MTD H70SS User Manual
Operator’s Manual
4-Cycle Gasoline Trimmer
Model H70SS
SAVE THESE INSTRUCTIONS
For a list of service providers, please refer to the phone numbers
found on page 6 or at the end of the Trouble Shooting section of
this manual.
DO NOT RETURN THE UNIT TO THE RETAILER. PROOF OF
PURCHASE WILL BE REQUIRED FOR WARRANTY SERVICE.
THIS PRODUCT IS COVERED BY ONE OR MORE U.S. PATENTS.
OTHER PATENTS PENDING.
Service on this unit both within and after the warranty period should
be performed only by an authorized and approved service dealer.
All information, illustrations, and specifications in this manual
are based on the latest product information available at the
time of printing. We reserve the right to make changes at any
time without notice.
Copyright© 2007 MTD SOUTHWEST INC, All Rights Reserved.
P/N 769-02747 (1/07)
TABLE OF CONTENTS
Service Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Rules for Safe Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Know Your Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Assembly Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Stopping Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Maintenance Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Cleaning and Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Troubleshooting Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . .Inside Back Cover
WARNING: When using the unit, you must follow
the safety rules. Please read these instructions
before operating the unit in order to ensure the
safety of the operator and any bystanders. Please
keep these instructions for later use.
READ ALL INSTRUCTIONS BEFORE OPERATING
• Read the instructions carefully. Be familiar with the controls
and proper use of the unit.
• This unit was not designed to be used as a brushcutter. Do
not attach or operate this unit with any type of brushcutting
blade or brushcutting attachment.
• Do not operate this unit when tired, ill, or under the influence
of alcohol, drugs, or medication.
• Children and teens under the age of 15 must not use the
unit, except for teens guided by an adult.
• All guards and safety attachments must be installed properly
before operating the unit.
• Inspect the unit before use. Replace damaged parts. Check
for fuel leaks. Make sure all fasteners are in place and secure.
Replace parts that are cracked, chipped, or damaged in any
way. Do not operate the unit with loose or damaged parts.
• Carefully inspect the area before starting the unit. Remove all
debris and hard or sharp objects such as glass, wire, etc.
• Be aware of the risk of injury to the head, hands and feet.
• Clear the area of children, bystanders, and pets. At a minimum,
keep all children, bystanders, and pets outside a 50 feet (15 m)
radius; there still may be a risk to bystanders from thrown
objects. Bystanders should be encouraged to wear eye
protection. If you are approached, stop the unit immediately.
• Use only 0.105 inches (2.67 mm) diameter original equipment
manufacturer replacement line. Never use metal-reinforced
line, wire, or rope. These can break off and become dangerous
projectiles.
• Squeeze the throttle control and check that it returns automatically to the idle position. Make all adjustments or repairs
before using unit.
RULES FOR SAFE OPERATION
• IMPORTANT SAFETY INSTRUCTIONS •
2
SAFETY WARNINGS FOR GAS UNITS
• Store fuel only in containers specifically designed and
approved for the storage of such materials.
• Avoid creating a source of ignition for spilled fuel. Do not
start the engine until fuel vapors dissipate.
• Always stop the engine and allow it to cool before filling the
fuel tank. Never remove the cap of the fuel tank, or add fuel,
when the engine is hot. Never operate the unit without the
fuel cap securely in place. Loosen the fuel tank cap slowly to
relieve any pressure in the tank.
• Add fuel in a clean, well-ventilated outdoor area where there
are no sparks or flames. Slowly remove the fuel cap only
after stopping engine. Do not smoke while fueling or mixing
fuel. Wipe up any spilled fuel from the unit immediately.
Always wipe unit dry before using.
• Move the unit at least 30 feet (9.1 m) from the fueling source
and site before starting the engine. Do not smoke or allow
sparks and open flames near the area while adding fuel or
operating the unit.
WHILE OPERATING
• Never start or run the unit inside a closed room or building.
