WARNING: Before you begin using any attachment, read and understand the manual that came with the attachment. Follow all safety information contained within.
The
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.
WARNING: Always wear eye, hearing, foot and body protection to reduce the risk of injury when operating this unit.
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
• 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 |
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contacts the grass without the need to bend over | Fig. 14 |
| ADJUSTING TRIMMING LINE LENGTH |
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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.
WARNING: To avoid serious personal injury and damage to the unit, shut the unit off before removing or installing
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
CAUTION:
NOTE: Place the unit on the ground or on a work bench to make
1.Turn knob counterclockwise to loosen (Fig. 13).
2.While firmly holding the
NOTE: Aligning the release button with the guide recess will help installation (Fig. 11).
3.Turn the knob clockwise to tighten (Fig. 13).
CAUTION: Lock the release button in the primary hole and securely tighten the knob before operating this unit.
For edging (when using the line head cutting attachment with
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Guide Recess
Fig. 11
Primary Hole
Upper Shaft |
| Lower Shaft |
Housing |
| Housing |
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| Fig. 12 |
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90˚ Edging Hole |
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(Trimmer Only) |
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Knob
Fig. 13
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
• 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 TRIMMINGDecorative 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). |
| Fig. 16 |
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Perform these required maintenance procedures at the frequency stated in the table. These procedures should also be a part of any seasonal
NOTE: Some maintenance procedures may require special tools or skills. If you are unsure about these procedures take your unit to any
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.
NOTE: Maintenance, replacement, or repair of the emission control devices and system may be performed by any
| FREQUENCY | MAINTENANCE REQUIRED | SEE | |
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Before starting engine | Fill fuel tank with fresh fuel | p. 4 | |
Check oil | p. 6 | ||
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Every 10 hours | Clean and | p. 6 | |
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1st change at 10 hours | Change oil | p. 6 | |
Every 25 hours after | Clean spark arrestor | p. 7 | |
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10 hours on new engine | Check rocker arm to valve clearance and adjust | p. 6 | |
Every 25 hours | Check spark plug condition and gap | p. 7 | |
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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 OBSTRUCTIONSNOTE: 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).
Arrow | Cutting Head Knob |
Eyelet
Fig. 17
Fig. 18
Fig. 19
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