OM2228 Safety - Section 22 Warnings and Cautions Page 22-5 The parking brake is spring-applied and hydraulically released. It is designed to hold a stationary truck when the engine is off. The truck must be completely stopped before applying the parking brake, or dam- age may occur to the parking brake. To apply the parking brake, press the rocker switch toward the ON symbol. To release the parking brake, press the rocker switch toward the OFF symbol. When the key switch is ON and the parking brake switch is applied, parking brake indicator light (A3, overhead panel) will be illuminated. Before arc welding on the truck, disconnect the posi- tive and negative battery cables of the vehicle.
Fail- ure to do so may seriously damage the battery and electrical equipment. Disconnect the battery charging alternator lead wire and isolate the electronic control components before welding. It is not necessary to disconnect or remove any control circuit cards or any of the Alarm Indicating Device (AID) circuit control cards. Fasten the welding machine ground (-) lead to the piece being welded. The grounding clamp must be attached as near as possible to the weld area. DO NOT allow welding current to pass through the ball bearings, roller bearings, suspensions, or hydraulic cylinders. DO NOT lay welding cables over or near the vehicle electrical harnesses.
The welding voltage could be induced into the electrical harness and pos- sibly cause damage to the components. NOTE: DO NOT use the parking brake when loading or dumping. With the key switch ON and the engine on, sudden shock caused by loading or dumping could cause the system’s motion sensor to release the parking brake. The brake lock switch is for holding the truck while parked at the shovel during loading or while dump- ing. It applies the rear service brakes only. If the brake pedal malfunctions while the truck is in motion, apply the brake lock to stop the truck. DO NOT use this brake as a parking brake when leaving the truck.
With the engine off, the hydraulic system will depres- surize, releasing the service brakes. This plate is mounted on the top side of the blown grid housings. Stepping or standing here may result in serious personal injury. High voltage danger plates and caution plates are attached to the doors of the electrical control cabinet. The high voltage plate is also attached to the blown grid housing, extended range housing, rectifier hous- ing, inlet duct, and rear hatch cover.