Central Pneumatic 99792 Installation manual

HEAVY-DUTY

AIR CHIPPING HAMMER

99792

SET UP AND OPERATING INSTRUCTIONS

Distributed exclusively by Harbor Freight Tools®.

3491 Mission Oaks Blvd., Camarillo, CA 93011

Visit our website at: http://www.harborfreight.com

Read this material before using this product.

Failure to do so can result in serious injury.

SAVE THIS MANUAL.

contained herein may be reproduced in any shape or form without the express written consent of

Harbor Freight Tools. Diagrams within this manual may not be drawn proportionally. Due to continuing

improvements, actual product may differ slightly from the product described herein. Tools required for

assembly and service may not be included.

For technical questions or replacement parts, please call 1-800-444-3353.

Manual Revised 11h

SKU 99792 For technical questions, please call 1-800-444-3353. Page 2

CONTENTS

SAFETY ALERT SYMBOL AND

SIGNAL WORDS .............................3

IMPORTANT SAFETY

INSTRUCTIONS .......................... 3

GENERAL...........................................3

WORK AREA......................................3

PERSONAL SAFETY .........................4

TOOL USE AND CARE ...................... 4

SERVICE ............................................5

AIR SOURCE......................................5

SYMBOLS AND SPECIFIC

SAFETY INSTRUCTIONS ........... 5

SYMBOL DEFINITIONS .....................5

SPECIFIC SAFETY INSTRUCTIONS 6

VIBRATION PRECAUTIONS ........ 7

FUNCTIONAL DESCRIPTION....... 8

SPECIFICATIONS ..............................8

INITIAL TOOL SET UP/

ASSEMBLY.................................. 8

UNPACKING.......................................8

AIR SUPPLY.......................................8

INSTALLING A CHISEL .....................9

WORK PIECE AND WORK AREA

SET UP .......................................... 11

GENERAL OPERATING

INSTRUCTIONS ............................ 11

CHIPPING IN A STRAIGHT

LINE:.........................................12

BREAKING UP CONCRETE: ..... 12

USER-MAINTENANCE

INSTRUCTIONS ........................ 13

CLEANING, MAINTENANCE, AND

LUBRICATION...............................13

TROUBLESHOOTING......................14

PARTS LIST................................. 15

ASSEMBLY DIAGRAM................ 16

LIMITED 1 YEAR WARRANTY ... 17

SKU 99792 For technical questions, please call 1-800-444-3353. Page 3

SAVE THIS MANUAL

Keep this manual for the safety warn-

ings and precautions, assembly, operat-

ing, inspection, maintenance and cleaning

procedures. Write the product’s serial

number in the back of the manual near the

assembly diagram (or month and year of

purchase if product has no number). Keep

this manual and the receipt in a safe and

dry place for future reference.

Safety Alert Symbol and Signal

Words

In this manual, on the labeling,

and all other information provid-

ed with this product:

This is the safety alert

symbol. It is used to alert

you to potential personal

injury hazards. Obey all

safety messages that

follow this symbol to avoid

possible injury or death.

DANGER indicates

a hazardous

situation which, if not

avoided, will result in death or

serious injury.

WARNING

indicates a

hazardous situation which, if

not avoided, could result in

death or serious injury.

CAUTION, used

with the safety

alert symbol, indicates a

hazardous situation which, if

not avoided, could result in

minor or moderate injury.

NOTICE is used to

address practices

not related to personal injury.

CAUTION, without

the safety alert

symbol, is used to address

practices not related to

personal injury.

IMPORTANT SAFETY

INSTRUCTIONS

INSTRUCTIONS PERTAINING

TO A RISK OF FIRE,

ELECTRIC SHOCK, OR

INJURY TO PERSONS

WARNING – When using tools, basic pre-

cautions should always be followed,

including the following:

General

a. To reduce the risks of electric

shock, re, and injury to persons,

read all the instructions before us-

ing the tool.

Work area

a. Keep the work area clean and well

lighted. Cluttered benches and dark

areas increase the risks of electric

shock, re, and injury to persons.

b. Do not operate the tool in explo-

sive atmospheres, such as in the

presence of ammable liquids,

gases, or dust. The tool is able to

create sparks resulting in the ignition

of the dust or fumes.

c. Keep bystanders, children, and

visitors away while operating the

SKU 99792 For technical questions, please call 1-800-444-3353. Page 4

tool. Distractions are able to result in

the loss of control of the tool.

Personal safety

a. Stay alert. Watch what you are do-

ing and use common sense when

operating the tool. Do not use the

tool while tired or under the inu-

ence of drugs, alcohol, or medica-

tion. A moment of inattention while

operating the tool increases the risk

of injury to persons.

b. Dress properly. Do not wear loose

clothing or jewelry. Contain long

hair. Keep hair, clothing, and

gloves away from moving parts.

