Stanley MB656, User Manual

24 ► MB656 

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 Hydraulic 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 is to 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.

FLOW TEST PROCEDURES