Farr KT5500 - Recommended Periodic Checks; Overhaul Procedures

KT5500 5-
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” Tong & CLInCHER® BaCKup
SECTIon ConTEnTS
3.9
TECHnICaL ManuaL
MaInTEnanCE
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/
backupassemblyontotheconstructedsupportuntilallweightisremovedfromfrontlegsuspensionsprings.
2. Disconnectallhydrauliclinesfromthebackup.
3. Removethenylocknutandboltsetsfromthebottomofthefrontlegs,andslidethelowerspringcapsandfrontlegcoilsprings
offeachleg.Notethatthetopspringcapswillremainwithinthebackupbodyassembly.
4. Disconnectthetworearbackupsupportspringsconnectingthebackuptotherearleg(notapplicableforlow-profilecompres-
sion-stylebackup).
5. Removetheloadcellassembly.
6. Lifttongandlegsupandawayfromthebackup,andsettongontoaflatworksurfacethatwillsupporttheweightofthetong,
andallowaccesstothebottomplate-ensurethatthelegsdonothaveanyweightonthem.
REMOVAL OF LEG ASSEMBLIES.
7. Removetherearlegassemblybyremovingtwo1-1/4”x8”hexboltandnutsetsandtwo7/8”x9”hexboltandnutsets.
8. Removethefrontlegassembliesbyremovingthe1/2”x3-3/4”boltsandnutsetoneachleg,andslidelegtubesoutofleg
mountweldments.
REMOVAL OF TOP PLATE
9. Removetherigidslingassemblybydisconnectingthelevelingdevicesfromthehangerbrackets.
10. Removethetworigidslinghangerbrackets.
11. Disconnectthe three hydraulic connections fromthe motor.Undo the restraints securing theinlet andoutlet lines from their
supports,andliftthehydraulicvalvesectionawayfromthetong.Removetheinletandoutletsupportpieces.
12. Removetopbrakebandassembly(leaveadjustmentlugweldmentsinplacefornow).
13. Removethetongdoorstopcylinder.
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prop-
erly, and toholdthedoor intheopenposition when opened.Doorstopspring fatiguewillresultin sluggish latchoperation.
Replacethelatchspringinsidethecylinderwhenthisoccurs.
2. 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
eitherpinisbent.
3. Shifting Shaft
Theshiftingyokeissecuredtotheshiftingshaftbyalocknutonthebottomoftheyoke.Checklockingnutsaftereachjob.Do
thisbyremovingtheclutchinspectionplateandensuringasnugfitpriortolubrication.
4. Torque Gauge Assembly
Periodiccalibrationofthetorquegaugeisrecommendedtoassureaccuratetorquereadings.Whenhavingthetorquegauge
servicedandcalibrated,itiscriticaltonotethearmlengthofthetong,asindicatedinthe“Specifications”section.Farrrecom-
mendsthat the torquegauge assembly be calibrated yearly. Periodically check to ensurethe load cellis filled with oil (see
Section6).
G. OVERHAUL PROCEDURES
Thetongmaybeoverhauledfollowingthedisassemblyinstructionsinthefollowingprocedure.Accesstothegeartrainispossible
byremoving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.