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FB 430 / FB 450 / FB 500 / FB 510
Dok: 101498D-GB 2103
MEASUREMENT AND ADJUSTMENT OF HYDRAULIC OIL PRESSURE
FB450 / FB510
A clear picture of the hydraulic system´s state or an indication of the cause of malfunction is obtained by
simultaneously measuring the system pressure, the drive motor speed and vibration frequency. The soil compactor
shall be in operation and maintain normal operating temperature. Hydraulic oil temperature 50-70 ° C.
The hydraulic system’s maximum pressure is preset upon delivery. Default pressure is 200 bar and can be
measured in the starting moment when the oil in the hydraulic system is cold.
When the soil compactor has reached normal operating temperature, the pressure must be 30-50 bar lower than the
system’s maximum pressure.
The pressure increases proportionally with increasing load, eg if the soil compactor is run at low speed or even
standing still during operation. When maximum pressure is reached, vibration speed is reduced.
Measurement of drive motor speed and vibration frequency is performed with a strobe with graduated scale. The
hydraulic pressure is measured with a pressure gauge with connection for gauge ports on the valve block, see
picture. The hydraulic pressure for the conversion should be between 20-22 bar and is measured with a pressure
gauge with connection for gauge ports on the distribution block, see picture. Strobe light and gauge can be ordered
at SWEPAC.
Engine speed ...........................................................................3000 rpm loaded Yanmar / 2900 rpm loaded Hatz
Vibration frequency at hydraulic oil temp. ca. 50 ° C ........... 70-72 Hz; 4200-4320 rpm
Normal running pressure hydraulic oil temp. ca. 50 ° C ....... 150-170 bar
Measuring point, hydraulic system
Measuring point, conversion
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