Hi-Vac X-Vac Hydro Excavator X15 Series Guide

A Product of Hi-Vac Corporation
X15-SERIES
A Product of Hi-Vac Corporaon • 117 Industry Road • Mariea, Ohio 45750 USA
Corporate: Tel: [phone] • Toll Free USA: 800.752.2400 • Fax: [phone]
Web: www.x-vac.com • E-mail: [e-mail]
OPERATION
M A N U A L
SERVICE
& PARTS

PRE-DELIVERY INSPECTION FORM
CUSTOMER TRAINING FORM/DELIVERY CHECKLIST
MESSAGE TO NEW OWNER
WARNINGS
I. PRINCIPLES OF OPERATION
 PosiveDisplacementExhausterandWaterPumpUnits
 ControlsandGauges
 PowerDeckSystemsEngagement
 UnitPower
PTO
 EngagingtheExhauster
 LowWaterWarningandColdWeatherCondions
 Hydraulics
 DashboardandControlpanelControls
 SideOperator’sStaon
 AirPurgePumpPrimeColdWeatherBlowoutSystem
 ColdWeatherRecirculaon
 WirelessRemote
 BoomUpSafetyAlarm
 TankUpSafetyAlarmOpon
 LowWaterWarning
 VacuumBreaker
 DebrisProbeOpon
 HydraulicBack-UpSystemOpon
 CompartmentHeater
 WaterHeaterOpon
II. HOW TO USE YOUR HYDRO EXCAVATOR UNIT
 ImportantSafeguards
 BeforeGoingtotheWork-Site
 HydroExcavangattheWork-Site
 VacuumingattheWork-Site
 LeavingtheWork-Site
 DumpingtheDebrisTank
 CleaningtheDebrisTank
III. HELPFUL HINTS FOR USING YOUR HYDROEXCAVATION UNIT
 WaterLevelIndicators
 ColdWeatherStorage
TABLE OF CONTENTS
SECTION 1 OPERATIONS
A Product of Hi-Vac Corporation
OPERATIONS, SERVICE AND PARTS MANUAL

A Product of Hi-Vac Corporation
OPERATIONS, SERVICE AND PARTS MANUAL
Note: Someofthepartsinformaoncontainedinthismanualhasbeenprovidedbytheoriginal
 partsmanufacturerandshouldonlybeusedasavisualreferencewhenordering.Foran
 accuratelisngofpartnumbersandcomponentsonaccessories,pleaserefertothe 
 OponalEquipmentseconofthismanual.
I. PARTS
SparePartsList
II. CONTROLS
 SideOperator’sPanel       
 PendantControlAssembly(Oponal)
 ElectricalRelatedBullens
 WirelessRemoteControl
 VendorManuals
III. POWER TRAIN
PTO
 PTORemoteFill
 BlowerDriveSystem          
 VendorManuals
1. CUSTOMER SERVICE AND PARTS ORDERS
2. SALES TERMS
3. CLAIMS PROCEDURE
4. REPLACEMENT PART WARRANTY
5. LIMITIED WARRANTY
6. GENERAL MAINTENANCE SCHEDULE
7. TROUBLESHOOTINGCOMMONPROBLEMS
8. TORQUESPECIFICATIONS
9. X-VACLUBRICATIONPOINTS&INTERVALS
10. X-VACUNITWATERPUMP,EXHAUSTER,PTO,ANDHYDRAULICSYSTEMLUBRICATION 
INTERVALS
11. FILTER REPLACEMENT SCHEDULES
12. BOOMHOSEMAINTENANCE
SECTION 2 SERVICE
SECTION 3 PARTS

A Product of Hi-Vac Corporation
OPERATIONS, SERVICE AND PARTS MANUAL
III. WATER SYSTEM
WaterPumpDriveSystem          
WaterPumpArea           
WaterHeater
PumpPrimingKit
UnloaderValve
Y-Strainer
Guns/Lances/Nozzles
WaterSystemSchemac          
VendorManuals
IV. VACUUM SYSTEM
BlowerandSilencers
FinalFilterAssembly
VacuumBreaker
VendorManuals
V. HYDRAULIC SYSTEM
HydraulicTank&HeatExchanger         
HydraulicPumps/Motor         
RearDoorCylinder           
RearDoorLocks
HydrailicValves
BoomHydraulicMotor
BoomControlValveAssembly
HydraulicFilters   
HydraulicVibrator          
HydraulicSchemac(s)          
VendorManuals
VI. ELECTRICAL SYSTEM
Electricalschemac(s)         
VIII. BODY
AirPortal
CycloneInstallaon          
CompartmentHeater
GroundCable
PolytankInstallaonInstrucons
PolytankRepairandRepairItems         
SECTION 3 PARTS (Connued)

