Stanley MB556 - FLOW TEST PROCEDURES; Flow and Heat Load Testing

MB556 User Manual ◄ 23
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
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 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
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 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 relief 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
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 ow meter between the tool inlet and
outlet hoses.
2. With the carrier set in the attachment mode,
restrict 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 temperature 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 (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
geographical area plus the heat rise calculated above.
Ensure that the operating temperature range is lower
than 180° for optimum operation of the attachment.
FLOW TEST PROCEDURES