D4OPTRS 10 2019
TROUBLESHOOTER’S GUIDE
PROBLEM
Sweeper blows out dust
from pickup head skid
plates
Dustless system not
functioning
Flue Plate fully open and
will not close
CAUSE
Damper fl ue plates closed
Blown fuse or bad electrical
connection
Air leaks, bad seals or
doors not closed
Precleaner stopped up
Precleaner stopped up
Curtain lifter on
Blast orifi ce not set properly
Bad fl ue actuator or
harness
SOLUTION
Make sure the DST Mode
switch on the control panel
is in the “ON” position and
VMM Input #3 LED is on
Check DST circuit fuse at
sweeper console
Check DST VMM power
fuse at battery
Make sure service switch
is in the “ON” position and
the VMM power light is on
steady.
Make sure all seals are
in good condition and all
sweeper hopper service
doors are closed.
Make sure front pickup
head curtains are in good
condition.
Check pickup head blast
orifi ce gap, if too large,
pickup head will “blow out”.
Remove precleaner and
observe tube openings.
Remove any trash or
obstruction.
See Above.
Turn Curtain Lifter off
Check pick-up head blast
orifi ce gap, if too large, pick-
up head will “blow out”.
Turn off DC mode switch
and observe the output LED
9 and 10. They should come
on solid for 15 seconds. If
the fl ue does not close, the
actuator or the harness is
bad.
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