TYMCO DST-6 User manual

TYMCO
P.O. BOX 2368, WACO, TEXAS 76703
(Shipping Address)
225 INDUSTRIAL EAST WACO, TEXAS 76705
PHONE: [phone] • FAX: [phone]
WEB SITE: www.tymco.com
E-MAIL ADDRESS: [email protected]
DUSTLESS
SWEEPING
TECHNOLOGY
DST-6
MODEL 600
OPERATOR'S
MANUAL
2008

CONGRATULATIONS
You have just purchased the finest AIR SWEEPER produced. Yet, for all of its advanced engi-
neering, in spite of all the skills that have gone into it — your sweeper is only as good as its oper-
ator.
TYMCO REGENERATIVE AIR SWEEPER SOLD & SERVICED BY:
MODEL DST-6
(Dustless Sweeping Technology)
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.
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 permis-
sion of TYMCO. Violators will be prosecuted to the full extent of the law.
Copyright, 1995,TYMCO
2008 EDITION

INTRODUCTION
To insure proper understanding of operation, cleaning and maintenance of your TYMCO RE-
GENERATIVE AIR SWEEPER, it is necessary that this Operator’s Manual and the Service &
Parts Manual be read and studied from cover to cover by the Operator. A full 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 uti-
lizes air instead of conventional rotary brushes, brooms and conveyers. Aerodynamic prob-
lems 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 con-
ditions 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.
The Operator’s Manual includes the necessary checks, operating and adjustment procedures
needed by the operator from day to day. For any specific adjustment, problem, or maintenance
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-053 / September 9, 2004
Operating Procedure Guidelines
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 Water System
Sweeper Start-Up Procedures
1. Start Rear Engine (Must be in idle)
2. Turn on Warning Lights
3. Turn on Water System
4. Lower Pick-Up Head
5. Pull Sweeper forward to tuck Pick-Up Head Curtains
6. Throttle up Auxiliary Engine RPM to desired levels
7. Lower Gutter Broom(s)
8. Begin sweeping
9. DO NOT BACK UP WITH PICK-UP HEAD DOWN. Throttle down, raise head then back up.
(Optional Reverse Pick-Up Head Chains allow you to back up with the head down.)
CNG Option Start-Up
1. Slowly open fuel service valve on each CNG fuel tank, if not already open.
2. Slowly open fuel shutoff valves 1/4 turn.
3. Start engine and idle for five minutes to allow time for warm-up before engaging transmission.
4. Start auxiliary engine and idle for five minutes to allow time for warm-up before raising RPM.
NOTE: This procedure supplements the sweeper Start-Up Procedure above. Read and comply with both.
Leaf Pressure Bleeder Procedures
• Closed for heavy debris such as Sand, Gravel, Dirt; Etc. (Use BAH when necessary)
• Open 100% when sweeping light debris such as Leaves, Paper Cups, Etc.
• Adjust opening 25% to 75% for mixed debris
Sweeper Shutdown Procedures
1. Lower Auxiliary Engine RPM to idle speed (1000 RPM)
2. Raise Gutter Brooms - (Must hold switch in the up position to fully retract gutter broom)
3. Raise Pick-Up Head - (Must hold switch to retract to the travel position)
4. Turn off Water System
5. Turn off Warning Lights
6. Turn off Auxiliary Engine
CNG Option Shutdown
1. Bring all sweeper components to their stowed position.
2. Lower engine RPM to idle on both engines for a minimum of 3 minutes to allow engine to cool down.
3. Ignition switches may now be turned off.
NOTE: If sweeper is to be parked in an enclosed area, close both 1/4 turn fuel shutoff valves and allow engines to
run until both shut down due to fuel starvation, then close the service valve on each CNG tank.
This procedure supplements the sweeper Shutdown Procedure above. Read and comply with both.
Wash Out Procedures (DAILY)
• Clean Hopper Screens
• Clean out Hopper
• Clean out Dust Separator
• Clean under Pick-Up Head
• Wash exterior of Sweeper and Chassis
• Wash off Radiators
Parking Procedures
• Raise Hopper and lower on 2x4 Wood Blocks - Do not close rear door (Model 210 - 435)
• Leave Hopper Door and Inspection Door(s) open (All Model 600s)