Breathing exhaust fumes can be fatal. Operate this unit only
in a well-ventilated outdoor area.
• Wear safety glasses or goggles that meet ANSI Z87.1
standards and are marked as such. Wear ear/hearing
protection when operating this unit. Wear a face or dust
mask if the operation is dusty.
• Wear heavy long pants, boots, gloves and a long sleeve shirt.
Do not wear loose clothing, jewelry, short pants, sandals or
go barefoot. Secure hair above shoulder level.
• The cutting attachment shield must always be in place while
operating the unit as a trimmer. Do not operate unit without
both trimming lines extended, and the proper line installed.
Do not extend the trimming line beyond the length of the
shield.
• This unit has a clutch. The cutting attachment remains
stationary when the engine is idling. If it does not, have the
unit adjusted by an authorized service technician.
• Adjust the D-handle to your size in order to provide the best
grip.
• Be sure the cutting attachment is not in contact with anything
before starting the unit.
• Use the unit only in daylight or good artificial light.
• Avoid accidental starting. Be in the starting position
whenever pulling the starter rope. The operator and unit must
be in a stable position while starting. Refer to
Starting/Stopping Instructions.
RULES FOR SAFE OPERATION
• Use the right tool. Only use this tool for its intended purpose.
• Do not overreach. Always keep proper footing and balance.
• Always hold the unit with both hands when operating. Keep a
firm grip on both handles or grips.
• Keep hands, face, and feet at a distance from all moving
parts. Do not touch or try to stop the cutting attachment
when it rotates.
• Do not touch the engine, gear housing or muffler. These parts
get extremely hot from operation, even after the unit is turned off.
• Do not operate the engine faster than the speed needed to
cut, trim or edge. Do not run the engine at high speed when
not cutting.
• Always stop the engine when cutting is delayed or when
walking from one cutting location to another.
• If you strike or become entangled with a foreign object, stop
the engine immediately and check for damage. Do not
operate before repairing damage. Do not operate the unit
with loose or damaged parts.
• Stop the unit, switch the engine to off, and disconnect the
spark plug for maintenance or repair.
• Use only original equipment manufacturer replacement parts
and accessories for this unit. These are available from your
authorized service dealer. Use of any unauthorized parts or
accessories could lead to serious injury to the user, or
damage to the unit, and void your warranty.
• Keep unit clean of vegetation and other materials. They may
become lodged between the cutting attachment and shield.
• To reduce fire hazard, keep the engine and muffler free from
grass, leaves, and excessive grease.
AFTER USE
• Clean cutting blades with a household cleaner to remove any
gum buildup. Oil the blade with machine oil to prevent rust.
• Lock up and store the cutting blade in an appropriate area to
protect the blade from unauthorized use or damage.
OTHER SAFETY WARNINGS
• Never store a fueled unit inside a building where fumes may
reach an open flame or spark.
• Allow the engine to cool before storing or transporting. Be
sure to secure the unit while transporting.
• Store the unit in a dry area, locked up or up high to prevent
unauthorized use or damage, out of the reach of children.
• Never douse or squirt the unit with water or any other liquid.
Keep handles dry, clean and free from debris. Clean after
each use, see Cleaning and Storage instructions.
• Keep these instructions. Refer to them often and use them to
instruct other users. If you loan someone this unit, also loan
them these instructions.
SAVE THESE INSTRUCTIONS
WARNING: Gasoline is highly flammable, and its
vapors can explode if ignited. Take the following
precautions:
This operator's manual describes safety and international
symbols and pictographs that may appear on this product.
Read the operator's manual for complete safety, assembly,
operating and maintenance and repair information.
SYMBOL MEANING
• SAFETY ALERT SYMBOL
Indicates danger, warning or caution. May be
used in conjunction with other symbols or
pictographs.
• WARNING - READ OPERATOR'S MANUAL
Read the operator’s manual(s) and follow all
warnings and safety instructions. Failure to do so
can result in serious injury to the operator and/or
bystanders.
