Flo-Check
®
USB Hydraulic System Analyzer
Installation & Programming Instructions
Form No. 05-SGN-PM-00191 02/12
Page 23
4. Select Run and/or Record on the PC (see Recording Measurements to a File on page 8).
5. Increase the load on the Flo Check tester to produce back pressure on the hydraulic motor.
WARNING
See manufacturer's speci
fi
cations for maximum allowable back pressure. If the motor does not have an external
drain, it can not have a back pressure load. Failure to follow the manufacturer's speci
fi
cations can result in injury to
personnel and/or damage to the equipment.
6. The
fl
ow at rated RPM can now be checked against the motor manufacturer’s speci
fi
cations. A decrease
in RPM and an increase of case
fl
ow with increased load indicates a loss of the motors ef
fi
ciency.
Note: If the
fl
ow and RPM meet speci
fi
cations, it could indicate a relief valve problem or DCV problem.
¹ For complete information, visit www.hedland.com and select Petroleum Fluids under Products / Variable
Area High Pressure Flow Meters.
D. Directional Control Valve (DCV) Test
1. Isolate the motor from the circuit and connect the Flo-Check’s output to the DCV’s B port.
2. Select Run and/or Record on the PC (see Recording Measurements to a File on page 8).
3. Slowly close the Flo-Check loading valve to achieve the rated pump pressure. Repeat for all operating
positions of all DCV’s.
a. If all components are in good operating condition, pressure and
fl
ow measurements should be the
same as in the Pump Test.
b. If a decrease in
fl
ow in any DCV position is noted, leakage is indicated.
c. If the decrease in
fl
ow is the same with the control valve in all positions, it indicates the relief valve
is at fault. (Note: This can also indicate some other leak is present in the control valve such as a
defective casting, damaged seals, or worn valve position detents – but always check the relief valve
FIRST.)
d. If
the
fl
ow readings are now higher and comparable to the other control valves, then a faulty cylinder
or motor is indicated.
IV. Bi-directional Cylinder Test
This setup allows you to calculate extension times and verify force.
Flo-Check
FIGURE 10 -
Bi-directional Cylinder Test
1. Install the Flo-Check on the rod or cap side of the cylinders.
