1.8. Indicator Diagnostics and Troubleshooting
1. The diagnostics of the faults according to items 1-3 and 5 is similar to that of the
tachospeedometer;
2. Over- or understated readings of the engine rotational speed and PTO’s rota-
tional speed (with the normal movement of the pointer):
Check the correctness of programming the instrument according to the gear ratio of the
alternator drive (parameter “K2”): (see item 1.7);
3. Over- or understated readings of the tractor speed:
1. Check the correctness of programming the instrument according to the rolling radius of
the rear wheels (R) (see item 1.7);
2. Check the correctness of programming according to the number of teeth of the half-
axle pinion (Z1) (see item 1.7);
3. Check the correctness of programming of the gear rate of the wheel reduction gear
(K1) (see item 1.7).
4. No readings of the tractor motion speed:
Check the presence of the signals from the both speed sensors (BV1, BV2).
5. Signalling of operation of the speed sensor in case of absence of a signal from
one of them:
a) in case of absence of the signal from the right wheel speed sensor (BV1), the symbol
“□” is displayed on the right of the digital indicator within 12 s after starting the motion;
check the connection and serviceability of the right wheel speed sensor;
b) in case of absence of the signal from the left wheel speed sensor (BV2), the symbol
“□” is displayed on the left of the digital indicator within 12 s after starting the motion;
check the connection and serviceability of the left wheel speed sensor.
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