Pneumatic Paving Breaker
#550660, JCT-4660
#550661, JCT-4661
Operation & Parts Manual
M-550660
Edition 2
05/2017
JET
427 New Sanford Road
LaVergne, TN 37086
Ph.: 800-274-6848
www.jettools.com
Copyright © 2017 JET
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 c ause 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 m ay 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 particl es.
Gloves should be tight-fitting, without frayed
fingers or hanging threads. Keep hands and
body away from the working area of tool.
8. Some dust created by power sanding, sawing,
grinding, drilling and other construction
activities contains chemic als known to cause
cancer, 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 face or dust masks
that are specifically designed to filter out
microscopic particles.
9. Do not operate an air tool continually at full
throttle without a work load on the tool.
10. The air tool must be properly lubricated before
operating.
11. 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.
12. Do not operate air tool without its guards in
place. Do not modify the tool.
13. Do not operate this tool while tired or under
the influence of drugs, alcohol, or any
medication.
14. Adopt a comfortable posture with proper
balance, and maintain secure footing at all
times. Non-slip footwear or anti-skid floor
strips are recommended.
15. Do not w ear loose clothing or jewelry. Confine
long hair.
16. Excessive air pressure and too much free
rotation may decrease life of the tool and may
cause a hazardous situation.
17. 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.
18. Air hose may cause tripping hazards; keep
hose away from traffic areas.
19. Do not use this tool near flammable objects,
or in potentially explosive environments. Do
not use near live electrical wires.
2
JCT-4660 series Paving Breaker
20. Do not use power tools in damp or wet
location, or expose them to rain. Keep work
area well lighted.
21. Do not leave a connected tool unattended.
When not in use, disconnect tool from air
source.
31. Maintain tools with c are. Keep air tool clean
and oiled for best and safest performance.
32. 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.
22. Shut off air supply and discharge any residual
pressure from tool before removing hose,
making adjustments, changing accessories,
or storing tool.
23. M ake sure tool is switched off, and your finger
off the trigger, before connecting to air supply.
24. Remove adjusting keys and wrenches before
turning on tool.
25. Keep visitors a safe distance from the work
area. Keep children away.
26. Give your work undivided attention. Looking
around, carrying on a conversation and
“horse-play” are careless acts that can result
in serious injury.
27. 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.
28. 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.
29. Compressed air can be harmful if directed
toward sensitive areas of t he body, and may
propel small particles caught in the air stream.
Exercise proper caution.
30. Use only recommended accessories;
improper accessories may be hazardous.
33. Do not lubricate the tool with combustible
liquids, such as kerosene, diesel or jet fuel.
34. Do not dispose of this tool with normal
household waste. Never dispose of the air tool
into fire.
Specific warnings for Paving Breaker
35. This paving breaker 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 pneumatic
paving breaker, do not use until proper
training and knowledge have been obtained.
36. Use only correct steels with sharp cutting
edge. Make sure steel is securely latched in
paving breaker before pressing throttle lever.
37. Disconnect machine from air supply before
changing tooling.
38. Always hold cutting tool down firmly on the
work surface before pressing throttle lever.
39. Always grip paving breaker firmly with both
hands.
40. Apply enough downward pressure to prevent
tool from bouncing or skipping which can lead
to personal injury and tool damage.
41. Direct tool exhaust away from yourself and
others.
Familiarize yourself with the following safety notices used in this manual:
This means that if precautions are not heeded, it may result in serious, or even
fatal, injury.
This means that if precautions are not heeded, it may result in minor injury and/or
possible tool damage.
JET
3
About this manual
This manual is provided by JET, covering the safe operation and maintenance procedures for the JET Model
JCT-4660 series pneumatic Paving Breakers. 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-t erm operation if used in accordance with the instructions s et
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/
4
JCT-4660 series Paving Breaker
Tool specifications
Model number JCT-4660 JCT-4661
Stock number 550660 550661
Class/type 60 lb. 90 lb.
Hex shank size 1-1/8 x 6 in. 1-1/8 x 6 in.
