Farr HD8625 - Page 70

3.28
hD8625 8-
5
/
8
” 35K Tong
Technical Manual
MainTenance
DePressurIzatIon ProCeDure for storage:
1) Rotatethetongtothe“openthroat”position.
2) Exercise each hydraulic cylinder several times - open the tong and backup doors (if equipped), retract and extend the
remotebackingpinramp(ifequipped),retractandextendthefloatcylinders.Leaveallcylindersexceptforthedoorcylin-
dersintheirfullyretractedposition.Thegeneralideaistohaveaslittleofthechromecylinderrodsexposedaspossible.
3) De-energizethepowerunit.
4) Repeatedlyactuatethe tongmotorcontrolvalve leverINBOTHDIRECTIONStodissipateanyresidualpressure inthe
valveandmotor.
5) RemovethehydraulicSUPPLYlinefromtheequipment.
6) Repeatedlyactuatethe remainingcontrolvalvelevers INBOTHDIRECTIONSto dissipateanyresidualpressure inthe
remainderofthehydrauliccontrolsystem.
7) Connectalow-pressureairsupplyline(10PSIorless)tothehydraulicsupplyline,andforceasmallamountoftheremain-
inghydraulicfluidfromthevalveassembly-thiswillallowforthermalexpansionofthehydraulicfluidiftheequipmentis
storedortransportedinhighambient temperatures. Failure to dothismayresultindamagedordestroyedseals in the
equipment.
8) DisconnectthehydraulicRETURNlinefromtheequipment.
9) Disconnectremaininghosessuchascasedrains,orlinesconnectedtotheturnscounter.
11.
Energizepowerunit.
12.
Rotatetongforoneminute,stop,andreversethedirectionofrotationforanotherminute,endingwiththeopeningofthe
rotarygearfacingthegeartrain.De-energizethepowerunit,andperformanothergenerouslubricationofthegeartrain,
includingthegearhousing.
13.
Energizepowerunit.Rotatetongforoneminute,stop,andreversethedirectionofrotationforanotherminute,endingwith
theopeningoftherotarygearfacingthegeartrain.
14.
De-energizethepowerunit,andperformathirdgenerouslubricationofthegeartrain,includingthegearhousing.
15.
Energizepowerunit,androtatethetongforafinaltime,oneminuteinonedirection,stop,andreversethedirectionofrota-
tionforanotherminute,thistimeendingwiththerotarygearinthe“openthroat”position.
16.
Extendallhydrauliccylinders,andinspectcylinderrodsforsignsofmechanicaldamage,flaking,orrust.Farrrecommends
thatdamagedcylindersbereplacedpriortostorage.
17.
Ifyouareusingaframe-mountedtool,thetongmustbeloweredontothebackupinordertoremovetheriskofsuddenand
catastrophicmovementwhenpressureisremovedfromthefloatcylinders.Coverthetopofthebackupwithprotectivecloth
toprotectthepaintonthebackup.Placetwowoodenbeamsacrossthetopofthetong,ensuringthatthebeamshavea
minimumsizeof4”x4”xthewidthofthetong.Coverthetopsofthewoodenbeamswithmoreprotectiveclothtoprevent
paintdamagetothetong.Whenloweringthetongontothebeams,ensurethatthebeamscomeintoflatcontactwiththe
bottomofthetong,awayfrombearingcaps,brakebands,orotherprotrusionsonthebottomofthetong.Ensurethatthe
tonghangerchainsareloose,butnotdanglingintocontactwiththehangersortopplateofthetong.
18.
Ifanyhydraulicfittingsorhosesareleakingtheymustberepairedorreplacedbeforeproceeding.
19.
Wipeallexcessgreasefromoutsideofequipment.Replacetheaccessdoorpanel.Useasolvent-basedcleaneronragsto
wipeallexternalsurfacestoremoveresidualgreaseorhydraulicfluid.Oncetheoutsidesurfaceshavebeende-greased,
wipeallexternalsurfaceswithcleanwatertoremoveresidualsolvent.
20.
Farrrecommendsthatchainslingsberemovedandstoredseparately.Rigidslingsandotherrigidsuspensiondevicesmay
remaininplace.
21.
Applygreaseorheavyoiltoallexposedcylinderrods.
22.
Farrrecommendsthatananti-corrosiveagentsuchasTectyl
®
506beappliedtoallexternalsurfacesEXCEPTcylinderrods
(includingchainslings).Refertomanufacturerdatasheetsforproperapplicationandsafetyinformation.
DO NOT ALLOW ANTI-CORROSIVE AGENTS TO CONTACT CYLINDER RODS. CYLINDER ROD
DAMAGE WILL OCCUR.