TIL-064 / August 4, 2006
TYMCO REGENERATIVE AIR SWEEPER INSPECTION
AND REPETITIVE TASK SCHEDULE
600 500X 435 210
ADJUSTMENT OF GUTTER BROOM(S) A/R A/R A/R A/R
CLEANING OF GUTTER BROOM D D D D
TORQUE MOTOR SHAFT AREA
ROTATE PRESSURE AND SUCTION 75 75 75 75
HOSES 1/4 TURN HRS HRS HRS HRS
CHECK OF HYDRAULIC TANK D D D D
FLUID LEVEL
CHANGE OF HYDRAULIC 100 100 100 100
SYSTEM FILTER HRS HRS HRS HRS
TANK BREATHER FILTER N/A 100 N/A N/A
HRS
RETURN LINE FILTER - RESTRICTION N/A 100 N/A N/A
INDICATOR HRS
CHARGE LOOP FILTER - RESTRICTION N/A 100 N/A N/A
INDICATOR HRS
HYDRAULIC SYSTEM OIL CHANGE 1000 1000 1000 1000
NOTE: INITIAL CHANGE AT 100 HRS HRS HRS HRS HRS
CHANGE OF WATER PUMP OIL 150 150 150 150
(IF APPLICABLE) HRS HRS HRS HRS
CLEANING OF SPRAY NOZZLE TIPS A/R A/R A/R A/R
AND SCREENS
DRAIN WATER TANK D D D D
CLEANING OF HOPPER AND DUST D D D D
SEPARATOR CHAMBER
AUXILIARY ENGINE FLUID LEVEL CK. D D D D
WASHDOWN OF ENGINE RADIATOR(S) D D D D
FUNCTIONAL TEST SWEEPER LIGHTS D D D D
FUNCTIONAL TEST OF TRUCK BRAKES D D D D
FUNCTIONAL TEST OF TRUCK LIGHTS D D D D
MOUNT TRUCK FLUID LEVEL CHECK D D D D
PERFORM MODEL
600 500X 435 210
GUTTER BROOM(S) FOR IMPACT D D D D
DAMAGE/WEAR
PICK-UP HEAD BLAST ORIFICE FOR D D D D
LODGED FOREIGN MAT'L/ADJUSTMENT
PICK-UP HEAD TURNING VANES 100 100 100 100
FOR WEAR/FOREIGN MATERIAL HRS HRS HRS HRS
PICK-UP HEAD SKID PLATES FOR D D D D
WEAR AND IMPACT DAMAGE
PICK-UP HEAD CURTAINS FOR D D D D
WEAR/DAMAGE
PRESSURE AND SUCTION HOSES 100 100 100 100
FOR WEAR HRS HRS HRS HRS
HYDRAULIC SYSTEM FOR PLUMB- D D D D
ING OR COMPONENT LEAKAGE
WATER PUMP OIL LEVEL D D D D
(IF APPLICABLE)
WATER FILLER HOSE FILTER D D N/A N/A
SCREEN
WATER PUMP SUCTION HOSE D D D D
PRE-FILTER
ALL HOPPER AND TRANSITION D D D D
SEALS FOR WEAR/DAMAGE
HOPPER SCREEN FOR DAMAGE D D D D
DUST SEPARATOR LINER FOR D D N/A N/A
WEAR/DAMAGE
DUST SEPARATOR DOOR CLOSED D D N/A N/A
BEFORE OPERATING
BLOWER WHEEL FOR 100 100 100 100
WEAR/DAMAGE HRS HRS HRS HRS
ACCESSIBLE AREAS OF BLOWER 100 100 100 100
HOUSING LINER FOR WEAR/DAMAGE HRS HRS HRS HRS
BLOWER LIP FOR WEAR/DAMAGE 100 100 100 100
HRS HRS HRS HRS
ENGINE AIR INTAKE FILTER D D D D
RESTRICTION INDICATORS
MOUNT TRUCK TIRES D D D D
INSPECT MODEL
D = DAILY
HRS = HOURLY INTERVALS
A/R = AS REQUIRED