Piston diameter 2-1/4 in. 2-5/8 in.
Piston stroke 4 in. 6 in.
Impact rate (blows per minute) 1,400 1,250
Energy per blow @ 90 psi 119.32 Joule 248.36 Joul e
Average air consumption 70 CFM 77 CFM
Air Inlet 3/4 in. NPT 3/4 in. NPT
Air hose minimum inside diameter 3/4 in. 3/4 in.
Required air pressure 90 psi (6.2 bar) 90 psi (6.2 bar)
Vibration value 15.6 m/s2 17.3 m/s2
Noise level 1 108 dB(A) 110 dB(A)
Overall length 36.5 in. (927mm) 29.6 in. (751.8mm)
Housing material steel steel
Oil reservoir capacity 18 cc 36 cc
Net weight 66 lb. (30 kg) 92.4 lb. (42 kg)
Shipping weight 70 lb. (31.8 kg) 98 lb. (44.5 kg)
1
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
5
Setup and Assembly
Any missing parts or damage should be reported
immediately to your JET
damaged tool. Read this instruction manual
thoroughly for operation, maintenance and s afety
instructions.
Box contents:
1 Paving Breaker
1 Operation and parts manual
1 Warranty card
®
distributor. Do not use a
Operation
The paving breaker must be
properly lubricated before operation.
2. Remove oil plug and fill reservoir with air tool
oil up to lowest thread of fill hole. NOTE: Air
tool oil not provided; it is available at most
major hardware and tool stores. SAE #10 oil
may be used as a substitute. Do not use
detergent oil.
3. Reinstall plug. The oil control plug (#4, page
14; #3 page 16) can be turned to regulate
flow through the tool.
4. Remove protective cap from air inlet. Blow
out air line to remove any dirt or moisture,
then connect air supply hose t o tool. Set air
pressure to 90 psi.
IMPORTANT: Connecting a quick-change
coupling directly to the tool is not
recommended, as vibration may cause the
connection to fail. Instead, add a leader hose
and install any quick-change couplings
farther down the line.
5. Use both hands on grips, and place steel in
contact with work surface.
Figure 1 (JCT-4661 shown)
1. Pull down on retainer (Figure 1) to insert
steel (not provided). Apply greas e to shank
of steel before insertion. Push up on retainer
to secure steel, then tug on steel to ensure it
is properly caught in the bushing.
Note: When installing a chisel, blade should
be parallel with handles on breaker.
6. Push stop lever inward to release throttle
lever. Press and hold throttle lever. Rel ease
throttle lever to stop.
Apply constant pressure to work surface to
prevent as much recoil as possible. Release
throttle lever after breaking through the work, and
when removing tool from the work.
Important: Do NOT raise air pressure above
maximum rating for this paving breaker. If tool is
not accomplishing task at maximum air pressure
and flow, use a larger tool or different means to
achieve task.
When finished operating this tool, turn off air
supply and bleed residual air by pressing throttle
lever briefly. Disconnect air hose.
User-maintenance
Inspect paving breaker before each use. Ensure
that steel is secured inside retainer. After use,
wipe down the tool with a rag. Periodically apply
light coat of oil to exposed metal surfaces to inhibit
rust.
Periodically check torque of bolts in front and back
head. Loose bolts can result in loss of power and
tool damage. See “Torque specifications.”
6
JCT-4660 series Paving Breaker
Lubrication
5. Remove cylinder, tappet seat, and tappet.
The paving breaker should be lubricated with air
tool oil maintained in the reservoir, and with an inline oiler.
Storage
Avoid storing the paving breaker in very humid
locations which promotes rusting of internal
mechanisms. Always oil t he tool and disconnect
air hose before storage.
Air system requirements
1. Use proper air hose size (refer to tool
specifications). The hose should be just long
enough to serve the working area. Excessive
hose length will cause pressure drop.
1. Make sure air compressor supplies clean,
dry air at correct CFM for the tool.
2. Set air press ure t o 90 psi.
Excess air pressure
and/or unclean air will shorten the tool’s
life and may create a hazardous situation.
