China Hangyu EHS350C Application guide

PORTABLE CUT-OFF SAW
EHS350C
Operation/Parts Manual
Version No. 061003
Introduction
Thank you for
purchasing our cutoff saw
Model: EHS350C
WARNING: For safety and efficient operation, always follow the instructions in this manual

This Manual contains operating and safety instructions for your Model EHS350C
cut-off saw.
r cut-off saw model EHS350C,
is important that you read and understand the maintenance and safety manual before
ny of the instructions in this Manual.
, special safety precautions must be
bserved before operating the saw. Careless or improper use could cause serious or even
atal injury.
To receive maximum performance and satisfaction from you
it
operating the saw. Contact your dealer or the distributor in your area if you do not
understand a
Because the EHS350C operates at high speed
1
o
f

Table of Contents
Main parts of EHS350C and their functions………………………………………5- 9
Safety precautions………………………………………………………..…………..10- 20
Specifications……………………………………………………..……………………21- 22
Operation guide to EHS350C cut-off w…………………………………….……23- 32
1. Before starting…………………………………………………………………….23 - 26
2. Starting……………………………………………………………………………..27- 29
2
sa

3. Operation…………………………………………………………………………..30
4. Emergency St
1
41
opping……………………………………………………………..31
5. Notes on operation……………………………………………………………..…31- 32
Adjustment of EHS350C cut-off saw………………………………………………..32- 34
1. Adjusting V-belt tension………………………………………………………..…32
2. Adjusting carburetor…………………………………………………..…………..32- 34
3. Adjusting blade guard………………………………………………….…………34
Maintenance & repair of EHS350C cut-off saw…………………….………….…..35- 4
1. Cleaning and maintenance of air filter………………………………………….35 - 36
2. Maintenance of spark plug……………………………………………………….36- 37
3
3. Replacing starter rope……………………………………………………………37 - 38
4. Replacing pawl…………………………………………………………………….39
5. Maintenance chart…………………………………………………………………40-

Storing EHS350C cut-off saw…………………………………..…………………….42
Exploded parts views and parts lists……………………………………………….43- 59
nd a
ven by
y for
utting work.
1. Crankshaft Housing Assembly…………………………………………………..43-44
2. Crankshaft & Piston Assembly…………………………………………………..45-46
3. Cylinder & Muffler Assembly……………………………………………………..47-48
4. Oil Tank & Carburetor…………………………………………………………….49-50
5. Handle & Main Cover Assembly…………………………………………………51-52
6. Air Filter Assembly………………………………………………………………..53-54
7. Transmission Box & Cutter Assembly…………………………………………..55-57
8. Front Handle & Support Assembly………………………………………………58-59
M ia n parts of EHS350C and their functions
4
This product is composed of two main sections: a gasoline powered 2-stroke engine a
dri ing/cutting system. When engine speed is up to 3800 RPM, the cutting blade, driv
the engine via belt transmission system, begins to rotate at high speed, and is read
c

Showed below are the main parts of the EHS350C cut-oflow are the main parts of the EHS350C cut-off saw and their corresponding
1. Blade
2. Flanges
3. Hexagon Bolt
4. Blade Guard
5. Front Handle
6. Spark Plug Cover
7. Kill Switch
f saw and their corresponding
1. Blade
2. Flanges
3. Hexagon Bolt
4. Blade Guard
5. Front Handle
6. Spark Plug Cover
7. Kill Switch
function descriptions (Ref. Fig 1): function descriptions (Ref. Fig 1):
5

8. Full Throttle Lock Button
9. Throttle Trigger
10. Rear Handle
11. Filter Cover Lock Lever
12. Air Filter
13. Choke Lever
14. Starter Grip
15. Fuel Tank Cap
16. Decompression Valve
17. Water Attachment
18. Tensioning Nut
19.Muffler
20. Blade Guard Positioning Knob
21. Shaft lock
1. Blade:
Diamond or abrasive blades. Depending on t, these blades are
made of different materials. Be sure to being cut.
The maximum diameter of the blade for th ating speed of
the blade should be above or equal to 47
2. Flanges:
Clamp and support the diamond or abrasive blad
the material to be cu
6 choose right blade for the material
e saw is 14 inch. And the oper
00 RPM.
e.

3. Hexagon Bolt:
n.
switch is pressed and held.
ng this button while the trigger is fully
eturns the throttle to idle position.
lling the trigger backward opens
leasing the trigger slows down the engine.
Handle:
Tightens blade flange.
Blade Guard:
Safety guard, directs sparks and dust away from operator.
Front Handle:
urely hold the saw while under operatio
4.
5.
Used to sec
6. Spark Plug Cover:
r for access to the spark plugA removable cove
7. Kill Switch:
en thisEngine stops wh
8. Full throttle lock button:
ull open position by pressiLocks the throttle in f
depressed. Pressing and releasing the trigger r
er:
7
9. Throttle trigg
Controls engine speed by manipulating the throttle. Pu
the throttle and the engine accelerates. Re
10. Rear

Used to securely hold the s
11.
aw while under operation.
d
r. When air pressure in the engine
ue, it automatically closes.
17. W
eeds water to both sides of diamond blade. Connect to water supply for wet cutting.
Filter Cover Lock lever:
Locks the air filter cover. Pull back on the lever to open the filter cover.
12. Air Filter:
Filters dirt and debris from entering carburetor.
13. Choke Lever:
er counter clockwise closes the carburetor. Used to prime engine (colTurning this lev
starting). Turn clockwise for normal operation.
14. Starter Grip:
Pull to start engine.
:15. Fuel Tank Cap
Open this cap for filling the fuel. Close the tank for starting and operation.
Decompression Valve:
this valve to make starting easie
8
16.
Press down on
reaches a preset val
ater Attachment:
F

18. Tensioning Nut:
turn the nut
As the EHS350C cutoff saw is a high-speed power tool, improper use of this
saw might be hazardous. To avoid property damage or personal injury, it is
For V-belt tension adjustment. Turn this nut clockwise to loosen the V-belt,
ion the V-beltcounter clockwise to tens
19. Muffler:
Reduces both noise and emissions.
oning Knob :20. Blade Guard Positi
Loosen the knob to adjust blade guard position.
21. Shaft lock:
Lock the blade shaft to facilitate blade changing and installation.
Safety Precautions: 9

EXTREMELY IMPROTANT to read, fully understand, and observe the following safety
precautio f saw.
Requirements:

e
sufficient visibility, and be
d operator stands on should be non-skid. Take extreme care
zing weather (rain, snow, frost, ice).
hand d animals should never be allowed in the work area.
e objects may be thrown toward the operator by the cutting tool. So position the
ns before operating this cut-of
1. Wo rksite
. The worksite should be free of any materials or objects that are flammable or
xplosive.
undings should be in order, with no clutters, having. Surro
well ventilated. The groun
when working in wet and free
. Bystanders should keep away from the saw when it is operating. Children, the
icapped an
. Loos
10
object to be cut securely to ensure it won’t be pushed around by the blade when
cutting.
Blade:2.

Befo e blade is above
r
or break and cause serious personal injury. Failure to follow these directions
may cause the blade to shatter or crack in use causing serious or fatal injury.
Never use
personal inj
iamond blades have a much better cutting performance than standard abrasive blades.
The blades are steel centered and diamond rticles are imbedded in their cutting edges.
re installing a blade make sure that the maximum operating speed of th
or equal to the spindle speed of your cut-off saw. Inspect the cutting blade frequently and
ace immediately if the cutting blade is cracked or warped. Cracked or warped blades
shatter
epl
may
carbide-tipped, woodcutting or circular machine blades. They can cause severe
ury from reactive forces, blade contact or thrown objects.
Use of the wrong cutting blade for which it was not designed may cause that blade to shatter
causing serious or fatal injury. 11
Only use the cutting blade approved for the type of material to be cut.
D
pa

Wet or dry cutting is possible. Cutting wet will extend the life of your diamond blades. A
ater attachment comes as standard equipment with the EHS350C. Before using the
is tightened.
Always install the blade so that the arrow on the blade points in direction of the rotation of
efore carrying or transporting your cut-off machine the engine must be off. Never leave
gonal
d correct if necessary.
art and operate this saw without
w
water attachment make sure that the screw that secures the outlet tube
the spindle.
B
the engine running whilst unattended, e.g. on the ground.
Proper tension of the V-belt is important. In order to avoid a false setting, the tensioning
rocedure must be followed as described in your manual. Always make sure the hexa
12
p
collar nuts for the cast arm are tightened securely. Check V-belt tension after one hour of
operation an
3. Operator:
. The cut-off saw is a one–person tool. So st

assistance.
. Make sure you are in good physical condition and are not under the influence of any
substance such as drugs or alcohol which may impair vision or dexterity. Take breaks
as needed to prevent you from getting fatigued.
.
Never let the EHS350C saw run unattended. NO untrained personal should ever be
use a cut-off machine. Bystanders, especially children and animals should
l
ear shorts.
allowed to
not be allowed in the area where a cut-off machine is in use.
Do not lend or rent your cut-off machine without the Operation Manual. Employers
should establish a training program for operators of this saw to ensure safe operation of
the EHS350C.
Avoid loose – fitting jackets, scarf, neckties, jewelry, flared or cuffed pants, unconfined
ong hair or anything that could become caught on any obstacles or moving parts of the
unit. Wear overalls or long pants to protect your legs. Do not w
13
Protect your hands with gloves when handing the cut-off saw. Heavy-duty, non-slip
gloves improve your grip and protect your hands.

