H&S CHS Instruction Manual

P.O. Box 393

Wadsworth, OH 44282 U.S.A.

Tel: [phone]

Fax: [phone]

www.hstool.com

General Operation

Instructions, Parts and

Maintenance Manual

Model CHS

Read Safety Recommendations Before Operating Tool

Model CHS Hand Held Saw

Model

Number

CHS Side

Exhaust

Direction

Throttle

Type

Safety

Lever

Rated

Speed

6000

R.P.M.

2.0 H.P
1500 W

Power
Output

Case

Material

Aluminum

● 7 Inch (180 mm) or 9 Inch (230 mm) Type 27 Wheels

● 10 Inch Type 1 (Type 41) Cut-off Wheel

Weight

8.0 Lb/

3.6 Kg

Capacity

Overall
Lenght

15 inch

381 mm

Body

Diameter

3.0 Inch

76.2 mm

Working Air

Consumption

40 cfm

(18.9 L/s)

Spindle Length & Thread

T2-5/8-11 x 1.1 inch (28mm)

Operation Instructions and Safety Precautions

This is meant to highlight sections of safety standards published by the American National Standards
Institute and the Occupational Safety and Health Administration. This is not meant to replace those
standards but only highlight certain areas.
When care is taken to ensure that the right tool is operated properly, and safety and maintenance
procedures are followed, accidents can be avoided. Read and follow all instructions and directions.
Comply with all rules governing the use of power tools, personal protective equipment and equipment
guards.
Remember - machines, attachments and accessories must be used only for the purpose for which
they were designed. Safety reasons and product liability prohibit any modifications to tools. Any
attachments or accessories must be agreed to in advance with an authorized technical
representative of H&S Tool, Inc.

6,000

RPM

The grinding equipment must be approved for the

rated speed of the machine. The rated speed,

marked on the machine, should not be exceeded.

Be sure to learn the proper handling and storage

of abrasive wheels and inserted tooling.

Inspect the wheel guard for any signs of wear and

that it is properly mounted to the tool. Any guard

showing signs of wear such as bends, chips,

nicks, or cracks should be replaced.

Check hose size and air pressure. The air pressure at the tool shall
not exceed 90 psi (6.2 bar). All hoses should be inspected regularly
and kept away from heat, oil and sharp edges. Be sure the tool is
secured to the air hose.

Measure the speed of grinders every 20 hours of actual use or once
per week, whichever comes first.

4
3
2

1

6

5 7

RPM

1,000

8

9

Always wear eye and hearing protection, and when

necessary, other personal protective equipment
such as gloves, an apron, and helmet. Properly

fitted protective clothing cushion the operator from

vibration exposure and help prevent minor scrapes

that might occur as a result of guiding the tool along

the workpiece.

Additional information on eye protection is available

in the following national regulatory standards.

1) Federal OSHA Regulations 29 CFR, Section

1910.133 (Eye and Face Protection)

2) ANSI Z87.1 (Occupational and Educational Eye
and Face Protection)

Measure speed of all types of grinders after maintenance or repair,
whenever a grinder is issued from the tool crib and at each wheel
change. Several readings should be taken.

This form of inspection should be made with the grinding wheel or
tooling removed.

Proper mounting of grinding

wheels and inserted tooling is

crucial to safe operation and

efficient working conditions.

Ensure the exhaust air is

directed away from bystanders.

Disconnect the tool from the air

supply before doing any service.

This prevents accidental start-ups.

Airborne particulate resulting

from the grinding process can

cause hazards. Wear appropriate

protective equipment.

Safety in Operation

The safety procedures for operating air tools are everyone’s responsibility. The following lists several

aspects of air tool safety that should be considered during operation. Please be aware of the these
aspects and report any unsafe practice you see to a supervisor or safety officer immediately.

1) Start any new wheel under a bench and away from bystanders. (Run for a minimum of one
minute.)

2) When starting a cold/new wheel, apply to the work slowly, allowing the wheel to warm gradually.

3) Support the work piece properly.

4) When cutting off, support the work piece so that a jamming of the wheel does not occur. (A Slot

shall remain constant or become wider during operation.)

5) If a jamming of the wheel does occur during a cutting off operation, shut the air supply off to the tool
and ease the wheel free. (Inspect the wheel for damage before continuing operation.)

6) Ensure that sparks from the process do not create a hazard to the eyes or will ignite the
environment.

7) Grinders shall not be used in potentially explosive atmospheres.

8) Pneumatically driven tools are not generally insulated from coming in contact with electrical

sources. Be sure to avoid contact with wires or other possible current carrying sources.

9) The operator must check that no bystanders are in the vicinity.

10) Remember that there is a running on after the throttle has been released.

11) If a grinder fitted with an abrasive wheel is dropped, the wheel must be thoroughly examined

before re-use.

12) Disconnect the tool from the air source before servicing and changing wheels.

13) Release the control device in case of interruption of air supply.

14) Always keep the tool in a clean, dry place when not in use.

15) Beware of loose hair and clothing so as not to become tangled or trapped during operation.

16) Unexpected tool movement or breakage of inserted tooling may cause injuries to lower limbs.

17) Unsuitable postures may not allow counteracting of normal or unexpected movement of a power

tool. (A working position shall be adopted which remains stable in the event of a break up of inserted
tooling.)

18) Do not hold the tool near the body when operating.

19) Keep a firm grip on the tool body during operation.

Maintenance

Disassemble

1. Disconnect tool from air supply and remove all wheels or accessories. Remove spindle lock assembly (AA-NRA-20).

2. Secure the tool in vise vertically with the angle head (NRA-1) toward downward direction. Clamp lightly onto dead
handle boss on the side of angle head. Using a wrench on flats at base of live handle, unscrew motor housing from angle
head. Remove motor from case or angle head (depending on how it came apart).

The Motor Assembly

3. Place brass jaws on vice. Secure pinion gear (NRA-10) in vise and remove governor (NGOV-XX). (Left-hand thread).
(Governor wrench (1100-832) is available to properly remove the governor with less risk of damage.) Remove assembly
from vise.

4. Clamp motor assembly into vise with output pointed down. Clamp lightly onto the cylinder (N2) and rear endplate (NV-

3). Place a small punch into the center of the motor spindle (NRB-5) where the governor was removed. Tap lightly on end
of punch with a small hammer. This will drive the spindle through the rear bearing (NV-9) (Be sure not to damage threads
on the rear of the spindle.) (Take care not to drop the spindle assembly when it becomes free.) Remove from vise.

5. Remove rear bearing from rear endplate (NV-3) with a small punch or screwdriver. Remove rotor blades (N6) from
rotor/spindle

6. Place brass jaws on vise. Clamp front spindle assembly in vise vertically with output in upward direction. Clamp onto
the large outside diameter of the rotor/spindle. Remove pinion gear (NRA-10) with a wrench. Remove assembly from vise.

7. Press output end of spindle through front bearing (NRA-8) with an arbor press. Remove front bearing support (NRA-8).

The Angle Head

8. Remove snap ring (NRA-14) using snap ring pliers. Remove spacer (NRA-13) and o-ring (594030). Lift output spindle
assembly from angle head.

9. Place brass jaws on vise. Clamp firmly onto threads of output assembly. Unscrew and remove screw (591164) from end
of spindle. Remove from vise.