Troubleshooting Guide
Power Feed Problems
Troubleshooting Guide
HD92doc042701
4-5
4
4.3
Power Feed Problems
NOTE: If the power feed circuit board has been upgraded since 9/96: The power feed cir-
cuit board is equipped with LED lights to help determine if the circuit board or feed rate
switch are the cause of any feed problems you may encounter.
See Section 4.4 Power
Feed Circuit Troubleshooting
for instructions.
PROBLEM
CAUSE
SOLUTION
Power Feed Is Jerky At Low
Speeds Or Does Not Move
Until Speed Is Above Halfway
Mark
Drum switch is dirty
Clean drum switch and lubricate with
contact grease supplied by
Wood-Mizer
Drum switch contacts are bad
Check that contacts are in good condi-
tion and positively close circuit
Components are loose or
wires are broken
Inspect PC board for loose connec-
tions and components; Send PC board
to Wood-Mizer for guaranteed repair
Power Feed Is Jerky When
Shaft Of Feed Rate Dial Is
Moved Back And Forth
Variable speed switch is bad -
perform the variable speed
switch test.
Replace variable speed switch
Power Feed Is Jerky, But
Power Feed Motor Runs Prop-
erly At All Speeds
Problem is mechanical.
Refer to the Mechanical Test.
Power Feed Motor Overheats
Middle track oiler is dragging
Clean middle track oiler and lubricate
with 30-weight oil or ATF (Automatic
Transmission Fluid) such as Dexron II.
Allow motor to cool before restarting
Ground is not level
Level mill with carpenter's level. Allow
motor to cool before restarting
Track roller bearing drag is
excessive
Lubricate bearings; Replace tight bear-
ings. Allow motor to cool before
restarting
Lower track rollers are not
aligned properly
Check stop block clearance from lower
bed rail. Allow motor to cool before
restarting
