TYMCO DST-4 2019 User manual

MODEL
DST-4
OPERATOR’S
MANUAL
2019
DUSTLESS
SWEEPING
TECHNOLOGY
TYMCO, INC.
P.O. BOX 2368, WACO, TEXAS 76703
(Shipping Address)
225 EAST INDUSTRIAL BLVD. WACO, TEXAS 76705
PHONE: [phone] • FAX: [phone]
WEB SITE: www.tymco.com
E-MAIL ADDRESS: [email protected]

CONGRATULATIONS
You have just purchased the finest air sweeper produced. Yet, for all of its advanced
engineering, in spite of all the skills that have gone into it - your sweeper is only as good as
its operator.
TYMCO REGENERATIVE AIR SWEEPER SOLD & SERVICED BY:
MODEL DST-4
(Dustless Sweeping Technology)
SND SERIES
NOTE: DO NOT destroy any part of this manual. It contains pertinent information
on parts, operation and maintenance of your TYMCO REGENERATIVE AIR
SWEEPER and truck chassis.
An informed operator will do a better job. Make sure he/she has an opportunity to
study this manual.
© 2018 TYMCO
2019 EDITION
This Operator’s Manual is the property of TYMCO, and is considered proprietary.
It may not be reproduced by photocopying or otherwise without
the express written permission of TYMCO.
Violators will be prosecuted to the full extent of the law.

INTRODUCTION
To insure proper understanding of operation, cleaning and maintenance of your TYMCO
REGENERATIVEAIRSWEEPER,itisnecessarythatthisOperator’sManualandtheService
& Parts Manual be read and studied from cover to cover by the operator.Afull understanding
of this equipment will help the operator achieve the results expected of this machine.
Though, seemingly, a very simple machine, the TYMCO REGENERATIVE AIR SWEEPER
utilizes air instead of conventional rotary brushes, brooms and conveyers. Aerodynamic
problems that arise in the REGENERATIVE AIR SWEEPER are not as easily identified and,
therefore, necessitates a complete understanding of the machine.
The TYMCO REGENERATIVE AIR SWEEPER is designed to maintain cleaner surfaces at
higher speeds and at lower cost. The performance capability of this truly modern machine is
only limited by the initiative of those responsible for its operation. There are many different
conditions found in sweeping, and we believe it impossible to answer all of the problems
here. Most important in the operation and maintenance of this machine, is that it should be
KEPT CLEAN.
TheOperator’sManual includes the necessary checks, operating and adjustment procedures
neededbytheoperatorfromdaytoday.Foranyspecificadjustment,problem,ormaintenance
checks not explained in this manual, please refer to the Service & Parts Manual.
KEEP OUR STREAMS AND RIVERS CLEAN
PICK IT UP WITH YOUR TYMCO