3. Drai n water from air compressor tank daily,
as well as any condensation from air lines.
Water in the air line may ent er the tool and
cause damage.
4. Change filters on the air system on a regular
basis.
5. Air-line pressure may be increased
accordingly to compensate for extra-long air
hoses (usually over 25 feet). Inside diameter
of hose should be minimum 3/4-inch.
Disassembly
Disassembly and reassembly
should be performed by qualified personnel.
Refer to parts exploded view as needed.
1. Disconnect air tool from air system.
2. Loosen the back head bolt nuts, rem ove the
lock washer, and back head bolt nuts.
3. Remove back head from cylinder and
remove throttle valve, throttle valve spring,
plunger, and plunger spring.
6. Dis assemble front head:
• Loosen the steel retainer bolt nut.
• Remove steel retainer bolts, steel
retainer, and retainer bolt bushings.
• Remove steel retainer plunger and
retainer spring.
• Remove front head bushing from front
head by pressing it out from the backside
using a 15-ton press.
7. Dis assemble back head:
• Remove the two throttle lever pins and
release the throttle lever.
• Using a pres s and a 0.37” (9.4mm) pin,
remove throttle valve stem guide from
back head.
• Remove the 5/8” oil control plug from
back head and take out the oil control felt.
8. Disassemble air inlet:
• Loosen air inlet swivel nut and remove it
from cylinder.
• Remove air inlet swivel.
• Remove air inlet screen from cylinder.
• Remove O-ring(s) from air inlet swivel nut
and air inlet swivel.
Reassembly
Front head assembly
1. Using a 15-ton press, press the front head
bushing into place. A hex flat must align with
the front head steel retainer.
2. Assemble the st eel ret ainer spring and s teel
retainer plunger into the front head.
3. Assemble the steel retainer bolt bushings on
each side of the front head. Set the retainer
into the retainer slot. To support the retainer,
insert the retainer bolt through the bushi ngs
from the stopper side of the front head.
4. Place the 3/4” nut and washer on the bolt.
See the torque specifications chart for the
torque setting.
4. Remove valve guide, valve, valve chest,
valve seat, valve chest dowel pin, and piston.
JET
7
Back head assembly
7. Install five cylinder plugs into cylinder.
1. Place chamfered side of throttle valve stem
guide into the back head and tap into
position.
2. Ream the guide with a 0.312” (7.93 mm)
reamer tool.
3. Set throt tl e val ve lever into the back head.
4. Place a 0.312” (7.93 mm) steel rod into the
hole and hammer in the pin.
5. Apply a l i ght film of grease on rubber handle
and slide onto handle.
6. Assemble the plugs on both sides of back
head. See torque specifications chart for the
torque setting.
7. P lace throttle valve o-ring in position where
the cylinder will meet.
8. Insert oil control felt onto top portion of back
head and assemble the oil control plug.
Air inlet assembly
1. P lace the #P91222 O-ring onto the air inlet
swivel.
2. P lace the #P91237 O-ring onto the air inlet
swivel nut.
3. Assemble air inlet swivel into air inlet swivel
nut and tighten nut.
Completing assembly
8. S et air inlet screen into the exhaust portion
of cylinder.
9. Install air inlet assembly. See torque
specification chart.
10. Place throttle valve spring onto throttle valve
and install into cylinder.
11. Lightl y grease the inner diameter of plunger,
insert plunger spring, and place on top of
valve guide.
12. P lace back head on top of cylinder and put
back head bolts from underneath into the
four holes.
13. Assemble lock washer and fa sten back head
bolt nuts. See torque specification chart for
bolt tightness.
14. Assemble back head with l ever in line with
cylinder exhaust port.
15. Remove oil fill plug in the back head and refill
spindle oil tank.
16. Tighten oil tank plug. See torque
specification chart.
Before operating a newly rebuilt tool, pour a few
ounces of air tool oil into air inlet. Also, allow a
break-in period for the tool by running it at reduced
air pressure for a short tim e until proper function
is confirmed.