Loose clothes, jewelry, or long hair

increases the risk of injury to persons

as a result of being caught in moving

parts.

c. Avoid unintentional starting. Be

sure the switch is off before con-

necting to the air supply. Do not

carry the tool with your nger on the

switch or connect the tool to the air

supply with the switch on.

d. Remove adjusting keys and

wrenches before turning the tool

on. A wrench or a key that is left at-

tached to a rotating part of the tool

increases the risk of personal injury.

e. Do not overreach. Keep proper

footing and balance at all times.

Proper footing and balance enables

better control of the tool in unexpect-

ed situations.

f. Use safety equipment. A

dust mask, non-skid safety

shoes and a hard hat must

be used for the applicable

conditions. Wear heavy-duty work

gloves during use.

g. Always wear eye protec-

tion. Wear ANSI-ap-

proved safety goggles.

h. Always wear hearing

protection when using

the tool. Prolonged expo-

sure to high intensity noise

is able to cause hearing loss.

a. DANGER! Keep hands and body

away from cutting area and chisel.

Keep your second hand on aux-

iliary handle or motor housing.

Contact with the chisel could result in

serious injury.

b. Explore the workarea to avoid

contact with hidden wiring or pip-

ing. Thoroughly inspect the workarea

for possible hidden wiring or piping

before performing work. Contact with

live wiring will shock the operator.

Tool use and care

a. Use clamps or another practical

way to secure and support the

workpiece to a stable platform.

Holding the work by hand or against

the body is unstable and is able to

lead to loss of control.

b. Do not force the tool. Use the

correct tool for the application. The

correct tool will do the job better and

safer at the rate for which the tool is

designed.

c. Do not use the tool if the switch

does not turn the tool on or off.

Any tool that cannot be controlled

with the switch is dangerous and

must be repaired.

SKU 99792 For technical questions, please call 1-800-444-3353. Page 5

d. Disconnect the tool from the air

source before making any adjust-

ments, changing accessories, or

storing the tool. Such preventive

safety measures reduce the risk of

starting the tool unintentionally. Turn

off and detach the air supply, safely

discharge any residual air pressure,

and release the throttle and/or turn

the switch to its off position before

leaving the work area.

e. Store the tool when it is idle out of

reach of children and other un-

trained persons. A tool is dangerous

in the hands of untrained users.

f. Maintain the tool with care. Keep a

cutting tool sharp and clean. A prop-

erly maintained tool, with sharp cut-

ting edges reduces the risk of binding

and is easier to control.

g. Check for misalignment or bind-

ing of moving parts, breakage of

parts, and any other condition that

affects the tool’s operation. If dam-

aged, have the tool serviced before

using. Many accidents are caused

by poorly maintained tools. There is a

risk of bursting if the tool is damaged.

h. Use only accessories that are

identied by the manufacturer for

the specic tool model. Use of an

accessory not intended for use with

the specic tool model, increases the

risk of injury to persons.

Service

a. Tool service must be performed

only by qualied repair personnel.

b. When servicing a tool, use only

identical replacement parts. Use

only authorized parts.

c. Use only the lubricants supplied

with the tool or specied by the

manufacturer.

Air source

a. Never connect to an air

source that is capable of

exceeding 90 psi. Over

pressurizing the tool may

cause bursting, abnormal operation,

breakage of the tool or serious injury

to persons. Use only clean, dry,

regulated compressed air at the rated

pressure or within the rated pressure

range as marked on the tool. Always

verify prior to using the tool that the

air source has been adjusted to the

rated air pressure or within the rated

air-pressure range.

b. Never use oxygen, carbon dioxide,

combustible gases or any bottled

gas as an air source for the tool.

Such gases are capable of explosion

and serious injury to persons.

SAVE THESE

INSTRUCTIONS.

SYMBOLS AND

SPECIFIC SAFETY

INSTRUCTIONS

Symbol Denitions

Symbol Property or statement

noNo-load speed

.../min Revolutions or reciprocation per

minute

PSI Pounds per square inch of pressure

Chart continued in next column.

SKU 99792 For technical questions, please call 1-800-444-3353. Page 6

Symbol Denitions

Symbol Property or statement

ft-lb Foot-pounds of torque

BPM Blows per minute

CFM Cubic Feet per Minute ow

SCFM Cubic Feet per Minute ow at

standard conditions

NPT National pipe thread, tapered

NPS National pipe thread, straight

WARNING marking concerning Risk

of Eye Injury. Wear ANSI-approved

eye protection.

WARNING marking concerning Risk

of Hearing Loss. Wear hearing

protection.