TIL-099 / November 29, 2017
Complete Sweeper
Inspection
Check Auxiliary Engine Oil and
Coolant
Check for Seal Leaks
Check Warning And Work Lights
Inspect Pick-up Head
Check Gutter Broom
Adjust Mirrors
Fill Fuel Tank
Fill DEF Tank(s) (if equipped)
Fill Water System
Check Dustless Box, Pre-cleaner,
and Scavenge Hose
Sweeper Start-up
1. Lower Pick-Up Head using
Auxiliary Hydraulics
2. Start Rear Engine (Must be in
idle)
3. Turn on Warning Lights
4. Turn on DC System and Air
Purge System
5. Pull Sweeper Forward to Tuck
Pick up Head Curtains.
6. Turn on Water System
7. Throttle upAuxiliary Engine
RPM to desired levels. Wait
45 seconds before starting
sweeping.
8. Lower Gutter Broom (s)
9. Begin Sweeping
10. DO NOT BACK UPWITH
PICK-UP HEAD DOWN.
Throttle down, pick up head then
back up. (Reverse Pick-Up Head
Chains – allow you to back up
with the head down.)
Sweeper Shut Down
1. Lower Auxiliary Engine RPM to
idle speed (1100 RPM for Model
DST-4 and 1000 for Model DST-
6) and turn off Purge System
2. Raise Gutter Brooms (Must hold
switch in the up position to fully
retract gutter broom)
3. Turn offAuxiliary Engine
4. Turn on Auxiliary Engine Switch,
DO NOT start.
5.Using Auxiliary Hydrualic
System, raise Pick-Up Head.
6. Turn off Water System if on
7. Turn off Warning Lights
8. Turn offAuxiliary Engine Switch
Clean Out Procedures
(DAILY)
Clean Hopper Screens
Clean out Hopper
Clean out Dust Separator
Clean under Pick-up Head
Clean around gutter brooms
Clean Exterior of Sweeper and
Chassis
Clean off Radiators
Dustless Operations
(Shutdown)
Idle down auxiliary engine.
Turn on purge system and
listen for air guns to discharge
approximately every 17 seconds.
Allow purge system to operate for
approximately 5 minutes.
Check pressure relief port for
proper function.
Drain any accumulated moisture
from the water/air filter located at
the top of the filter assembly box.
Open pre-cleaner door and
CAREFULLY remove pre-cleaner
assembly. Shake off any dust
and if necessary, use “shop air”
to blow out any accumulation
of dust from pre-filter openings
and wash thoroughly. Must
be completely dry before next
sweeping day.
NOTE: Clean scavenge bin and
scavenge hose daily with water.
With fi
lter side door open, look
at the 4 Torit-Tex® filters, if
excessive amount of dust is
present, reassemble all hoses
and insure that all doors are
closed and latched and attach
shop air to the air hose fitting
located on left bottom of dust
box below air manifold tank.
Filters purge system can be run
without auxiliary engine running.
Auxiliary engine can also be used
to operate purge system after
system has been fully charged
(100 psi) if desired.
Always insure that on/off switch
is in the OFF position and purge
all air from the air tank before
beginning any service work in
dustless box assembly.
Check all water spray nozzles
daily to insure they are spraying
properly. (Never operate
gutter brooms without dust
control system engaged and all
water toggle switches in “on”
position.)
Parking Procedures
Leave Hopper Door and
Inspection Door(s) Open
Operating Procedures Guidelines
Model DST-6 & DST-4

TIL-064 / November 14, 2018
TYMCO REGENERATIVE AIR SWEEPER INSPECTION
AND REPETITIVE TASK SCHEDULE
Inspect
Gutter broom(s) for impact damage/
wear Daily
Pick-up head blast orifice for lodged
foreign material/adjustment Daily
Pick-up head skid plates for wear/
impact damage Daily
Pick-up head curtains for wear/
damage Daily
Hydraulic system for plumbing or
component leakage Daily
All hopper and transition seals for
wear/damage Daily
Hopper screen for damage Daily
Tires Daily
Hydraulic oil return line filter restriction Daily
Water pump oil level Daily (If applicable)
Water filler hose filter screen Daily (If applicable)
Water pump suction hose pre-filter Daily (If applicable)
Dust separator liner for wear/damage Daily (If applicable)
Dust separator door closed before
operating Daily (If applicable)
Engine air intake filter restriction
indicators Daily (If applicable)
Pick-up head turning vanes for wear/
foreign material Weekly
Blower belt tension
100 Hours
(Minimum)
(If applicable)
Pressure and suction hoses for wear 100 Hours
Blower wheel for wear/damage 100 Hours
Accessible areas of blower housing
liner for wear/damage 100 Hours
Blower lip for wear/damage 100 Hours
Perform
Cleaning of gutter broom torque motor
shaft area Daily
Check of hydraulic tank fluid level Daily
Draining water tank Daily
Cleaning of hopper and dust separator Daily
Wash down of engine radiator(s) Daily
Functional test sweeper lights Daily
Functional test truck brakes Daily
Functional test truck lights Daily
Check of truck fluid level Daily
Check of auxiliary engine fluid level Daily
(If applicable)
Rotation pressure and suction hoses
1/4 turn 100 Hours
Grease PTO driveshaft 100 Hours
(If applicable)
Change of water pump oil 150 Hours
(If applicable)
Change of hydraulic oil return line filter 1000 Hours or when
Indicated
Change of hydraulic system oil 2000 Hours or
by oil analysis
Adjustment of gutter brooms As required
Cleaning of spray nozzle tips and
screens As required