1. Stand the front head assembly in vertical
position.
2. Assemble tappet seat and cylinder onto front
head, making sure the retainer nut and
exhaust port on cylinder are in line with each
other.
3. Place the front head bolts into the holes.
4. Assemble front head bolt springs, front head
lock washer, and tighten front head bolt nut.
A minimum of three bolt threads should be
visible.
5. Assemble valve seat, valve, valve chest, and
valve guide into cylinder. Note: Valve chest
and valve guide must align with knock
placement. The valve has no orientation.
6. Inst al l valve chest dowel pin.
8
JCT-4660 series Paving Breaker
General Air Tool
Information
If the air tool is not performing according to
specifications, the following are among the most
common causes. (See also “Troubleshooting”
section.)
Use safety shut-off valves so air flow can be
stopped quickly in case of a line break.
When using multiple hoses, air hoses should be
larger than leader hose. Join multiple hoses
directly, rather than with quick connect fittings
which may cause pressure drops and tool power
reduction.
• Contaminated air such as a dirty air system
or water in the system.
• Using wrong size tool for the job.
• Poor maintenance practices, such as using
excessive air pressure or air volum e.
• Improper or no lubrication.
Rule of Thumb
If it takes more than 8 seconds to tighten or loosen
a bolt or nut with an air impact wrench at
maximum setting, the air wrench is too small or
the air compressor CFM is not powerful enough
for the job. Continued use in either capacity will
cause damage to the tool.
Tool Pressure
JET Air Tools operate on 70-to-100 psi (pounds
per square inch) air pressure measured at the tool
when the tool is operating. Set tool to 90 psi
unless indicated otherwise. Pressure in excess of
100 psi will shorten the life of the tool.
Air System Recommenda tio ns
Use anti-whip devices across hose couplings to
prevent hose from whipping in the event of a hose
failure or coupling disconnect.
Always use m oisture traps at the compressor f or
the main distribution line. Use m oisture t raps and
in-line oilers on each downline that is to be used
for air tools. (See Figure 2). Place oiler as close to
air tool as possible for best lubrication.
Lubrication
Use a light oil containing rust i nhibitors, such as
SAE #10. Many JET air tools have integral oil
reservoirs, which should be kept filled when in-line
oilers are not used.
If greasing is required, use a grease that is hi ghl y
water resistant for front case components on air
impact wrenches, grinders and sanders.
Recycling
Protect the environment. Your tool contains
materials which can be recovered or recycled.
When its useful life has expired, please leave tool
at a specialized facility
Equip the air compressor intake with a
replaceable air filter that can be easily cleaned.
JET
9
Figure 2
Recommended arrangement of air piping and air line system
Torque specifications
Refer to this chart when assembling parts or tightening after a period of service.
Front Head Bolt 2-2.5mm * 3mm *
Back Head Bolt 166.3-202.5 166. 3-202.5
Front Retainer Bolt 43.4-57.8 43.4-57.8
Oil Tank Bolt 57.8 28.9-32.5
GD Plug 7.2-10.8 10.8-14.5
Air Inlet Assembly 202.58-216. 9 202.5-216.9
* torque setting for the front head bolt is given as the measurement between the bottom of the nut and the
end of the bolt, as shown:
JCT-4660 JCT-4661
Figure 3
Troubleshooting JCT-4660 series Paving Breakers
Any disassembly of the tool should be done by qualified service personnel. For problems not addressed
below, contact JET technical service at 800-274-6846.
Problem Possible cause Remedy
Tool will not start. Air valve closed or obstructed. Open valve; clear any obstructions.
Starts immediately as soon
as air is connected without
lever being pressed.
Excessive or abnormal
vibration.
Loss of power; erratic
action.
Dirt or gum deposits on
components.
Throttle lever malfunction. Clean throttle lever mechanism to
Piston seized due to improper
lubrication.
Throttle valve malfunction. Inspect and repair throttle valve.
Improper lubrication. Lubricate properly according to
Low air pressure or air volume. Verify compressor has proper CFM
Moisture or obstruction in air
hose.
