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Hydraulic Systems
Testing Examples
TESTER HOOK-UP NO. 1
TEST A: Flow to Motor
It is best to perform hydraulic tests at the location, where the work is being done. In this example, the
complaint may be "cutting unit running slowly". With the control valve in the run position, and the flow meter
in series, between the control valve and the motor, we can put a load on the circuit by closing the restrictor
valve, until a specified pressure is reached.
If this flow reading is low or the specified pressure cannot be reached, it is likely the motor is ok, and the
problem is the pump or valve. We would then perform a pump flow test which will be covered in HOOK up
NO. 2, shown on the following pages.
If the flow reading and working pressure is ok, we should suspect the motor is worn, or damaged. If the motor
has a case drain hose, we would need to use a different hook up which will be covered in HOOK up NO. 3,
on the following pages. If the motor does not have a case drain hose, we would use the same hook up, and
perform TEST B, detailed next.
Toro University Technical Training
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