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10 

Electrical 

Electrical Requirements 

When connecting the bench grinder to the power 
source  outlet,  the  outlet  must  be  properly 
grounded  to  protect  the  operator  from  electrical 
shock. 

In  the  event  of  a  malfunction  or  breakdown, 
grounding provides a path of least resistance for 
electrical  current  to  reduce  the  risk  of  electrical 
shock. This machine is equipped with an electric 
cord having an equipment-grounding conductor-
outlet  that  is  properly  installed  and  grounded  in 
accordance with all local codes and ordinances. 

This  grinder  is  equipped  with  a  power  cord. 
Improper connection of the equipment grounding 
conductor  can  result  in  a  risk  of  electric  shock. 
The  conductor  with  insulation  having  an  outer 
surface  that  is  green  (with  or  without  yellow 
stripes)  is  the  equipment  -grounding  conductor. 
If  repair  or  replacement  of  the  electric  cord  or 
plug  is  necessary,  do  not  connect  the 
equipment-grounding  conductor  to  a  live 
terminal. 

Plug  power  cord  into  a  110-120V  properly 
grounded  outlet  protected  by  a  14-amp  fuse  or 
circuit breaker. 

  Do  not  touch  the  prongs  of 

the  power  cord  plug  when  plugging  or 
unplugging to or from an outlet. 

  If  improperly  grounded,  this 

power  tool  can  cause  serious  injury  from 
electrical  shock,  particularly  when  used  in 
damp  locations  or  near  plumbing.  If  an 
electrical shock occurs, there is the potential 
of  a  secondary  hazard  such  as  your  hands 
coming  in  contact  involuntarily  with  the 
rotating grinder. 

Electrical Connections 

The  JBG  series  bench  grinders  are  rated  at 
120V, 1Ph. These grinders are designed for use 
on  a  circuit  with  an  outlet  that  looks  the  one 
shown  in  Fig.  A.  and  have  a  grounding  prong, 
also shown in Fig. A. A temporary adapter (Fig. 
B)  may  be  used  to  connect  the  plug  to  a  two-
prong receptacle (Fig. B) if a properly grounded 
outlet  is  not  available.  A  temporary  adapter 
should  only  be  used  until  a  properly  grounded 
outlet can be installed by a qualified electrician. 

This adapter is not applicable in Canada. 

The 

green colored lug must be fastened to the cover 
plate screw. 

Important

: The adapter illustrated in Fig. B is for 

use  only  if  you  already  have  a 

properly 

grounded

  two-prong  receptacle.  Do  not  modify 

the plug provided-if it will not fit the outlet, have 
the  proper  outlet  installed  by  a  qualified 
electrician.  Check  with  a  qualified  electrician  or 
service  personnel  if  the  grounding  instructions 
are not completely understood, or if in doubt as 
to whether the tool is properly grounded. 

  Before  plugging  into  the 

power  source,  be  sure  that  power  switch  is 
in the OFF position. 

 

 

Extension Cords 

Use  only  three-wire  extension  cords  that  have 
three-prong  grounding  type  plugs  and  three-
prong  receptacles  that  accept  the  tool's  plug. 
Replace  or  repair  damaged  or  worn  core 
immediately. 

USE PROPER EXTENSION CORD. Make sure 
your  extension  cord  is  good  condition.  When 
using  an  extension  cord,  be  sure  to  use  one 
heavy enough to carry the current your product 
will draw. An undersized cord will cause a drop 
in  line  voltage  resulting  in  loss  of  power  and 
overheating.  Table  1  shows  the  correct  size  to 
use  depending  on  cord  length  and  nameplate 
ampere rating. If in doubt, use the next heavier 
gage. The smaller the gage number, the heavier 
the cord.  

Amp 

Rating 

Volts 

Total length of cord in feet 

120V 
240V 

25 
50 

50 

100 

100 
200 

150 
300 

 

AWG 

0 – 

0

6 – 10 

10 – 12 
12 – 16 

 

18 
18 
16 
14 

16 
16 
16 
12 

16 
14 
14 

not rcmd 

14 
12 
12 

not rcmd 

Table 1 

Summary of Contents for JBG-8A

Page 1: ...G Series Bench Grinders Models JBG 6A JBG 8A JBG 10A Model JBG 8A shown JET 427 New Sanford Road LaVergne Tennessee 37086 Part No M 577101 Ph 800 274 6848 Revision M 06 2019 www jettools com Copyright...