Improper size of air transmission
lines, hoses, fittings, or
couplings. Or, air supply line too
long.
Dirt or gum deposits on
components.
Front head bushing excessively
worn.
Loose bolts in front or back head. Tight en bolts.
Loss of impact, or loss of blows
per minute.
Throttle valve seizing. Inspect; clean or replace elements.
Flush tool with gum solvent.
If problem persists, disassemble,
clean and lubricate internal parts.
ensure free movement. Replace
mechanism if needed.
Lubricate breaker according to
instructions.
instructions in this manual.
rating for tool.
Check compressor regulator
setting; set air pressure to 90 psi.
Check for loose connections at air
inlet, o-rings, etc.
Air supply must be clean and dry.
Clean out air hose(s) and remove
any kinks or bends.
Use appropriate-sized air lines/
hoses. Verify proper fittings,
couplings. Use shorter supply line if
needed.
Flush tool with gum solvent.
Check and clean air filter on
compres so r .
Clean external areas of tool. If
problem persists, disassemble,
clean and lubricate internal parts.
Replace front head bushing.
Check clearance between piston
and cylinder. Maximum clearance
should be 0.005 in. (0.13mm).
Check that piston moves freely and
is not seized.
JET
11
Problem Possible cause Remedy
Severe air leakage.
(Note: Minimal escape of
air is often normal for air
tools.)
Excessive heat develops
in tool.
Tool continues to operate
after releasing throttle
lever.
Steel tool is loose. Steel shank does not match
Steel retainer latch refuses
to catch.
Leakage from air inlet swivel. Change O-rings and check for
Leakage from throttle valve area. Check for wear of throttle valve
Leakage from back head and
cylinder.
Improper lubrication. Lubricate properly according to
Worn internal parts. Inspect and replace as needed.
Throttle valve seat is damaged. Replace valve seat.
Blockage in valve area. Remove any foreign matter.
retainer bushing.
Front head bushing is worn. Replace bushing.
Excessive wear of retainer. Replace parts as needed.
Excessive wear of retainer
plunger and spring.
loosening of air inlet swivel nut.
stem guide. Replace if needed.
Check plug; change O-ring on
throttle valve. Also check for
foreign matter which may have
entered during assembly.
instructions in this manual.
Use steel with correct shank type.
Replace parts as needed.
12
JCT-4660 series Paving Breaker
Replacement parts
Service parts are listed on the following pages. To order parts or reach our service department, call 1-800274-6848 Monday through Friday, 8:00 a.m. to 5:00 p.m. CST. Please have the s tock number and serial
number of your tool available when you call, so that we may serve you quickl y and acc uratel y.
Non-proprietary parts, such as fasteners , can be found at local hardware stores, or may be ordered from
JET.
Some parts are shown for reference only, and may not be available individually.
JET
13
#550660, JCT-4660 Paving Breaker (60 lb.)
14
JCT-4660 series Paving Breaker
#550660, JCT-4660 Paving Breaker (60 lb.)
Index Part No. Description Qty
1 P61119 Oil plug 1
2 JCT4660-02 Back head 1
3 P91245 Felt oiler Ø8.5x25L 1
4 P91220 Oil control plug 1/8PT 1
5 P91217 Throttle lever 1
6 P91250 Spring pin 4x40L 1
7 P91252 Stop lever spring 1
8 P91251 Stop lever 1
9 P91218 Throttle lever pin Ø8x30L 2
10 P91213 Rubber grip 2
11 P91225 Back head bolt nut 4
12 P91224 Lock washer 5/8in. 4
13 P91210 Plunger spring 1
14 P91209 Plunger 1
15 P61107 Valve guide 1
16 P61105 Valve chest 1
17 P91204 Automatic valve 1
18 P61106 Valve seat 1
19 P91215 Throttle valve stem guide 1
20 P91212 O-ring 21.7x3.5mm 1
21 P91214 Throttle valve 1
22 P91216 Throttle valve spring 1
23 P91202 Cylinder plug 3
24 P91208
25 JCT4660-25 Cylinder 1
Valve che st d ow e l pin
Ø1/4x20L
1
Inde x Par t N o. Desc r iptio n Qty
26 P91238 Air inlet screen 1
27 P91222
28 P91235 Air inlet swivel 1
29 P91237 O-ring 29.4x3.1mm 1
30 P91236 Air inlet swivel nut 1
31 P91246 Rubber cap 1
32 P61123 Back head bolt 4
33 P61139 Front head bolt 2
34 P91244 Rubber plug 1
35 P61103 Piston hammer 1
36 JCT4660-36 Tappet seat 1
37 P61127 Tappet 1
38 P61143 Front head bushing 1
39 JCT4660-39 Front head 1
40 P91242 Front head bolt spring 2
41 P91241 Front head bolt lock washer 2
42 P91240 Front head bolt nut 2
43 P91229 Steel retainer bolt 1
44 P91232 Steel retainer bolt bushing 2
45 P91231 Lock washer 3/4in. 1
46 P91230
47 P91234 Steel retainer spring 1
48 P91233 Steel retainer plunger 1
49 P91228 Steel retainer 1
Air inlet swi vel o-r ing
28.5x2mm
Steel retainer bolt nut, 3/416UNF
1
1
JCT4660-RPK, Repair Kit, contains #19,20,21,22
JCT4660-RBK, Rebuild Kit, contains #13,14,15,17,35
JET
15
#550661, JCT-4661 Paving Breaker (90 lb.)
16
JCT-4660 series Paving Breaker
#550661, JCT-4661 Paving Breaker (90 lb.)
Index Part No. Description Qty
1 P91213 Rubber grip 2
2 JCT4661-02 Back head 1
3 P91220 Oil control plug 1/8PT 1
4 P91245 Felt oiler Ø8.5x25L 1
5 P91217 Throttle lever 1
6 P91250 Spring pin 4x40L 1
7 P91251 Stop lever 1
8 P91252 Stop lever spring 1
9 P91218 Throttle lever pin Ø8x30L 2
10 P91248 Oil tank plug 1/2PT 2
11 P91225 Back head bolt nut 4
12 P91224 Lock washer 5/8in. 4
13 P91219 Oil Plug 1
14 P91210 Plunger spring 1
15 P91209 Plunger 1
16 P91208
17 P91207 Valve guide 1
18 P91205 Valve chest 1
19 P91204 Automatic valve 1
20 P91206 Valve seat 1
21 P91215 Throttle valve stem guide 1
22 P91212 O-ring 21.7x3.5mm 1
23 P91214 Throttle valve 1
24 P91216 Throttle valve spring 1
25 P91202 Cylinder plug 5
26 JCT4661-26 Cylinder 1
Valve che st d ow e l pin
Ø1/4x20L
1
Inde x Par t N o. Desc r iptio n Qty
27 P91238 Air inlet screen 1
28 P91222
29 P91235 Air inlet swivel 1
30 P91237 O-ring 29.4x3.1mm 1
31 P91236 Air inlet swivel nut 1
32 P91246 Rubber cap 1
33 P91223 Back head bolt 4
34 P91239 Front head bolt 2
35 P91244 Rubber plug 1
36 P91203 Piston hammer 1
37 JCT4661-37 Tappet seat 1
38 P91227 Tappet 1
39 P61143 Front head bushing 1
40 JCT4661-40 Front head 1
41 P91242 Front head bolt spring 2
42 P91241 Front head bolt lock washer 2
43 P91240 Front head bolt nut 2
44 P91229 Steel retainer bolt 1
45 P91232 Steel retainer bolt bushing 2
46 P91231 Lock washer 3/4in. 1
47 P91230
48 P91234 Steel retainer spring 1
49 P91233 Steel retainer plunger 1
50 P91228 Steel retainer 1
Air inlet swi vel o-r ing
28.5x2mm
Steel retainer bolt nut,
3/4-16UNF
1
1
JCT4660-RPK, Repair Kit, contains #21,22,23,24
JCT4661-RBK, Rebuild Kit, contains #14,15,16,17,19,36
JET
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Warranty and Service
JET warrants every product it sells against manufacturers’ defects. If one of our tools needs service or repair, please contact
Technical Service by calling 1-800-274-6846, 8AM to 5PM CST, Monday through Friday.
