Checking Radar, Gearbox, Rear Axle And Front Axle Speed Sensors; Changing Gearbox, Front Axle And Rear Axle Speed Sensors - Valtra 6000 Workshop Manual

35. Autocontrol IV
2. Checking and changing sensors
A. Checking radar, gearbox, rear axle and
front axle speed sensors
1. Drive the tractor onto the hard ground (free driving distance
about 50 m).
2. Select gear M2, disengage the diff. lock and 4WD (in
M ---position). Select the Delta PS highest ratio (in M ---position)
and adjust the engine revs to 1800 RPM with the hand throttle
lever.
3. Press the distance ---key two times and the display shows
text CAL DIST.
4. Drive the tractor straight ahead with the hand throttle lever.
5. Press SET ---key (display shows text DRIVE). Continue
driving until the display is switched off and then started again
(=successful calibration).
6. If the display shows text NO CALIB (=signal from the radar
too weak), carry out a new test---driving. If the calibration fails
again, check the radar and its wiring.
7. If the display shows:
--- ERROR GB=gearbox speed sensor damaged
--- ERROR FA = front axle speed sensor damaged
--- ERROR RW = rear wheel speed sensor damaged
In this case, check the sensor in question and also its mount-
ing and wiring according to instruction B.
8. After successful calibration, change display to the calibrat-
ing mode for the hidden functions (see page 340/6) and
continue driving straight ahead. Adjust the driving speed to
about 8---10 km/h.
9. Press once the SPEED ---key, and the display shows the
radar speed.
10. Press then twice the SPEED ---key and the display will
show the gearbox speed which should be the same as the
radar speed (±0,1 km/h).
11. Press once again the SPEED ---key and the display will
show the rear axle speed which should be the same as the
previous speeds (±0,1 km/h).
12. Press once again the SPEED ---key and the front axle
speed can be seen. It must be the same as the previous
speeds (±0,1 km/h).
13. Press the menu scanning key four times=radar speed.
Note! Do the same test according to paragraphs 9---13 but
drive this time at a speed of about 3 km/h. This method shows
if the impulse discs/measuring gear wheels are in perfect
condition.
Note! The calibrating mode can be left by switching off the
current.
1. 1. 1994
1. 1. 1995
B. Changing gearbox, front axle and rear
axle speed sensors
Note! The resistance of the speed sensors (not a radar) is
1,0 ---1,10 kΩ. The resistance can be measured from connec-
tor pins shown below. If the resistance is infinitive, measure
the resistance on the sensor pins to clear up possible breaks:
Pins of the rear axle speed sensor
A1C: 27 and 8.
X2C: 4 and 1
Sensor pins
Pins of the gearbox speed sensor:
A1C: 30 and 10.
X2C: 2 and 5
Sensor pins
Pins of the front axle speed sensor:
A1C: 29 and 9.
X2C: 11 and 8
Sensor pins
Changing rear axle speed sensor B1C
--- Remove the faulty sensor and clean the threads on the
tractor.
--- Seek with a dial gauge the shortest distance between the
sensor and the impulse disc through the sensor hole.
--- Apply Loctite 572 onto the threads and screw the sensor
by hand until the sensor touches the impulse disc (do not
screw too hard because the disc can be springy).
Unscrew the sensor then 1/4 of a turn.
--- Lock the sensor with a locking nut and connect wires
--- Calibrate and check the speed sensors according to
instruction A.
--- When the sensor functions, fit a plastic tube onto the sen-
sor leads. Connect the wires to the sensor and protect
shoes with grease UC1913 (vaseline spray HHS 2000
(Wyrth)). Move the tube onto the sensor and warm it until
it is pressed tightly round the sensor.
--- Fold the wire on the sensor and fasten it with a plastic
binder. Fasten the wire also to the lock washer under the
sensor locking nut, see picture above.
420
Model Code
6600E
351
8100E-- 8750E
:
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