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INTRODUCTION

Congratulations on your selection of a Honda trimmer/brush cutter!

We are certain you will be pleased with your purchase of one of the

finest trimmer/brush cutters on the market.

We want to help you get the best results from your new trimmer/brush

cutter and to operate it safely. This manual contains the information

on how to do that; please read it carefully.

We suggest you read the DISTRIBUTOR’S LIMITED WARRANTY

(page 30) and the EMISSION CONTROL SYSTEM WARRANTY

(page 31) to fully understand its coverage and your responsibilities of

ownership.

When your trimmer/brush cutter needs scheduled maintenance, keep

in mind that your Honda servicing dealer is specially trained in

servicing Honda trimmers/brush cutters. Your Honda servicing dealer

is dedicated to your satisfaction, and will be pleased to answer your

questions and concerns.

Keep this owner’s manual handy, so you can refer to it at any time.

This owner’s manual is considered a permanent part of the trimmer

and should remain with the trimmer if resold.

The information and specifications included in this publication were in

effect at the time of approval for printing. Honda Power Equipment

Mfg. Inc. reserves the right, however, to discontinue or change

specifications or design at any time without notice and without

incurring any obligation whatever. No part of this publication may be

reproduced without written permission.

SAFETY MESSAGES

Your safety and the safety of others are very important. We have

provided important safety messages in this manual and on the

trimmer/brush cutter. This information alerts you to potential hazards

that could hurt you or others. Please read these messages carefully.

Of course, it is not practical or possible to warn you about all the

hazards associated with operating or maintaining a trimmer/brush

cutter. You must use your own good judgment.

You will find important safety information in a variety of forms:

• Safety Labels – on the trimmer/brush cutter.

• Instructions – how to use this trimmer/brush cutter correctly and

safely.

• Safety Messages – preceded by a safety alert  symbol and one

of three signal words: DANGER, WARNING, or CAUTION. These

signal words mean:

Each message tells you what the hazard is, what can happen, and

what you can do to avoid or reduce injury.

• Damage Prevention Messages – You will also see other

important messages that are preceded by the word NOTICE. This

word means:

CONTENTS

 DANGER

You WILL be KILLED or SERIOUSLY

HURT if you don't follow instructions.

 WARNING

You CAN be KILLED or SERIOUSLY

HURT if you don't follow instructions.

 CAUTION

You CAN be HURT if you don't follow

instructions.

NOTICE

Your trimmer or other property can be

damaged if you don’t follow instructions.