• WEAR EYE AND HEARING PROTECTION
WARNING: Thrown objects and loud noise can
cause severe eye injury and hearing loss. Wear
eye protection meeting ANSI Z87.1 standards
and ear protection when operating this unit. Use
a full face shield when needed.
• ON/OFF STOP CONTROL
ON / START / RUN
• ON/OFF STOP CONTROL
OFF or STOP
• KEEP BYSTANDERS AWAY
WARNING: Keep all bystanders, especially
children and pets, at least 50 feet (15 m) from the
operating area.
• THROWN OBJECTS AND ROTATING CUTTER
CAN CAUSE SEVERE INJURY
WARNING: Do not operate without the cutting
attachment shield in place. Keep away from the
rotating cutting attachment.
• SHARP BLADE
WARNING: Sharp blade on cutting attachment
shield. To prevent serious injury, do not touch the
line cutting blade.
APPLICATIONS
• Cutting grass and light weeds
• Edging
• Decorative trimming around trees, fences, etc.
NOTE: The below illustration may differ slightly from your unit.
For example, the picture shows a straight shaft. Your
unit may have a curved shaft.
Cutting Attachment
Shield
Throttle
Control
D-Handle
Cutting
Attachment
Shaft Grip
Shaft
Housing
Line
Cutting
Blade
On/Off Stop Control
KNOW YOUR UNIT
3
HOLDING THE TRIMMER
Before operating the unit, stand in the
operating position (Fig. 3). 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 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. 4) while
operating the trimmer at high
speed.
NOTE: Always keep the trimming line fully extended. Line
release becomes more difficult as cutting line becomes
shorter.
Each time the head is bumped, about 1 inch (25.4 mm) of
trimming line releases. A blade in the cutting attachment shield
will cut the line to the proper length if any excess line is released.
For best results, tap the bump knob on bare ground or hard
soil. If you attempt a line release in tall grass, the engine may
stall. Always keep the trimming line fully extended. Line release
becomes more difficult when the cutting line gets 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.
Fig. 3
WARNING: Always wear eye, hearing, foot and
body protection to reduce the risk of injury when
operating this unit.
OPERATING INSTRUCTIONS
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.
Fig. 4
4
ASSEMBLY INSTRUCTIONS
INSTALLING AND ADJUSTING THE D-HANDLE
If your unit has the D-Handle pre-installed, please follow the
“To Adjust” instructions only.
To Install
1. Remove the screws and
bottom clamp piece that
were installed on the Dhandle for shipping.
2. Place the D-handle over
the shaft housing and onto
the bottom clamp (Fig. 1).
Place it a minimum of 6 in
(15.24 cm) from the end of
the shaft grip.
3. Start screws with a large Flat-head or T-25 Torx
screwdriver. Do not tighten until you make the handle
adjustment.
To Adjust
4. If the D-handle was pre-installed, loosen the screws on the
handle just enough to move it.
5. While holding the unit in the operating position, manuever
the D-handle to the location that provides you the best grip
(Fig. 3).
6. Tighten the clamp screws evenly, until the D-handle is
secure.
(4) Screws
D-Handle
Bottom
Clamp
Fig. 1
Minimum
6 inches
(15.24 cm)
STOPPING INSTRUCTIONS
Note: This unit has a Momentary Switch. The On/Off Contol
Switch will be in the On position at all times.
1. Release your hand from the throttle control. Allow the
engine to cool down by idling.
2. Press the On/Off Stop Control in the OFF (O) position and
hold until the unit completely stops running. (Fig. 2)
STOPPING INSTRUCTIONS
Start/On ( I )
Stop/Off (O)
Throttle
Control
Fig. 2
• Cut from left to right.
• 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
- Where vegetation is cut
For example, the line will wear faster when trimming against a
foundation wall as opposed to trimming around a tree. It is
normal for some line breakage to occur from regular use.