NEVER REACH INTO BLOWER HOUSING FOR ANY REASON!
!
ITEM DESCRIPTION RECOMMENDED SERVICE
1. Blower Bearings Grease once a week or every 25 hours of operation.
2. Blower Power Band Re-tension after initial 10 hours; then check every 100 hours.
3. Blower Wheel Inspect monthly for wear. DO NOT REACH INTO BLOWER HOUSING
FOR ANY REASON!
4. Gutter Broom / Wafer Check DAILY for string, cassette tape, etc on motor shaft. Re-tension
spring when new wafers are installed.
5. Hydraulic Reservoir Change oil every 2000 hours or by oil analysis recommendation. Check
oil level DAILY.
6. Hydraulic Oil Filter Change every 1000 hours or as indicated by restriction indicator.
7. Aux. Engine Air Cleaner Replace when restriction indicator shows red.
8. Auxiliary Engine Change oil every 100 hours, for additional service refer to engine man-
ual. Check oil level DAILY.
9. Console Fuse Panel Always replace fuse with identical amp rating.
10. Both Engine Radiators Check DAILY. CAUTION - Check only when cold.
11. Truck Air Cleaner Service every 25 hours or when restriction gauge indicates.
12. Transmission Change oil & filter every 15,000 miles or once a year.
13. Water Tank Drain tank DAILY.
14. Centrifugal Separator Wash out DAILY! Cleanout door provided on engine side.
15. Separator Seal Clean seal DAILY. Hopper must be airtight and fit snuggly against seal
when lowered.
16. Skimmer Hood Inspect DAILY! Skimmer hood must swing freely when hopper is raised
in order to clean itself of debris.
17. Hopper Screen Wash DAILY to prevent air blockage.
18. Hopper Wash out at end of each shift to prevent rusting.
19. Dump Door Seal Inspect DAILY; replace if damaged.
20. Hopper Pivot Hinge Grease every 25 hours of operation or once a week. CAUTION: Hop-
per must be raised in order to grease hinge. Always Install Pin in Lower
Safety Strut!
21. Truck Tires Check DAILY for flats and correct air pressure.
22. Spring Tension Check skid plates weekly for wear; adjust spring tension as required.
23. Pick-Up Head Curtains Inspect DAILY; replace when worn out .
24. Drag Link Inspect DAILY for condition
25. Truck Engine Change oil and filter every 100 hours or 3000 miles of operation.

TABLE OF CONTENTS
TYMCO REGENERATIVE AIR SYSTEM. . . . . . . . . . . . . . . . . . . . . . . . . . 1
TYMCO Model DST-4 System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Basic Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Routine Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Trouble Shooting Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Hopper Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Blower Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Hydraulic System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Power Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Gutter Broom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Pick-Up Head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Water System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Control System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45

2019 1 D4OPTRS
THE TYMCO REGENERATIVE AIR SYSTEM
DESCRIPTION
The blower generates a constant blast of high velocity air that is directed down the pressure
side of the machine and into the pick-up head. Blast air travels across the pick-up head,
picking up normal debris and refuse in its path and sending it up the suction side of the
machine.
At the same time that the blower is directing pressure down the pressure side, it is taking
air from inside the hopper, creating a suction; and consequently, it pulls debris up into the
hopper. The debris is deposited into the hopper while dusty air passes through the screen
to a multipass, centrifugal dust separator. The fines are then deposited back into the hopper
through the skimmer slot. Air, containing very fine dust, then moves into the blower and
repeats its cycle.
The unique REGENERATIVE AIR SWEEPER uses no restricting filters, resulting in more
energy to do your work. Since the blower is used to push and pull, restriction due to clogging
or modification to any of the air passages will greatly affect the sweeper’s performance. In
other words, PRESSURE FOR THE BLAST depends on ample volume of air through the
suction; SUCTION depends on the discharge of air from the blast orifice.
Another point to consider is the fact that a very small air leak at the dump door, inspection
doors, hand hose door, or suction hose will often cause a dusty condition. If the leak is severe
enough, air will have a slower velocity and performance will be lowered.
TYMCO REGENERATIVE AIR SWEEPER CAPABILITIES
We at TYMCO honestly believe that government officials, contractors and all personnel
directly responsible for the performance and maintenance of equipment in their charge are
concerned with all phases of their operation.
Sweepers are one of the most controversial pieces of equipment with reference to operating
cost, performance, and maintenance. The general public does not realize the problems and
depends on people knowledgeable in this area. You, therefore, the person responsible for the
performance and maintenance of the sweeper should use your knowledge and experience to
achieve the results expected.
The TYMCO REGENERATIVE AIR SWEEPER can achieve your anticipated results
while keeping cost at a minimum. However, to realize the full potential of the TYMCO
REGENERATIVE AIR SWEEPER, you must understand its capabilities and adhere
closely to operating and job functions for which it was designed.
Itisafactthata licensed driver can operate this equipment; however,westronglyrecommend
that the same driver operate it daily. It is proven that ability on the equipment is increased with
experience. We suggest that every operator thoroughly read and study the manual to make
sure that he/she understands its operation before ever attempting to operate the sweeper. It
is very important that every new operator be given this opportunity and that he does not rely
solely on methods of previous operators.
DO NOT ALLOW EVEN A SMALL AIR LEAK
CLEAN FRESH AIR DRAWN IN WILL BE DISCHARGED AS DUST
!