INTRODUCTION ...............................1

SAFETY MESSAGES........................1

TRIMMER SAFETY...........................2

IMPORTANT SAFETY

INFORMATION.............................2

ATTACHMENTS &

MODIFICATIONS .........................2

IMPORTANT MESSAGE TO

EMPLOYERS ...............................2

SAFETY LABEL LOCATIONS......3

RECOMMENDED CUTTING

ATTACHMENTS................................3

CUTTING-LINE HEADS AND

SHIELDS ......................................3

BLADES AND SHIELDS...............4

ASSEMBLY .......................................5

IMPORTANCE OF PROPER

ASSEMBLY ..................................5

IMPORTANT SAFETY

PRECAUTIONS............................5

UNPACKING ................................5

LOOSE PARTS ............................6

U-TYPE HANDLEBAR..................6

SAW BLADE.................................7

ENGINE OIL .................................8

BEFORE USING YOUR

TRIMMER ..................................8

CONTROLS AND EQUIPMENT........9

COMPONENT CONTROLS AND

LOCATIONS .................................9

CONTROLS..................................9

EQUIPMENT ..............................10

BEFORE OPERATION....................11

ARE YOU READY TO OPERATE

THE TRIMMER?.........................11

IS YOUR WORKING AREA

READY? .....................................11

IS YOUR TRIMMER READY TO

GO? ............................................11

ARE YOUR SHOULDER HARNESS

AND TRIMMER CORRECTLY

ADJUSTED?...............................12

OPERATION ................................... 12

SAFE OPERATING

PRECAUTIONS........................12

STARTING THE ENGINE...........13

STOPPING THE ENGINE .......... 13

TRIMMER/HARNESS QUICK

DISCONNECTION......................14

TRIMMER OPERATION.............14

SAFE OPERATING PRACTICES15

OPERATING TIPS .....................15

SERVICING YOUR TRIMMER........ 16

THE IMPORTANCE OF

MAINTENANCE..........................16

MAINTENANCE SAFETY...........16

MAINTENANCE SCHEDULE..... 17

ENGINE...................................... 17

CUTTING ATTACHMENTS........19

FUEL SYSTEM...........................24

COOLING FIN INSPECTION .....24

STORAGE.......................................25

TRANSPORTING............................26

TAKING CARE OF UNEXPECTED

PROBLEMS.....................................26

TECHNICAL INFORMATION..........27

EMISSION CONTROL SYSTEM 27

SPECIFICATIONS......................28

CONSUMER INFORMATION ......... 29

DISTRIBUTOR'S LIMITED

WARRANTY ............................... 30

ACCESSORIES, REPLACEMENT

PARTS, AND APPAREL

WARRANTY ............................... 30

EMISSION CONTROL SYSTEM

WARRANTY ............................... 31

QUICK REFERENCE

INFORMATION...........................32

OWNER’S MANUAL

HHT25S • HHT35S

Trimmer/Brush Cutter

 WARNING: 

The engine exhaust from this product contains

chemicals known to the State of California to cause

cancer, birth defects or other reproductive harm.

31VL3D11

00X31-VL3-D110

EM5

POM31VL3D11

xxxx.2008.02

PRINTED IN U.S.A.

IPC

Summary of content (32 pages)

