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1.0

  IMPORTANT SAFETY 

INSTRUCTIONS 

WARNING – To reduce risk of injury: 

-   Misuse of this machine can cause serious injury. 

-   For safety, the machine must be set up, used and 

serviced properly. 

-   Read, understand and follow the instructions in the 

operator’s and parts manual which was shipped with 
your machine. 

-   Never modify the machine without consulting JET. 

1.1

  General Machinery Warnings 

1.  Always wear protective eye wear when operating 

machinery. Eye wear shall be impact resistant, 
protective safety glasses with side shields which 
comply with ANSI Z87.1 specifications. Use of eye 
wear which does not comply with ANSI Z87.1 
specifications could result in severe injury from the 
breakage of the eye protection. 

2.  Wear proper apparel. No loose clothing or jewelry 

which can get caught in moving parts. Rubber 
soled, nonslip, footwear is recommended for best 
footing. 

3.  Do not overreach. Failure to maintain a proper 

working position can cause you to fall into the 
machine or cause your clothing to get caught — 
pulling you into the machine.  

4.  Keep guards in place and in proper working order. 

Do not operate the machine with the guards 
removed. 

5.  Avoid dangerous working environments. Do not 

use stationary machine tools in wet or damp 
locations. Keep work areas clean and well lit. 

6.  Avoid accidental starts by being sure that the start 

switch is in the “OFF” position before plugging in 
the machine. 

7. Never leave the machine running while 

unattended. The machine shall be shut off 
whenever it is not being used. 

8.  Disconnect the electrical power before servicing, 

whenever changing accessories or when general 
maintenance is done on the machine. 

9.  Maintain all machine tools with care.  Follow all 

maintenance instructions for lubricating and the 
changing of accessories. No attempt shall be 
made to modify or have makeshift repairs done to 
the machine. This not only voids the warranty but 
also renders the machine unsafe. 

10. If there is any risk of tipping or sliding, the 

machinery must be anchored to the floor. 

11.  Secure your work. Use clamps or a vise to hold 

your work, when practical. It is safer than using 
your hands and it frees both hands to operate the 
machine. 

12.  Never brush chips away while the machine is in 

operation. 

13. Keep work area clean. Cluttered areas invite 

accidents. 

14. Remove adjusting keys and wrenches before 

turning the machine on. 

15.  Use the right tool. Don’t force a tool or attachment 

to do a job for which it was not designed. 

16.  Use only recommended accessories and follow 

manufacturer’s instructions pertaining to them. 

17.  Keep hands in sight and clear of all moving parts 

and cutting surfaces. 

18.  All visitors should be kept at a safe distance from 

the work area. Make your workshop completely 
safe by using padlocks, master switches, or by 
removing starter keys. 

19. Know the tool you are using; its application, 

limitations, and potential hazards. 

20.  Do not stand on the tool. Serious injury could occur 

if the tool is tipped or the cutting tool is 
unintentionally contacted. 

21. 

Check damaged parts. Before further use of the 
tool, a guard or other part that is damaged 
should be carefully checked to determine that it 
will operate properly and perform its intended 
function- check for alignment of moving parts, 
binding of moving parts, breakage of parts, 
mounting, and any other conditions that may 
affect its operation. A guard or other part that is 
damaged should be properly repaired or 
replaced.

 

1.2

  General Electrical Cautions 

This machine must be grounded in accordance with the 
National Electrical Code and local codes and 
ordinances. The work should be done by a qualified 
electrician. The machine must be grounded to protect 
the user from electrical shock. 

CAUTION:

 For circuits that are a great distance from 

the electrical service box, the wire size must be 
increased in order to deliver ample voltage to the 
motor. To minimize power losses and to prevent motor 
overheating and burnout, the use of wire sizes for 
branch circuits or electrical extension cords according 
to the following table is recommended: 

Conductor 

length 

AWG (American Wire Gauge) 

number 

 

240 volt lines 

120 volt lines 

0-50 feet 

No. 14 

No. 14 

50-100 feet 

No. 14 

No. 12 

Over 100 feet

No. 12 

No. 8 

Summary of Contents for J-4210

Page 1: ...Instructions and Parts Manual Belt and Disc Sanding Machine Model J 4210 JET 427 New Sanford Road LaVergne Tennessee 37086 Part No M 414550 Ph 800 274 6848 Revision C 10 2018 www jettools com Copyrig...