TABLE OF CONTENTS
TYMCO REGENERATIVE AIR SYSTEM .................................... 1
TYMCO SWEEPER Capabilities........................................... 1
TYMCO Model DST-6 Introduction ......................................... 3
I. DST-6 Sweeper Operation....................................... 3
II. Sweeping Operation ........................................... 6
III. Daily Sweeper Washdown Procedure .............................. 7
IV. Routine Maintenance........................................... 9
Configuration Drawing.................................................. 14
Control Console Drawing & Switch Designation .............................. 15
Hopper Assembly ..................................................... 16
Blower Assembly ..................................................... 20
Hydraulic System ..................................................... 24
Power Unit Air Cleaner Service........................................... 27
Gutter Broom ........................................................ 29
Pick-Up Head ........................................................ 33
Dust Control (Water) System ............................................ 43
Hand Hose Operation .................................................. 46
Warranty ............................................................ 49

2008 1 DSTOPTRS
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 the blower is directing pressure on 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, centrifu-
gal dust separator. The fines are then deposited back into the hopper through the skimmer slot.
Air, containing very fine dust, passes through the filters to remove any remaining dust particles
before entering into the blower and repeating its cycle.
The unique REGENERATIVE AIR SWEEPER uses both the blower exhaust and vacuum, re-
sulting 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 machines perfor-
mance. 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.
DO NOT ALLOW EVEN A SMALL AIR LEAK
CLEAN FRESH AIR DRAWN IN WILL BE DISCHARGED AS DUST
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 de-
pends on people knowledgeable in this area. You, therefore, the person responsible for the
performance and maintenance of your 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 potentials of the TYMCO REGENERA-
TIVE AIR SWEEPER, YOU MUST UNDERSTAND ITS CAPABILITIES AND ADHERE
CLOSELY TO OPERATING AND JOB FUNCTIONS FOR WHICH IT WAS DESIGNED.
It is a fact that a licensed driver can operate this equipment; however, we strongly recommend
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 understands the 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.

DSTOPTRS 2 2008
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 desired
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 RE-
GENERATIVE 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 condi-
tions. 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 soften-
ing 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.

2008 3 DSTOPTRS
TYMCO MODEL DST-6 INTRODUCTION
The TYMCO MODEL DST-6 is a closed loop air sweeper, therefore it is important that all doors
and components attached to the hopper have rubber seals for proper sweeper operation. All
hopper doors must be completely closed for proper sweeper function. It is important that the op-
erator become familiar with all seal areas used on the sweeper and keep them in good repair.
DST-6 SWEEPER OPERATION
WARNING! Operator must use all standard safety precautions and observe all
warning decals to avoid serious injury when working around the
sweeper.
All DST-6 Sweepers have an auxiliary electric hydraulic pump for running hydraulic compo-
nents without having to start the auxiliary engine. A switch on the sweeper control panel
switches sweeper from engine to auxiliary hydraulic system. The auxiliary engine will not
start if this switch is not properly reset.
A. DST-6 PRE-START CHECK LIST
Only personnel trained for operating the Model DST-6 using proper safety proce-
dures should be allowed to perform sweeper inspection.
1. Check truck and auxiliary engine oil levels.
2. Check radiator fluid levels, make sure radiator core fins are clean.
3. Check filter restriction indicator on both engines.
4. Check all tires for proper air pressure.
5. Check all truck lights for proper function.
6. Check sweeper hydraulic fluid level and color. Fluid should be clear not milky.
7. Check DST-6 air compressor oil level, do not over fill sump!
8. Check that sweeper dust separator inside the sweeper hopper is clean.
NOTE: Always close separator door before closing the dump door!
CAUTION: Never sweep with separator door open or improperly closed or
severe blower damage and component wear will result.
9. Check condition of the sweeper hopper rubber seals, especially the inspection
door seals on both sides of the hopper, the dump door seal and the rear hand
hose door seal. Also inspect the condition of the 14" pressure and suction
hoses as well as the condition of the 8" DST transfer hose from the pressure
ring to box inlet.
10.Unlatch the sweeper suction transition and inspect hose to make sure it is free
of any debris.

