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PARTSMANUALFOR18DT, 20DT, 24DT &20DTA, 24DTA1101 HERITAGE PARKWAY MANSFIELD, TX 76063 800-433-5384
A note from Interstate Trailers to our valued dealers and customers.The scope of this manual is to provide parts and service informationfor year model 1998 and newer DT/DTA series trailers. We havemade our best effort to document the common replacement parts forthese trailers. However, Interstate Trailers Inc. builds many customtrailers which may be equipped with parts and options not listed inthis manual. Also, trailers older than model year 1998 have somedifferences and will require help from the factory staff to locate thecorrect parts. If you encounter such a situation please call ourfactory at 1-800-433-5384 between the hours of 8 a.m. to 5 p.m.standard time, M-F excluding holidays. Interstate Trailersrecommends that you always have your VIN number (trailer serial)ready when calling a dealer or the factory to assist in locating thecorrect parts for your trailer. Interstate Trailers will make everyeffort to help find the correct replacement parts for your trailer andwill strive to make your ownership experience as trouble free aspossible.*In April of 2000 Dexter Axle made a design change to the electric brakes used onall trailers with electric brakes listed in this catalog. This manual covers only thenew style (post 04/2000) brakes. The difference is the construction of the backingplate, pre 04/2000 the backing plate was a stamped sheet metal plate and post04/2000 the backing plate changed to a sand cast steel plate. The brakecomponents differ between the types so please check your trailer prior to orderingparts to insure accuracy.Contact InformationInterstate Trailers Inc.1101 Heritage parkwayMansfield, TX 760631-800-433-5384 phone817-453-2672 parts department faxwww.interstatetrailers.com web addressThank you!The Interstate Trailers team.
DT/DTA PARTS MANUAL INDEXSUBJECTPAGE18DT HUB, DRUM, AND WHEEL120DT HUB, DRUM, AND WHEEL224DT HUB, DRUM, AND WHEEL318DT ELECTRIC BRAKE COMPONENTS420DT ELECTRIC BRAKE COMPONENTS524DT ELECTRIC BRAKE COMPONENTS620DTA AIR BRAKE COMPONENTS724DTA AIR BRAKE COMPONENTS820/24DTA AIR SYSTEM COMPONENTS9DT HARNESS DIAGRAM10DT ELECTRICAL WIRING SCHEMATIC11DTA HARNESS DIAGRAM12DTA ELECTRICAL WIRING SCHEMATIC13DT/DTA SUSPENSION14LANDING GEAR15LIGHTING16MISCELLANEOUS PARTS17HITCH AND RAMP COMPONENTS18TWO WAY SPRING ASSIST19GOOSENECK HITCH AND PARTS20DECAL KITS AND APPEARANCE21MAINTENANCE SCHEDULE22
