CONTROLS AND INSTRUMENTSControls an

CONTROLS AND INSTRUMENTS
Controls and instruments available inside the truck cab are illustrated in Figs 12 to 15.
Engage the gearbox, distributor box and differen tial lock, also the auxiliary power takeoff in compli ance with the instruction plates available inside the cab (Fig. 12), and according to the Section «Driving Technique».
The auxiliary power takeoff is guarded against self-shifting due to a retainer that locks the lever in the neutral position.
As button 22 (Fig. 13) is pressed, the auxiliary brake is actuated: when the foot is taken off the button, the braking action is interrupted. If parking brake lever 2 is shifted up, the truck becomes braked, and the trailer brake system is applied. If need be, the parking brake may be applied, when the truck goes, or it may be operated together with the wheel brakes.
Handle 4 controls atmospheric air supply. If lever 12 is set in the upper position, air is supplied through deflectors for blowing over safety glasses, in the lower position — for warming feet of the driver and passengers. If lever 13 is set in the upper position, the internal hatch is opened, and in the lower position, it is closed.
For shutting down the engine, pull handle 15 till it goes.
When switch! 8 handle is turned clockwise, right- turn indicators light up, if turned counter-clockwise — left-turn indicators glow.
When switch 24 button is pressed, the headlamps are changed over (distance healdlamps to dimming one and reverse).
If the truck is outfitted with a tyre centralized in-flation system, the cab has a relevant instruction plate giving the tyre pressure and travel speed depending on the kind of road.
The tyre pressure valve control lever may be set in three positions;
— left-hand — for inflating the tyres;
— middle — neutral, pressure gauge 11 (Fig. 14) indicates the actual air pressure in tyres;'
— right-hand — for bleeding air out of tyres.
The radiator shutter is controlled via chain 6 (see
Fig. 13). For lifting the shutter, pull the chain.
For connecting or disconnecting the truck storage batteries, depress button 23 (see Fig. 14) on the inst-rument board.
The engine starting preheater is controlled from the panel mounted under the hood on the radiator left-hand side. When the button of alarm signalling switch 17 is pressed, all direction indicators are turned for flashing, and the button check lamp glows.
When knob 19 is pulled, the engine crankshaft ro-tates at constant speed, and the knob is fixed when turned through 90°. Engine speed is checked through tachotneter 5. If the latter gives no reading, switch on any load (heater, instrument lighting, etc.), the
tachometer will begin to show the crankshaft speed.
The electrical system is checked through ammeter 8. Position of the pointer between marks «0» and «—» indicates storage battery discharge, that between «0» and «+» — charging. Air brake system pressure is checked through two-pointer pressure gauge /; to check air pressure, each pneumatic circuit has an outlet valve to connect a portable pressure gauge.
Starter and instrument switch 22 key may be set in three positions:
0 — vertical — the instruments and starter are off, the key may be taken out;
1 — middle (the key is turned right to the first locked position) — the instruments are on;
II — extreme right-hand (the key is turned right till stop) — for energizing the instruments and starter.
When switch 22 is on, oil pressure alarm drop lamp 2 glows (red colour). After the engine is started, when the crankshaft gains speed above the lowest value, the lamp goes out.
Illumination of the dial may be adjusted by turn¬ing the switch 24 knob.
The windshield wiper is switched on by turning switch 21 knob counter-clockwise. When the knob is turned further counter-clockwise, the brushes are so stimulated.
The glow-plug preheater operates if button 16 is held depressed continuously. When pilot lamp 8 (Fig. 15) lights, that indicates that the glow-plug preheater becomes ready for starting the engine.
When buttons 6, 7 are depressed, all the intact pilot lamps of the left- or right-hand unit glow. Pilot lamp 9 shows flickering green-colour light after the truck right- or, left-turn indicator has been switched on, also intended for checking the truck indicator lamps.
If the air pressure drops in reservoirs below 450 kPa (4.5 kgf/cm2), lamp 4 glows with red-colour light and the warning signal is heard.
If clearances between brake shoes and drums are widened, and also if the drive hydraulic part fails, when, the brake pedal is depressed lamp 3 glows with red-colour light and goes out after the fault is remedied.
If resistance in the oil filter rises (clogging of the filtering element, solidifying of oil at lower tempe-rature), lamp 5 glows with red light. Check that the lamp lights only when the engine is started or war¬med.
Coolant temperature alarm rise pilot lamp 2 glows with red-colour light, if the temperature rises above 98 °C. It is allowed to run the engine for a short time (during about two hours) at a temperatu¬re of up to 105 °C.
The actuation of the parking brake switches on red-colour pilot lamp 1.
Fuel level indicator 10 (see Fig. 14) shows the value of fuel level in the main fuel tank, Fuel reserve indicator 9 which is built into thé dial of indicator 10, and glows when the fuel volume diminishes to 60 ltr.
Oil cooler valve (Fig. 16) is mounted on the cen-trifugal oil filter casing.
Fan drive hydraulic coupling switch is mounted in the engine front on the branch pipe through which