Farr HD8625 - Page 77

Technical Manual
hD8625 8-
5
/
8
” 35K Tong
4.3
TroubleshooTing
PROCEDURE:
a. Isolateyourtongfromhydraulicpower,anddepressurizefollowingtheprocedureinsection3.D
b. Loosenthelockingnutonthepressurereliefvalve.
c. Usealargeflat-headscrewdrivertocompletelyun-threadthepoppetandspringfromthereliefassembly.
d. Inspectthereliefvalvespring,poppet,andvalveseat.
e. Ifnodebrisisfoundinreliefvalveandifseatandpoppetareundamaged,replacereliefvalvespring.
f. Reassemblereliefvalve.
g. Reliefvalvemustbere-settoallowmaximumsystempressure.FollowtheprocedureinStep1ofthissectiontoproperlyadjustrelief
valve.
h. Ifmaximumsystempressurestillcannotbereached,replacetheentirereliefvalveassembly.
POSSIBLE PROBLEM SOLUTION(S)
2
Reliefcannotbeadjustedtomaximumsystempres-
sure(highfluidbypassresultsinlowsystempressure
Debrisonvalveseat
Valvespringisbroken
Valvespringhaslostspringforceduetocontinuoustension
RELIEF VALVE IS INCORRECTLY SET OR NOT FUNCTIONING Cont’d: