Zenoah HC510DV Owner's manual

OWNER/OPERATOR MANUAL
CUT-OFF SAW
848-C8X-93A1 (60 )
HC510DV
The engine exhaust from this product
contains chemicals known to the State
of California to cause cancer, birth
defects or other reproductive harm.
WARNING
Before using our products, please
read this manual carefully to
understand the proper use of your
unit.
WARNING
Diamond wheel use only, Do not use
abrasive wheels with this product.
WARNING
APPLICABLE SERIAL NUMBERS : 200101 and up
Dust Collection Type

SAFETY FIRST
Instructions contained in warnings within this
manual marked with a symbol concern
critical points which must be taken into
consideration to prevent possible serious
bodily injury, and for this reason you are
requested to read all such instructions
carefully and follow them without fail.
■WARNINGS IN THE MANUAL
This mark indicates instructions which must be
followed in order to prevent accidents which could
lead to serious bodily injury or death.
This mark indicates instructions which must be
followed, or it leads to mechanical failure,
breakdown, or damage.
This mark indicates hints or directions useful in the
use of the product.
NOTE
IMPORTANT
WARNING
CONTENTS
1. Parts location …………………………………4
2. Specifications …………………………………4
3. Warning labels on the machine ……………5
4. Symbols on the machine ……………………6
5. For safe operation ……………………………7
6. Set up …………………………………………12
7. Fuel……………………………………………14
8. Operation ……………………………………16
9. Maintenance …………………………………20
10. Storage ………………………………………31
11. Troubleshooting guide ………………………32
12. Parts list ………………………………………33

2. Specifications
Model Name and Number ···································································CUT-OFF SAW, HC510DV
Overall Size (with 14 in. Blade)(LxWxH) ························· 29.4(735)x9.4(235)x19.8(495) in. (mm)
Dry Weight (excluding Blade) ··············································································· 29.0 lbs (13 kg)
Engine
Type ··············································· Single-Cylinder Air-Cooled 2-Cycle Gasoline Engine
Displacement ······················································································ 3.1cu-in. (49.3cm3)
Max. Speed ···························································································· 12500 1/min (rpm)
Fuel ······················································································· Mixture(Gasoline 50 : Oil 1)
(when using ZENOAH genuine oil)
Carburetor ········································································· Diaphragm Type (Walbro WT)
Ignition System······································································Electronic Controlled (C.D.I)
Spark Plug·····································································································NGK BPM8Y
Starter System······························································································Recoil Starter
Stopping System ······································································ Earth Type (Push Button)
Fuel Tank Capacity·····························································································18.5 fl.oz (0.55 )
Transmission········································································ Centrifugal Clutch, Belt Pulley, Gear
Blade Rotating Direction························································ Clockwise (From Clutch Side View)
Reduction Ratio······················································································································ 4 : 1
Max Spindle Speed ······························································································ 3100 1/min (rpm)
Vibration Isolation Mechanism····························· 8 Point Support Vibration Free Handle System
Dust Collection Mechanism································Turbo Fan Drive Forced Dust Collection System
Applicable Cutter Blade
Type ·····························································································Dry type diamond blade
Size··················································································12 in. (305mm), 14 in. (355mm)
Maximum Cut in Depth (by 14 in. Blade) ··········································································135 mm
Specifications are subject to change without notice.
1. Parts location
1. Rear handle
2. Safety lock
3. Choke knob
4. Air Cleaner cover
5. Front handle
6. Pulley cover
7. Stand
8. Decomp valve
9. Drive case
10. Throttle lever
11. Cutter blade
12. Blade cover
13. Muffler
14. Starter knobs
15. Engine stop switch
16. Fuel tank cap
17. Flange bolt
4

If warning label peel off or become
soiled and impossible to read, you
should contact the dealer from which
you purchased the product to order
new labels and affix them in the
required location(s).
Never modify your machine.
We won't warrant the machine, if
you use the remodeled machine
or you don't observe the proper
usage written in the manual.
WARNING
IMPORTANT
3. Warning labels on the machine
5