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. 5).
9. Wind the line in tight even layers in the direction indicated
on the inner reel. (Fig. 10)
NOTE: Failure to wind the line in the direction indicated will
cause the cutting attachment to operate incorrectly.
10. Insert the ends of the line into the two holding slots (Fig. 11).
11. Insert the ends of the line through the eyelets in the outer
spool and place inner reel with spring inside the outer spool
(Fig. 12). Push the inner reel and outer spool together.
While holding the inner reel and outer spool, grasp the ends
and pull firmly to release the line from the holding slots in
the reel.
NOTE: The spring must be assembled on the inner reel before
reassembling the cutting attachment.
12. Hold the inner reel in place and install the Bump Knob by
turning counterclockwise. Tighten securely.
MAINTENANCE AND REPAIR INSTRUCTIONS
6
Installing a Pre Wound Reel
1. Hold the outer spool with one hand and unscrew the Bump
Knob clockwise (Fig. 6). Inspect the bolt inside the Bump
Knob to make sure it moves freely. Replace the Bump
Knob if damaged.
2. Remove the old inner reel from the outer spool
(Fig. 6).
3. Remove the spring from the old inner reel
(Fig. 6).
4. Place the spring in the new inner reel.
NOTE: The spring must be assembled on the inner reel before
reassembling the cutting attachment.
5. Insert the ends of the line through the eyelets in the outer
spool (Fig. 12).
6. Place the new inner reel inside the outer spool. Push the
inner reel and outer spool together. While holding the inner
reel and outer spool, grasp the ends and pull firmly to
release the line from the holding slots in the spool.
7. Hold the inner reel in place and install the Bump Knob by
turning counterclockwise. Tighten securely.
Replacement Parts
For replacement parts, refer to the Accessories / Replacement
Parts section.
Storage
• Store the unit locked up to prevent unauthorized use or
damage.
• Store the unit in a dry, well-ventilated area.
• Store the unit out of the reach of children.
Long Term Storage
If the unit will be stored for an extended time, use the following
storage procedure:
1. Thoroughly clean the unit and inspect it for any loose or
damaged parts. Repair or replace damaged parts and
tighten loose screws, nuts or bolts. The unit is ready for
storage.
Transporting
• Secure the unit while transporting.
Accessories / Replacement Parts
Replacement Line Cartridge 753-1160
Inner Reel Spring 610636
Bump Head Knob Assembly 180814
Shoulder Strap 682075
Fig. 10
Loop
Fig. 9
Holding Slots
Fig. 11
TROUBLESHOOTING
CAUSE ACTION
Cutting attachment bound with grass Stop the engine and clean cutting attachment
Cutting attachment out of line Refill with new line
Inner reel bound up Replace the inner reel
Cutting head dirty Clean inner reel and outer spool
Line welded Disassemble, remove the welded section and rewind
Line twisted when refilled Disassemble and rewind the line
Not enough line is exposed Push the bump knob and pull out line until 4 inches
(102 mm) of line is outside of the cutting attachment
CUTTING ATTACHMENT WILL NOT ADVANCE LINE
CAUSE ACTION
Oil, cleaner or lubricant in cutting head Clean and thoroughly dry the cutting head
CUTTING LINE ADVANCES UNCONTROLLABLY
Drive Shaft Housing ........................................................................................................................................................... Aluminum Tube
Throttle Control............................................................................................................................. Finger-Tip Trigger w/Momentary Switch
Approximate Unit Weight (No fuel, with cutting attachment, shield and D-handle)............................................................ 13 lbs. (5.9 kg)
Cutting Mechanism.............................................................................................................................................. Dual String Cutting Head
Line Spool.................................................................................................................................................................... Bump Line Releaser
Line Spool Diameter................................................................................................................................................... 4 inches (101.6 mm)
Trimming Line Diameter......................................................................................................................................... 0.105 inches (2.67 mm)
Cutting Path Diameter ............................................................................................................................................... 17 inches (43.18 cm)
SPECIFICATIONS
DRIVE SHAFT AND CUTTING ATTACHMENT*
7
For engine service and warranty please call 1-800-426-7701
to locate the closest service dealer in your area.
For boom service and warranty please call 1-800-800-7310
MANUFACTURER’S LIMITED WARRANTY FOR:
No implied warranty, including any implied warranty of
merchantability or fitness for a particular purpose, applies
after the applicable period of express written warranty above
as to the parts as identified. No other express warranty or
guaranty, whether written or oral, except as mentioned
above, given by any person or entity, including a dealer or
retailer, with respect to any product shall bind MTD Pro LLC
During the period of the Warranty, the exclusive remedy is
repair or replacement of the product as set forth above.
(Some states do not allow limitations on how long an implied
warranty lasts, so the above limitation may not apply to you.)
The provisions as set forth in this Warranty provide the sole
and exclusive remedy arising from the sales. MTD Pro LLC
shall not be liable for incidental or consequential loss or
damages including, without limitation, expenses incurred for
substitute or replacement lawn care services, for
transportation or for related expenses, or for rental
expenses to temporarily replace a warranted product. (Some
states do not allow limitations on how long an implied warranty
lasts, so the above limitation may not apply to you.)
In no event shall recovery of any kind be greater than the amount
of the purchase price of the product sold. Alteration of the safety
features of the product shall void this Warranty. You assume the
risk and liability for loss, damage, or injury to you and your
property and/or to others and their property arising out of the
use or misuse or inability to use the product.
This limited warranty shall not extend to anyone other than the
original purchaser, original lessee or the person for whom it was
purchased as a gift.
How State Law Relates to this Warranty: This warranty gives
you specific legal rights, and you may also have other rights
which vary from state to state.
To locate your nearest service dealer dial 1-800-800-7310.
MTD PRO LLC
P.O. Box 361131
Cleveland, OH 44136-0019
The limited warranty set forth below is given by MTD Pro LLC
with respect to new merchandise purchased and used in the
United States, its possessions and territories.
MTD Pro LLC warrants this product against defects in material
and workmanship for a period of two (2) years commencing on
the date of original purchase and will, at its option, repair or
replace, free of charge, any part found to be defective in material
or workmanship. This limited warranty shall only apply if this
product has been operated and maintained in accordance with
the Operator’s Manual furnished with the product, and has not
been subject to misuse, abuse, commercial use, neglect,
accident, improper maintenance, alteration, vandalism, theft, fire,
water or damage because of other peril or natural disaster.
Damage resulting from the installation or use of any accessory or
attachment not approved by MTD Pro LLC for use with the
product(s) covered by this manual will void your warranty as to
any resulting damage. This warranty is limited to ninety (90) days
from the date of original retail purchase for any MTD Pro product
that is used for rental or commercial purposes, or any other
income-producing purpose.
HOW TO OBTAIN SERVICE: Warranty service is available, WITH
PROOF OF PURCHASE THROUGH YOUR LOCAL
AUTHORIZED SERVICE DEALER. To locate the dealer in your
area check for a listing in the Yellow Pages, call 1-800-800-7310
or write to
P.O. Box 361131, Cleveland, OH 44136-0019
.
This limited warranty does not provide coverage in the
following cases:
A. Tune-ups - Spark Plugs, Carburetor Adjustments, Filters
B. Wear items - Bump Knobs, Outer Spools, Cutting Line,
Inner Reels, Starter Pulley, Starter Ropes, Drive Belts
C. MTD Pro LLC does not extend any warranty for products
sold or exported outside of the United States of America,
its possessions and territories, except those sold through
MTD Pro’s authorized channels of export distribution.
MTD Pro LLC reserves the right to change or improve the design of any
MTD Pro Product without assuming any obligation to modify any product
previously manufactured.
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