Warranty Period
The general warranty lasts for the time period specified in the literature included with your product or on the official JET branded
website.
• JET products carry a limited warranty which varies in duration based upon the product. (See chart below)
• Accessories carry a limited warranty of one year from the date of receipt.
• Consumable items are defined as expendable parts or accessories expected to become inoperable within a
reasonable amount of use and are covered by a 90 day limited warranty against manufacturer’s defects.
Who is Covered
This warranty covers only the initial purchaser of the product from the date of delivery.
What is Covered
This warranty covers any defects in workmanship or materials subject to the limitations stated below. This warranty does not cover
failures due directly or indirectly to misuse, abuse, negligence or accidents, normal wear-and-tear, improper repair, alterations or
lack of maintenance. JET woodworking machinery is designed to be used with Wood. Use of these machines in the processing of
metal, plastics, or other materials outside recommended guidelines, may void the warranty. The exceptions are acrylics and other
natural items that are made specifically for wood turning.
Warranty Limitations
Woodworking products with a Five Year Warranty that are used for commercial or industrial purposes default to a Two Year
Warranty. Please contact Technical Service at 1-800-274-6846 for further clarification.
How to Get Technical Support
Please contact Technical Service by calling 1-800-274-6846. Please note that you will be asked to provide proof of initial
purchase when calling. If a product requires further inspection, the Technical Service representative will explain and assist with
any additional action needed. JET has Authorized Service Centers located throughout the United States. For the name of an
Authorized Service Center in your area call 1-800-274-6846 or use the Service Center Locator on the JET website.
More Information
JET is constantly adding new products. For complete, up-to-date product information, check with your local distributor or visit the
JET website.
How State Law Applies
This warranty gives you specific legal rights, subject to applicable state law.
Limitations on This Warranty
JET LIMITS ALL IMPLIED WARRANTIES TO THE PERIOD OF THE LIMITED WARRANTY FOR EACH PRODUCT. EXCEPT AS
STATED HEREIN, ANY IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
EXCLUDED. SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG AN IMPLIED WARRANTY LASTS, SO THE
ABOVE LIMITATION MAY NOT APPLY TO YOU.
JET SHALL IN NO EVENT BE LIABLE FOR DEATH, INJURIES TO PERSONS OR PROPERTY, OR FOR INCIDENTAL,
CONTINGENT, SPECIAL, OR CONSEQUENTIAL DAMAGES ARISING FROM THE USE OF OUR PRODUCTS. SOME STATES
DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE
LIMITATION OR EXCLUSION MAY NOT APPLY TO YOU.
JET sells through distributors only. The specifications listed in JET printed materials and on official JET website are given as
general information and are not binding. JET reserves the right to effect at any time, without prior notice, those alterations to parts,
fittings, and accessory equipment which they may deem necessary for any reason whatsoever. JET
sold in Canada by JPW Industries, Inc.
Product Listing with Warranty Period
90 Days – Parts; Consumable items
1 Year – Motors; Machine Accessories
2 Year – Metalworking Machinery; Electric Hoists, Electric Hoist Accessories; Woodworking Machinery used for industrial
or commercial purposes
5 Year – Woodworking Machinery
Limited Lifetime – JET Parallel clamps; VOLT Series Electric Hoists; Manual Hoists; Manual Hoist
Accessories; Shop Tools; Warehouse & Dock products; Hand Tools; Air Tools
NOTE: JET is a division of JPW Industries, Inc. References in this document to JET also apply to JPW Industries, Inc., or any of
its successors in interest to the JET brand.
®
branded products are not
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JCT-4660 series Paving Breaker
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JET
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JCT-4660 series Paving Breaker
427 New Sanford Road
LaVergne, Tennessee 37086
Phone: 800-274-6848
www.jettools.com
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