18DT HUB & DRUMITEM#QTY 24432444844843210.2005DESCRIPTIONPARTNUMBERHUB OIL SEALINNER BEARING CONEINNER BEARING CUPCOMPLETE ELEC. BRAKE ASSEMBLY, ROAD SIDECOMPLETE ELEC. BRAKE ASSEMBLY, CURB SIDEBRAKE MOUNTING NUTBRAKE MOUNTING BOLTDRUM ATTACHING BOLTBRAKE DRUMHUB, WITH CUPS AND STUDSWHEEL STUDOUTER BEARING CUPOUTER BEARING CONESPINDLE WASHERBEARING LOCKNUTSPINDLE LOCK WASHERHUB OIL CAP ASSEMBLYDUAL WHEEL, 16" X 6"WHEEL CLAMP RINGWHEEL 26352627222722172237226515152837517
20DT/DTA HUB & DRUMITEM#QTY 322243244484484321.2007DESCRIPTIONPARTNUMBERHUB OIL SEALINNER BEARING CONEINNER BEARING CUPCOMPLETE ELEC. BRAKE ASSEMBLY, ROAD SIDECOMPLETE ELEC. BRAKE ASSEMBLY, CURB SIDEBRAKE MOUNTING NUTBRAKE MOUNTING BOLTDRUM ATTACHING BOLTBRAKE DRUM, WITH ABS (FRONT, DTA ONLY)BRAKE DRUM, NON ABSHUB, WITH CUPS AND STUDSWHEEL STUDOUTER BEARING CUPOUTER BEARING CONESPINDLE WASHERBEARING LOCKNUTSPINDLE LOCK WASHERHUB OIL CAP ASSEMBLYDUAL WHEEL, 16" X 6"WHEEL CLAMP RINGWHEEL 520749674955294751175127226515152837517
24DT/DTA HUB & DRUMITEM#QTY 322243244484484321.2007DESCRIPTIONPARTNUMBERHUB OIL SEALINNER BEARING CONEINNER BEARING CUPCOMPLETE ELEC. BRAKE ASSEMBLY, ROAD SIDECOMPLETE ELEC. BRAKE ASSEMBLY, CURB SIDEBRAKE MOUNTING NUTBRAKE MOUNTING BOLTDRUM ATTACHING BOLTBRAKE DRUM, WITH ABS (FRONT DTA ONLY)BRAKE DRUM, NON ABSHUB, WITH CUPS AND STUDSWHEEL STUDOUTER BEARING CUPOUTER BEARING CONESPINDLE WASHERBEARING LOCKNUTSPINDLE LOCK WASHERHUB OIL CAP ASSEMBLYDUAL WHEEL, 16" X 6"WHEEL CLAMP RINGWHEEL 520750975105294751175127226515152837517
18DT ELECTRIC BRAKEITEM#QTY PARTNUMBERBRAKE MOUNTING NUTBRAKE MOUNTING LOCK WASHERWIRE GROMMETDUST SHIELDCAST BACKING PLATECENTERING SPRINGBRAKE MOUNTING BOLTCENTERING SPRINGBRAKE SHOE KIT, ROADSIDEBRAKE SHOE KIT, CURBSIDEADJUSTER CLIP, THREAD ENDBRAKE ADJUSTER, ROADSIDEBRAKE ADJUSTER, CURBSIDEADJUSTER CLIP, BARREL ENDBRAKE SHOE RETURN SPRINGWIRE CLIPACTUATOR ARM, ROADSIDEACTUATOR ARM, CURBSIDEARM/SHOE RETAINER, ROADSIDEARM/SHOE RETAINER, CURBSIDEFLANGE NUTMAGNET, KITADJUSTER CABLEADJUSTER LEVER, ROADSIDEADJUSTER LEVER, CURBSIDEADJUSTER LEVER 7555-17547-17546-17548-17536-1
20DT ELECTRIC BRAKEITEM#QTY PARTNUMBERBRAKE MOUNTING NUTBRAKE MOUNTING LOCK WASHERWIRE GROMMETDUST SHIELDCAST BACKING PLATECENTERING SPRINGBRAKE MOUNTING BOLTCENTERING SPRINGBRAKE SHOE KIT, ROADSIDEBRAKE SHOE KIT, CURBSIDEADJUSTER CLIP, THREAD ENDBRAKE ADJUSTER, ROADSIDEBRAKE ADJUSTER, CURBSIDEADJUSTER CLIP, BARREL ENDBRAKE SHOE RETURN SPRINGWIRE CLIPACTUATOR ARM, ROADSIDEACTUATOR ARM, CURBSIDEARM/SHOE RETAINER, ROADSIDEARM/SHOE RETAINER, CURBSIDEFLANGE NUTMAGNET, KITADJUSTER CABLEADJUSTER LEVER, ROADSIDEADJUSTER LEVER, CURBSIDEADJUSTER LEVER 437555-17547-17546-17548-17536-1