Page 2: ...nal 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 Locato...

Page 3: ...11 Precautions 11 Adjustments 11 Eye Shield Tilt Adjustment 11 Spark Guard 11 Tool Rest 11 Maintenance 12 Ring Test 12 Care of Grinding Wheel 12 Changing Wheels 12 Grinding Wheels 13 Wire Wheel Brush...

Page 4: ...cting the machine to the power supply 13 Make certain the machine is properly grounded 14 Make all machine adjustments or maintenance with the machine unplugged from the power source 15 Remove adjusti...

Page 5: ...ver leave the machine running unattended Turn the power off and do not leave the machine until it comes to a complete stop 34 Remove loose items and unnecessary work pieces from the area before starti...

Page 6: ...10A Stock Number 577101 577102 577103 Overall Dimension L x H x D in 18 x 10 1 2 x 8 1 2 19 x 12 1 2 x 10 24 1 2 x 12 1 4 x 13 Wheel Size D x W x Bore in 6 x 3 4 x 1 2 8 x 1 x 5 8 10 x 1 x 1 Wheels In...

Page 7: ...ardware 1 ea Bracket Left A 2 ea Lock Knob B 1 ea Bracket Right C 1 ea Spark Guard Left D 2 ea 1 4 x 1 2 Screw E 1 ea Spark Guard Right F 2 ea Eye Shield Bracket Plate G 4 ea 5 16 x 3 4 Hex Cap Screw...

Page 8: ...y Do not operate this grinder without all guards and shields in place and in working order Failure to comply may cause serious injury Chipped or cracked wheels can break up and cause serious damage to...

Page 9: ...t tool rest J by threading two 5 16 x 3 4 hex cap screws C through two 5 16 flat washers D and the tool rest J into the wheel housing M The tool rests should be adjusted to within 1 16 of the grinding...

Page 10: ...ks the one shown in Fig A and have a grounding prong also shown in Fig A A temporary adapter Fig B may be used to connect the plug to a two prong receptacle Fig B if a properly grounded outlet is not...

Page 11: ...n the workpiece and keep it moving at an even pace for smooth grinding Pressing too hard overheats the motor and prematurely wears down the grinding wheels Note the original bevel angle on the item to...

Page 12: ...RPM marked on the grinder s nameplate Refer to Table 2 to determine correct dimensions for the replacement wheel Model Wheel Diameter Maximum Width Center Hole JBG 6A 6 3 4 1 2 JBG 8A 8 1 5 8 JBG 10A...

Page 13: ...shes for hard cleaning jobs Use fine wire brushes for polishing and finish work When the brush tips become dull reverse the brush on the grinder Cleaning Metal shavings may still be hot from recent gr...

Page 14: ...cord Use correct size extension cord see manual Short circuit Cord plug or motor need repair call JET Customer Service Dept Motor fails to develop full power Low line voltage Check power line for prop...

Page 15: ...Screw 3 16 x 5 8 4 JBG10A 15 Screw 1 4 x 7 8 4 16 JBG6A 16B Inner Wheel Guard left serial 15070001 and higher 1 JBG8A 16B Inner Wheel Guard left serial 15060001 and higher 1 JBG10A 16B Inner Wheel Gu...

Page 16: ...late 1 JBG10A 33 Star Washer JBG 10A only not shown 2 34 JBG6A 34 Cross Screw 3 16 x 1 4 2 35 JBG6A 35 Condenser 125 VAC 100MFD 1 JBG8A 35 Condenser 125 VAC 200MFD 1 JBG10A 35 Condenser 125 VAC 300MFD...

Page 17: ...BG10A 56 Eye Shield Plate right 1 57 JBG6A 57 Lock Hub JBG 6A 8A 1 4 2 58 JBG6A 58 Cross Screw 3 16 x 3 8 4 59 JBG6A 59 Eye Shield 2 JBG6A 59A Eye Shield Assembly 2 JBG8A 59 Eye Shield 2 JBG8A 59A Eye...

Page 18: ...18 Assembly Drawing...

Page 19: ...19 Wiring Diagram...

Page 20: ...ll 1 800 274 6848 Monday through Friday 8 00 a m to 5 00 p m CST Having the Model Number and Serial Number of your machine available when you call will allow us to serve you quickly and accurately 427...

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