PAGE 1
INTRODUCTION Congratulations on your selection of a Honda trimmer/brush cutter! We are certain you will be pleased with your purchase of one of the finest trimmer/brush cutters on the market. OWNER’S MANUAL HHT25S • HHT35S Trimmer/Brush Cutter We want to help you get the best results from your new trimmer/brush cutter and to operate it safely. This manual contains the information on how to do that; please read it carefully.
PAGE 2
TRIMMER SAFETY Keep the Trimmer Properly Maintained IMPORTANT SAFETY INFORMATION • The cutting attachment should be examined for looseness, cracks, broken parts, or excessive wear. Tighten or replace as needed before operating the trimmer. The Honda HHT25S and HHT35S trimmer/brush cutters are designed to cut grass, weeds, brush, and/or wood if equipped with an appropriate cutting attachment. Other uses can result in injury to the operator or damage to the trimmer and other property.
PAGE 3
SAFETY LABEL LOCATIONS The labels shown here contain important safety information. Please read them carefully. These labels are considered permanent parts of your trimmer/brush cutter. If a label comes off or becomes hard to read, contact an authorized Honda servicing dealer for a replacement. RECOMMENDED CUTTING ATTACHMENTS CUTTING-LINE HEADS AND SHIELDS A cutting-line head containing nylon monofilament line and a debris shield with a cutoff knife is standard equipment.
PAGE 4
BLADES AND SHIELDS Weed/Brush Blades A variety of blades are available from your Honda trimmer servicing dealer. Always use a debris shield designed for use with a blade when attaching a blade to your trimmer. The blade type debris shield does not have a cutoff knife. These metal blades have chisel-shaped teeth that are used for cutting through field grass, thick weeds, and light brush. They are not designed for sawing woody material. The teeth must be sharp for good results.
PAGE 5
CUTTING ATTACHMENT APPLICATIONS ASSEMBLY Type Line Size Blade Diameter After assembly and before operation, review the SAFE OPERATING PRECAUTIONS on page 12. HHT25S 0.095 in 9 in IMPORTANCE OF PROPER ASSEMBLY HHT35S 0.095 or 0.105 in 9 or 10 in Proper assembly is essential to operator safety and the reliability of the machine. Any error or oversight made by the person assembling and servicing a machine can result in faulty operation, damage to the machine, or injury to the operator.
PAGE 6
LOOSE PARTS U-TYPE HANDLEBAR Check all loose parts against the following list. Contact your authorized Honda servicing dealer if any of the loose parts shown are not included with your trimmer. Installation 1. Remove the four 5 x 28 mm bolt/washers and handlebar holder A. THROTTLE TRIGGER Ref. No Description Loop handle All U-type handlebar Qty.
PAGE 7
SAW BLADE 2. Install the brush/wood blade debris shield. The U-type handlebar models are shipped with a manual nylon cutting-line head installed on the trimmer. If the saw blade is needed, move the ignition switch to the STOP (O) position and disconnect the spark plug cap from the spark plug. Wear protective gloves when working around the cutting-line head and saw blade. Tighten the bolt/washers: TORQUE: 2.5 ft-lb (3.4 N·m) 5 x 28 mm BOLT/WASHER (4) Cutting-Line Head Removal SPACER (2) [3/32" (2.
PAGE 8
Blade Cover Removal ENGINE OIL 1. Turn the blade cover slowly until the cover latch is clear of the debris shield. The trimmer is shipped WITHOUT OIL in the engine. Unfasten the latch by lifting the tab off the post. 1. Place the trimmer on a level surface then remove the oil filler cap/dipstick. POST OIL FILLER OPENING TAB BLADE COVER 2. Pull the post end away from the blade and set it on top of the blade as shown. OIL FILLER CAP/DIPSTICK 2.
PAGE 9
CONTROLS AND EQUIPMENT Engine SPARK PLUG CHOKE LEVER COMPONENT CONTROLS AND LOCATIONS SPARK ARRESTER Loop Type Handle AIR CLEANER COVER CUTTING-LINE HEAD GEAR CASE STARTER GRIP PRIMING BULB LOOP HANDLE HARNESS HANGER THROTTLE SET BUTTON OPERATOR PRESENCE LEVER DEBRIS SHIELD WITH CUTOFF KNIFE FUEL RETURN TUBE (CLEAR) OIL FILLER CAP FUEL SUPPLY TUBE (BLACK) FUEL TANK CAP DRIVE CABLE FRAME PIPE CONTROLS The location and operation of the controls are similar on both the HHT25S and HHT35S models.
PAGE 10
Ignition Switch Priming Bulb The ignition switch controls the ignition system. Pressing the priming bulb pumps fuel from the fuel tank to the carburetor. This procedure is necessary for starting the engine. The ignition switch must be in the ON (I) position for the engine to start and run. Moving the ignition switch to the STOP (O) position stops the engine. To ensure fuel has reached the carburetor, press the priming bulb repeatedly until fuel can be seen in the clear plastic fuel return tube.
PAGE 11
Quick-Release Latch Eye, Face, and Head Protection The shoulder harnesses supplied with these trimmers are equipped with a quick-release latch. Always wear safety glasses or goggles that comply with ANSI standard Z87.1 to protect your eyes from thrown objects. Prescription glasses may be worn under the safety glasses or goggles. Pull the latch tab upward to detach the trimmer from the harness. Insert the latch tongue in the slot of the quick-release latch to reattach the trimmer to the harness.
