalls or binds. This is more likely to
occur in areas where it is difficult to see the material being cut.
• Cut while swinging the upper part of your body from left to right.
• Always release the throttle trigger and allow the engine to return to idle
speed when not cutting.
• When you are finished, always unsnap the unit from the harness before
taking off the harness.
WARNING:
The blade continues to spin after the engine is turned
off. The coasting blade can seriously cut you if accidentally touched.
• Swing the unit in the opposite direction as the blade spins, which increases
the cutting action.
• After the return swing, move forward to the next area to be cut plant your
feet again.
• The cutting blade is designed with a second cutting edge. You can use it by
removing the blade, turning it upside down, and reinstalling it.
To reduce the chance of material wrapping around
the blade, follow these steps:
• Cut at full throttle
• Swing the unit into material to be cut from
your left to your right (Fig. 27)
• Avoid the material just cut as you make the
return swing
MAINTENANCE AND REPAIR INSTRUCTIONS
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 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.
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,
Fig. 25
such as the spark arrestor, muffler, carburetor, etc.
FREQUENCY
Every 10 hours
Change 1st 10 hours
Every 25 hours
LINE INSTALLATION
This section covers both SplitLine™ and
standard single line installation.
Always use original equipment manufacturer
Fig. 26
0.105 in. (2.67 mm) replacement line. Other types
of line may make the engine overheat or fail.
There are two methods to replace the trimming
line:
• Wind the inner reel with new line
• Install a prewound inner reel
WINDING THE EXISTING INNER REEL
1. Hold the outer spool with one hand and
unscrew the Bump Knob clockwise (Fig. 28).
Inspect the bolt inside the bump knob to
make sure it moves freely. Replace the bump
knob if damaged.
2. Remove the inner reel from the outer spool
(Fig. 28).
3. Remove spring from the inner reel (Fig. 28).
4. Use a clean cloth to clean the the inner reel,
spring, shaft and inner surface of the outer
spool (Fig. 29).
5. Check the indexing teeth on the inner reel and
outer spool for wear (Fig. 30). If necessary,
remove burrs or replace the reel and spool.
NOTE: Always use the correct line length when
installing trimming line on the unit. The line
may not release properly if the line is too long.
OPERATING INSTRUCTIONS
WARNING:
Do not sharpen the cutting blade. Sharpening the
blade can cause the blade tip to break off while in use. This can result
in severe personal injury to yourself or others. Replace the blade.
WARNING:
Do not clear away any cut material with the engine
running or blade turning. To avoid serious personal injury, turn off
the engine. Allow the blade to stop before removing materials
wrapped around the blade shaft.
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.
MAINTENANCE REQUIRED
Clean and oil air filter
Change oil
Change oil
Check rocker arm to valve clearance and adjust
Check spark plug condition and gap
WARNING:
Never use metal-reinforced line, wire, chain or rope.
These can break off and become dangerous projectiles.
Fig. 27
SEE
p. 8
p. 8
p. 8
p. 9
p. 9
Outer
Spool
Spring
Inner Reel
Bolt
Bump Knob
Fig. 28
Fig. 29
Index Teeth
Fig. 30
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