Service Training
Section 2.6
Page 64
2.6.7.1.5 SENSORS IN THE CONTROL VALVE BLOCK
The sensors in the various valve sections work with plunger-type coils. Each sensor contains two identical
cylindrical coils. At the lower part of the control spool is a ferromagnetic anchor which moves in the cylindrical
coils when the control spool is moved. Both cylindric coils are connected in series and they are operated
with alternate current. The alternate current voltage is created by an internal circuit in the control valve block.
The sensors are supplied with 15 Volt at 2X1:8 by the electronic lift control unit. Battery negative is provided
for the sensors via terminal 2X1:6.
Output signals:
Neutral position of control spool 7.5 V
Extended control spool max. 3.75 V
Retracted control spool max. 11.25 V
Sensor 2B11, lifting output signal at 2X1:19 and 2X1:6
Sensor 2B12, tilting output signal at 2X1:16 and 2X1:6
Sensor 2B13, auxiliary hydraulics 1 output signal at 2X1:15 and 2X1:6
Sensor 2B14, auxiliary hydraulics 2 output signal at 2X1:14 and 2X1:6
These sensors work practically without any friction, and are contained in a tight casing, therefore preventing
dust and other foreign matter from entering. Meaning that these sensors have a long service life.
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