• When the tractor is moving, the display (7) shows the tractor speed indication (6)
(km/h), while the indication (5) disappears. The electric signal of the speed comes from
the speed sensors mounted on the rear axle cover (BV1, BV2). The speed readings are
taken through a signal from the sensor mounted on the pinion of the final drive of the
wheel rotating at lesser speed. The calculated speed is higher than the actual one, be-
cause no tractor skid is the taken into account;
• On starting the engine, the pointer indicator (8) moves round the index dial (1) to display
the rotational speed of the engine crankshaft. At the same time, the display (4) shows the
PTO indication (rpm). The scale (3) is assigned to the PTO I and the scale (2) – to the
PTO II. The electric signal of the rotational speed is taken from the phase winding of the
alternator.
1.2. Tachospeedometer control board (Fig. 2)
The control board is installed in the dashboard and serves for programming the
tachospeedometer to the specific model of the MTZ tractor.
Fig. 2. Control board (А3):
1 – Button for setting the tachospeedometer to the programming mode and selecting the
programming parameter on the tachospeedometer display (7). 2 – Button for selecting
the value of the coded parameter shown on the display (7)
1.3. Programming the tachospeedometer АР70.3813
ATTENTION! The tachospeedometer has been programmed just to your tractor make at
the factory. Re-programming is required in case of tyre type changing. Do not re-program
the tachospeedometer, if unnecessary.
The tachospeedometer shall be programmed to ensure the correct display of the follow-
ing tractor’s parameters: engine rotational speed, tractor motion speed and PTO rota-
tional speed (540 and 1000 rpm).
Programming procedure:
– Remove the control board cover;
– Press the button (1) to enter the programming mode (Fig. 2).
1. To ensure the correct display of the tractor motion speed, it is necessary to program
the tachospeedometer to the number of teeth of the pinion at the place of installation of
the speed sensors (parameter “Z”) and rear wheel rolling radius (parameter “R”). To do
this:
– press the button (1) of the board and call the parameters “Z” and “R” in turn to the dis-
play (3) of the tachospeedometer (4);
– press the button (2) of the board and set the number of teeth (Z) according to Table 1
and value Rk according to Table 2:
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