Top 20 Makita Nip 5"(127mm) Bench Grinder Wheel 743220a Questions & Answers

Make your own wrench out of a piece of wood stock,with 2 screws or nails spaced out to 2 opposing holes in the retaining ring/nut.HarborFreight sells a 'spanning wrench' online .

Yes all the tool places say discontinued. Yes, bypass it, but make sure you don't overwork the grinder. https://www.google.com/search?q=2610904741 ..

Out of warranty ... time for a replacement machine.I would choose a different make. Assuming the batery is not the fault.

DIRTY CONTACTS POSSIBLY

Size for size and component value identical on replacement. Fit the correct part.

Search using https://www.google.com or eBay.com Example of search result: http://www.1sourcecomponents.com/partinfo/Fa4-12/2bd%20trigger%20switch.htm

Jet 577102 is a bench grinder with 1HP motor. It has got guards on the grinding wheel. Dust vents and guard makes the grinder makes it an efficient grinder. 115 Volt is needed to run this high performance grinder.

Sometimes it could be like this contact by the centrifugal interrupter or the powerswitch or startcapacitor (only if its buzzing) an other kind of relay switch it should be simple to measure it .but to adjust it for time release can be ??.

One turn.

Here a possible diagram

The dresser wheel is applied strait onto the grinding wheel when you get ridges & valleys on the front of the grinding wheel to make it straight again.

that comes up as a craftsman brand by sears ( mass produced ) variable speed grinder I cant find an exploded view or user manual if you cant get the value information think you will be up for an oscilloscope

If there are only 4 wires used first is to find the wires of the powercable wallconnector make a measure between them the 2 other leads goes to the motor turn the motor wires and the power cable together temporarily for research that does everything if there is a thirth lead to find make a measurement from the metal point of the housing to the earth lead on the wall connector Beware to Not always trust the used colors and or cables if more people over time have worked on it . if not sure if its a CLass 2 double insulated or Class 1 with a third Green/yellow earthlead. look allways for the two square symboles on the name plate with technical information on the machine to be shure if its a double insulated kl2 machine or a kl1 ( if kl2 remove then always the kl1 cable with earth lead).

try this one : http://www.dhgate.com/product/150-50-25mm-slotted-rubber-polishing-wheel/211977164.html?utm_source=pla&utm_medium=GMC&utm_campaign=lpaladin&utm_term=211977164&f=bm%7c211977164%7c019024-Tools%7cGMC%7c246818428%7cpla%7clpaladin%7cUS%7c019024005-ToolParts%7cc%7c%7c0LRF%7c&gclid=CMDska-PycsCFRY8gQodBdQL1A

A single phase motor needs an additional winding for starting. The winding is often isolated by a centrifugal switch. If the grinder is little used it would not be unusual to find the bob-weights and linkage to be seized. It would seem time to dismantle the grinder and carry out some maintenance.

No specific test points are provided. The unit will need dismantling to expose the internal wiring for testing purposes.

To convert it its possible more expensive then buy an other grinder but there is some trick to connect in serial on the powercord a light bulb on a special choosen ability differs on the RPM or use a variable power resistor also in serial connection between on one of the 2 wires on the powercord.

The brand is the most important thing in this question if its an old tool then sometimes only the ball ball bearing can be damaged by the big grinders but in moast cases the little Chinese tools are builded with lightweight metal soft gears that are lubricated with amblygon or renolit grease and sometimes its easy to get spare parts, but depends on the brand and its models budget line or professional. Sometimes there are cone wheel crown wheel sets to get for not much money , and sometimes if there is no separate cone on the armature made for replace then its made for only buying an other tool it useless to repair it.

go to manufacturers web site and it may be there

longer wire is the positive