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JET   

 

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.) 

 

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 volume. 

 

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 Recommendations 

Equip the air compressor intake with a 
replaceable air filter that can be easily cleaned. 

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. 

Use anti-whip devices across hose couplings to 
prevent hose from whipping in the event of a hose 
failure or coupling disconnect. 

Always use moisture traps at the compressor for 
the main distribution line. Use moisture traps 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 inhibitors, 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 highly 
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

Summary of Contents for 550660

Page 1: ...neumatic 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...

Page 2: ...ucts 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 ventilat...

Page 3: ...with care 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...

Page 4: ...s 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...

Page 5: ...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 weigh...

Page 6: ...moisture then connect air supply hose to 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 f...

Page 7: ...ad from cylinder and remove throttle valve throttle valve spring plunger and plunger spring 4 Remove valve guide valve valve chest valve seat valve chest dowel pin and piston 5 Remove cylinder tappet...

Page 8: ...s 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 in...

Page 9: ...le air filter that can be easily cleaned 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 Joi...

Page 10: ...ice JCT 4660 JCT 4661 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 Assem...

Page 11: ...al Loss of power erratic action Low air pressure or air volume Verify compressor has proper CFM rating for tool Check compressor regulator setting set air pressure to 90 psi Check for loose connection...

Page 12: ...have entered during assembly Excessive heat develops in tool Improper lubrication Lubricate properly according to instructions in this manual Worn internal parts Inspect and replace as needed Tool con...

Page 13: ...ugh Friday 8 00 a m to 5 00 p m CST Please have the stock number and serial number of your tool available when you call so that we may serve you quickly and accurately Non proprietary parts such as fa...

Page 14: ...14 JCT 4660 series Paving Breaker 550660 JCT 4660 Paving Breaker 60 lb...

Page 15: ...e chest dowel pin 1 4x20L 1 25 JCT4660 25 Cylinder 1 Index Part No Description Qty 26 P91238 Air inlet screen 1 27 P91222 Air inlet swivel o ring 28 5x2mm 1 28 P91235 Air inlet swivel 1 29 P91237 O ri...

Page 16: ...16 JCT 4660 series Paving Breaker 550661 JCT 4661 Paving Breaker 90 lb...

Page 17: ...valve spring 1 25 P91202 Cylinder plug 5 26 JCT4661 26 Cylinder 1 Index Part No Description Qty 27 P91238 Air inlet screen 1 28 P91222 Air inlet swivel o ring 28 5x2mm 1 29 P91235 Air inlet swivel 1...

Page 18: ...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 Servi...

Page 19: ...JET 19 This page intentionally left blank...

Page 20: ...20 JCT 4660 series Paving Breaker 427 New Sanford Road LaVergne Tennessee 37086 Phone 800 274 6848 www jettools com...

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