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JAT-740 Angle Sander 

 

 

4. 

When finished operating sander, disconnect 
air hose. Wipe off housing with a dry cloth. 
Place 4 or 5 drops of air tool oil into air inlet; 
re-connect air and run tool for a few seconds 
to distribute the oil. Disconnect air. 

Periodically apply 1 or 2 drops of air tool oil to 
throttle lever pivot, and work lever to distribute the 
oil. 

Storage  

Avoid storing this tool in very humid locations 
which promotes rusting of internal mechanisms. 
Always oil the 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.  

2. 

Make sure air compressor supplies clean, 
dry air at correct CFM for the tool. 

3. 

Set air pressure to 90 psi.  

 

Excess air pressure 

and/or unclean air will shorten the tool’s 
life and may create a hazardous situation. 

4. 

Drain water from air compressor tank daily, 
as well as any condensation from air lines. 
Water in the air line may enter the tool and 
cause damage. 

5. 

Change filters on the air system on a regular 
basis. 

6. 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 3/8-inch. 

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. 

Summary of Contents for 505740

Page 1: ...Pneumatic 7in Angle Sander 505740 JAT 740 Operation Parts Manual M 505740 Edition 2 06 2015 JET 427 New Sanford Road LaVergne TN 37086 Ph 800 274 6848 www jettools com Copyright 2015 JET...

Page 2: ...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 Ce...

Page 3: ...romium 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 wi...

Page 4: ...er accessories may be hazardous 31 Maintain tools 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...

Page 5: ...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...

Page 6: ...verall Length 12 in 304 8 mm Housing material Aluminum with rubber grip Net weight 4 72 lb 2 14 kg Shipping weight 5 39 lb 2 44 kg 1 The specified values are emission levels and are not necessarily to...

Page 7: ...o 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 8 Grip handle firmly and place other...

Page 8: ...ool 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 nu...

Page 9: ...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 Figure 2 Recommended arrangement of air pip...

Page 10: ...al vibration Bearings worn Disassemble and inspect bearing Grease or replace as needed Loss of power erratic action Low air pressure Verify compressor has proper CFM rating for tool Check compressor r...

Page 11: ...following pages To order parts or reach our service department call 1 800 274 6848 Monday through Friday 8 00 a m to 5 00 p m CST Please have the stock number and serial number of your tool available...

Page 12: ...gle Sander 505740 JAT 740 7in Angle Sander exploded view 44 28 23 32 43 4 5 30 26 25 31 24 29 23 13 12 12 13 15 12 2 3 13 10 7 11 6 8 9 13 12 38 16 14 1 33 27 20 17 22 21 18 19 23 37 36 35 45 46 40 41...

Page 13: ...12L 1 23 BB 608ZZ Ball bearing 608ZZ 3 24 JAT741 24 Spindle 5 8 11 1 Index Part No Description Qty 25 JAT741 25 Retaining ring STW 16 1 26 JAT741 26 Wave washer WW 16 1 27 JAT740 27 Pinion gear 1 28 J...

Page 14: ...14 JAT 740 Angle Sander This page intentionally left blank...

Page 15: ...JET 15 This page intentionally left blank...

Page 16: ...16 JAT 740 Angle Sander 427 New Sanford Road LaVergne Tennessee 37086 Phone 800 274 6848 www jettools com...

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