Stanley Black & Decker MBX138 Automobile Parts User Manual


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32 ► MAXFORCE BREAKER User Manual
FLOW TEST PROCEDURES
Thecorrectperformanceofthisprocedurewillverifyif
theauxiliarycircuitofthecarrierisadequatetoproperly
operateaStanleyattachment.
This procedureis genericin form.It isthe end users
responsibilitytoensurethatthisprocedurewillworkwith
hisspecictypeofequipment.
Ifanadequateowmeterisnotavailablecontactyour
StanleyHydraulicDistributorforassistance.
TEST PROCEDURE
1. Withtheauxiliarycircuit(orkit)completelyinstalled
connecttheowmeterbetweenthe toolinletand
outlet hoses.
NOTE:
Always use the hoses that are supplied for the at-
tachment and make sure the machine hydraulic
oil is between 90 to 120 °F. This will assure correct
readings and adjustments.
2. Withthemachinesettingatthemodethat’sgoingto
beusedtooperatetheattachmentrecordtheGPM
_____.
Locate the correct ow for the attachment in the
manualunderthe specicationsection.Adjustthe
machinetothecorrectGPM.
NOTE:
If possible, always set the machine to the highest
GPM output mode. This will prevent the operator
from over owing the attachments.
3. OncethecorrectGPMowisachievedfullyopen
therestrictorontheowmeter.
4. With the machine in the attachment mode set in
step 2record theback-pressure.At thispoint the
pressurereadingonthepressuregaugeistheback-
pressureinthecircuit.Thispressuremustnotex-
ceed200psi/13.5bar.
Excessiveback-pressurewillslowtheattachments
operationand leadtoprematureseal failuresand
overheating.
Record the back-pressure psi.
5. Closetherestrictorvalveontheowmeteruntilthe
attachmentreliefstartstocrackoropen.Therelief
valveopenswhentheowrate(GPM),indicatedon
theowmeterbeginstodeclinerapidly.Locatethe
toolsoperatingsystemreliefpressureinthespeci-
cationsectioninthemanual.Adjustattachmentre-
lieftospecication.
NOTE:
The relief valve pressure must be greater than the
operating pressure of the attachment and three
times the back-pressure. Never use the relief valve
to control the ow rate in the circuit. Cracking pres-
sure means the loss of 4 or more GPM.
Record the relief cracking pressure psi.
Example:
Operationpressureofabreakeris2700psi.Back-pres-
sureis150psi.Agoodruletofollowwhensettingthe
relief,multiplythebackpressureby3thenaddthisnum-
bertotheoperationpressureoftheattachment.
OperatingPressure 2700psi
Back-pressure 450psi
Operatingpressureofthetool 3150psi
Thereliefvalvesettingmustbegreaterthantheestimat-
edoperatingpressureofthetool.Ifthesettingislower,
damage tothe circuitmay occur.Excess heatwill be
generated in the circuit which will damage the attach-
ment and carrier.
HEAT LOAD TEST
Withtheinstallationkitproperlyinstalledandadjusted
pertheaboveprocedure,conducttheheatloadtestas
follows.
1. Connecttheowmeterbetweenthetoolinletand
outlet hoses.
2. With the carrier set in the attachment mode, re-
strict the ow meter until a pressure of 1000 psi
is achieved. This pressure must be maintained
throughout the heat test.
NOTE:
Closing of the restrictor may be required as the tem-
perature increases.
Monitor the oil temperature from the ow meter until
nochangeisnoted.Recordthetimerequiredforoilto
stabilize. Record the surrounding temperature (ambi-
enttemperature).Recordthetimerequiredtostabilize
minutes.
Record the stabilized oil temperature °F.
Record the ambient temperature °F.
The“heatrise”iscalculatedasthestabilizedtempera-
tureminustheambienttemperature.
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