24DT ELECTRIC BRAKEITEM#QTY PARTNUMBERBRAKE MOUNTING NUTBRAKE MOUNTING LOCK WASHERWIRE GROMMETDUST SHIELDCAST BACKING PLATECENTERING SPRINGBRAKE MOUNTING BOLTCENTERING SPRINGBRAKE SHOE KIT, ROADSIDEBRAKE SHOE KIT, CURBSIDEADJUSTER CLIP, THREAD ENDBRAKE ADJUSTER, ROADSIDEBRAKE ADJUSTER, CURBSIDEADJUSTER CLIP, BARREL ENDBRAKE SHOE RETURN SPRINGWIRE CLIPACTUATOR ARM, ROADSIDEACTUATOR ARM, CURBSIDEARM/SHOE RETAINER, ROADSIDEARM/SHOE RETAINER, CURBSIDEFLANGE NUTMAGNET, KITADJUSTER CABLEADJUSTER LEVER, ROADSIDEADJUSTER LEVER, CURBSIDEADJUSTER LEVER 5875437539-17547-17546-17548-17536-1
20DTA AIR BRAKESITEM#QTY 222210.2005DESCRIPTIONPARTNUMBERCAMSHAFT, ROADSIDE -28 SPLINECAMSHAFT, CURBSIDE -28 SPLINEBRAKE SHOE, 12.25 X 4" "PQ"BRAKE CAMSHAFT REBUILD/SERVICE KITCAMSHAFT RETAINER PLATE NUTCAMSHAFT RETAINER PLATE LOCKWASHERCAMSHAFT RETAINER PLATECAMSHAFT RETAINER PLATE BOLTSLACK ADJUSTER, 28 SPLINE AUTOMATICSPRING BRAKE CHAMBER 20/24BRAKE SHOE HARDWARE KITLOWER ABS MOUNTING BLOCKABS SENSOR MOUNTING BLOCK BOLTABS SENSOR RETAINER CLIPABS SENSOR, 90 DEGREE WIREABS TONE RINGUPPER ABS SENSOR MOUNTING 00070047002700370067001
24DTA AIR BRAKESITEM#QTY 222210.2005DESCRIPTIONPARTNUMBERCAMSHAFT, ROADSIDE -28 SPLINECAMSHAFT, CURBSIDE -28 SPLINEBRAKE SHOE, 12.25 X 5" "PQ"BRAKE CAMSHAFT REBUILD/SERVICE KITCAMSHAFT RETAINER PLATE NUTCAMSHAFT RETAINER PLATE LOCKWASHERCAMSHAFT RETAINER PLATECAMSHAFT RETAINER PLATE BOLTSLACK ADJUSTER, 28 SPLINE AUTOMATICSPRING BRAKE CHAMBER 24/30BRAKE SHOE HARDWARE KITLOWER ABS MOUNTING BLOCKABS SENSOR MOUNTING BLOCK BOLTABS SENSOR RETAINER CLIPABS SENSOR, 90 DEGREE WIREABS TONE RINGUPPER ABS SENSOR MOUNTING 5700070047002700370067001
20/24DTA AIR SYSTEMITEM#QTY NPARTNUMBERSERVICE GLADHANDSERVICE AIR HOSE ASM. W/GLADHAND & FITTINGSBULKHEAD FITTING AND ELBOW FITTINGSERVICE AIR FILTERAIR TANKSPRING BRAKE CONTROL VALVEABS VALVE/MODULE ASSEMBLYEMERGENY AIR FILTEREMERGENY AIR HOSE ASM. W/GLADHAND & FITTINGSEMERGENCY GLADHANDAIR HOSE, VARIOUS SIZES -CALL 360
DT HARNESS DIAGRAM10.2005ITEM#QTY 2121DESCRIPTIONPARTNUMBERBREAK A WAY PULL PINBREAK A WAY SWITCH ONLYBREAK A WAY SWITCH AND PIN ASSEMBLYNOSE HARNESS 7-WAY STANDARDNOSE HARNESS 6-WAY OPTIONALBREAK A WAY BATTERY, BOX, AND HARNESS (INCLUDES ITEMS 1,2)BREAK A WAY LEAD OUT HARNESSJUNCTION BOX LEAD OUT HARNESSJUNCTION BOX, INCLUDES CIRCUIT BREAKERSFRONT MARKER LIGHT HARNESSELECTRIC BRAKE LEAD OUT HARNESSMAIN HARNESS, WITH JUNCTION BOXCENTER MARKER HARNESSTANDEM BRAKE HARNESSMARKER HARNESS EXTENSIONREAR HARNESS (INCLUDES 15,16,17)CORNER MARKER HARNESSREAR CENTER MARKER 1081280101-31451031460104-10122-20126-2
DT/GDT WIRING DIAGRAM10.2005
DTA/GDTA HARNESS DIAGRAM8.2006ITEM#QTY PARTNUMBERNOSE HARNESS 7-WAY STANDARDNOSE HARNESS 6-WAY OPTIONALJUNCTION BOX LEAD OUT HARNESSFRONT MARKER LIGHT HARNESSMAIN HARNESS, WITH JUNCTION BOX72" ABS SENSOR EXTENSION HARNESSCENTER MARKER HARNESSABS ECU POWER WIREABS MAIN HARNESSREAR HARNESS (INCLUDES 9,10,11)CORNER MARKER HARNESSREAR CENTER MARKER HARNESSMARKER HARNESS 100-10104-10122-20126-2146