A Product of Hi-Vac Corporation
OPERATIONS, SERVICE AND PARTS MANUAL
IX. OPTIONAL EQUIPMENT
AsShown
NOTE: The descripons and instrucons in this manual cover the standard design of the
equipment and any common deviaons when possible. This manual does not cover all
design details and variaons nor does it provide for every possible conngency which may
be encountered. When informaon cannot be found in this manual, contact your nearest
AQUATECH Parts and Service Center.
*When ordering parts always specify unit serial number.
SECTION 3 PARTS (Connued)

New Machine Pre-Delivery Inspection Checklist
Hi-Vac Pre-Delivery Form - March 2019
Y N C NA Y N C NA
Return completed form to Hi-Vac Warranty Coordinator -
[e-mail]
All options/accessories operate correctly
Comments
PTO oil level is correct
Debris tank raises and lowers properly
Water pressure is correct
All options/accessories are correct
Inspect hydro-exacavating/wash-down reels
Test speed control on sewer hose reel pay in/out
Debris Body & Enclosure
Inspect rear door seal
Inspect & test enclosure heaters
Inspect & test water heater
Vacuum tubes are correct type and sizes
Inspect sewer hose and hydro-exacavation hoses
Decant valve works properly
Check toolboxes/enclosure for packaged accessories
Accessories/Other
Hose Reel
Inspect water tanks for damage
Inspect drive chain tension on sewer hose reel
Hose reel swings and pays in and out correctly
Hydraulic System
Hydraulic oil level is correct
Check cylinders, hoses, valves for oil leaks
Boom functions properly
Rear door opens and closes and door locks function
Test throttle control at control panels
Test wireless remote controls
Test all lights, strobes, arrow boards, etc.
Engage PTO into work mode
Engage water pump
Engage blower
Inspect control panels for loose wires/connectors
Engine oil and coolant levels are correct
Inspect drive lines, tighten bolts if necessary
Tire pressure is correct
General condition/appearance of chassis
Electrical System
Engine & Chassis
Dealer Name
Dealer Location
Inspected By
Customer NameInspection Date
Y=Passed N=Failed C=Corrected NA=Not Applicable Y=Passed N=Failed C=Corrected NA=Not Applicable
General
Operation Manual (paper & electronic) with unit
Unit conforms with customer specs
Water System
Install Y-Strainer and cap on suction line
Fill water tanks and check for any leaks
Water pump operates correctly
Check each item below. Refer to Owners' Manual for specific information regarding safety, operation, and maintenance of the unit. Indicate in the appropriate space as
each item has been performed. If the item is found to be not accetpable, describe each discrepancy in the comments space at the bottom of the form. Immediate action
must be taken to correct all discrepancies. The machine is not to be placed into service until all discrepancies have been corrected.
Machine Model
Machine Serial Number
Hour Meter Reading

III
OPERATIONS, SERVICE AND PARTS MANUAL
A Product of Hi-Vac Corporation
CUSTOMER TRAINING FORM/DELIVERLY CHECKLIST (Page 1 of 2)
Operator and Service Personnel must be thoroughly instucted of the following:
(Please initial on lines provided)
Power Take off (PTO)
•Maximumoperatingspeed _____________
• Howtoengageanddisengage _____________
 • Drivetrainserviceandlubrication _____________
 • Hydraulicpumplocationandalignment _____________
 • PTOoillevel _____________
Hydraulic system
 • Oillevelinspectionandtimeinterval _____________
 • Locationoffiltersandservice _____________
 • Manualover-rideoperations _____________
 • Locationofflowcontrolvalvesandexplanationofadjustments _____________
 • Locationofhydraulicpressuregauge _____________
 • Boomsystemoperation _____________
Pneumatic system
 • Airreservoirregulator,filterandservice _____________
 • OperationofPTO _____________
Water system
•Watertankinspectionandrepair _____________
• Drainvalves _____________
 • Waterpumpdrivesystem _____________
 • Oillevelinspection,timeinterval _____________
 • Packinglubrication,timeinterval _____________
 • Water“on/off”controls _____________
 • Pressurereliefvalveandoperation _____________
 • Returnlineballvalvesettingandservice _____________
 • Handgunoperation _____________
 • Winterrecirculation _____________
 • Coldweatherstorage _____________
 • Waterpressureoperation _____________
 • Removaloficefromsystem _____________
 • Suctionlinestrainer _____________
 • Waterpumpserviceoillevel _____________

