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MAZ 631236 - CONTROLS AND INSTRUMENTATION

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CONTROLS AND INSTRUMENTATION
The arrangement of controls and instrumentation is shown on Figures 5, 6, 7.
Parking and emergency brakes drive valve handle
Is located to the right from the steering column under the dashboard. The handle can be fixed
in two extreme positions. In the lower extreme fixed position parking brake is engaged, and it is
disengaged when the handle is moved to the top fixed position. When keeping the handle in any
intermediate (non-fixed) position, emergency brake is engaged.
When pushing the handle end in the extreme lower position and auxiliary moving downwards,
unbraking of the semitrailer and the check of the road train keeping on a slope by means of truck
brakes takes place.
Emergency brakes drive valve button
Is located on the cab floor to the left from the driver.
When the button is pressed butterfly valve creates counterpressure in the exhaust system by
blocking the flow passage in the exhaust gases manifold. At the same time fuel feed cuts off.
Steering wheel with an energy-absorbing steering column and a device that allows its height
and inclination adjustment.
Adjustments are carried out by pressing the pedal that is located on the steering column
fastening bracket. After placing the steering wheel into a comfortable position, release the pedal.
Starter and steering column instruments switch-lock with an antitheft device. The key is
inserted and taken out of the lock in position III (Figure 5).
In order to unlock the steering column shaft it is necessary to insert the key into the switch-lock
and, in order to avoid key braking, turn the steering wheel to the left – to the right a bit, and then
turn the key clockwise to the position «0».
When taking the key out of the switch-lock (from position III) the lock blocking device is
disabled. In order to block the steering column shaft it is necessary to turn the steering wheel to the
left – to the right a bit.
Other positions of the key in the lock:
0 – neutral (fixed) position. Instruments and starter circuits are switched off, the engine is shut
down;
I – instruments and consumers are powered up (fixed position);
II – instruments, consumers and starter circuits are powered off (non-fixed position).
Handle 3 of the windscreen wiper switch is located on the steering wheel, on the right-hand
side. There are following positions:
In the horizontal plane:
0 – neutral (fixed);
I (fixed) – windscreen wiper is engaged on a low speed;
II (fixed) – windscreen wiper is engaged on a high speed;
III (fixed) – windscreen wiper is engaged in intermitted duty regime.
In the vertical plane:
IV (non-fixed) – windscreen washer is engaged with a simultaneous switching on of the
windscreen wiper on a low speed.
When pressing the handle end, pneumatic sound alarm is switched on at any position of the
handle.
Handle 2 of the turn indicator, lower beam and upper beam switch is located on the steering
column, at the left-hand side. There are following positions:
In the horizontal plane:
0 – neutral (fixed);