DTA/GDTA WIRING DIAGRAM10.2005
DT/DTA SUSPENSIONITEM#QTY 0.2005DESCRIPTIONPARTNUMBERFRONT HANGER3-LEAF SPRINGAXLE SEATU-BOLT WITH NUTS AND WASHERSCENTER HANGER WITH EQUALIZERREAR HANGERBOTTOM PLATETORQUE ARM BOLTTORQUE ARM NUTFIXED TORQUE ARMADJUSTABLE TORQUE ARMTORQUE ARM BUSHINGREBOUND BOLT WITH SLEEVE AND NUTEQUALIZER WITH BUSHINGEQUALIZER BUSHINGEQUALIZER BOLT 2-15125-351255125-25125-1
LANDING GEARITEM#123455.2006DESCRIPTIONPARTNUMBERJACK HANDLE, FITS ALL SIDEWIND JACKSTWO SPEED 25K JACK WITH DROP FOOT10K TOPWIND JACK WITH DROP FOOT12K SIDE WIND JACK WITH DROP FOOT25K TWO SPEED JACK SET INCLUDES BOTH JACKS,CROSS SHAFT, HANDLE, AND HEADBOARD MOUNTS56487129711471307125-1
ERTAG LIGHT4" TAIL LIGHT MOUNTING GROMMET4" INCANDESCANT TAIL LIGHT2" INCANDESCANT MARKER LIGHT, RED2.5" INCANDESCANT MARKER LIGHT, RED2.5" INCANDESCANT MARKER LIGHT, AMBER2.5" MARKER LIGHT MOUNTING GROMMET4" L.E.D. TAIL LIGHT2" L.E.D. MARKER LIGHT, RED2.5" LED MARKER LIGHT, RED2.5" LED MARKER LIGHT, 27071-2
MISCELLANEOUS PARTSITEM#11123410.2005DESCRIPTIONPARTNUMBERTIRE, 245/75R16 -10PLYDUAL WHEEL, 16 X 6"WHEEL AND TIRE ASSEMBLYD-RING AND CLIP3/8" SAFETY HOOK WITH LATCH3/8" SAFETY CHAIN WITH HOOK6148-151516148-2479268514732
HITCH AND UMBERPINTLE HITCH, NO HARDWAREPINTLE HITCH, WITH HARDWARE (2-7)HITCH BOLTHITCH BACKING PLATE1.5" LOCK WASHER1.5" NUT1.75" LOCK WASHER1.75" NUTNOSE PLATE, WITH CHAIN ANCHORS (NOT SHOWN)RAMP LINKAGE ASSEMBLYLOADING RAMP, WOOD DECKLOADING RAMP, STEEL DECK (SHOWN)RAMP PIVOT PINRAMP LIFT ASSIST 137113-14640-14638
TWO WAY SPRING ASSIST SYSTEMITEM#QTY PERRAMP122345111111DESCRIPTIONPARTNUMBERLEFT SIDE (OF LINKAGE) SPRINGRAMP PIN, SINGLE GROOVERAMP PIN, TWO GROOVESLINKAGE MID SECTION (SHADED)RIGHT SIDE (OF LINKAGE) SPRINGRAMP PIN, CROSS DRILLED ON EACH END*4638-14640-94640-84897-24638-24623*THIS PIN MUST BE MEASURED PRIOR TO ORDERINGAS SOME TRAILERS HAVE DIFFERENT WIDTHLINKAGES.*THIS TWO WAY SPRING ASSIST BECAME AVAILABLEAS A FACTORY OPTION FOR THE 2005 MODEL YEAR,HOWEVER IT CAN BE RETRO FITTED TO OLDERTRAILERS. CALL FACTORY FOR DETAILS.5.2006
GOOSENECK HITCH PARTSITEM#123410.2005DESCRIPTIONPARTNUMBERHANDLE, 1" INPUT SHAFTHITCH, COMPLETE ASSEMBLY INCLUDES ITEMS 1,3,4INNER LEG, WITH MANUAL COUPLERBAIL PIN, FOR MANUAL COUPLER7140-1712471277168
DECAL KITITEM#1DESCRIPTIONPARTNUMBERDECAL KIT, ALL DT SERIES TRAILERSMUST SPECIFY MODEL WHEN ORDERING6096-1INTERSTATE GRAY PAINT CODE:DUPONT 57704 INDUSTRIAL ENAMELINTERSTATE BLACK PAINT CODE:UNIVERSAL PAINT CODE 99 GLOSS BLACK ENAMEL10.2005