IV
OPERATIONS, SERVICE AND PARTS MANUAL
A Product of Hi-Vac Corporation
CUSTOMER TRAINING FORM/DELIVERLY CHECKLIST (Page 2 of 2)
Operator and Service Personnel must be thoroughly instucted of the following:
(Please initial on lines provided)
Vacuum system and debris tank
 • Debristankinspection _____________
 • Doorgasketcleaning _____________
 • Exhausterlubricationoillevel _____________
 • Primarysafetycut-offoperation,service _____________
 • Vacuumgauge _____________
 • Vacuumbreaker _____________
 • Exhausterdrivesystemandcontrols _____________
 • Centrifugalscrubberandcleanoutscreen _____________
 • Reardooroperationandcontrols _____________
 • Tanktippingoperation,controls,lubrication _____________
 • Tankprop _____________
 • Hydraulicdoorlocks _____________
 • Withseparatoropen-explaincleaningandun-clogging _____________
 • Withfinalfilterdooropen-explainfinalfiltercleaning _____________
 • Waterdrainingsystem _____________
 • Coldweatheroperation _____________
 • Storage-drainingallwaterfromsystems _____________
Accessories supplied with unit
 • Handgunassembly _____________
Options
 • Waterheater _____________
 • Equipmentcompartmentheater _____________
 • Antifreezesystem _____________
THIS INSPECTION WAS PERFORMED BY:
Unit Serial Number:
Signature:
Title:
Date:

V
A Product of Hi-Vac Corporation
OPERATIONS, SERVICE AND PARTS MANUAL
INTRODUCTION
MESSAGE TO NEW OWNER
ThankyouforpurchasingyourX-VACHydroExcavatorunit,themostadvancedAmerican-made
hydroexcavaonmachine.Ourqualityofdesignandmanufacturewillassureyouthegreatestreturn
onyourequipmentinvestment.
Pleaseconsultthisowner’smanualastherststeptoresolvingquesonsyoumayhaveaboutthe
operaonorserviceofyourmachine.Ifyouarenotabletondtheanswers,thenconsultwithyour
sellingdealer.Finally,weatthefactorywillbehappytoprovideoperangorserviceinformaonthat
thismanualoryourdealerareunabletoprovide.
Ourwarrantyspellsoutallyourrightsandexpectaonswithregardtothisequipment.Please
consultitforafulldenionofwhatiscovered.
Thank you again for selecng the equipment preferred by industry professionals throughout the
world.
YournewX-VACHydroExcavatorunitincorporatestheverylatestinhydroexcavaontechnology.
Thesoilcungaconresultsfromwatertravelingfromthestoragetankintothehigheciency
waterpumpandbeingpumpedtothehosereelandnozzleathighpressureandlowvolume.Asa
result,themachinewillexcavateandoperateinafarsuperiormannerthanpreviouslyavailable.
Thevacuumsystemprovidedissuperiortoanyotheravailable.Itiscapableofbothwetanddry
operaon,aswellasoperaonunderwater.
Toachievemaximumresults,theoperatorsmustbecomethoroughlyfamiliarwiththeoperaonof
themachineandcompletelyunderstandcorrectnozzleseleconandcleaningaccessoryuse.
Weareacompanythatiscommiedtoconnuallystrivingtobuildanevenbeerproduct.Many
ideasforimprovementsinpreviousmodelshavecomefromusersintheeld.