DSTOPTRS 4 2008
11.With suction transition removed, check
the vacuator manifold screen rock
guard for any obstruction and clear if
necessary. Close vacuator manifold
ball valve. See Photo M01361.
12.Operator should make sure the
vacuator hose and scavenge hose are
clear and free flowing before beginning
to sweep. Both cleanout ports expan-
sion plugs must be reinstalled. See
Photo M01362.
13.Check flue plate operation. Open the
large access door, switch the sweeper
ignition to run position and turn on the
dustless switch found at the control
panel. Flue plate should open all the
way. Turn off dustless switch and the
flue plate should close. (Photo
M01307)
NOTE: The flue plate takes 45 sec-
onds to travel from full closed to full
open. If the flue plate fails to move,
make sure service switch on the side of
heat box is on (green light next to
switch indicates on).
14.With the pick-up head in raised posi-
tion, check blast orifice gap underneath
head and remove any rocks or obstruc-
tions. For best sweeping, a severely
worn or damaged blast orifice must be
repaired. Check skid plates for proper
setting and inspect for wear. Skid
plates may be rotated from side to side
to even out wear on the carbide
runners.
M01361
M01362
M01307
15.It is important to check the pick-up head curtains for excessive wear. DST
sweepers will not perform dustless if the pick-up head seal curtains are worn out.
16.Inspect the condition of the gutter broom bristles, replace if bristles are shorter
than 6".
CAUTION! Using incorrect gutter broom bristles or bristles that are too
short can lead to expensive pick-up head repairs, especially
when sweeping the curb or badly overlaid streets.
The smaller diameter of a worn broom causes operator to ride in on curb allowing
the pick-up head skid plate to fall into the gutter causing the pick-up head to be
dragged unevenly on the road surface which quickly wears the pick-up head seal
curtains and can cause wear to the bottom sheet metal panel of the pick-up
head.

2008 5 DSTOPTRS
17.When filling the sweeper dust control system water tank, make sure the drain
valve is closed. If the sweeper is equipped with a water system air purge option,
make sure the manual actuated valve is set to sweep position when the system
is not being purged.
18.Check fuel tank level and top off if necessary.
B. DST-6 SWEEPER RUNNING CHECKS
Use the auxiliary hydraulic system to lower the pick-up head before cranking the
auxiliary engine. This will prevent dust from blowing out from under the pick-up head
when auxiliary engine is started.
1. Start the auxiliary engine and allow to
run, set RPM at 1800. Turn on the DC
mode switch. Observe the pressure
gauge on the sweeper console to climb
to 95-100 PSI and stop. Turn on the fil-
ter purge switch 15-17 seconds after
turning on the purge switch a loud pop-
ping sound should occur indicating the
DST-6 filter purge system is working.
NOTE: A safety interlock system re-
quires the large access door to be
closedbefore the purge system will dis-
charge. (Photo M01363)
2. A Minihelic filter restriction indicator
gauge is located next to the pressure
gauge. Restriction readings below 6"
water column indicate good filters.
Readings of 6" to 8" should be pulsed
down below 6". To pulse filters, stop
forward travel and allow pulse to purge
the system 5 to 15 minutes before pro-
ceeding to sweep. (Photo M01376)
NOTE: Sweeper may not sweep dust-
less if filter restriction is 9" or above!
Readings above 9" may require opera-
tor to remove and wash the 4 large fil-
ters to reduce filter restriction down
into the sweepable range.
3. After the sweeper has run for several
minutes, check the photohelic gauge
face located on the DST-6 filter box
just behind the Left-hand driver seat.
The black indicator needle should be
between the two red set point needles.
(Photo M01314)
M01363
M01314
M01376

