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JET   

13 

 

#505120, JAT-120, 3/8-inch Impact Wrench – parts list 

Index Part 

No. 

Description 

Qty 

1 JAT120-01 Motor 

housing 

2 JAT120-02 Reverse 

valve 

JAT120-03 

O-Ring S16 NBR ø15.5x1.5 

4 JAT120-04 

O-Ring AS016 NBR 
ø15.6x1.78 

JAT120-05 

Throttle valve seat 

6 JAT120-06 O-Ring 

1019NBR 

ø18.8x1.9

7 JAT120-07 Throttle 

valve 

assembly 

8 JAT120-08 Spring 

9 JAT120-09 Air 

inlet 

10 

JAT120-10 

O-Ring P20 NBR ø19.8x2.4 

11 

JAT120-11 

O-Ring P22 NBR ø21.8x2.4 

12 JAT120-12 Exhaust 

deflector 

13 

JAT120-13 

Spring pin ø3.5x28L 

14 

JAT120-14 

Spring pin ø2x20L 

15 JAT120-15 Trigger 

assembly 

20 

JAT312-09 

O-Ring S29 NBR ø28.5x2 

21 JAT120-21 Pin 

12L14 

22 JAT120-22 Spring 

23 

JAT120-23 

Spring pin ø2x6L 

24

 

JAT120-24

 

O-Ring NBR ø34x2

 

1

 

Index Part No. 

Description 

Qty

26 

BB-R6 

Ball bearing EE3 (R6) 

27 JAT120-27 Cylinder 

assembly 

28 JAT120-28 Rotor 

29 JAT120-29 Rotor 

vane 

30 

JAT120-30 

Spring pin ø2x10 

31 JAT120-31 Front 

end 

plate 

32 

JAT120-32 

Ball bearing 6901 

34 JAT120-34 Gasket 

36 JAT120-36 Hammer 

cage 

37 JAT120-37 Hammer 

38 JAT120-38 Hammer 

pin 

39 JAT120-39 Anvil 

3/8in. 

41 JAT120-41 Hammer 

case 

assembly 

42 JAT120-42 Reverse 

knob 

43 

SB-1/8 

Steel ball 1/8in. 

44 

JAT120-44 

Steel ball spring 

45 JAT120-45 Damping 

material 

46 

JAT120-46 

Screw #10-24x80 SCM435 

47 JAT120-47 O-Ring 

NBR 

ø6.6x8.2x1.7 

48 JAT120-48 Socket 

retainer 

58 JAT120-58 Reverse 

valve 

JAT120-RPK, Repair Kit, contains 3,4,6,8,10(2),11,20,22,24,29(6),34,43,44,45,47,48 

JAT120-RBK, Rebuild Kit, contains 27,30,31,38(2),39 

 

 

 

 

Summary of Contents for 505120

Page 1: ...nch 505120 JAT 120 505121 JAT 121 505122 JAT 122 505123 JAT 123 Operation Parts Manual M 505120 Edition 2 06 2015 JET 427 New Sanford Road LaVergne TN 37086 Ph 800 274 6848 www jettools com Copyright 2015 JET JAT 120 shown ...

Page 2: ...st 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 Ho...

Page 3: ...hromium 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 loa...

Page 4: ...s 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 air source for the tool These can present risk of explosion and serious injury 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 ...

Page 5: ...ns 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 a...

Page 6: ...psi 621 kPa 90 psi 621 kPa Vibration value 10 4 m s2 10 6 m s2 9 43 m s2 7 36 m s2 Noise level 1 104 dB A 107 dB A 108 dB A 109 dB A Power setting 4 position forward 1 position reverse 4 position forward 1 position reverse 4 position forward 1 position reverse 4 position forward 1 position reverse Grip Pistol style Pistol style Pistol style Pistol style Overall Length 6 0 in 152 4 mm 7 2 in 182 9 ...

Page 7: ...ettings 5 Select rotation direction by pushing Forward Reverse knob push left to loosen a nut right to tighten Make sure nut or bolt can withstand rated torque of impact wrench To loosen nut or bolt 1 Select reverse rotation 2 Place socket over nut hold grip firmly and place other hand over top of housing Gently squeeze trigger Important If tool cannot loosen nut DO NOT raise air pressure above 90...

Page 8: ...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 impact wrench 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 ta...

Page 9: ...ompressor 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 i...

Page 10: ...ghtness of housing and external fasteners Loss of power erratic action Low air pressure Verify compressor has proper CFM rating for tool Check compressor regulator setting set air pressure to 90 psi Set regulator dial on tool to maximum setting Check for loose connections Moisture or obstruction in air hose Air supply must be clean and dry Clean out air hose s and remove any kinks or bends Imprope...