VI
A Product of Hi-Vac Corporation
OPERATIONS, SERVICE AND PARTS MANUAL
WARNINGS
X-VAC HYDRO EXCAVATOR MACHINES
X-VACHydroExcavatormachinesaredesignedtoremovematerialinanundergroundenvironment.
Thesesystemsoperateunderhighpressurecondionswithlowwaterow.Therefore,operatorsof
thesesystemsmustbeawareofpossiblehazards.Thisisnotacompletelistofallpossiblehazards,
butrepresentstypicalhazardsandtypesofhazards.Atallmes,theoperatorisresponsibleforthe
properuseofthemachine.
Operators of X-VAC Hydro Excavator machines should be aware of the following safety
warnings:
•Usingthismachineforpurposesotherthanhydroexcavaonisnotrecommended.
•Waterhosethatisdamagedintothebraidedliningmustberepairedorreplaced.
•Fingsusedonwaterhosemustbeofatypeandinstalledinamannerthatisapprovedby 
thehosemanufacturer.
•Thehandgunisdesignedtoshutoautomacallywhentheactuatorhandleisreleased. 
Neveruseaforwardjetnozzlethatwillnotturnowhenreleased.
• Thehandgunremainspressurizedaeruse.Aershungowatersupply,squeezeactuator
handletorelievepressurebeforestoringorbeforedisconnecngthehandgunfromhose.
•Neveroperatethewatersystemwiththereliefvalvesremoved,orimproperlyadjusted 
Themainreliefvalveissetat3500psi.Donotoperateatpressurereadingshigherthanthese
unlessthemanualspecicallystatesthatthesystemhasbeendesignedforhigherpressures.
•Neverwalkunderraisedcomponentssuchashydraulicallyactuatedtanks,doors,etc. 
Wheneverthesecomponentsareraised,propsmustbeusedtoprotectworkerswhomust 
workunderthem.
•Neveroperatethemachineinastaonaryposionwithoutrstsengthebrakes,andshiing
therearaxleoutofthedriveline.Alwaysusewheelchocks.
•Nevermovethevehiclewiththeboominaraisedorotherwiseunsecuredposion.
•Alwaysturnounitpowerwhenmovingthevehicle.
•Alwayscheckforoverheadobstruconsbeforeoperangboom.
YOUR LIFE COULD DEPEND ON IT!!!

