Napa 791-6425A Operating Manual - Solutions
791-6425A
4
01/11/07
oPerATing MAnuAl & PArTS liST for 791-6425A
oPerATing MAnuAl & PArTS liST for 791-6425A
POSSIBLE PROBLEMS AND SOLutIONS
SOLutIONS
Thereleasevalveisnotclosed.
Turnthevalveclockwisetightly.
Lowonoil.Refillthejacktothecorrectlevelofoil.
Pumpsealsandback-upringisdefective.Cleanoilpassages,replace
sealsandrenewoil.(Mustbeservicedbyqualifiedservicecenter)
Thehydraulicsystemisfilledwithair.Openthereleasevalve,
pumphandlerapidly(4)fullstrokestopurgeair,closereleasevalve.
Returnspringisbrokenorlinkagesbinding.
Replacespringifbroken.Greasepivotshaft,oilallliftarmlinkages.
Dischargeballisnotsealinghydraulicsystemandoilmaybedirty.
Manuallyflushhydraulicsystembyraisingandloweringliftarmby
hand.Openthereleasevalve,asrequiredtoraiseandlowerthelift
arm.Manuallyraiseandlowerliftarm.
Jack
will
not
lift
load
Jack
will
not
hold
load
or
handle
rises
Jack
will
not
lift
to
its
full
height
Jack
will
not
lower
completelyJack
will
not
lift
smoothly
or
jack
feels
spongy