OPERATION 3.7 ELECTRICAL EQUIPMENT IN CAB BASE Preheating System for Oil, Coolant and Batteries General The preheating system is a special equipment and can be installed in the factory or locally at site. Power supply to the pre- heating system must be provided through an external power source. The following description applies to a typical preheating equip- ment as it is delivered ex works. The following systems are equipped with heaters:
G Engine cooling system G Engine lubricating system G Hydraulic system (main and suction oil reservoir) G PTO’s (pump distributor gears) G Storage batteries REMARK The auxiliary heater unit in the cab base and the battery charger are also connected to the external power source. Legend for illustration Z 21754 (1) Main switch board (1X1) for the preheating system, located in the cab base (2) Main switch (1Q1) for all system heaters (3) Circuit breakers(1F-1, 1F-2 ...), refer to the electrical diagram for determination of the protected circuits.
(4) Heater unit for cab base (5) Battery charger (E55) (6) Key switch (S153) for battery charger G Be sure to switch off main switch (2) and to disconnect power supply cable before working on any part of the heating system. G DO NOT connect power supply cable when the engines are running. The heating system must not be activated with the engines running Use the heating system during stand-still periods e.g. over night and low ambient temperatures. The heating system should be energized as soon as the engines are shut down. This allows the heating system to maintain the desired temperature with the use of minimum power. 199 WARNING