Page 2: ...the floor 11 Secure your work Use clamps or a vise to hold your work when practical It is safer than using your hands and it frees both hands to operate the machine 12 Never brush chips away while th...

Page 3: ...ng or poor handling 9 When installing a new disc be certain the disc is accurately centered on the drive wheel Failure to do so could cause a serious unbalanced condition 10 Always present the workpie...

Page 4: ...usting belt tracking 8 9 2 Platen housing position 8 9 3 Adjusting sander tables 8 10 0 Operation 9 10 1 Miter gauge 9 10 2 Controls 9 11 0 User maintenance 9 11 1 Lubrication 9 11 2 Cleaning 9 11 3 R...

Page 5: ...web site www jettools com Retain this manual for future reference If the machine transfers ownership the manual should accompany it Read and understand the entire contents of this manual before attem...

Page 6: ...er slot 5 8 in 16 mm Disc sanding Disc speed 2100 RPM Abrasive disc size and grit 10 in 254 mm 80 Grit Disc table Cast iron 7 1 2 x 13 in 191 x 330 mm Disc table miter slot 5 8 in 16 mm Disc table til...

Page 7: ...ailure to comply may cause serious or fatal injury Use only 3 wire extension cords that have 3 prong grounding plugs and 3 pole receptacles that accept the tool s plug Repair or replace damaged or wor...

Page 8: ...djustment 9 2 Platen housing position The sanding belt can be operated with the platen housing at horizontal vertical or any angle in between Change position of platen housing as follows Numbers in pa...

Page 9: ...t safety key and store key in a safe place Key must be reinserted to start machine 11 0 User maintenance Always disconnect power to machine before performing maintenance Failure to do this may result...

Page 10: ...to rod 74 Position table so it is level and tighten screw 65 against rod 74 11 Connect electrical power and operate machine to check operation 11 5 Replacing V belts 1 Disconnect electrical power 2 Re...

Page 11: ...he set screw 29 Install plate 55 and secure with four screws 56 Check for clearance between plate 55 and sanding disc 30 Install table 60 onto rod 74 Position table so it is level and tighten screw 65...

Page 12: ...belt tension inadequate Tighten sanding belt Excessive pressure being applied to platen housing Reduce pressure on sanding belt and platen housing Motor belt loose Tighten motor belt Disc stalls when...

Page 13: ...13 13 1 1 J 4210 Belt Disc Sander Exploded View...

Page 14: ...hown 300MFD 125VAC 1 26 5513035 Hex Screw 3 8 X 1 3 27 5513036 Flat Washer 3 8 3 28 5513037 Screw 3 8 X 1 1 2 1 29 5513038 Nut Jam 1 30 J 5513039G Mounting Bracket 1 31 5513040 Screw 5 16 X 1 1 32 551...

Page 15: ...Guard 1 76 5513094 Screw 3 16 X 5 8 1 77 5513095 Sanding Belt Cover not shown 1 77A 5513096 Cap Screw not shown 8 78 5512766 Switch Assembly 1 79 5051841 Abrasive Belt 6 x 48 80 Grit 1 5512764 Abrasi...

Page 16: ...16 13 2 1 J 4210 Stand Exploded View 13 2 2 J 4210 Stand Parts List Index No Part No Description Size Qty 1 J 5513476G Access Panel 1 2 5513477 Knob 2 3 414549 Complete Stand Assembly 1...

Page 17: ...17 14 0 Electrical Connections for J 4210...

Page 18: ...tional 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 Loc...

Page 19: ...19 427 New Sanford Road LaVergne Tennessee 37086 Phone 800 274 6848 www jettools com...

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