PAGE 12
Cutting Attachment Inspection Balancing the Trimmer on the Shoulder Harness • Look for signs of damage to the cutting attachment (see page 19 and page 22). Replace any cutting attachment and parts that are worn out, bent, cracked, chipped, or damaged in any way. Hang the trimmer on the harness hook, and see how it balances. • If using a metal blade, be sure it is sharp. A dull blade is more likely to snag and thrust.
PAGE 13
STARTING THE ENGINE 1. To start a cold engine, move the choke lever to the CLOSED position. To restart a warm engine, leave the choke lever in the OPEN position. 6. With your left hand, hold the frame pipe just ahead of the engine. With your right hand, pull the starter grip lightly until you feel resistance, then pull briskly. Return the starter grip gently. 7. If the choke lever was moved to the CLOSED position to start the engine, gradually move it to the OPEN position as the engine warms up.
PAGE 14
TRIMMER/HARNESS QUICK DISCONNECTION Throttle Operation To quickly detach the trimmer from the harness, pull the quick-release latch tab upward. Pull the throttle trigger toward the grip to increase engine speed and start the cutting attachment rotation. The trimmer has the greatest cutting force at maximum engine speed. Release the throttle trigger to reduce engine speed. At idle, the cutting attachment should coast to a stop.
PAGE 15
Using Blades Blade Thrust (Kickback) Refer to the chart on page 5 for appropriate blade applications. Blade thrust (kickback) is the sudden, forceful, and uncontrolled movement of a blade-equipped trimmer that may occur if the blade binds while cutting or strikes a solid object. If using a blade on a Honda trimmer equipped with a loop handle, also install the optional Honda conversion kit that includes a full shoulder harness, a barrier bar, and a debris shield for blades.
PAGE 16
Trimming and Edging Use nylon line for cutting against a hard surface. Work from an angle where debris that strikes the hard surface will ricochet away from you. Avoid contact with wires, wire fences, metal rods, etc. Overlapping a wire will cause the nylon line to wrap around the wire and break off. SERVICING YOUR TRIMMER THE IMPORTANCE OF MAINTENANCE Good maintenance is essential for safe, economical, and trouble-free operation. It will also help reduce air pollution.
PAGE 17
• To reduce the possibility of fire or explosion, be careful when working around gasoline. Use only a nonflammable solvent, not gasoline, to clean parts. Keep cigarettes, sparks, and flames away from all fuel-related parts. MAINTENANCE SCHEDULE Interval 1 Before each use First month or 10 hours ENGINE Engine Oil Level Check Check the engine oil level before each use, or every 10 hours if operated continuously. Rest the trimmer on a level surface, with the engine stopped and in an upright position.
PAGE 18
Engine Oil Recommendations Throttle Cable Inspection Oil is a major factor affecting performance and service life. Use 4-stroke automotive detergent oil. Verify the throttle trigger operates smoothly and the throttle cable is undamaged. If there is visible damage, or if the throttle trigger does not operate smoothly, have your authorized Honda servicing dealer replace the throttle cable. SAE 10W-30 is recommended for all temperatures within the recommended operating range for these trimmers.
PAGE 19
4. Inspect the spark plug. Replace it if the electrodes are worn, or if the insulator is cracked or chipped. 2. Remove the two 4 x 6 mm self-tapping screws from the spark arrester, and remove the spark arrester from the muffler. 5. Measure the spark plug electrode gap with a suitable gauge. The gap should be 0.024 ~ 0.028 in (0.60 ~ 0.70 mm). Correct the gap, if necessary, by carefully bending the side electrode. SPARK ARRESTER GAP 0.024 ~ 0.028 in (0.60 ~ 0.
PAGE 20
Installing Replacement Nylon Line First, determine which cutting-line head style is on your trimmer. A manual-feed trimmer head has a three-sided knob on the bottom of the head, while the semi-matic head has a spring-loaded round button on the bottom of the head. Do not use any kind of metal, wire, or wire rope line on the trimmer. Use only Honda Genuine replacement nylon trimmer line or equivalent. 4. Wind both lines tightly and evenly from side-to-side ignoring the ridge.
PAGE 21
7. Install the spring and knob. Rotate the knob in the direction of the arrow and hand tighten securely. 6. Measure approximately 20 feet (6 meters) of new line, then thread one end through the hole in the ridge on the spool. Pull the line until the two lengths are equal. SPOOL NYLON LINE Semi-Matic (Bump-Feed) Cutting-Line Head 1. Clean any mud, dirt, debris, etc., from around the trimmer head area; otherwise, it will be more difficult to service. 2. Locate the half-round locking hole on the spool. 7.
