Operating and Maintenance Manual
©
HOFFMANN MU3-P & MU3-PD
• Version 7.205.00 • 01-2018
31
23
Troubleshooting
Problem
Possible Causes
Solution
Motor does not start when lever is
pulled.
Motor is not switched on
Power supply is interrupted
Motor is overheated
Set motor switch to ON
Check to make sure power cord is
securely plugged in, check extensions
cords, check fuses/breaker in line with
wall outlet.
Unplug motor until it has cooled down.
Decreasing RPM (motor speed)
Router bit is dull or broken.
Material being processed is too hard.
Motor brushes are worn or damaged.
Replace router bit with Original
HOFFMANN bit.
Only process material listed under
heading 3
– page 6
Replace brushes with Original
HOFFMANN brushes
Difficulty or resistance when raising
router carriage up.
Air pressure too low
Height Adjustment Bar is set and
locked at “0”
Set incoming air supply to 90 psi
Set height adjustment bar to desired
height.
Difficulty inserting Dovetail Keys
Dovetail Keys slide into keyway too
easy
Motor and router bit projection setting
incorrect.
Adjust motor and/or router bit as shown
under heading 11 and 12
Keyway position offset on left and right
side workpiece (square or butt joints)
Square Stop and/or Flip Stops are not
set correctly.
Adjust stops for proper alignment.
Keyway position offset on miter joint
Miter cut not precisely 45 degree on
one or both parts
Material was not properly placed on
machine
Material was not properly held during
routing operation
Motor not installed correctly
Check and adjust miter saw
– all four
parts for a frame must fit perfectly
without Dovetail Keys.
Make sure table is free of dust and
material is placed tightly against
fences.
Hold material steady to keep it from
moving during routing operation
Motor must be installed all the way in
motor carriage
– follow instructions
under heading 11
Please contact Hoffmann Technical Support at any time with any questions, concerns or other issues.
We are here to help you get the most out of your Hoffmann Dovetail Joining Machine.
Toll-free: 866
– 248 – 0100
International: 001
– 828 – 430 – 4510
Email:
