OM3017.3 Operation - Section 3 Instrument Panel and Indicator Lights Page 3-17 INSTRUMENTS AND INDICATORS INSTRUMENT PANEL (1, Figure 3-7) KEY SWITCH The operator must understand the function and opera- tion of each instrument and control. Many control functions are now identified with ISO ("International") symbols that the operator should learn to recognize immediately. This knowledge is essential for proper and safe operation of the truck. Items that are marked OPTIONAL do not apply to every truck. The following symbols are general indicators and may appear in multiple locations and combinations on the instrument panel. The key switch is a three position (Off, Run, Start) switch.
When switch is rotated one position clockwise, it is in the "Run" position and all electrical circuits (except "Start") are activated. To start engine, move Selector Switch to "Neutral", then rotate keyswitch fully clockwise to the "Start" position and hold this position until engine starts. "Start" position is spring-loaded to return to "Run" when key is released. NOTE: If truck is equipped with the Cummins Engine Prelube System, a noticeable time delay will occur (while engine lube oil passages are being filled) be- fore starter engagement and engine cranking will be- gin (See NOTE: in Operating Instructions). "OFF" This symbol may be used alone or with another symbol.
This symbol identifies the "Off" position of a switch or control. "ON" This symbol may be used alone or with another symbol. This symbol identifies the "On" position of a switch or control. With truck stopped, turn keyswitch counterclockwise to "Off" for normal shutdown of engines equipped with Detroit Diesel electronic engine controls ("DDEC"), or Cummins Centry Fuel Control. If engine does not shutdown with keyswitch, use center console- mounted engine shutdown (see Operator Controls). Refer to "Operating Instructions" in next section, for more specific details. "IN" This symbol identifies the "Pushed- In" position of a push-pull switch or control. NOTE:
A switch is located at lower left front of truck for ground level engine shutdown. "OUT" (2, Figure 3-7) ENGINE SHUTDOWN (OPTIONAL) This symbol identifies the "Pulled- Out" position of a push-pull switch or control. If installed, this OPTIONAL Emer- gency Engine Shutdown button must be depressed and held until engine stops. See "Operator Controls and Equipment" section for normal engine shutdown location. "NO" This symbol when it appears on an indicator or control identifies that this indicator or control is NOT used.