Simba X-Press - To Adjust the System Pressure

X-Press
Operating Instructions
34
5.7 To Adjust the System
Pressure
A low oil ow should be used,
i.e., tractor tickover or low ow
selected.
Thewingcircuitiscontrolledbyan
overcentrevalvecontainedwithin
themanifoldblockwhichpositively
locksoilowuntilpressurisedby
thetractor.Systempressurecan
be retained in the circuit even
after depressurisation of the
tractorquickreleasecouplings.
Exercise extreme care when
checking the valve or circuits,
and under no circumstances
attempttoadjustorloosenttings
without prior reference to your
authorised simba dealer, and
detailedmaintenanceinstructions.
Itisnormaltooperateat10-20bar.Thiscan
beincreasedto40-50barmax,orreduced
to 5 bar as conditions determine.  Higher
pressurewillcausethewingtipstodigin
causingthecentreofthemachinetoliftit
out.Toolittlepressurewillcausethewing
tipstoliftout&thecentreofthemachine
todigin.Whentowinganotherimplement
behindtheX-Press,thepressuremayneed
increasingtocompensate.
Inallcasesthenormaladjustmentmethod
is to minimise system pressure and then
increase by adjusting the pressure valve
untilthedesiredpressureisachieved.
In all cases, regardless of tractor make,
adjustmentshouldstartfromzero(minimum
pressure) and gradually increase up to
desiredpressurevalue.
Withthemachineofftheground,
1. Pressurisethewingstounfold.Asthe
unfoldingbeginsthepressurereading
on the gauge will drop. When the
wingshavefullyunfoldedthepressure
reading will start to climb. Keep
pressurisingthewingsuntilthegauge
hasstabilisedatthepre-setpressure.
Thestandardfactorysettingis15bar.
2. Ifthesystemneedsadjusting:-Partially
fold the wings & hold them in this
position.Toadjustthepressureutilise
valve3(shown in Fig. 5.03).Unscrew
theadjustingscrewuntilnoresistance
can be felt (almost fully unscrewed
position). Unfold the wings fully as
before, checking the gauge reading.
Maintainhydraulicpressureunfolding
wings & adjust the screw whilst
pressurising.
• Turningadjusterclockwiseincreases
pressure.
• Turning adjuster anti-clockwise
decreasespressure.
Oncethedesiredpressureisachievedlock
thevalve.Asacheck,partiallyfoldthewings,
stop, and then unfold again maintaining
pressureuntilthegaugestabilisesatyour
desiredsetting.
Fig. 5.03: Manifold Block
5.ServicingandMaintenance