Sharp LMV Series - Variable Speed Head Troubleshooting; Troubleshooting Noise Issues

22
Variable Speed Head Trouble shooting
Problem
Possible Cause
Solution
Consistent noise in both
High and Low gear (Quiet
in Neutral)
Upper and lower head not
aligned
Spindle spline and hub do
not match
Align
Replace either to match
Replace H348 spindle
bearing set or H349 top
bearing if no chatter is
present
Noise in High gear, Low
gear & Neutral noise at all
speed
Noise frequency follows
the speed
Noise frequency does not
follow the speed
Replace spindle pulleys
and H522 bearings.
Replace motor bearings/
Motor
Noise in High gear only
Worn clutch
Clutch out of adjustment
Replace H561 & H572
Adjust position of H/L
lever
Noise in Low gear only
Bull gear
Timing belt
Timing pulley
Lubricate bull gear
Hold brake & turn spindle
by hand. If more than ¼
turn, replace timing belt.
Replace bearing H301
Noise when quill is out
Twisted spindle
Alignment of H & L head
if noise
Depends on position of
spindle
Replace spindle
Align head