PAGE 22
If you are not sure if the lines have snapped out of the notches, gently pull the spool away from the housing about an 1/8 inch to inspect the lines. If necessary, gently pull each line until your hear it snap out of the notch. 4. Remove spacer B and cover plate/spacer A from the output shaft. Note the order and orientation of each part as you remove them. CUTTING-LINE HEAD OUTER DRIVE CHANNEL (2) SPACER B COVER PLATE/ SPACER A ROUND LUG (2) METAL EYELET (2) 10.
PAGE 23
Blade Removal and Installation Changing the Debris Shield For loop handle models, a special optional Barrier Kit must be installed before a blade can be used. Refer to the instructions provided with each kit on how to install a blade on loop handle models. Refer to the applicable illustration for removing and installing the debris shields. Tighten the spacer bolts/washers to the specified torque. Always wear gloves and install the blade cover on the blade when working around the blade.
PAGE 24
FUEL SYSTEM Fuel Filter and Fuel Tank Cleaning Refueling 1. Remove the fuel tank cap and empty the fuel tank into an approved gasoline container. Use a funnel to avoid spilling gasoline. This engine is certified to operate on unleaded gasoline with a pump octane rating of 86 or higher. You may use regular unleaded gasoline containing no more than 10% ethanol (E10) or 5% methanol by volume. In addition, methanol must contain cosolvents and corrosion inhibitors.
PAGE 25
STORAGE STORAGE PREPARATION Proper storage preparation is essential to keep your trimmer trouble free and looking good. The following steps will help to keep rust and corrosion from impairing your trimmer's function and appearance, and will make the engine easier to start when you use the trimmer again. Adding Fuel Stabilizer to Extend Fuel Storage Life When adding a fuel stabilizer, fill the fuel tank with fresh gasoline.
PAGE 26
TRANSPORTING Low Power or Engine Speed Won’t Increase Possible Cause Correction BEFORE LOADING Air filter is dirty or clogged. Clean or replace the air filter. If the engine has been running, allow it to cool for at least 15 minutes before loading the trimmer on the transport vehicle. A hot engine and exhaust system can burn you and can ignite some materials. Fuel filter is dirty or clogged. Replace the fuel filter. Throttle cable is out of adjustment, broken, or bent.
PAGE 27
TECHNICAL INFORMATION This section contains important information about serial number locations, high altitude operation, and emission control systems. Serial Number Locations There are two serial numbers, one for the trimmer and one for the engine. Record these numbers in the space provided. You will need to have these numbers available when ordering parts or making technical or warranty inquiries (page 29).
PAGE 28
Air Index DIMENSIONS An Air Index Information hang tag/label is applied to engines certified to an emission durability time period in accordance with the requirements of the California Air Resources Board. Handle Installed Length HHT25S HHT35S Manual feed head 73.4 in (1865 mm) 73.8 in (1875 mm) Semi-matic feed head 73.4 in (1865 mm) 73.8 in (1875 mm) With saw blade installed 74.4 in (1890 mm) 75.0 in (1905 mm) Loop 12.8 in (325 mm) 12.8 in (325 mm) U-type 23.6 in (600 mm) 23.
PAGE 29
CONSUMER INFORMATION FRAME Model GX25 GX35 Ignition switch Slide type Throttle control Two-motion trigger style Frame pipe OD 1.0 in (25.4 mm) Thickness 0.059 in (1.5 mm) Drive type Material OD Engagement Flexible steel cable 0.25 in (6.3 mm) 0.20 in (5 mm) square drive both ends Drive bushing Material Nylon Length 57.5 in (1460 mm) Gear case Ratio 1.24 : 1 (input : output shaft) Type Ball bearings, helical cut gears, no shims required Clutch Size Engagement 2.18 in (55.2 mm) 3.
PAGE 30
Replacement Parts, Optional Equipment, and Service Items To Obtain Warranty Service: Contact an authorized Honda servicing dealer to purchase any of these (or other) Honda Genuine items. Replacement Parts Item Part Number Notes Air cleaner element 17211-Z0H-000 17211-Z0Z-000 HHT25 HHT35 Spark plug 31915-Z0H-003 NGK: CMR5HSB Cutting-line 72512-095-0855Q 0.095" spool 3 lb (855 ft) 72512-095-0285Q 0.
PAGE 31
What American Honda Will Repair or Replace Under Warranty: All of the United States and Canada American Honda will repair or replace, at its option, any power equipment accessories, replacement parts, or apparel that are proven to be defective in material or workmanship under normal use during the applicable warranty time period. Anything replaced under warranty becomes the property of American Honda Motor Company, Inc.
PAGE 32
QUICK REFERENCE INFORMATION To Obtain Warranty Service: You must take your Honda Power Equipment engine or the product on which it is installed, along with your warranty registration card or other proof of original purchase date, at your expense, to any Honda Power Equipment dealer who is authorized by Honda to sell and service that Honda product during his normal business hours.