6
For safe operation and maintenance, symbols are
indicated on the machine. According to these
indications, please be careful not to take a mistake.
(a) The port to refuel the "MIX GASOLINE"
Position: FUEL TANK CAP
(b) Choke will close when pulling the choke knob
Position: CHOKE KNOB
(c) It indicates the start (I) and stop (O) direction
Position: SWITCH
WARNING
(a)
(b)
(c)
4. Symbols on the machine
Made in Japan
RedMax
IMPORTANT ENGINE INFORMATION
THIS ENGINE CONFORMS TO U.S. EPA
PH1 FOR SMALL OFF-ROAD ENGINES.
ENGINE FAMILY : 3KZXS. 0494LM ; EM
ENGINE DISPLACEMENT : 49.3cm3
REFER TO OWNER’S MANUMAL FOR MAINTE-
NANCE SPECIFICATIONS AND ADJUSTMENTS.
MANUFACTURED:
INFORMATION IMPORTANTE CONCERNANT LE MOTEUR
Ce moteur conformc aux normcs U.S. EPA
PH1 pour les petits moteurs tout-terrain.
Type de moteur : 3KZXS. 0494LM ; EM
Cylindrée du moteur : 49.3cm3
Se référer au Manuel de l'utilisateur pour les
spécifications d'entretien et les réglages.
Made in Japan
RedMax
Manufacturé :

7
5. For safe operation
■BEFORE USING THE MACHINE
a. Cut-off saws are high-speed cutting tools and
very dangerous to operate; therefore it is very
important that you read and fully understand the
contents of the owner’s manual before using.
b. This unit has been designed for use in cutting
concrete products, stone and cast-iron pipe at
outside construction site. Never use this product
for any other purpose since doing so could result
in unforeseen accidents and injuries occurring.
c. You must be certain that your physical and
mental condition is satisfactory to operate this
unit. Never attempt to operate it under the
influence of drugs or alcohol, or when fatigued.
d. Never allow children or anyone unable to fully
understand the directions given in this manual to
use this machine.
e. Avoid running the engine indoors. The exhaust
gases contain harmful carbon monoxide.
f. Never use this unit under circumstances like
those described below:
1. When the ground is slippery or when other
conditions exist which might make it not
possible to maintain a steady posture.
2. At night, at times of heavy fog, or at any other
times when you’re your field of vision might be
limited and it would be difficult to gain a clear
view of the area.
3. During rain storms, during lightning storms, at
times of strong or gale-force winds, or at any
other times when weather conditions might be
unsafe.
4. When you cannot fix cutting material.
5. Near the combustible materials such as:
petrol (gas), wood, dry grass etc.
g. When planning your work schedule, allow plenty
of time to perform the work of cutting and allow
plenty of time for rest.
Limit the amount of time over which this unit is to
be used continuously to somewhere around 10
minutes per session, and take 10~20 minutes of
rest between work sessions. Also try to keep the
total amount of work performed in a single day
under 2 hours or less.
Operating this unit over a long period of time

8
exposes the operator to Whitefinger disease.
This condition produces numerous burning
sensations and interferes with the ability to feel
and regulate temperature. Get medical advise at
once if you experience these symptoms.
h. Be sure to keep this manual handy so that you
may refer to it later whenever any questions
arise.
i. Always be sure to include this manual when
selling, lending, or otherwise transferring the
ownership of this product.
■WORKING GEAR AND CLOTHING
a. When using this unit, you should wear proper
clothing and protective equipment as follows;
1) Sturdy long pants and sturdy long-sleeved
shirt
2) Helmet
3) Anti-dust goggles
4) Anti-dust musk
5) Vibration-proof, non-slip gloves
6) Steel-toed safety boots
7) Ear protectors
b. And you should carry with you things as follows.
1) Attached tools
2) Properly reserved fuel
3) Spare wheel
4) Things to notify your working area ( Rope,
warning signs )
Never cut any material containing asbestos without
using a respirator specifically approved for that
purpose.
Some materials throw off dangerous sparks when
cut. You should wear non-flammable clothing and
gloves free of fuel, oil, or grease under these
conditions.
■ WARNING CONSIDERING HANDLING OF FUEL
1. The engine of the RedMax product is designed
to run on a mixed fuel which contains highly
flammable gasoline. Never store cans of fuel or
WARNING
5. For safe operation