DSTOPTRS 6 2008
4. Check the gutter brooms for proper function. Back off the gutter broom eyebolt
for more down pressure and reach if needed.
5. If unit is equipped with a BAH (Broom Assist Head), check broom pattern and
reset if necessary. See Broom Assist Daily Service under Pick-Up Head section
for instructions to set the broom pattern.
6. Turn on the water system and check all spray nozzles for correct spray pattern,
especially the hollow cone hopper water nozzle for water output.
SWEEPING OPERATION - DST-6
The DST-6 has been designed to sweep in two separate operational modes, the dustless
mode option where the sweeper performs with very little blow-out of dust around the pick-up
head and a standard sweeping mode for sweeping in wet weather or any other condition
not requiring dustless operation.
A. DUSTLESS MODE OPERATION:
Drive sweeper to street location, using the auxiliary hydraulic system (AHS), lower
the pick-up head and pull sweeper forward to seat the pick-up head rubber seal cur-
tains. Switch off AHS switch, switch on the DC mode switch and start the auxiliary
engine. Set Engine at 1800 RPM and observe pressure gauge at the top of the con-
trol panel. When the needle reads 95-100 PSI, switch on the purge switch. Turn on
the water system main switch and hopper water switch. Sweeper is ready for opera-
tion in dustless mode. Turn on the appropriate gutter brooms and water nozzles.
CAUTION! Do not back up sweeper with the pick-up head or gutter brooms
in down position or severe damage may occur!
While sweeping, monitor filter condition by observing the filter restriction gauge at the
top of the console next to the pressure gauge. If the sweeper starts making exces-
sive dust and restriction indicator needle is above 8", stop forward travel and throttle
down to 1400 RPM. Allow the unit to pulse filters for five minutes. This should reduce
filter restriction and allow the sweeper to resume sweeping.
Continue to sweep until route is
cleaned or hopper load indicator light
and siren come on. Do Not over-
load and overfill the hopper. Dump
the unit when the hopper load indica-
tor comes on! Overfilling the hopper
will cause severe wear damage to
the blower and blower housing com-
ponents. (See M01377)
At the dump site, completely empty
the hopper by opening and closing
the dump door several times. Next,
open left side inspection door and
raise separator door using the pull
cable. Slam the separator door
closed by pulling out cable handle
M01377

2008 7 DSTOPTRS
and releasing allowing separator door to
slam closed. Do this several times to
knock any debris from the separator
door skimmer slot.
Check the dustless box load by opening
the cleanout door on the right-hand side
of the dustless box. Use a squeegee to
pull any debris in the box down into the
vacuation bin. (See Photo M01364) In-
stall the half shutter plate (stored in the
cab) (Photos M01365 & M01366) and
open the ball valve on the vacuation
manifold which allows the operator to
draw dust into the large sweeper hopper
(Photos M01369 & M01370). With the
pick-up head down, throttle up the
sweeper and allow the hopper vacuum
to empty the vacuation bin.
M01364
M01365 M01366
M01369
M01370

DSTOPTRS 8 2008
AVAC PURGE switch on the console
aids the cleaning of the vacuator bin by
blowing high pressure air into the
vacuation hose inlet. (Photo M01367)
This procedure may have to be repeated
several times to empty the vacuator bin.
M01367
B. STANDARD MODE OPERATION:
The standard mode operation allows the sweeper to sweep in continuously wet
conditions (light rain or after flusher truck, etc.) where the dustless function is not
required. The DST-6 flue plate closes and very little exhaust air goes through the
DST-6 box. For standard mode, use the same procedures described previously,
except DO NOT turn on DC mode switch or purge switch.
CAUTION! Do Not attempt to open the DST-6 box large access door with
sweeper in the standard mode. High static pressure is created
when the flue plate is closed and the sweeper auxiliary engine
is running. The high pressure will blow the access door open
quickly and potentially cause injury to anyone struck by the door.
DAILY SWEEPER WASHDOWN PROCEDURE:
A. HOPPER CLEANING
As a rule, the sweeper must be thor-
oughly washed out after each shift.
A four nozzle deluge system is
provided requiring a high volume wa-
ter source such as a fire hydrant. At-
tach a hydrant hose to the hopper
deluge connector and open hydrant.
Let water run for 60 seconds with the
door closed. Using the auxiliary hy-
draulic system gradually step the
dump door open approximately 4" to
6" at a time, allowing 20 to 30 sec-
onds at each step for flushing until
the door is fully opened. (Photo
M01368)
M01368

