Case 590ST - Page 365

8-TROUBLESHOOTING
PROBLEMPOSSIBLECAUSECORRECTION
Thecentrifugalpumpofthecooling
systemisfaulty.
Overhaulthepumpand,ifnecessary,
replaceit.
Faultytemperatureswitch.Replacethetemperatureswitch.
Radiatorpartiallyfaulty.
Eliminatepossiblescalesbywashing,
checkandrepairpossibletubeleaks.
Scalesincoolantpassage
compartmentsincylinderheads
andcrankcase.
Carefullywash.
Centrifugalpumpdrivebeltandfan
drivebelttooslack.
Checkandadjustbelttension.
Coolant(insufcientquantity).
Restorethelevelintheexpansion
tankbyaddingtheprescribeduid.
Incorrecttimingoftheengine.Checkandcorrectlytimetheengine.
Theengineoverheats.
Restrictedairlter.Cleantheassemblyand,ifnecessary,
replacethelterelement.
Partiallyobstructedordamaged
injectors.
Clean,overhaulandcorrectly
calibratetheinjectors.
Dirtaccumulationsinfuellines.Cleanthelinesandreplacethevisibly
dentedpipes;ifnecessary,cleanthe
injectionpump.
Incorrecttimingoftheinjectionpump
ontheengine.
Correctlytimetheinjectionpumpon
theengine.
Driveshaftknockscausedbyan
excessiveclearanceofoneormore
crankshaftbearingsorbigend
bearingsorexcessiveshoulder
clearance.
Rectifythedriveshaftpins,assemble
biggershoulderbearingsandrings.
Unbalanceddriveshaft.Checkthealignmentandthebalance
ofthedriveshaftand,ifnecessary,
replaceit.
Looseywheelretainingscrews.
Replacetheloosescrewsandtighten
allscrewstotheprescribedtorque+
angle.
Connectingrodaxesnotparallel.Straightentheconnectingrods,
checkthattheaxesareparalleland,
ifnecessary,replacetheconnecting
rods.
Theenginehasanomalousknocks.
Cylinderknocksduetoanomalous
wear.
Borethecylinderbarrelsand
assemblebiggercylinders.
8-3