JET JCT-3620A Operating Instructions and Parts Manual

4-Bolt Chipping Hammer

#550620, JCT-3620
#550621, JCT-3621
#550622, JCT-3622
#550623, JCT-3623

Operation & Parts Manual

M-550620

Edition 4

11/2018

JET

427 New Sanford Road

LaVergne, TN 37086

Ph.: 800-274-6848

www.jettools.com

Copyright © 2017 JET

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Safety warnings

General air tool warnings

1. Read and understand this entire manual
before attempting assembly or operation.

2. Read and understand all warnings posted on
the tool and in this manual. Failure to comply
with all of these warnings may cause serious
injury.

3. Replace warning labels if they become
obscured or removed.

4. Do not use this tool for other than its intended
use. If used for other purposes, JET disclaims
any real or implied warranty and holds itself
harmless from any injury that may result from
that use.

5. Always wear ANSI Z87.1 approved safety
glasses or face shield while using this tool.
(Everyday eyeglasses only have impact
resistant lenses; they are not safety glasses.)

6. Wear ear protectors (plugs or muffs) if the
noise exceeds safe levels.

7. Wear gloves and protective clothing if
operation produces sparks or flying particles.
Gloves should be tight-fitting, without frayed
fingers or hanging threads. Keep hands and
body away from the working area of tool.

8. Do not operate an air tool continually at full
throttle without a work load on the tool.

9. The air tool must be properly lubricated before
operating.

10. Never start a percussion type air tool (chipper,
breaker, buster, etc.) without securing the
tooling in the retainer and placing the tip
against the work surface.

11. Do not operate air tool without its guards in
place. Do not modify the tool.

12. Do not operate this tool while tired or under
the influence of drugs, alcohol, or any
medication.

13. Adopt a comfortable posture with proper
balance, and maintain secure footing at all
times. Non-slip footwear or anti-skid floor
strips are recommended.

14. Do not wear loose clothing or jewelry. Confine
long hair.

15. Excessive air pressure and too much free
rotation may decrease life of the tool and may
cause a hazardous situation.

16. Check air hoses for wear, and keep them
away from heat and sharp edges. Repair or
replace damaged air hose immediately. Do
not carry tool by the air hose.

17. Air hose may cause tripping hazards; keep
hose away from traffic areas.

18. Do not use this tool near flammable objects,
or in potentially explosive environments. Do
not use near live electrical wires.

19. Do not use power tools in damp or wet
location, or expose them to rain. Keep work
area well lighted.

20. Do not leave a connected tool unattended.
When not in use, disconnect tool from air
source.

21. Shut off air supply and discharge any residual
pressure from tool before removing hose,
making adjustments, changing accessories,
or storing tool.

22. Make sure tool is switched off, and your finger
off the trigger, before connecting to air supply.

23. Remove adjusting keys and wrenches before
turning on tool.

24. Keep visitors a safe distance from the work
area. Keep children away.

JCT-3620 series Chipping Hammers

3

25. Give your work undivided attention. Looking
around, carrying on a conversation and
“horse-play” are careless acts that can result
in serious injury.

26. Do not force a tool or attachment to do a job
for which it was not designed. The right tool
will do the job better and more safely.

27. Repetitive motions and/or exposure to
constant vibration can be harmful to hands
and arms. Take frequent breaks and relax
hands during extended operation. Change
posture to avoid discomfort or fatigue.

28. Compressed air can be harmful if directed
toward sensitive areas of the body, and may
propel small particles caught in the air stream.
Exercise proper caution.

29. Use only recommended accessories;
improper accessories may be hazardous.

30. Maintain tools with care. Keep air tool clean
and oiled for best and safest performance.

31. Do not use combustible gases, carbon
dioxide, oxygen or any bottled gas as an air
source for the tool. These can present risk of
explosion and serious injury.

32. Do not lubricate the tool with combustible
liquids, such as kerosene, diesel or jet fuel.

33. Do not dispose of this tool with normal
household waste. Never dispose of the air tool
into fire.

Specific warnings for Chipping
Hammers

34. This chipping hammer is designed and
intended for use by properly trained and
experienced personnel only. If you are not
familiar with the proper and safe operation of
a chipping hammer, do not use until proper
training and knowledge have been obtained.

