Optional Warning and Indicator Lamps
A description of some commonly used optional warning and indicator lamps are listed below.
Air Filter Warning
The air filter warning indicator (AIR FILTER legend) illuminates when the air cleaner filter element is clogged, restricting the intake air flow below 25 inH 2 O.
If the air filter indicator is steadily illuminated for any period of time, check the air intake restriction gauge. If needed, replace the air filter, and reset the air intake restriction gauge.
Important: Never attempt to clean the air filter.
Check Transmission Warning
Note: Although it appears in the row of optional indicators, the check transmission indicator is a standard indicator.
The check transmission indicator, shown in Fig., notifies the driver of three things. Any of the following items could be the cause for activating the indicator:
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the oil needs to be changed
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the filter[s] need to be changed
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clutch maintenance is required
When the check transmission indicator illuminates, refer to the Allison Operator's Manual or contact customer support at Allison Transmission to determine the specific cause activating the indicator.
Fig. 1, Check Transmission Indicator
Low Fuel Pressure Warning
The low fuel pressure warning indicator, shown in Fig., notifies the driver that the CNG fuel cylinders need to be refilled.
When the low fuel pressure indicator illuminates, there is less than 1/8th fuel capacity, which is approximately 260 psi (1793 kPa) in the fuel cylinders.