PRINCIPLES OF OPERATION 1
AQUATECH OPERATIONS, SERVICE AND PARTS MANUAL
A Product of Hi-Vac Corporation
PRINCIPLES OF OPERATION
POSITIVE DISPLACEMENT EXHAUSTER AND WATER PUMP UNITS
Thismachineisacombinaonvacuumandhighpressurewaterunitforexcavaonofsoil.
Thevacuumpumpisarotarylobe,posivedisplacementexhauster.Duringoperaonofthe
vacuumsystem,materialispickedupattheendofthesuconlineandpneumacallyconveyed
throughtheintaketubes,theboomhose,andtothedebristank.Asthematerialentersthelarger
areaofthedebristankthevelocityoftheairowisreducedandthematerialdropsoutoftheair
stream,selingattheboomofthetank.Thespentairowsthroughtheballcheckvalve,and
throughametalscreeninthecentrifugalscrubberexternallylocatedatthefrontofthebodyand
thoughanalscreenattheblowerinlet.Atthispointthelteredairowenterstheexhauster
andisexpelledthroughasilencer/muertotheatmosphere.
Aposivedisplacementtriplexplungerwaterpumpprovidesthewaterpressureandwaterowto
thehydroexcavaonnozzleaachedtotheendofthehandgunorlance.
Inthewatersystem,thewaterowsfromthewatertanks,mountedoutboardofthedebris
tank,throughacrossovermanifold,throughthewaterpumpfeedline,intothesuconsideof
thepump.Thepressurizedwateristhenpumpedforwardtothewatercontrolvalveandrouted,
dependingontheposionofthevalve,eithertothehosereelforhydroexcavaon,orbyreturn
linestothewatertank.Thevacuumandwatersystemcanbeusedsimultaneouslywhenexcavat-
ingsoil.Thisallowsconveyanceofushedoutmaterialsandwaterintothedebristank.
CONTROLS AND GAUGES
Itisimportantfortheoperatortofullyfamiliarizehim/herselfwiththelocaon,appearanceand
funconofthevariouscontrolsandgaugesonanynewX-VACHydroExcavator.Pleasereadthis
seconcarefully,andrefertoitwheneveranyseconofthemanualdescribesacontrolwhichyou
cannotidenfy.
Severalcontrolsaremountedinthechassiscabitself.Thesecontrolsallowtheoperatortoengageand
disengagethewaterpump,exhauster,andhydraulicsystem.Inaddion,amainpower 
indicatorlightandswitch,andalowwaterwarninglightandswitchareamongthestandardcontrolsin
thechassiscab.Thewaterpumpandexhausterareengagedanddisengagedbyelectro-pneumac
solenoidvalves.Thesesolenoidsareoperatedbyelectrictoggleswitchesinthecab.Becauseeach
manufacturerwillhaveadierentcablayout,evenamongmodelsofthesamemanufacturer,our
descriponoftheirlocaonisgeneral.Inaddionthereisaswitchthatcontrolsthe“ON/OFF”
funconofthewaterheaterandcompartmentheater.
POWER DECK SYSTEMS ENGAGEMENT
Beforeengaginganyofthepowersystemsonthisvehicle,youmustrstdeterminethatthereisat
least120psiintheairbrakesystem.Checktheairpressuregaugesonthedashboardtoconrmthis.
ThePTOisactuatedbymeansofelectro-pneumacsolenoidvalves.WhileengagingPTOsystemsusing
theswitchesdescribedinthefollowingparagraphs,thevehicletransmissionmustbeputintoneutral
andtheparkingbrakesset.Forvehicleswithstandardtransmissions,theclutchmustbedepressedas
well.
Cauon! The transmission should never be operated in a gear range greater than indicated on
either the dashboard label or unit idencaon sheet.
Failure to heed this cauon may result in severe damage to the water pump or
exhauster.
Please consult with the factory if the vehicle gear range is not specied.

PRINCIPLESOFOPERATION2
AQUATECH OPERATIONS, SERVICE AND PARTS MANUAL
A Product of Hi-Vac Corporation
PRINCIPLES OF OPERATION
UNIT POWER
Theunitpowerswitchsuppliespowertoalltheotherswitchesandmountedequipment.When
turningunito,thisswitchmustbethelastoneturnedo.Pushuptoturnontheunitpower
switchandpushdowntoturnito.Aredlightglowsinsidetheswitchtoindicatethattheunit
powerison.Withoutturningthisswitchon,nothingwillfuncon.Theunitpowerswitchshould
beturnedowhentransporngtheunitunlessusingcoldweatherrecirculaon.
PTO
Inordertokeepthetruckstaonarywhileoperangthewaterpump,exhausterorboth,therear
axlemustbedisengaged.ThiscanbedonebymovingtheswitchmarkedPTOtothe“Up”or
“On”posion.ThiswillcausethePTOtointernallyshiposionsanddisengagethereardrive
trainofthevehicle.Thisalsoengagesthehydraulicpumpsforsystemoperaonsofallhydraulic
funcons(waterpump,boom,tailgate,andtuberack).
ENGAGING THE EXHAUSTER
Thesameprocedureusingtheswitchmarked(exhauster)willallowyoutoengagethevacuum
system.Bothpowersystemscanberunsimultaneouslyifdesired.Whentheprocedurefor
engagingthedesiredsystemsiscomplete,selectthegearrangereferredtoonthedashboard
label,ortheunitidencaonseconofthismanual.Releasetheclutch.
LOW WATER WARNING AND COLD WEATHER CONDITIONS
Thelowwatercontrolisthecenterswitchonthedashboard.Onunitsequippedwiththelow
waterwarningsystem,aredlightwillglowintheswitchintheeventthatthewaterlevelis
depletedtoapre-determinedlevel.Awhitelightremainsonduringnormaloperaons.Pushing
theswitchupturnsonthe“winter”lowwaterwarning.Pushingtheswitchdownturnsonthe
“summer”lowwaterwarning.Thelowwaterswitchislabeled“winter”and“summer”.During
coldweather,32oF(0oC)orbelowfreezing,thisswitchshouldbesettothe“winter”posion.
Thiswillcausethelowwaterwarninglighttoilluminatewithmorewaterleinthewatertank.
Thisallowsmorewatertoremaininthetanktohelppreventpossiblefreezing.Duringwarm
weather,theswitchcanbesettothe“summer”posion,thisallowsmorewatertodepletefrom
thetanksbeforethelowwaterwarninglightglows.
HYDRAULICS
ThemaintowerPTOincorporatestwoaddionaloutputsfortheinstallaonofthehydraulic
pumptosupplypowertoallhydraulicfunconsandthedrivesystemonthewaterpump.These
pumpsareclosecoupledtothePTO.ThesedrivesareautomacallyengagedwheneverthePTO
switchisacvatedinordertodisengagethemaindrivetothedierenalofthevehicle.When
thePTOswitchisposionedinthe“O”posionfordrivemode,thehydraulicpumpdrivesare
disengaged.

