Position Sensor; Adjusting The Position Sensor - Valtra 6000 Workshop Manual

32. Electro---hydraulic power lift
3
Fig. 4. Position sensor
1. Locking nut
2. On threads sealant Permatex Super 300
3. Eccentric on lifting arm shaft
4. Power take ---off housing
5. Connector (at the rear on right side)
Note ! The position sensor must be changed if it
is damaged. If the sensor lead is damaged it can
be repaired using three pin connector.

Position sensor

The position sensor is mounted on the power take ---off hous-
ing at the rear of the tractor. It supplies information on the
actual position of the lower links. The sensor detects lower link
position by means of an eccentric fitted to the lift shaft.
The construction of the position sensor can be compared to
that of a solenoid. Inside the electromagnetic housing there
is a pin which moves with the eccentric on the lift shaft.
Alternating current is fed to the coil, and the voltage in the
middle of the coil depends on the position of the pin inside the
housing. Thus the voltage is proportional to the position of the
lower links.
U =6,3 ---7,7 V (AC) (4 ---7kHz)
SUPPLY eff
U =33 ---67 % x U
SIGNAL Supply
Measuring position sensor internal voltages,
see page 320/13.
A
(lower links down ---up)
15. 6. 1992
1. 8. 1998
4
2
U
SIGNAL
U
Supply
U
SIGNAL
U
Supply
View A

Adjusting the position sensor

Important! The lower links will rise a little higher when the
push buttons are used instead of the lift/lower switch or posi-
tion control knob (selector 4 in max upper position 9 (see fig-
ure 3)).
1. Lift the lower links to their highest level by using the push
buttons.
2. Unscrew the position sensor lock nut (1). Turn the position
sensor carefully by hand until it reaches the bottom. Then turn
the sensor back one turn
3. Lift the power lift to transport position with the limiter at its
maximum height (pos. 9) by using the lift/lower switch.
--- if the power lift does not go up to the position where the cyl-
inder stroke is 181 ---183 mm, loosen the position sensor.
--- if the power lift is raised too high, turn the position sensor
in the reverse direction and occasionally use the lift/lower
switch to lower the power lift.
Note! The sensor must not be put in the minimum position,
when the links are raised. Apply sealing compound Permatex
Super 300 to the threads (2) of the position sensor.
292
Model Code
6000-- 8750 320
5
1
10 mm
(max. 13
mm)
Page
6