MAINTENANCE SCHEDULETIRESWHEEL LUGSWHEEL BEARINGS- CHECK DAILY - MAINTAIN 235/85R16 AND 245/75R16 TIRES @ 80 PSI COLD.- CHECK WEEKLY - LIGHTLY GREASE STUDS TORQUE TO 200 FL. LBS.- CHECK OIL LEVEL DAILY. USE SAE 80W-90 API-GL-5 OILBRAKES- SHOULD BE CHECKED FOR ADJUSTMENT MONTHLY. BRAKE LININGS SHOULDBE REPLACED WHEN LININGS ARE WORN TO RIVET HEADS (AIR) OR BACKINGPLATE (ELECTRIC). DO NOT WEAR LININGS PAST RIVET HEADS OR INTOBACKING PLATE.MAGNETS- CHECK AT ANY INDICATION OF BRAKE PROBLEMS, AT BRAKE REPLACEMENTBEARING INSPECTION, OR ANY TIME A HUB IS PULLED. MAGNETS SHOULD BEREPLACED IF BARE WIRE IS SHOWING AT WEAR SURFACE, SURFACE OF MAGNETIS GOUGED OR SCORED, OR IF MAGNET IS WORN UNEVENLYSUSPENSION- THE HUTCHENS 9700 SUSPENSION DOES NOT REQUIRE LUBRICATION. THESUSPENSION SHOULD BE INSPECTED FOR WEAR PERIODICALLY AND ANYWORN PARTS SHOULD BE REPLACED IMMEDIATELY.TOW RING- INSPECT FOR TIGHTNESS DAILY BEFORE USE. RING PLATE MUST BE TIGHTAGAINST NOSE PLATE TO PREVENT NOSE PLATE DEFORMATION. RING SHOULDBE INSPECTED DAILY AND REPLACED IF RING SHOWS EXCESSIVE WEAR.TO INSTALL RING ON TRAILER DETERMINE PROPER HEIGHT ACCORDING TOTHE TOW VEHICLE WHICH WILL BE USED. INSTALL TOW RING WITH BOLTIN THE LOWER POSITION WHENEVER POSSIBLE. TIGHTEN NUTS ON BOLT ANDSTUD UNTIL BOTH LOCK WASHER ARE FULLY COMPRESSED. DO NOT USE WITHA TOW HITCH THAT IS EXCESSIVELY LOOSE OR ONE THAT BINDS WHEN TURNING.LIGHTS- CHECK PLUG FOR CONDITION AND TIGHTNESS OF TERMINALS. INSPECT ALLLIGHTS FOR PROPER OPERATION DAILY AND REPLACE BULBS AS NEEDED.JACK(S)- CHECK JACK DAILY FOR ANY PHYSICAL DAMAGE OR LACK OF OPERATIONDUE TO RUST OR CORROSION. REPLACE IF SEVERELY RUSTED OR DAMAGED.CHECK MOUNTING BOLTS FOR TIGHTNESS AND BE SURE LOCKING HARDWAREIS USED.SPECIAL NOTEON PAINT- IN AREAS WHERE DE-ICING CHEMICALS ARE USED BE SURE TO WASH TRAILERREGULARLY DURING WINTER MONTHS TO PREVENT DAMAGE FROM CORROSIVEDE-ICING AGENTS. INTERSTATE TRAILERS INC. WILL NOT HONOR PAINTWARRANTY CLAIMS IF DAMAGE IS DETERMINED TO BE CAUSED BY PROLONGEDCONTACT WITH DE-ICING AGENTS.*WARNINGS**WARNING*- BE SURE TRAILER IS CONNECTED TO TOW VEHICLE WHEN LOADING ANDUNLOADING MACHINERY. LOCK TRUCK BRAKES BEFORE LOADING ANDUNLOADING*WARNING*- CHECK TIRE INFLATION DAILY*WARNING*- CHECK WHEEL LUGS WEEKLY*WARNING*- USE CAUTION WHEN RAISING OR LOWERING REAR RAMPS.DO NOT PLACE HANDS OR FEET UNDER RAMPS WHEN RAISING OR LOWERING!*WARNING*- TRAILER SHOULD BE LEVEL WHEN FULLY LOADED. ADJUST HITCH TO MAKETRAILER LEVEL WHEN LOADED.
Interstate Trailers Inc. 1101 Heritage parkway Mansfield, TX 76063 1-800-433-5384 phone 817-453-2672 parts department fax www.interstatetrailers.com web address Thank you! The Interstate Trailers team.