DASHBOARD and CONTROL PANEL CONTROLS
SeveralcontrolsaremountedintheChassisCabaswellasattheSideControlPanel.These
controlsallowtheoperatortoengageanddisengagethewaterpump,exhauster,hydraulicsystem,
andavacuumbreaker.Thewaterpump,exhauster,hydraulicsystem,andvacuumbreakerare
engagedanddisengagedbyElectro-Pneumac Solenoid Valves.Thesesolenoidsareoperatedby
electrictoggleswitches.Becauseeachmanufacturerwillhaveadierentcablayout,evenamong
modelsofthesamemanufacturer,locaonsofcontrols&switcheswillvaryfromunittounit.
Electro-Pneumac Solenoid Valves
PRINCIPLESOFOPERATION3
AQUATECH OPERATIONS, SERVICE AND PARTS MANUAL
A Product of Hi-Vac Corporation
PRINCIPLES OF OPERATION

PRINCIPLES OF OPERATION 4
AQUATECH OPERATIONS, SERVICE AND PARTS MANUAL
A Product of Hi-Vac Corporation
PRINCIPLES OF OPERATION
SIDE OPERATOR’S STATION
Thereisanoperator’sstaonatthepassengersideoftheunittoallowtheoperatortocontrol
vaccuuming,pumping,andtankdumpingoperaons.Thecontrolpanelcontainsswitchesforfor
thevariousoperaonsandanemergencystopbuon(notshown).Theenginethrolecontrol
atthisstaonallowstheoperatortocontrolenginespeed,andthereforehydraulicpressure.
Operateengineat1500rpmduringtankdumpingandlockoperangfuncons.Plasclabelsat
eachswitchindicatethecorrectmanipulaonoftheswitchforthefunconitperforms.Consult
thelabelingtobesureyouareoperangthecontrolscorrectly.Ifthelabelsbecomeunreadable
orareinadvertentlyremoved,consulttheinformaonintheelectricalseconforswitch
operaon.