WARNING marking concerning Risk

of Respiratory Injury. Wear NIOSH-

approved dust mask/respirator.

WARNING marking concerning Risk

of Explosion.

Specic Safety Instructions

1. Always disconnect tool from its com-

pressed air supply source before per-

forming any services or maintenance,

Such as cleaning the tool, moving to

a different work location, handing the

tool to another person, etc.

Caution: After disconnecting the TOOL

from the air compressor, the TOOL

may still be pressurized. Point the

TOOL onto an extra piece of work

surface and depress the trigger until

all pressure is released. Also:

a. Never use combustible gas as a

power source.

b. Never operate this tool at greater

than 90 PSI operating pressure.

Warning: People with pacemakers should

consult their physician(s) before us-

ing this product; operation of equip-

ment in close proximity to a heart

pacemaker could cause interference

or failure of the pacemaker.

2. Your risk from these exposures var-

ies, depending on how often you

do this type of work. To reduce your

exposure to these chemicals: work in

a well ventilated area, and work with

approved safety equipment, such as

those dust masks that are specially

designed to lter out microscopic

particles.

3. The warnings and precautions dis-

cussed in this manual cannot cover

all possible conditions and situations

that may occur. It must be under-

stood by the operator that common

sense and caution are factors which

cannot be built into this product, but

must be supplied by the operator.

4. WARNING: Some dust created by

power sanding, sawing, grinding, drill-

ing, and other construction activities,

contains chemicals known [to the

State of California] to cause cancer,

birth defects or other reproductive

harm. Some examples of these

chemicals are:

• Lead from lead-based paints

• Crystalline silica from bricks and

cement or other masonry products

• Arsenic and chromium from chemi-

cally treated lumber

Your risk from these exposures var-

ies, depending on how often you do

this type of work. To reduce your

exposure to these chemicals: work in

SKU 99792 For technical questions, please call 1-800-444-3353. Page 7

a well ventilated area, and work with

approved safety equipment, such as

those dust masks that are specially

designed to lter out microscopic

particles. (California Health & Safety

Code § 25249.5, et seq.)

WARNING: The brass components

of this product contain lead, a chemi-

cal known to the State of California

to cause birth defects (or other repro-

ductive harm). (California Health &

Safety code § 25249.5, et seq.)

5. Only use with accessories rated to

handle the forces exerted by this tool

during operation. Other accessories

not designed for the forces gener-

ated may break and forcefully launch

pieces.

6. Attach all accessories properly to the

tool before connecting the air sup-

ply. A loose accessory may detach or

break during operation.

7. Obey the manual for the air compres-

sor used to power this tool.

8. Install an in-line shutoff valve to allow

immediate control over the air supply

in an emergency, even if a hose is

ruptured.

9. Use this tool with both hands only.

Using tools with only one hand can

result in loss of control.

10. Do not lay the tool down until it has

come to a complete stop. Moving

parts can grab the surface and pull

the tool out of your control.

Vibration Precautions

This tool vibrates during use. Re-

peated or long-term exposure to vibra-

tion may cause temporary or permanent

physical injury, particularly to the hands,

arms and shoulders. To reduce the risk of

vibration-related injury:

1. Anyone using vibrating tools regu-

larly or for an extended period should

rst be examined by a doctor and

then have regular medical check-

ups to ensure medical problems are

not being caused or worsened from

use. Pregnant women or people

who have impaired blood circulation

to the hand, past hand injuries, ner-

vous system disorders, diabetes, or

Raynaud’s Disease should not use

this tool. If you feel any medical or

physical symptoms related to vibra-

tion (such as tingling, numbness, and

white or blue ngers), seek medical

advice as soon as possible.

2. Do not smoke during use. Nico-

tine reduces the blood supply to the

hands and ngers, increasing the risk

of vibration-related injury.

3. Wear suitable gloves to reduce the

vibration effects on the user.

4. Use tools with the lowest vibration

when there is a choice between dif-

ferent processes.

5. Include vibration-free periods each

work day.

6. Grip tool as lightly as possible (while

still keeping safe control of it). Let

the tool do the work.

7. To reduce vibration, maintain tool as

explained in this manual. If abnormal

vibration occurs, stop immediately.

SAVE THESE

INSTRUCTIONS.

SKU 99792 For technical questions, please call 1-800-444-3353. Page 8

FUNCTIONAL DESCRIPTION

Specications

Chipping Rate 1800 Blows per Minute

Chisel Shank Diameter 11/16"

Operating Pressure 90 PSI

Air Inlet 3/8" - 18 NPT

Air Consumption 20 CFM (Continuous)

10 CFM (Intermittent)

Overall Length 17"

Net Weight 17.5Lbs

* Maximum speed at stated maximum air pressure. Ex-

cess air pressure is hazardous and may cause the tool

to exceed stated maximum speed.

