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11065435 • Rev AD • October 2011
DH and DS Motors
Assembly and Test Procedures
Testing
Testing Assembled Motor
Hydraulic Fluid Specifications
General Testing Conditions
Fluid type Mineral hydraulic oil class HM, ISO 6743/4
Viscosity range 35 ± 3 cSt
Oil cleanliness 18/13 – contamination degree, ISO 4406
With the shaft pointing toward you and the system ports facing up, the motor must turn
to the right (clockwise) when supplying pressure to the right connection port.
Rotation
With the motor disengaged and no outside load on the output shaft, slowly raise the
oil supply pressure until the motor starts. Then lower the differential pressure to the
limit shown in the table below (7 or 10 bar [102 or 145 psi]). Check that the motor is still
turning at this limit. If so the motor is good.
If the motor begins to turn below the specified pressure, the motor check is OK.
Starting Pressure
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