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OPERATING INSTRUCTIONS
OPERATING THE EZ-LINK™ SYSTEM
The EZ-Link™ system enables the use of these optional Add-Ons:
Mach 4
®
Trimmer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AF720
Hedge Trimmer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AH720
Brushcutter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BC720*
Blower/ Trimmer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BT720
Blower Vacuum. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BV720
Cultivator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GC720
Edger. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LE720
Pole Saw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PS720
Straight Shaft Trimmer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SS725
Snow Thrower. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ST720
Turbo Blower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TB720
*Do NOT use this attachment with an electric powered unit.
Removing the Cutting Attachment or Add-On
1. Turn the knob counterclockwise to loosen (Fig. 13).
2. Press and hold the release button (Fig. 11).
3. While firmly holding the upper shaft housing, pull the
cutting attachment or add-on straight out of the EZ-Link™
coupler (Fig. 12).
Installing the Cutting Attachment or Add-On
NOTE: Place the unit on the ground or on a work bench to
make add-on installation or removal easier.
1. Turn knob counterclockwise to loosen (Fig. 13).
2. While firmly holding the add-on, push it straight into the EZ-
Link™ coupler (Fig. 12).
NOTE: Aligning the release button with the guide recess will
help installation (Fig. 11).
3. Turn the knob clockwise to tighten (Fig. 13).
For edging (when using the line head cutting attachment with EZ-Link™
models), lock the release button of the cutting attachment into the 90°
edging hole (Fig. 13).
HOLDING THE TRIMMER
Before operating the unit, stand in the operating position (Fig. 14).
Check for the following:
• The operator is wearing eye protection and proper clothing
• With a slightly-bent right arm, the operator’s right hand is
holding the shaft grip
• The operator’s left arm is straight, the left hand holding the
assist handle
• The unit is at waist level
• The cutting attachment is parallel to the ground and easily
contacts the grass without the need to bend over
ADJUSTING TRIMMING LINE LENGTH
The Bump Head™ cutting attachment allows you to release
trimming line without stopping the engine. To release more line,
lightly tap the cutting attachment on the ground (Fig. 15) while
operating the trimmer at high speed.
NOTE: Always keep the trimming line fully extended. Line
release becomes more difficult as the cutting line
becomes shorter.
Each time the head is bumped, about 1 inch (25.4 mm) of trimming
line is released. A blade in the cutting attachment shield will cut
the line to the proper length if excess line is released.
For best results, tap the Bump Head™ on bare ground or hard
soil. If line release is attempted in tall grass, the engine may stall. Always keep the 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. 16).
WARNING:
Before you begin using any attachment, read and understand the manual
that came with the attachment. Follow all safety information contained within.
WARNING:
To avoid serious personal injury
and damage to the unit, shut the unit off before
removing or installing add-ons.
CAUTION:
Lock the release button in the
primary hole and securely tighten the knob
before operating this unit.
CAUTION:
Add-ons are to be used in the
primary hole only. Using the wrong hole could
lead to personal injury or damage to the unit.
WARNING:
Always wear eye, hearing, foot and body protection to reduce the risk of
injury when operating this unit.
WARNING:
Do not remove or alter the line cutting blade assembly. Excessive line
length will make the clutch overheat. This may lead to serious personal injury or damage
to the unit.
Guide Recess
Fig. 11
Release
Button
EZ-Link
™
Coupler
Upper Shaft
Housing
Fig. 12
Lower Shaft
Housing
Primary Hole
Knob
Fig. 13
90˚ Edging Hole
(Trimmer Only)
Fig. 14
Fig. 15
Fig. 16
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.
FREQUENCY MAINTENANCE REQUIRED SEE
Before starting engine
Fill fuel tank with fresh fuel
Check oil
p. 4
p. 6
Every 10 hours Clean and re-oil air filter p. 6
1st change at 10 hours
Every 25 hours after
Change oil
Clean spark arrestor
p. 6
p. 7
10 hours on new engine
Every 25 hours
Check rocker arm to valve clearance and adjust
Check spark plug condition and gap
p. 6
p. 7
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.
LINE INSTALLATION
Always use original equipment manufacturer 0.095 in. (2.41 mm)
replacement line. Other types of line may make the engine overheat or fail.
NOTE: There may be a need to remove the old line prior to
installing new line. If so, please refer to Removing the
old line or obstructions.
1. Align the arrows on the cutting head knob with the
outerspool eyelets, if they are not already.(Fig. 17)
2.
Using 10.5 ft. (3.2 m) of 0.095 in. (2.41 mm) replacement line push
an end of the line through one of the eyelets until it protrudes
through the opposite side. Continue pushing or pulling the line until
the line is evenly distributed, so approximately 5 ft. (1.5 m) is visible
from both sides of the cutting head.(Fig. 18)
3.
Hold the cutting head knob and turn the cutting head clockwise
to wind the line around the spool until 5 in. (12.7 cm) is
protruding from each side of the cutting head.(Fig. 19)
NOTE: If winding the line from a large spool of line, cut the line
from the spool so that it measures 5” from the eyelet.
4. Start the unit and bump the cutting head on the ground
until the desired cutting length is achieved.
REMOVING THE OLD LINE OR OBSTRUCTIONS
NOTE:
There should only be a need to remove the bump cap if
the old line gets jammed or an obstruction preventing the
new line from being installed properly.
1. Firmly press in on the tabs that are on each side of the
cutting head. (Fig. 20)
NOTE: It may be easier to press in and then up on one tab at
a time.
2. Remove the cap either by letting it pop off or a slight wiggle of
the cap may be required and pull it off the outer spool (Fig. 21)
3. Remove any old line from the inner reel or obstructions
from the outer spool. (Fig. 22)
4. Place the inner reel back into the outer spool (Fig. 21).
Fig. 18
Fig. 17
Fig. 19
Cutting Head Knob
Arrow
Eyelet