INITIAL TOOL SET UP/

ASSEMBLY

Read the ENTIRE IMPORTANT

SAFETY INFORMATION

section at the beginning of this

manual including all text under

subheadings therein before set

up or use of this product.

Note: For additional information regarding

the parts listed in the following pages,

refer to the Assembly Diagram near

the end of this manual.

Unpacking

When unpacking, make sure that

the item is intact and undamaged. If any

parts are missing or broken, please call

Harbor Freight Tools at the number shown

throughout the manual as soon as pos-

sible.

• This air tool may be shipped with a

protective plug covering the air inlet.

Remove this plug before set up.

Air Supply

TO PREVENT

EXPLOSION:

Use only clean, dry, regulated,

compressed air to power this

tool. Do not use oxygen,

carbon dioxide, combustible

gases, or any other bottled gas

as a power source for this tool.

1. Incorporate an in-line oiler, shut-off

valve, regulator with pressure gauge,

and lter for best service, as shown in

the diagram above. An in-line shut-

off valve is an important safety

device because it controls the air

supply even if the air hose is rup-

tured.

Note: If an automatic oiler system is not

used, add a few drops of Pneumatic

Tool Oil to the airline connection be-

fore operation. Add a few more drops

after each hour of continual use.

2. Attach an air hose to the compres-

sor’s air outlet. Connect the air hose

to the air inlet of the tool. Other com-

ponents, such as a connector and

SKU 99792 For technical questions, please call 1-800-444-3353. Page 9

quick coupler, will make operation

more efcient, but are not required.

WARNING! TO PREVENT SERIOUS

INJURY FROM ACCIDENTAL

OPERATION:

Do not install a female quick

coupler on the tool. Such a coupler

contains an air valve that will allow

the air tool to retain pressure and

operate accidentally after the air

supply is disconnected.

Note: Air ow, and therefore tool perfor-

mance, can be hindered by under-

sized air supply components.

3. The air hose must be long enough

to reach the work area with enough

extra length to allow free movement

while working.

4. Make sure the tool’s throttle or switch

is in the off position; refer to Opera-

tion section for description of con-

trols.

5. Close the in-line safety valve be-

tween the compressor and the tool.

6. Turn on the air compressor according

to the manufacturer’s directions and

allow it to build up pressure until it

cycles off.

7. Adjust the air compressor’s output

regulator so that the air output is

enough to properly power the tool,

but the output shall not exceed the

tool’s maximum air pressure at any

time. Adjust the pressure gradually,

while checking the air output gauge

to set the right pressure value.

8. Inspect the air connections for leaks.

Repair any leaks found.

9. If the tool will not be used at this

time, turn off and detach the air sup-

ply, safely discharge any residual air

pressure, and release the throttle

and/or turn the compressor switch to

its off position to prevent accidental

operation.

Installing a Chisel

Note: All part numbers refer to the As-

sembly Diagram and Parts List on

Pages 16 and 17.

Fig. 1

To install a Chisel (not included but

are offered exclusively from Harbor

Freight Tools), rst determine which

type of Chisel is appropriate for job at

hand.

a. For chipping in straight lines, you

should use a Flat Tip Chisel.

b. For breaking up concrete, use a

Pointed Tip Chisel.

2. As shown (see Fig. 1), using a wire or

screw driver or simply your ngers to

SKU 99792 For technical questions, please call 1-800-444-3353. Page 10

pull out the Lockcoil Spring (17) from

the Retaining Sleeve (16). This spring

is designed as a locking device. Then

remove the Retaining Sleeve (16)

from the hammer.

Fig. 2

Put the spring aside. Lubricate the

top edge of the chisel shank chamfer

with oil or light grease and then insert

the chisel from the ellipse opening of

the Retaining Sleeve (16). (See Fig.

2.)

4. During usage, the Retaining Sleeve

(16) ledge may be slightly elongated,

preventing insertion of the chisel into

the Retaining Sleeve. It may require

some force to get the Chisel’s lobes

past this point and to slide into the

chisel mounting channel.

Fig. 3

Turn the chisel 90º and let the ange

of the chisel rest on the bottom of the

ellipse slot as shown. (See Fig. 3.).

Fig. 4

Align the chisel shank to the hole on

the hammer’s Cylinder (18) and at-

tach the Chisel and Retaining Sleeve

to the hammer body as shown. (See

Fig. 4.)

7. There is an O-Ring (9) inside the

channel about half way down. The

chisel may stop here. Apply a little

more force to push the chisel past the

O-ring, and into the channel.

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