A TYMCO REGENERATIVE AIR SWEEPER can be expected to clean normal debris that
may accumulate on streets, parking lots, and other flat paved surfaces. Using the machine
for more than it was originally designed will cause excessive wear and failure to achieve the
desire results.
This sweeper is not a Vacuum Cleaner. Cleaning is actually done by a stream of high velocity
air the full width of the pick-up head. A blower furnishes both pressure and suction. Air
pressure from the blower passes over the surface being swept within the pick-up head,
blows up debris in its path, and the suction pulls it into the hopper, where it is separated. Air
continues on into the blower and the cycle is repeated.
The TYMCO REGENERATIVE AIR SWEEPER is not intended nor is it expected to replace
a shovel crew or a front end loader.An inspection at the dump site, however, may reveal that
there are rocks and large objects in the hopper. This is due to air currents in the TYMCO
REGENERATIVE AIR SYSTEM having the potential to pick up various large objects and
retain them. The mixture of light debris will sometimes boost the large objects into the air
stream and carry them into the hopper. Objects such as cans, bottles, glass, paper, leaves
and light stringy refuse or normal daily accumulation of debris are easily picked up by the
sweeper’s unique REGENERATIVE AIR SYSTEM.
We can not say what blower RPM or truck speed at which you can achieve your sweeper’s
full capabilities because of the various types of sweeping encountered. However, engine
RPM should not exceed 2000. For parking lot sweeping consisting of paper, broken glass,
cans, leaves, etc., engine RPM can be reduced as desired. The sweeper can be operated at
truck speeds up to 10 MPH without changing blower RPM. The above limits are intended for
smooth wide open spaces that are sparsely scattered with debris. Slower truck speeds are
advisable for curb and gutter work or where there are many obstacles. This prevents damage
and wear to pick-up head and gutter broom. Faster speeds may be necessary under your
particular conditions. However, you may expect considerably more wear, not only by the hour
as a result of more coverage, but also by the mile. The heat generated at higher speeds will
result in softening of the materials in contact with the surface. We would advise consideration
of these facts before allowing high speed operation, overloading and machine neglect.
SAVE FUEL, REDUCE NOISE, WEAR AND DUST.
OPERATE AT THE LOWEST POSSIBLE R.P.M. TO ADEQUATELY DO THE JOB.
D4OPTRS 2 2013

2019 3 D4OPTRS
DST-4 SYSTEM
FUNCTION
Sweepers equipped with the optional 435 Dustless Sweeping Technology (DST) allow the
pickup head to sweep virtually dust free without the use of external water spray nozzles. A
filter box assembly is located just behind the cab and is used to filter a small percentage of air
bled from the pressure side of the sweeper. Bleeding this air creates more suction beneath
the pickup head causing the dustless effect.
DESCRIPTION OF OPERATION
Control of the amount of air bled off is fully automated and requires the operator to simply
turn on the DST-4 control switch (labeled “DC” for short) at the sweeper console in the cab.
Turning on the DC switch activates a control system which opens and closes a flue plate
(See M01307) to control the amount of air bled from the pressure side of the sweeper. The
system has been set to bleed off the minimum amount of air required to maintain the dustless
sweeping effect regardless of blower RPM. The lower set point is 1.8 inches of water column
and the upper set point is 2.2 inches creating a 2 inch nominal setting. Should the operator
increase or decrease the blower RPM, the system reacts to open or close the flue plate to
maintain the 2 inch nominal reading. The set points are not adjustable.

