Vaderstad Rapid RDA 400S Original Instructions Manual page 116

Troubleshooting
Leakage from the shaft seal on
the fan's hydraulic motor!
The Control Station generates a
seed box drive alarm!
In case of a defective sensor:
116
- Leakage from the shaft seal of the hydraulic motor
may be caused by:
- Damage caused during assembly.
- Wear due to dirt.
- Wear due to too high pressure in the drain line.
- A damaged seal caused by very high pressure in the
drain line.
The pressure in the drain line can be measured on the
connector block when the plug (on the connector
marked M) is replaced by a manometer adapter. Use
a 0-10 bar manometer. The operating pressure should
not exceed 2 bars
- A high pressure may be caused by:
- Excessive oil flow in the drain line
- Counter-pressure in the hydraulic valve on the tractor.
Loosen the drain hose from the tractor and remove the
quick connector. Start the fan. Collect the drained oil
in a container.
Measure the pressure. Measure the amount of oil ex-
iting during one full minute.
A considerable pressure drop would indicate a prob-
lem with the tractor's hydraulic valve.
A small pressure drop would indicate an excessive
flow of oil. Usually the flow in the drain line should
be less than 3 l/min.
- Excessive oil flow may be caused by:
- A worn motor
- A leaking non-return valve on the connector block.
Oil from the return line will then leak into the drain
line.
Clean the connector block on the outside and loosen
the hose connecting the motor and the block at the P3
port. Carefully start the fan. If oil exits from the block,
the non-return valve is leaking.
Try to clean the valve (it is preferable to let the valve
remain on the block). The valve is positioned between
P3 and the return line (between the motor port and
P1).
- Check the sensor operation. See "6.1.6 Inductive de-
tector" on page 112.
- Check whether the tooth wheel in the seed box is dam-
aged.
- Check whether the inductive detector is sufficiently
close to the rotating tooth wheel. Adjust if necessary.
27.06.2011
ver. 2