with nonskid soles. Steel-toed safety
boots are recommended.
rly fitted safety glasses with adequate
otection is a must!
Use EHS350C cut-off saw only with both hands, keeping a firm grip on the front and
rear handles.
Maintain good balance and footing at all times.
Good footing is most important. Wear sturdy boots
To reduce the risk of injury to your eyes, never operate the cut-off saw
unless wearing goggles or prope
top and side protection. Proper eye pr
14
Wear an app d safety hard hat to protect your head. Cut-off machine noise could
Cutting masonry, concrete, metal and other materials can generate dust,
rove
damage your hearing. Earplugs or ear mufflers shall be worn at all times.

mists and fumes containing chemicals known to cause serious or fatal injury or illness,
such as respiratory disease, cancer, birth defects or other reproductive harm. Cutting
masonry, concrete and othe f dustr materials with silica in their composition may give of
espirator is
recommend d.
. Do not cut m
injury. Do not
4.
ed. Make sure all rubber hoses for oil flow are
tightly connected with no leaks.
, the Full Throttle Lock Button, the Choke
containing crystalline silica. Silica is a basic component of sand, quartz, brick clay,
granite and numerous other minerals and rocks. Use of an approved r
e
aterials containing asbestos as asbestos dust can cause severe physical
cut materials containing highly volatile or flammable substances.
Inspection of the cutoff saw before use:
. Make sure there are no loose objects on or near the saw.
. Except for the carburetor adjustment screws, all other bolts, nuts, screws and the fuel
tank cap should be securely tighten
15
. Make sure the blade rotates smoothly; the starter rope can be pulled through and
guided back without being tangled.
. Check to make sure the Throttle Trigger

Lever, the Decompression Valve and the kill Switch all function well without failure.
.
as necessary so
ef. Fig.2)
. Check to make sure the V-belt is properly

 y and clean.
und or if it’s not completely and securely
assembled and properly adjusted.
5. Precautions on starting:
rope around your hand.
Fig 2
16
Check to make sure the blade guard has no
visual damage. Adjust the guard
the spark beam generated during cutting can be
directed away from the operator. (R

tensioned.
. Make sure the saw is free of oil spillage.
. Make sure the main cover and the handles are dr
. Do not attempt to start the saw if damage is fo
. Keep a good balance and secure footing.
. Take hold of the st earter grip firmly; do not wrap th

. To start, place the machine firmly against
the ground and make sure the blade is not in
contact with the ground or the object to be
cut.
. Pull sharply on the rope and guide it back
y
6. Pr
. Keep a good balance and secure footing while holding the saw firmly at all times.
. ake the engine accelerate gradually.
beginning to work.
de slowly toward the object to be cut, increase the pressure
ter the cutting edge comes in contact with the o Make sure the
.
slowly. Do not let go of the grip halfwa
through the pull to prevent it from snapping
back.
ecautions on operation:
Fig 3
17
(Ref. Fig.3)
Press the throttle trigger backward slowly to m
Wait until the blade builds up the rpm’s before
. Move the rotating bla
gradually af
cutting depth is appropriate
bject.

. Do not change direction of the cut or twist during the cut as this may produce a high
orsion load o t n the blade and may cause it to break or shatter. Only move the machine
.

ake sure it won’t hit any part of your body or pinch the

t at this time. so
e or

n angle or push it into the cut as this may result in a
along a straight line, forward or “to and fro” in the cutting direction.
When cutting, position the saw at an appropriate distance so that your body is clear of
the blade attachment yet you don’t have to overreach.
. Release the pressure on the saw when the blade completes a cut. The cut-off portion
of the object may drop, so m
blade. .
. Whenever you hear an abnormal sound coming out of the cut-off saw, stop cutting
immediately for inspection (Note the muffler and the blade are very ho
take care not to get burned). Only resume work after the trouble is eliminated
. Do not make adjustments or any other maintenanc
troubleshooting with the cut-off saw while it is running.
. Take precaution when re-entering a cut and do not turn the
blade at a
pinching of the blade.
18

7. P
. ne cool off naturally. Do not take any other forceful
sure build-up in the tank to
y after fueling and clean off spillage if any.

have your body get
t
or repair work in clean and neat environment. Use proper tools
a
. Use only identical spare parts for
recautions on fueling:
. Fuel the machine only in a well-ventilated environment.
Before refueling, let the engi
measures to cool the engine down.
Remove the fuel tank cap carefully so as to allow any pres.
release slowly. (Ref. Fig.4)
. Tighten fuel cap securel
Fig. 4
8. Notes on transporting:
. Always stop the engine before relocating the saw.
19
.When carrying the machine with a hot engine, take care not to
burned by the muffler.
. Prevent the saw from touching the ground or any hard objects
s onNo e maintenance:
Perform any maintenance
nd operate with caution.
9. Do not attempt to modify your cut-off saw in any way