Purpose, design and operation of the EFU
The device is designed to facilitate starting a cold engine at air temperatures down to -25 °C, quickly return the engine to normal temperature conditions and reduce smoke that occurs in a cold engine.
The power supply system (Fig. 1) serves to power consumers when the engine is running
The control and measuring instrument system (Fig. 1) is designed to monitor the operating mode of units and individual assembly units of the vehicle, as well as to determine the speed of movement
The light signaling system (Fig. 1) is designed to notify drivers of other vehicles about a turn (U-turn) or braking, as well as to signal the state of vehicle assembly units that affect traffic safety
The external and internal lighting system (Fig. 1) is designed to ensure vehicle safety, as well as illumination of the driver’s workplace
Analysis of failures in the power supply system
The main causes of failures in the power supply system are:
The engine starting system of a KamAZ vehicle can be in three alternative states: serviceable, operational and faulty (failure)
Analysis of circuit diagrams of lighting systems, light and sound alarms allows us to draw the following conclusions: - the circuits have general and private branches;
The heating and ventilation system is designed to maintain optimal temperature conditions in the cabin when the ambient temperature changes
The windshield cleaning system is designed to wash and clean windshields to ensure vehicle safety
The following pre-heater failures may occur on a KamAZ vehicle:
- - the electric motor of the pump unit does not work;
When the auxiliary brake valve button is pressed, the engine does not stop, the flaps in the exhaust pipes do not turn, the trailer does not brake
In this article we will consider the pneumatic drive of trailer brakes, i.e. the interaction and malfunctions of devices installed on the tractor and on the trailer
To diagnose the pneumatic drive of brake systems, you must have at least one control pressure gauge and use the control outlet valves available on the vehicle
On KamAZ-5320 vehicles, air enters the emergency brake release circuit (Fig. 1) with the engine running directly from the compressor through triple safety valve 13
As the compressor operates, the cylinder-piston group wears out and the tightness of the valves is compromised
Check the condition and operation of the platform lift limiting valve.
Fasten the lift limiting valve to the subframe crossmember bracket. The valve stem must not be bent.
The TEMS-1 “Vostok” tachograph is installed on the instrument panel and is designed to indicate and record vehicle operating parameters and driver operating modes (drivers during two-shift work)
During daily maintenance, we drain the condensate from the system receivers after the trip.
Condensate should be drained from the receivers at the nominal air pressure in the system, moving the drain cock rod to the side
Installing the cylinder block on the engine assembly stand
Assemble and prepare the piston group