Troubleshooting

Trouble

Mortiser will not start.

Drill bit does not come up to speed.

Mortiser vibrates excessively.

Noisy Operation.

Workpiece Burns.

Drill bit wanders.

Wood splinters on the underside.

Drill bit binds in workpiece.

Probable Cause

Remedy

 

 

No incoming power.

Check all plug connections.

 

 

Fuse blown, or circuit breaker tripped.

Replace fuse, or reset circuit breaker.

 

 

Cord damaged.

Replace cord.

 

 

Motor bad.

Contact WMH technical service.

 

 

Extension cord too light or too long.

Replace with adequate size and

length cord.

 

 

 

Low current.

Contact a qualified electrician.

 

 

Stand on uneven surface.

Machine should be placed on level

floor; use shims if necessary.

 

 

 

Auger contacting chisel.

Increase offset of auger in relation to

chisel. See page 9.

 

 

 

 

Retract auger frequently to remove

Chips not clearing from hole or auger.

chips. Make sure chisel slot opens

 

toward area already cut.

 

 

Dull auger.

Resharpen, or replace auger.

 

 

Feeding auger into workpiece too

Increase feed rate.

slowly.

 

 

 

Auger sharpened incorrectly.

Resharpen auger correctly (page 17).

 

 

Chuck jaws not tight.

Tighten chuck jaws.

 

 

Bent auger.

Replace auger.

 

 

Auger or chuck not installed properly.

Reinstall the chuck, or auger properly.

 

 

No backing board used.

Place a scrap board underneath the

workpiece to prevent splintering.

 

 

 

Workpiece not clamped properly,

Support or clamp workpiece firmly.

pinching the auger.

 

 

 

Excessive feed rate.

Decrease feed rate.

 

 

Chuck jaws not tight.

Tighten chuck jaws.

 

 

Replacement Parts

Replacement parts are listed on the following pages. To order parts or reach our service department, call 1-800-274-6848 between 7:30 a.m. and 6:00 p.m. (CST), Monday through Friday. Having the Model Number and Serial Number of your machine available when you call will allow us to serve you quickly and accurately.

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Jet Tools M-1791309, 720HD operating instructions Troubleshooting, Replacement Parts, Probable Cause Remedy