OPERATION 3.3 OPERATOR’S CAB - CONTROLS Switch Board Legend for illust. Z25353 (18) Switch, cab ventilation blower. Blower runs with low speed, even with switch in -0- position. (Cab pres- surizing prevents ingress of dust). (19) Switch, mirror heating (20) Enable switch for hydraulic service arm operation. Set this switch to ON position before lowering the service arm. With this switch in ON position, the pilot control system is made inoperative and the hydraulic swing brake is applied. After completion of replen- ishment procedure, swing back the service arm to its home position and set switch (26) to OFF position.
(21) Toggle switch, swing parking brake 0 - Parking brake released - UP 1 - Parking brake applied - DOWN. The parking brake should only be applied with superstruc- ture at complete standstill, except in case of emergency. Refer to page 252 for more information. (22) Switch, manual actuation of swing ring gear pinion lubrication system (23) Switch, manual actuation of central lubrication sys- tem (24) Switch for upper and lower windshield wiper 0 - Off 1 - Interval stage 2 - Slow stage 3 - Fast stage (25) Switch, windshield washer (26) Key operated main switch (27) Acoustic warning signal This signal sounds for approximately 1 second when a fault message appears on the ECS screen.
In case of too low hydraulic oil level this signal sounds continuously. Shut down the Shovel, locate and correct the cause immediately. Fill up hydraulic oil to the correct level. For the correct checking procedure See "CHECKS BEFORE STARTING THE ENGINES" on page 230. 85 CAUTION CAUTION CAUTION CAUTION