OPERATION 3.2 CONSTRUCTION OF THE SHOVEL (1) Final drive, hub type travel gear (2) Crawler carrier (3) Track roller (4) Carrier roller (5) Guide wheel (6) Swing circle guard (7) Hydraulically operated access ladder, see page 46 for more information (8) Hydraulic cylinder for access ladder (9) Control switch for access ladder (10) Battery main switches (11) Emergency engine shut down switch and manual actuator switch for the fire sup- pression system, if so equipped. Never stop the engines from a full load except in case of emergency.
If a hot engine is shut down without previous idling period of three to five minutes, the temperature in certain engine parts rising sharply after the cool- ing system ceases to function. The resulting thermal stress, especially in the turbochargers, may cause serious damage.
(12) Radiator of rear engine, designation number 1 (13) Radiator of front engine, designation number 2 (14) Sliding window of operator’s cab, see page 54 for more information (15) Emergency escape ladder (16) Exhaust muffler (17) Engine air cleaners (18) Hydraulically driven grease pump of the Swing circle pinion Lubrication System (SLS) (19) Hydraulically driven grease pump of the Central Lubrication System (CLS) (20) Counterweight The chambers of the counterweight are filled with a mixture of concrete, gran- ulated ore and steel pellets. This mixture can create explosive gases which will accumulate in the chambers of the counterweight.
Before any welding, flame-cutting, grinding or drilling procedures are carried out on the counter- weight it is vital to expel these gases from the counterweight chambers. Fail- ure to properly expel the gases from the counterweight chambers can result in an explosion with serious personal injury or death. Follow the instructions given in PARTS & SERVICE NEWS No. AH04518 for expelling the gases from the counterweight chambers. 41 CAUTION WARNING