2019 5 D4OPTRS
NOTE: The purge system control switch is located on the sweeper console in the
cab.
Proper performance of the dustless sweeper requires the fi lters be kept free fl owing as
measured by the minihelic restriction indicator gauge at the sweeper control console in the
cab. Readings above 8"-10" water column (WC) generally result in dust blowing out the
sides of the pickup head. The operator should stop and allow the purge system to clean the
fi lters back down to 3"-5" WC restriction and then proceed with sweeping. Depending on
the age of the fi lters, purging the fi lters clean could take from 5-15 minutes. Again, running
the hopper water will signifi cantly increase the fi lter operational life.
A control provision has been made to allow the operator to turn off the dustless feature of
the sweeper. This is separate from the fi lter purging system. When the DST-4 control switch
is turned off, air is no longer exhausted through the DST-4 box. This allows the operator to
purge the fi lters much quicker because no dirty air is fl owing to them. This also allows the
sweeper to sweep in wet weather conditions where the dustless feature is not required.
Additionally, a shop air provision (See Illustration M01306) has been made to allow the
purging of the DST-4 fi lter pack without running the sweeper auxiliary engine. The shop air
must be regulated to 95-100 PSI, excessive pressure will damage the fi lter media! This
provision allows the fi lters to be purged without dirty air recharging them and can be done for
an extended time such as at the end of the week to get the sweeper ready for the next week
of operation.
Finally, to protect the fi ltration box from over pressurization, a pressure relief port limits the
box pressure to 25 inch WC.
M01306
REPLACE PLUG
WITH APPROPRIATE
CONNECTOR
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