Farr HD8625 - B. RELIEF VALVE IS INCORRECTLY SET OR NOT FUNCTIONING

4.2
hD8625 8-
5
/
8
” 35K Tong
Technical Manual
TroubleshooTing
B. RELIEF VALVE IS INCORRECTLY SET OR NOT FUNCTIONING
d. Re-establishhydraulicpowertoyourtong.Ensurethatnoequipmentfunctionsareactive.
e. Loosenthelockingnutonthepressurereliefvalve.
f. Openthetongdoortoactivatethesafetydoorsystemandinhibittongrotation.
g. Activatemotorcontrolvalve.Observethepressuredisplayedonthepressureindicator.Adjustthereliefvalveuntilthepressureindi-
catedisatthemaximumsystempressurespecifiedonthespecificationspage(maximumsystempressureisthepressureatwhich
yourtongachievesitsspecifiedtorque).
DO NOT ADJUST PRESSURE RELIEF TO A SETTING THAT ALLOWS HIGHER THAN MAXIMUM
SYSTEM PRESSURE. DOING SO CREATES A POTENTIAL FOR SERIOUS INJURY OR DEATH, AND
MAY CAUSE CATASTROPHIC EQUIPMENT FAILURE.
h. Releasethemotorcontrolvalveandtightenthelockingnutonthepressurereliefvalve.
i. Isolateyourtongfromhydraulicpower,anddepressurizefollowingtheprocedureinsection3.D.
j. Closethetongdoor,andremovethetemporarypressureindicator.Restorethesafetydoorpressuresupplylinetofactoryspecifica-
tions.Verifythatsafetydoorisoperatingcorrectly(seesection2.I.5.k).
Continued on next page
IllustratIon 4.B.1: relIef valve trouBlesHootIng - temPorary gauge InstallatIon
POSSIBLE PROBLEM SOLUTION(S)
1
Relief pressure set too low, resulting in
insufficienttongtorque
Adjustsetting(Seefollowingprocedure):
Relief pressure set too high, resulting in
crushedpipeorgeartrainfailure
a. Ifyourtongisequippedwithasystempressureindicatorproceedtostep“f”.Ifyourtongdoesnothaveasystempressureindicator,
atemporary0-3000PSIindicatormustbeinstalledonthehydraulicinlet.
b. Isolateyourtongfromhydraulicpower,anddepressurizefollowingtheprocedureinsection3.D.
c. Teeinatemporaryindicatoratthesafetydoorsupplypressureport.Ensureallhydraulicconnectionsareperformedbyaqualified
hydraulictechnician.
Connect a temporary 0 - 3000
PSI pressure indicator at this
location