75
2. Check daily after turning engine on:
2.1 Check engine oil pressure
Run the engine.
The information on engine oil pressure can be requested through the driver information digital display.
If the oil pressure is too low, the oil pressure is automatically shown on the combination instrument.
Indication of the oil gauge will show a high value after the cold start of the engine and then it should be kept
within the range of 0.3-0.5Mpa (3- 5kg/cm
2
) along with the increment of the oil temperature as well as the
normal engine speed.
2.2 Check pneumatic pressure
The air pressure gauge indicates the reserve pressure individually for the front and rear service brake circuits.
The reserve air pressure in each brake circuit must be sufficient for the correct operation of the brake system.
The STOP warning light comes on in case of low brake pressure in the service brake or parking brake circuits.
Attention!
If the driver information indicator displays the warning “brake pressure” and the STOP warning light comes
on with the engine running, it will be an indication that the air pressure is excessively low. Do not drive the
vehicle if the air pressure gauge displays low air pressure in one or both brake circuits, as the service brake
could fail resulting in serious accident.
2.3 Check tachometer working order
Indications on tachometer scale:
a. Green zone---operating range of maximum performance
b. Yellow zone---low yield and high consumption areas
c. Red zone---engine overspeed range (risk of immediate engine
damage)
Always observe tachometer while driving the vehicle. Whenever
possible keep engine running within the economical range. On
downgrade, select an adequate gearbox speed and monitor vehicle
speed to avoid engine operating in the danger range (red zone). When the exhaust-brake is operating on down
grades, select an adequate gearbox speed to keep engine speed within efficient exhaust-brake
operation(yellow).
Always avoid engine over revving (red zone), as engine operation in this speed range can end up in immediate
engine damage or seriously jeopardize its durability.
The yellow range with red reticle can be used occasionally when the exhaust-brake needs to be used at its
efficiency limit, however, at risk of engine durability. Therefore, do not operate in this range in a normal or
usual way.
