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17

10.0

  Troubleshooting 

Symptom Possible 

Cause 

Correction 

Motor will not run 

Voltage is too low. 

Check power supply for proper voltage. 

Branch circuit fuse is blown or circuit 
breaker is tripped. 

Determine the reason for the blown fuse or 
tripped circuit breaker; then replace the fuse 
or reset the breaker. 

Branch is shut down for service. 

Check all personnel and machines on  

    

the branch to be certain someone has  

    

not shut down the branch for service. DO 
NOT replace the fuse or reset the breaker 
unless you are certain no personnel are 
working on the machines, wires or controls in 
the circuit. 

Open circuit in the wiring. 

Inspect all wire connections for loose or 
open connections. 

Motor is defective. 

Replace the motor. 

Switch is defective. 

Replace the switch. 

Motor 

stalls 

easily 

Low 

voltage. 

Check for proper voltage at the motor; 
correct as necessary. 

Fuse blown (three phase motors only). 

Replace the blown fuse. 

Improper wiring. 

Check for proper connections. 

Abrasive belt or disc 
slows down although 
motor keeps running at 
working speed 

Belt is slipping. 

Replace the belt. 

Poor tracking 

Tracking is out of adjustment. 

Adjust the belt tracking. 

Too much belt tension. 

Loosen the tension until the belt is just taut. 

Not enough belt tension. 

Tighten the tension until the belt is more taut. 

Belt is jointed improperly. 

Check belt for an irregular seam or shape. 

Lack of crown on the drive roller. 

Remove the belt and put a straight edge 
along the drive roller. There should be a 
slight crown (high spot toward the middle of 
the roller.) If the crown has worn away, 
replace the roller. 

Worn bearings. 

Check all the bearings for excessive heat or 
loose shafts. Replace if necessary. 

Unsteady belt 

Slack in the abrasive belt 

Adjust the belt tension. 

Short 

belt 

life 

Excessive pressure applied while 
grinding. 

Allow the belt to do the cutting. Excessive 
pressure only dulls the grit and removes it 
from the cloth. 

Working on only one side of the belt or 
only in one area of the disc. 

Use all surface areas of the abrasive cloth. 

Incorrect 

abrasive 

material 

or 

grit 

size. 

Check with your abrasives supplier for 
recommendations on the type and 
coarseness of the abrasive required for the 
workpieces you are sanding or grinding. 

 

CAUTION:

 For all of the electrical faults and corrections in the above table JET recommends the use of a qualified 

and licensed electrician for all circuit tracing, diagnosis and repair.   

Summary of Contents for J-420

Page 1: ...Sanders Models J 4200A J 4300A J 4400A J 4200A 2 J 4301A J 4401A J 4202A J 4200A Disc Belt Sander J 4300A Belt Sander J 4400A Disc Sander JET 427 New Sanford Road LaVergne Tennessee 37086 Part No M 41...

Page 2: ...te More Information JET Wilton and Powermatic are consistently adding new products For complete up to date product information check with your local distributor or visit the JET Wilton or Powermatic w...

Page 3: ...phase electrical hookup 16 9 2 Three phase electrical hookup 16 10 0 Troubleshooting 17 11 0 Replacement parts 18 11 1 1 Model J 4200A Belt and Disc Sander Assembly Exploded View 18 11 1 2 Model J 42...

Page 4: ...h 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...

Page 5: ...SI Z87 1 specifications could result in severe injury from the breakage of the eye protection 2 Wear leather safety gloves arm guards leather aprons and safety shoes 3 A dust collection system is reco...

Page 6: ...d productively You will note there are several types of electrical systems available for these machines All of these systems are equally effective in providing power to the grinding mechanism however...

Page 7: ...9x17x42 3 4 in 1070x725x4250mm Dimensions w platen vertical depthxWxH 19x16x57 1 2 in 475x400x1437mm 19x16x57 1 2 in 475x400x1437mm Dimensions w platen Horizontal depthxWxH 25 1 2x16x43 in 637x400x107...

Page 8: ...aten and at 45 downward essentially 90 45 or 135 total to the platen Never adjust the table angle while the sander is running Always turn the motor off before adjusting the table angle To Tilt the Bel...

Page 9: ...ngle to any required angle between 20 upward and 45 downward 3 Lock the two locking knobs underneath the table Figure 4 Disc sander table adjustment 6 6 Use of the Miter Gauge The miter gauge can be u...

Page 10: ...acks more or less true JUST BECAUSE THE OLD BELT TRACKED CORRECTLY DOES NOT MEAN THE NEW BELT WILL Always check the tracking when replacing a belt 12 To adjust the tracking 12 1 Plug the machine back...

Page 11: ...6 When accurately centered remove the rest of the protective backing and press the abrasive disc firmly against the drive disc so complete adhesive contact is made 7 Reconnect the power to the machin...

Page 12: ...1 16 inch away from the table then tighten BOTH of the set screws by inserting the hex wrench through the hole in the disc guard casting 15 Rotate the machine back onto its base and secure it with al...