D4OPTRS 4 2019
Should too little air be bled off, over pressure of the pickup head will occur and dust blow
out will result. Too much air bled off will decrease filter operational life as excess air flow will
deposit more dust on the filter media.
PRECLEANER
Theair which hasbeenbled offis sentthrougha centrifugalprecleanerthatrids theairofmost
dust particles before passing the air through four large filter cartridges and is then exhausted
to atmosphere. The precleaner also removes moisture from the air stream protecting the
filters and thereby allowing the sweeping of intermittent accumulations of water, such as
water puddles from sprinkler systems, without jeopardizing the filtration components.
The precleaner dumps the separated debris into a scavenge bin that has a scavenge
hose attached and routed back to the hopper. The hopper vacuum draws the dust from
the precleaner scavenge bin through the scavenge hose back to the sweeper hopper for
deposit. Proper performance of the precleaner requires that the scavenge hose be kept open
and free flowing. The precleaner should be removed once a day and dumped out to insure
good separation and unloading of dust into the scavenge bin. The scavenge bin then can be
inspected to see that it is NOT full of dust and that the scavenge hose is pulling the unloaded
dust back to the hopper. If the scavenge bin is full of dust, the scavenge hose has become
blocked and must be cleaned. The scavenge hose should be cleaned daily.
To insure the best operation of the precleaner, the HOPPER WATER should be turned on
and run whenever possible. The hopper water rids the air stream of a significant amount of
dust and reduces the particulate load seen by the precleaner.
Oncetheairhaspassedthroughtheprecleaner,itentersthefilterbox.Four(4)filtercartridges
on two separate rows make up the filter pack. Dust accumulating on the filter cartridges is
periodically purged by alternately discharging a high velocity back pulse of air into the filter
row. The back pulse of air dislodges the dust from the filter media and deposits it in the filter
box hopper.
M01507
M01307

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 filters be kept free flowing 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
filters back down to 3"-5" WC restriction and then proceed with sweeping. Depending on
the age of the filters, purging the filters clean could take from 5-15 minutes. Again, running
the hopper water will significantly increase the filter 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 filter 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 filters much quicker because no dirty air is flowing 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 filter pack without running the sweeper auxiliary engine. The shop air
must be regulated to 95-100 PSI, excessive pressure will damage the filter media! This
provision allows the filters 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 filtration box from over pressurization, a pressure relief port limits the
box pressure to 25 inch WC.
M01306
REPLACE PLUG
WITH APPROPRIATE
CONNECTOR

D4OPTRS 6 2019
M01309
PRECAUTIONS
TheTYMCODSTfeatureisintrinsicallysimpleandsafetooperate.However,afewoperational
and service precautions should be followed when working around the filter box area.
SAFETY
Do Not open the filter box large access door without first turning off the sweeper ignition key
on the sweeper control console in the cab. This prevents the high velocity purge back pulse
from discharging when in this area. A proximity sensor at the top of the service door also
prevents the purge system from engaging when the door is open.
Always bleed down the air tank pressure before working inside the DST box. Use the ball
valve at the shop fill port to drain the air tank.
Once the access door is open, turn off the service switch located on the bottom of the VMM
enclosure. (Illustration M01309). This turns off the power to the VMM control module and all
components of the DST system. If the door is open, with the sweeper ignition and the service
switch is in the on position, the DST Power Indicator Light will flash to indicate the system is
still active. If the Power Indicator Light is on solid, the purge system is active and could fire at
any time! This condition cannot occur with the door open, unless the service door proximity
switch is bypassed.
Use a dust mask when servicing the filters or precleaner or when cleaning out the filter box
hopper.
DOOR
PROXIMITY
SWITCH
AIR TANK
PRESSURE
TRANSMITTER
(BEHIND PULSE
VALVE “A”)
PULSE
VALVE “A”
PULSE
VALVE “B”
SCAVENGE
LINE
VALVE
DRAIN
VALVE
VMM
ENCLOSURE