Page 11: ...ousing loose or damaged Tighten or replace as needed Replacement parts Service parts are listed on the 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 when you call so that we may serve you quickly and accurately ...

Page 12: ...2 JAT 120 121 122 123 Impact Wrenches 505120 JAT 120 3 8 inch Impact Wrench exploded view 15 45 43 44 34 32 31 28 30 24 26 20 1 46 41 48 39 36 38 47 37 2 3 4 5 6 7 8 10 12 11 9 42 29 14 13 27 58 23 21 22 ...

Page 13: ...120 22 Spring 1 23 JAT120 23 Spring pin ø2x6L 1 24 JAT120 24 O Ring NBR ø34x2 1 Index Part No Description Qty 26 BB R6 Ball bearing EE3 R6 1 27 JAT120 27 Cylinder assembly 1 28 JAT120 28 Rotor 1 29 JAT120 29 Rotor vane 6 30 JAT120 30 Spring pin ø2x10 1 31 JAT120 31 Front end plate 1 32 JAT120 32 Ball bearing 6901 1 34 JAT120 34 Gasket 1 36 JAT120 36 Hammer cage 1 37 JAT120 37 Hammer 2 38 JAT120 38...

Page 14: ...JAT 120 121 122 123 Impact Wrenches 505121 JAT 121 1 2 inch Impact Wrench exploded view 15 28 29 31 32 33 34 24 26 20 21 58 22 23 44 43 42 3 2 4 5 6 7 9 11 12 10 8 45 13 14 46 1 37 38 36 39 47 48 41 30 27 ...

Page 15: ... JAT120 23 Spring pin ø2x6L 1 24 JAT121 24 O Ring S46 NBR ø45 5x2 1 26 BB R6 Ball bearing EE3 R6 1 Index Part No Description Qty 27 JAT121 27 Cylinder assembly 1 28 JAT121 28 Rotor 1 29 JAT121 29 Rotor vane 7 30 JAT121 30 Spring pin ø2 5x10 1 31 JAT121 31 Front end plate 1 32 JAT121 32 Ball bearing EE4 CM 5K R8 1 33 JAT121 33 Washer 1 34 JAT121 34 Gasket 1 36 JAT121 36 Hammer cage 1 37 JAT121 37 H...

Page 16: ...JAT 120 121 122 123 Impact Wrenches 505122 JAT 122 1 2 inch Impact Wrench exploded view 15 28 29 31 32 33 34 24 26 20 21 58 22 23 44 43 42 3 2 4 5 6 7 9 11 12 10 8 45 13 14 46 1 37 38 36 54 47 48 41 30 27 ...

Page 17: ...120 23 Spring pin ø2x6L 1 24 JAT121 24 O Ring S46 NBR ø45 5x2 1 26 BB R6 Ball bearing EE3 R6 1 Index Part No Description Qty 27 JAT121 27 Cylinder assembly 1 28 JAT121 28 Rotor 1 29 JAT121 29 Rotor vane 7 30 JAT121 30 Spring pin ø2 5x10 1 31 JAT121 31 Front end plate 1 32 JAT121 32 Ball bearing EE4 CM 5K R8 1 33 JAT121 33 Washer 1 34 JAT121 34 Gasket 1 36 JAT121 36 Hammer cage 1 37 JAT121 37 Hamme...

Page 18: ...AT 120 121 122 123 Impact Wrenches 505123 JAT 123 3 4 inch Impact Wrench exploded view 15 24 20 1 2 3 4 5 6 7 8 10 18 12 11 9 14 13 17 25 30 31 32 28 27 33 35 36 40 41 38 34 42 43 44 45 26 29 47 58 23 21 22 ...

Page 19: ...in 12L14 1 22 JAT123 22 Spring 1 23 JAT123 23 Spring pin ø2x7 SK5 1 24 JAT123 24 Ball bearing 6001 C3 L627 1 Index Part No Description Qty 25 JAT123 25 O Ring 1 26 JAT123 26 Cylinder assembly 1 27 JAT123 27 Rotor vane 6 28 JAT123 28 Rotor 1 29 JAT123 29 Spring pin ø3 5x12 SK5 1 30 JAT123 30 Front end plate 1 31 JAT123 31 Ball bearing 6003 CMSM 1 32 JAT123 32 Hammer case gasket 1 33 JAT123 33 Hamme...

Page 20: ...20 JAT 120 121 122 123 Impact Wrenches 427 New Sanford Road LaVergne Tennessee 37086 Phone 800 274 6848 www jettools com ...

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