Stanley MB156, User Manual

Page: 24 / 36

24 ► MB156 User Manual
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 specific type of equipment.
If an adequate flow meter is not available contact your
STANLEY distributor for assistance.
TEST PROCEDURE
1. With the auxiliary circuit (or kit) completely installed
connect the flow meter between the tool inlet and
outlet hoses.
Note: Always use the hoses that are supplied for the
attachment 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 flow for the attachment in the
manual under the specification 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 flowing the attachments.
3. Once the correct GPM flow is achieved fully open
the restrictor on the flow 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 exceed 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 flow meter until
the attachment relief starts to crack or open. The
relief valve opens when the flow rate (GPM)
indicated on the flow meter begins to decline rapidly.
Locate the tools operating system relief pressure
in the specification section in the manual. Adjust
attachment relief to specification.
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 flow rate in the circuit. Cracking
pressure means the loss of 4 or more GPM.
Record the relief cracking pressure
psi.
Example:
Operation pressure of a breaker is 2700 psi. Back-
pressure is 150 psi. A good rule to follow when setting
the relief, multiply the back pressure by 3 then add this
number 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
estimated 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
attachment 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 flow meter between the tool inlet and
outlet hoses.
2. With the carrier set in the attachment mode,
restrict the flow 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 temperature increases.
Monitor the oil temperature from the flow meter until
no change is noted. Record the time required for oil to
stabilize. Record the surrounding temperature (ambient
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 temperature
minus the ambient temperature.
Example:
Stabilized Temperature 160°
Ambient Temperature -80°
Heat Rise 80°
The normal operating temperature range of this circuit
will be the typical ambient temperature range for the
FLOW TEST PROCEDURES