Farr HD8625 - G. OVERHAUL PROCEDURES - DISASSEMBLY

Technical Manual
hD8625 8-
5
/
8
” 35K Tong
3.9
F. RECOMMENDED PERIODIC CHECKS
1. Door Stop Spring
Thespringinsidetheactuatorcylindermustbeofsufficientstrengthtoenablethedoorlatchmechanismtosnapclosedproperly.
Doorstopspringfatiguewillresultinsluggishlatchoperation.Replacethelatchspringinsidethecylinderwhenthisoccurs.
2. Shifting Shaft
Theshiftingyokeissecuredtotheshiftingshaftbyonehexjamnutandonelocknutonthebottomoftheyoke.Checkthesenuts
aftereachjob.Dothisbyremovingtheclutchinspectionplateandensuringasnugfitpriortolubrication.
3. Backing Pin
Performavisualinspectionofthebackingpinaftereachjob.Replacethepinifstresscracksorexcessivewearisfound,orifthe
pinappearsbent.
4. Torque Gauge Assembly
Periodiccalibrationofthetorquegaugeisrecommendedtoassureaccuratetorquereadings.Whenhavingthetorquegaugeser-
vicedandcalibrated,itiscriticaltonotethearmlengthofthetong,asindicatedonpage1.3.
G. OVERHAUL PROCEDURES - DISASSEMBLY
Oncethetonghasbeenremoved from the backup itmaybeoverhauledusingthedisassemblyinstructionsspecified in the following
procedure.Accesstothegeartrainispossiblebyremovalofthetopplateofthetong.
ALL MAINTENANCE AND OVERHAUL SHOULD BE PERFORMED FROM THE TOP. THE BOTTOM
PLATE OF THE TONG IS TYPICALLY WELDED TO THE SIDE BODY AND CANNOT BE REMOVED.
REPLACEMENT FASTENERS (BOLTS, NUTS, CAP SCREWS, MACHINE SCREWS, ETC.) USED
DURING MAINTENANCE OR OVERHAUL MUST BE GRADE 8 OR EQUIVALENT.
FASTENERS USED FOR MAINTENANCE OR OVERHAUL OF LOAD-BEARING COMPONENTS
(CHAIN SLINGS, RIGID SLINGS, LEGS) MUST BE TIGHTENED TO THE PROPER TORQUE
SEPARATION OF TONG FROM BACKUP
1. Suspendtongassemblywithcrane.Constructasupportstructurethatwillsupporttheweightofthebackup.Lowerthetongontothe
constructedsupport.
2. Supporttherigidslingwithacrane.Removetherigidslingassemblybydisconnectingthelevelingdevicesfromthehangerbrackets,
andusethecranetolifttheslingawayfromthetong.Storeinaprotectedarea.
3. Removethetworigidslinghangerbrackets.
4. Disconnectthethreehydraulicconnectionsfromthemotor.Undotherestraintssecuringtheinletandoutletlinesconnectionstotheir
supports,andliftthehydraulicvalvesectionawayfromthetong.Removetheinletandoutletsupportpieces.
5. Removetopbrakebandassembly(leaveadjustmentlugweldmentsinplacefornow).
6. Removethetongdoorstopcylinder.
7. Removedoorassemblybyremovingthedoorrollershaft.Supportdoorassemblyastherollershaftisremoved.Removethenutfrom
thetopoftherollershaft,anduseasoftalloymaterial(e.g.brassrod,etc.)tolightlytaptheshaftdownthroughthesupportroller
assemblyuntilitcomesfreeatthebottom.Usecautionthatthethreadsontheendsofthesupportrollershaftsarenotdamaged.Do
notlosethedoorshoulderbushings.
8. Removethehitchpinsecuringthetorquegaugeholdertothetorquegaugemountweldment,andremovethemount.
9. Removethefourhexsocketheadcapscrewssecuringthemotorandthetorquegaugemountweldment.Removethetorquegauge
mountweldment,thenliftthemotorupandawayfromthemotormount.Inspectthemotorgear,locatedatthebottomofthemotor
shaft,forgearclashingortoothdamage.Also,ensurethatthemotorgearissecurelyattachedtothemotorshaft.
10. Removethecotterpinandclevispinconnectingtheshifterhandletotheshiftershaft(itisnotnecessarytodisconnectthehandle
fromthepivotlugweldment).
11. Unboltthepivotlugweldmentfromthetopplate,andremovethepivotlugandhandleassembly.
12. Removethefourhexsocketheadcapscrewssecuringthemotormounttothetopplate.Usecarenottodislodgeandlosethetwo
positioningdowels.
13. Removethesnapringsecuringthedrivegeartothetopoftheclutchshaft.Carefullyremovethedrivegearfromtheclutchshaft.
MainTenance