Central Pneumatic 68426, 68427, 68428, Earth Quake 68426, Earth Quake 68427 User Manual
...
Read this material before using this product. Failure to do
so can result in serious injury. SAVE THIS MANUAL.
When unpacking, make sure that the product is intact and undamaged.
If any parts are missing or broken, please call 1-800-444-3353 as soon as possible.
Visit our website at: http://www.harborfreight.com
Copyright© 2011 by Harbor Freight Tools®. All rights reserved. No portion of this manual or any artwork 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.
68427 1/2” Air Wrench
68426 3/8” Air Wrench
Professional Air Ratchet Wrench
68428 1/4” Air Wrench
Page 2 For technical questions, please call 1-800-444-3353. Air Ratchets
Save This Manual
Keep this manual for the safety warnings and
precautions, assembly, operating, 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 provided 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 precautions
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 using 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 explosive 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 tool. Distractions are able
to result in the loss of control of the tool.
Personal Safety
a. Stay alert. Watch what you are doing and
use common sense when operating the tool.
Do not use the tool while tired or under the
inuence of drugs, alcohol, or medication.
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 connecting 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 attached 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.
Page 3For technical questions, please call 1-800-444-3353.Air Ratchets
Proper footing and balance enables better
control of the tool in unexpected 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 protection.
Wear ANSI-approved safety goggles.
h. Always wear hearing protection when
using the tool. Prolonged exposure to
high intensity noise is able to cause
hearing loss.
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.
d. Disconnect the tool from the air source
before making any adjustments, 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 untrained persons.
A tool is dangerous in the hands of untrained users.
f. Maintain the tool with care. A properly
maintained tool is easier to control.
g. Check for misalignment or binding of moving
parts, breakage of parts, and any other condition
that affects the tool’s operation. If damaged,
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 identied by the
manufacturer for the specic tool model. Use of
an accessory not intended for use with the specic
tool model, increases the risk of injury to persons.
Service
a. Tool service must be performed only
by qualied 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 specied by the manufacturer.
Air Source
a. Never connect to an air source that is
capable of exceeding 200 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 Specic
Safety Instructions
Symbol Denitions
Symbol Property or statement
n
o
No-load speed
.../min
Revolutions or reciprocation per minute
PSI
Pounds per square inch of pressure
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
Chart continued in next column.
Page 4 For technical questions, please call 1-800-444-3353. Air Ratchets
Symbol Property or statement
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.
Specic Safety Instructions
1. The warnings and precautions discussed in this
manual cannot cover all possible conditions and
situations that may occur. It must be understood
by the operator that common sense and caution
are factors which cannot be built into this
product, but must be supplied by the operator.
2. WARNING: The brass components of
this product contain lead, a chemical
known to the State of California to cause
birth defects (or other reproductive harm).
(California Health & Safety code § 25249.5, et seq.)
3. Only use with accessories rated to handle the
forces exerted by this tool during operation.
Other accessories not designed for the forces
generated may break and forcefully launch pieces.
4. Attach all accessories properly to the tool before
connecting the air supply. A loose accessory
may detach or break during operation.
5. Obey the manual for the air compressor
used to power this tool.
6. Install an in-line shutoff valve to allow
immediate control over the air supply in an
emergency, even if a hose is ruptured.
7. Use this tool with both hands only. Using tools
with only one hand can result in loss of control.
8. 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.
9. Do not force the tool. Use a larger one if needed.
10. Do not use an extension on the tool to increase force.
Vibration Precautions
This tool vibrates during use. Repeated or long-term
exposure to vibration 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 regularly 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, nervous system disorders,
diabetes, or Raynaud’s Disease should not use this
tool. If you feel any symptoms related to vibration
(such as tingling, numbness, and white or blue
ngers), seek medical advice as soon as possible.
2. Do not smoke during use. Nicotine 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.
5. Include vibration-free periods each day of work.
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.
Page 5For technical questions, please call 1-800-444-3353.Air Ratchets
Functional Description
Specications
Max. Air Pressure 90 PSI
Air Inlet 1/4” -18 NPT
Maximum Torque
68428 1/4” Air Ratchet
68426 3/8” Air Ratchet
68427 1/2” Air Ratchet
40 ft.-lb.
70 ft-lb.
75 ft.-lb.
Average Air
Consumption
4 CFM @ 90 PSI
* Maximum torque is stated maximum air
pressure. Excess air pressure is hazardous and
may cause tool failure or personal injury.
Components and Controls
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
1-800-444-3353 as soon as possible.
• This air tool may be shipped with a
protective plug covering the air inlet.
Remove this plug before set up.
Air Supply
TO PREVENT SERIOUS INJURY
FROM 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. Verify compressor is not running during setup. Then
incorporate a lter, regulator with pressure gauge,
oiler, in-line shutoff valve, and quick coupler for
best service, as shown on Figure A on page 6
and Figure B on page 7. An in-line shutoff
ball valve is an important safety device because
it controls the air supply even if the air hose
is ruptured. The shutoff valve should be a
ball valve because it can be closed quickly.
Note: If an automatic oiler system is not
used, add a few drops of Pneumatic Tool Oil to
the air inlet before operation. Add a few more
drops after each hour of continual use.
2. Attach an air hose to the compressor’s air outlet.
Connect the air hose to the air inlet of the tool.
Other components, such as a quick connect
plug and quick connect coupler, will make
operation more efcient, but are not required.
WARNING! TO PREVENT SERIOUS INJURY
FROM ACCIDENTAL OPERATION:
Do not install a 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 performance, can
be hindered by undersized 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. Turn the tool’s throttle or switch to the off position;
refer to Operation section for description of controls.
5. Turn on the air compressor according to
the manufacturer’s directions and allow it
to build up pressure until it cycles off.
6. Adjust the air compressor’s output regulator so
that the air output is enough to properly power
the tool, but the output will 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 range.
Throttle
Lever
Air Inlet
Anvil
Direction
Lever
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