Case CX490D - Air Conditioning System

6-MAINTENANCE
Airconditioningsystem
WARNING
Escapingrefrigerantmaycausefrostbite!
Alwayswearprotectivegoggleswhenhandlingrefrigerant.Ifyougetrefrigerantinyoureye,immedi-
atelyushyoureyeswithwaterfor15minutes.Seekmedicalassistanceimmediately.
Failuretocomplycouldresultindeathorseriousinjury.
W0339A
Systemchargecheck
Tocheckthechargeoftheairconditioningsystem,pro-
ceedasfollows:
1.Starttheengineandturnontheair-condition-
ingsystem.Settheenginespeedto1400–
1600RPM.
2.Opentherearleft-handdoortoaccesstheair-con-
ditioningdryer.
3.Letthesystemoperateforabout5min,thencheck
theinspectiongaugeofthedryer.
SMIL19CEX0586AA1
Refertothefollowingconditions:
A.Theuidinthegaugeisatrsttransparent,then
itquicklyturnswhitishwithfewsmallairbubbles,
andstaysinthiscondition.Thechargestatusis
correct.
B.Theuidinthegaugefeaturesatrstmanyair
bubbles,andstaysinthiscondition.Thesystem
isunderlled.CalltheCASECONSTRUCTION
dealerinordertoinspectthesystemlinesforleaks
andtorestorethecorrectchargestatus.
C.Theuidinthegaugeisatrsttransparentwith
noairbubblesappearing,andstaysinthiscondi-
tion.Thesystemisoverlled.CalltheCASECON-
STRUCTIONdealerinordertorestorethecorrect
chargestatus.
4.Cleanthelinesandtheconnectionsoftheair-con-
ditioningsystem.Cleantheradiatoroftheair-con-
ditioningsystemintheradiatorscompartment.
NOTICE:Operatetheairconditioningatleastonceevery
50hinordertokeepthecompressor'ssealslubricated.
Therecommendedpracticeistosetthecabtemperature
tothelowestlevel,tosetthecabventilationfantothemax-
imumspeedandthustoletthesystemrunfor15–20min.
SMIL13CEX2895BB2
6-84