35. Make sure chisel has appropriate shank with
oval collar and dimensions for this chipping
hammer.

36. Always secure tool in retainer, and place end
of tool against workpiece before turning on
hammer.

37. Disconnect machine from air supply before
changing tooling.

38. Retainer must be properly installed with coil
spring to prevent tool ejection during
operation.

39. Always grip chipping hammer firmly with both
hands.

40. The inserted tool can become hot during
operation and cause burns if touched. Allow
tool to cool before attempting removal or
maintenance.

WARNING: This product can expose you

to chemicals including lead which is known to
the State of California to cause cancer and
birth defects or other reproductive harm. For
more information go to http://www.
p65warnings.ca. gov.

WARNING: Some dust, fumes and gases

created by power sanding, sawing, grinding,
drilling, welding and other construction
activities contain chemicals known to the State
of California to cause cancer and birth defects
or other reproductive harm. Some examples of
these chemicals are:

 lead from lead based paint
 crystalline silica from bricks, cement and

other masonry products

 arsenic and chromium from chemically

treated lumber
Your risk of exposure varies, 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 dust masks that are
specifically designed to filter out microscopic
particles. For more information go to
http://www.p65warnings.ca.gov/ and http://
www.p65warnings.ca.gov/wood.

JET

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Familiarize yourself with the following safety notices used in this manual:

fatal, injury.

possible tool damage.

This means that if precautions are not heeded, it may result in serious, or even

This means that if precautions are not heeded, it may result in minor injury and/or

About this manual

This manual is provided by JET, covering the safe operation and maintenance procedures for the JET Model
JCT-3620 series pneumatic Chipping Hammers. These tools are designed for light demolition such as
concrete and masonry removal. This manual contains instructions on safety precautions, general operating
procedures, maintenance procedures and parts breakdown. Your tool has been designed and constructed
to provide consistent, long-term operation if used in accordance with the instructions set forth in this
document.

The instructions and warnings in this manual may not encompass all possible workplace environments. The
operator is expected to take appropriate precautions and exercise common sense. As with any tool
operation, safety of operator and bystanders should be first priority.

If there are questions or comments, please contact your local supplier or JET. JET can also be reached at
our web site: www.jettools.com.

Record the serial number and purchase information of your tool on the cover of this manual for quick access.
Retain this manual for future reference. If the tool transfers ownership, the manual should accompany it.

Register your product online -

http://www.jettools.com/us/en/service-and-support/warranty/registration/

JCT-3620 series Chipping Hammers

5

Tool specifications

Model number JCT-3620 JCT-3621 JCT-3622 JCT-3623

Stock number 550620 550621 550622 550623

Shank bushing style Round Hex Round Hex

Shank bushing size 0.680 in. 0.580 in. 0.680 in. 0.580 in.

Stroke length 3-1/32 in. 3-1/32 in. 4-1/64 in. 4-1/64 in.

Bore size 1-1/8 in. 1-1/8 in. 1-1/8 in. 1-1/8 in.

Impact rate (blows per
minute)

Average air consumption 34 CFM 34 CFM 34 CFM 34 CFM

Air Inlet 3/8 in. NPT 3/8 in. NPT 3/8 in. NPT 3/8 in. NPT

Air hose minimum inside
diameter

Required air pressure 90 psi (6.2 bar) 90 psi (6.2 bar) 90 psi (6.2 bar) 90 psi (6.2 bar)

Energy per blow @90psi 22.9 Joule 22.9 Joule 30.46 Joule 30.46 Joule

Vibration value 15 m/s2 15 m/s2 26 m/s2 26 m/s2

Noise level 1 95 dB(A) 95 dB(A) 98 dB(A) 98 dB(A)

Speed settings Variable throttle Variable throttle Variable throttle Variable throttle

Overall length 14 in. (356 mm) 14 in. (356 mm)

Housing material steel steel steel steel

Net weight 18 lb. (8.2 kg) 18 lb. (8.2 kg) 20 lb. (9 kg) 20 lb. (9 kg)

Shipping weight 21 lb. (9.5 kg) 21 lb. (9.5 kg) 23 lb. (10.4 kg) 23 lb. (10.4 kg)

2,200 2,200 1,500 1,500

1/2 in. 1/2 in. 1/2 in. 1/2 in.

16-1/2 in. (419mm) 16-1/2 in. (419mm)

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The specified values are emission levels and are not necessarily to be seen as safe operating levels. As
workplace conditions vary, this information is intended to allow the user to make a better estimation of the
hazards and risks involved only.

Specifications were current at time of publication, but because of our policy of continuous improvement, JET
reserves the right to change specifications at any time and without prior notice, without incurring obligations.

JET