Page 13: ...or DEATH if proper knowledge and precautions are not used Electrical instructions are included in section 9 0 Electrical connections 6 Machines with belts are shipped with the belts in slack conditio...

Page 14: ...le or adjustable machinist s square against either the left or right edge of the belt or platen and measure the distance to the miter slot edge See Figure 19 4 Move the measuring device to the opposit...

Page 15: ...the belt according to instructions in section 7 1 Belt replacement 10 Reinstall the guards and covers 11 Check and adjust the table angles and miter slot squareness according to table adjustment inst...

Page 16: ...required depending on which voltage you select This completes the voltage conversion process Circuit protection Where the service branch is protected with a fuse or circuit breaker that has too high a...

Page 17: ...s out of adjustment Adjust the belt tracking Too much belt tension Loosen the tension until the belt is just taut Not enough belt tension Tighten the tension until the belt is more taut Belt is jointe...

Page 18: ...rvice department call 1 800 274 6848 Monday through Friday see our website for business hours www jettools com Having the Model Number and Serial Number of your machine available when you call will al...

Page 19: ...sher M8 9 29 TS 1490041 Hex Cap Screw M8x25 3 30 5508435 Stud M10 1 31 TS 1550071 Flat Washer M10 4 32 5508436 Acorn Nut and Handle 1 33 TS 2361061 Lock Washer M6 3 34 TS 1482031 Hex Cap Screw M6x16 3...

Page 20: ...dler Drum Spacer 2 84 J 5508459 Idler Pin Bracket 1 85 TS 0367061 Roll Pin 1 4 x1 1 4 2 86 5052001 Block 2 87 5052061A Idler Drum 2 88 5508434 Pointer 1 89 5508451 Clamp with Pins 2 90 4200A 090 Roll...

Page 21: ...21 11 2 1 Model J 4300A Belt Sander Assembly Exploded View...

Page 22: ...1490041 Hex Cap Screw M8x25 3 30 5508435 Stud M10 1 31 TS 1550071 Flat Washer M10 4 32 5508436 Acorn Nut and Handle 1 33 TS 2361061 Lock Washer M6 3 34 TS 1482031 Hex Cap Screw M6x16 3 35 5508439 Prel...

Page 23: ...with Lock Nut 1 76 TS 2342121 Nylon Lock Hex Nut M12 2 77 5508460 Bearing Lock Nut 1 78 J 5051591A Idler Drum Guard 1 79 5508462 Stud 1 80 5508463 Clamp Bar 2 81 J 5052121 Bottom Guard 1 82 TS 236106...

Page 24: ...24 11 3 1 Model J 4400A Disc Sander Assembly Exploded View...

Page 25: ...8x20 1 18 4400A 018 Glue Bushing 1 22 TS 1540071 Hex Nut Full M10 4 23 TS 2210801 Hex Cap Screw M10x80 4 24 TS 1550071 Flat Washer M10 8 25 J 5508447 Base 1 27 TS 2361101 Lock Washer M10 4 28 5508450...

Page 26: ...26 11 4 1 Base Assembly Model J 4300A 1 Phase Exploded View...

Page 27: ...418 Strain Relief Bushing 6N3 4 1 19 4200A B320 Cover 1 20 4200A B321 Pan Head Bolt w Flange M6x12 3 21 TS 1540041 Hex Nut M6 3 22 9133081 Power Cord 1PH 1 23 TS 1540031 Hex Nut M5 2 24 TS 0733203 Loc...

Page 28: ...28 11 5 1 Base Assembly Model J 4300A 3 Phase Exploded View...

Page 29: ...c Switch 1 5HP 230V 3PH 1 9 4 4202A 5095 Magnetic Switch 1 5HP 460V 3PH 1 10 TS 1490021 Hex Cap Screw M8x16 4 11 J 5511729 Large Cover 1 12 4200A 5093 Strain Relief PG13 5 2 13 J 5052431 Motor Mountin...

Page 30: ...30 11 6 1 Base Assembly Model J 4200A 4400A 1 Phase Exploded View...

Page 31: ...Port 2 1 20 4200A B321 Pan Head Bolt w Flange M6x12 3 21 TS 1540041 Hex Nut M6 3 22 9133081 Power Cord 1PH 1 23 TS 1540031 Hex Nut M5 2 24 TS 0733203 Lock Washer Ext M5 2 25 4200A B325 Pan Head Screw...

Page 32: ...32 11 7 1 Base Assembly Model J 4200A 4400A 3 Phase Exploded View...

Page 33: ...c Switch 1 5HP 460V 3PH 1 10 TS 1490021 Hex Cap Screw M8x16 6 11 J 5511729 Large Cover 1 12 4200A 5093 Strain Relief PG13 5 2 13 J 5052431 Motor Mounting Plate 1 15 TS 2360121 Flat Washer M12 4 16 TS...

Page 34: ...34 12 1 Electrical schematic single phase...

Page 35: ...35 12 2 Electrical schematic 3 phase...

Page 36: ...36 427 New Sanford Road LaVergne Tennessee 37086 Phone 800 274 6848 www jettools com...

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