refill the tank of the unit in any place where there
is a boiler, stove, wood fire, electrical sparks,
welding sparks, or any other source of heat or
fire which might ignite the fuel.
2. Never smoke while operating the unit or refilling
its fuel tank.
3. When refilling the tank, always turn off the
engine and allow it to cool down. Take a careful
look around to make sure that there are no
sparks or open flames anywhere nearby before
refueling.
4. Wipe spilled fuel completely using a dry rag if
any fuel spillage occurs during refueling.
5. After refueling, screw the fuel cap back tightly
onto the fuel tank and then carry the unit to a
spot 10feet (3m) or more away from where it
was refueled before turning on the engine.
■WARNING CONSIDERING CUTTING BLADE
a. Diamond wheel use only. Do not use abrasive
wheels with this product.
b. Treat the wheel with special care. Never roll,
drop or bump the wheel.
c. Use proper wheel for the cutting material.
Improper wheels may shatter or break, exposing
the operator to serious injury or death.
d. Check the wheel for broken, loose, or damaged
parts before attaching it to the engine unit.
Repair or replace before using.
e. When replacing the blade, run the engine
without load in low speed for more than 3
minutes so as to check the unit for abnormal
noise or vibration before the actual cut.
f. Never do the zigzag cut, curve cut, diagonal cut
(without guide) or chape. Never use the side
surface of the wheel.
■WARNING ON STARTING THE ENGINE
a. Check the condition and safety of working area
and cutting object.
b. Remove any obstacle from working area.
Warning signs should be placed around the
hazardous area (within a perimeter of 50 feet of
the operator) into which no one should enter.
c. When work is to be performed simultaneously by
two or more persons, preconcert how to check
5. For safe operation
9

10 
the other one’s presence and how to sign the
danger etc.
d. Fix the cutting object if it is unfixed.
e. Never operate the engine without wheel guard.
f. Adjust the wheel guard to deflect sparks, dust,
and material away from the operator and
flammable materials.
g. Inspect the entire unit for loose fasteners and
fuel leakage. Make sure that the blade is
properly installed and securely fastened.
h. The product is equipped with a centrifugal clutch
mechanism, so the wheel begins to rotate as
soon as the engine is started when the throttle is
in the start position. When starting the engine,
place the unit on firm ground or other solid
surface in an open area and hold it firmly in
place so as to ensure that neither the wheel
comes into contact with any obstacle when the
engine starts.
i. Never attempt to drop-start the engine.
j. Be sure the wheel does not turn while the engine
is idling. Adjust the carburetor if necessary.
■OPERATION SAFETY PRECAUTIONS
a. Grip the handles firmly with both hands. Place
your feet slightly apart so that your weight is
distributed evenly across both legs, and always
be sure to maintain a steady, even posture while
working.
b. Keep all parts of your body away from rotating
wheel.
c. Never raise the engine speed above the
maximum spindle speed (3000 1/min(rpm)).
d. If the unit start to shake or vibrate, turn off the
engine and check the whole unit. Do not use it
until the trouble has been properly corrected.
e. Keep the wheel always sharp. While using the
unit, if the wheel won’t cut well caused by
clogging, set the teeth of the saw by cutting
concrete block, clayware or sandstone.
f. Avoid standing in a direct line with the cutting
wheel.
g. Never force to push off the wheel on the cutting
object.
h. Use only downward pressure on the saw, as
lateral pressure may cause the blade to brake
and shatter.
5. For safe operation