PRINCIPLESOFOPERATION5
AQUATECH OPERATIONS, SERVICE AND PARTS MANUAL
A Product of Hi-Vac Corporation
PRINCIPLES OF OPERATION
AIR PURGE PUMP PRIME & COLD WEATHER BLOWOUT SYSTEM
(Page 1 of 2)
AIR PURGE PUMP PRIME
Air Purge Pump Prime “Valve #1”(seenextpage)isprovidedtoassistthepurgeofairtrapped
insidethesuconseconofthewaterpump.Thereshouldbesucientheadpressurefrom
thewaterinthewatertankstoexpellanyairtrappedonthesuconsideofthepump.CloseAir
Purge Pump Prime “Valve #1” (seenextpage)whenasolidwaterstreamrunsfromtheoverow
tube.
Air Purge Pump Prime “Valve #2” (seenextpage)isprovidedtoassistthepurgeofairtrapped
insidethedischargeseconofthewaterpump.Anytrappedairactsasaspringcushionforthe
compressedwaterandcausesthewaterto“bounceback”againstthecushionofair.Thiscan
causealoudknockingnoisefromthepumpareaandseverepulsangofthesewerhose.This
iscalled“cavitaon”.Iftheairisnotexpelled,severedamagecanoccurinthepump.Openthe
valvetoallowairtrappedinsidethepumptobeexpelled.Waterwillalsobeexpelledatthe
sameme.Runthepumpatanidlespeedforseveralminutesunlallairisexpelled,thenslowly
increasepumpspeed.Asthepumpdevelopsgreaterpressure,thewaterdischargedfromthe
valvewillbecomeveryintense.Whenitisclearthatallairhasbeenexpelled,closetheAir Purge
Pump Prime “Valve #2”(seenextpage)andincreasepumpspeed.Theknockingsoundshould
disappear,andthepulsangofthehosewillbeverymild.Thisisnormalforatriplexwaterpump.
Atthispointitissafetooperatethejeng,hydroorhandgunoperaon.Thisprocedureis
usuallyonlynecessarywhenallwaterhasbeenpreviouslypurgedfromthesystem,thesucon
linestrainerhasbeenremovedforcleaning,orthepumphasbeenrunoutofwater.  
Note: Ifyouhaveconstantproblemswithcavitaon,itislikelythatairisbeingsuckedintothe
pumpsomehow,oroneormorevalvespringshavebroken.Ifyouexperiencerepeatedcavitaon,
eventhoughthepumphasnotbeenrunoutofwater,youshouldrequestaninspeconofthe
watersystemtodeterminethecause.
COLD WEATHER BLOWOUT
The Schrader Air Valve(seenextpage)locatedonthetopofthewaterpump,isusedtopurgethe
pumpandwaterpipingofanytrappedwaterandreturnittothewatersuconline.By
connecngthepurgecoiledhoseassembly(notshown)totheForced Air Disconnet (seenext
page),andtheSchrader Air Valve,airisthenintroducedatthevalveandwaterisblownback
tothewatertank.TheBlowout Valve(seenextpage)mustbeopenpriortoapplyingairtothe
Schrader Air Valve.

PRINCIPLES OF OPERATION 6
AQUATECH OPERATIONS, SERVICE AND PARTS MANUAL
A Product of Hi-Vac Corporation
PRINCIPLES OF OPERATION
AIR PURGE PUMP PRIME & COLD WEATHER BLOWOUT SYSTEM
(Page 2 of 2)
Forced Air
Disconnect
Schrader
Air Valve
Air Purge Pump Prime “Valve #2”
Air Purge Pump Prime “Valve #1”

PRINCIPLES OF OPERATION 7
AQUATECH OPERATIONS, SERVICE AND PARTS MANUAL
A Product of Hi-Vac Corporation
PRINCIPLES OF OPERATION
COLD WEATHER RECIRCULATION
Side Operator’s Area:
1. AssurehosereelhoseisinsertedintotheQucik Connect.
Truck Cab:
1.  Turnon Unit Power Switch andRecirculaon Switch inthecab.
2.  Unitcannowbedriven.Asunitmoves,thewaterpumpwillcirculatewaterthroughoutthe
  systemandbacktothetank.
Cauon! The pump systems should never be operated in a gear range greater than indicated
on the dashboard and truck labeling. Failure to heed this cauon may result in
severe damage to the water pump or exhauster. Please consult with the factory if
the vehicle gear range is not specied.
Suggeson: Alwayscarrythehandgunandnozzlesintheheatedcabofthetruckwhennotin
  usetopreventfreezing.
Note: Allunitssuppliedwithcoldweatherrecirculaonareequippedwithtwolowwaterwarning
 sensorscontrolledbythe“Winter/Summer”Switchinthecab.Incoldweathertheswitch
 shouldbeinthe“Winter”posion.Thisallowsmorewatertoremaininthetankto  
 accommodaterecirculaon.Duringwarmerweather,theswitchshouldbeinthe“Summer” 
 posion,providingmorewaterforhydroexcavaonoperaons.
Quick Connect
Hose Reel Hose
Unit Power Recirculaon

PRINCIPLES OF OPERATION 8
AQUATECH OPERATIONS, SERVICE AND PARTS MANUAL
A Product of Hi-Vac Corporation
PRINCIPLES OF OPERATION
AARCOMM WIRELESS REMOTE OPTION
For direcons on how to enable all funcons, refer to the manufacturer’s manual
located in the “Controls” secon of this manual.