2008 9 DSTOPTRS
Using the cable and handle provided at the left side inspection door, open the separa-
tor door and lock in the second cable bead position. Step the dump door closed as when
opening. Failure to open the separator door when washing out the hopper can cause de-
bris to collect in the separator chamber, inhibiting the separator to spin out dust, there-
fore causing rapid wear of the blower housing components.
After using the hopper deluge system, a hand held high volume/high pressure hose
should be used to remove any debris left by the hopper deluge.
B. DST-6 COMPONENTS
Uncouple the suction transition and using
the hand held wash hose, wash out the
suction tube leading from the pick-up head
to the hopper inlet. The vacuator manifold
rock screen must also be washed clean.
Remove the cleanout plugs from the vac-
uator bin and the scavenge hose cleanout
tee (Photo M01378). Back flush the vac-
uator hose and scavenge hose observing
water running out the cleanout ports. Close
the vacuator manifold ball valve once the
vacuator hose has been washed out. (Pho-
tos M01369 & M01370)
Remove the pre-filter panel from the DST-6
box and thoroughly clean making certain
to remove all dirt and grass debris from the
small tubes on the panel face. Clean out
the scavenge bin which is the area in the
DST-6 box just under the pre-filter. The
scavenge hose must be flushed out and
clear before reinstalling pre-cleaner. (Photo
M01371)
C. DST-6 FILTERS
The DST-6 uses special filters to clean the
exhaust air before it is released into the
atmosphere. The filters utilize a PTFE mem-
brane which gives the filter good release
characteristics as well as protection from
water damage. The filters are actually wa-
terproof and can be washed by low pres-
sure hose and returned to the sweeper with-
out drying. Should mud dry on the filters,
soak the filter until the mud softens, then
wash off with low pressure water hose.
(Photo M01372)
The filter PTFE membrane is fragile and
over-servicing the filter can cause the PTFE
membrane to fail. Care should always be
used when handling the filter as the PTFE
M01371
M01372
M01378

DSTOPTRS 10 2008
membrane is on the exterior side of the filter and can be easily scraped off. Use
care not to drop the filter or otherwise damage the filter’s metal ends.
ROUTINE MAINTENANCE
A. HOPPER SEALS
Even a small seal leak can reduce sweeper efficiency, operator should be diligent by
inspecting sweeper seal condition daily! To check seal, slip a small piece of paper,
such as a dollar bill, between the door seal and jam. Latch the door and pull on the
paper. The paper should be clamped between the door seal and jam very tightly
indicating a good seal. Do this at all four corners and in the middle of the door to
make sure there is a good seal all around.
1. Inspection Door Seal - See below for proper setting and adjustment of inspection
door.
Refer to Drawing M00321OP. Each inspection door should be airtight. Normally,
once a door has been adjusted, simply replacing a torn or worn seal usually
solves most problems. However, if needed, adjust door by loosening the bolts
and rotating eccentric cam for up and down alignment and adjust slots for in and
out to make contact with the seal all the way around the door. Add service life to
door seals by leaving doors open when sweeper is parked and not in use.
2. Hand Hose Door Seal - The optional hand hose shutter door must be closed
when sweeping. Leaving the hand hose attachment connected to the hopper will
cause poor performance and excessive dust when sweeping. Adjust “J” bolt in to
tighten door for better seal.
3. Dump Door Seal - The large dump door of the TYMCO Model DST-6 uses a large
rubber seal glued into the dump door channel of the hopper. Add service life to
the dump door seal by leaving the door partially open when the sweeper is parked
and not in use.
4. Transition Seal - Two replaceable transitions adapt the sweeper’s square hopper
openings to the round suction and pressure hoses leading to the pick-up head. A
rubber sealing gasket is used to produce an airtight fit between the transition and
the hopper opening.
The pressure transition is bolted on for safety and the suction transition has a
quick disconnect design for easy access and cleaning. Longer service life of the
transition can be obtained by rotating the transition 180 degrees once a month for
more even wear.